IEA / Infrastructure and Energy Alternatives Inc - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Infrastructure and Energy Alternatives Inc
US ˙ NASDAQ ˙ US45686J1043
HINDI NA ACTIVE ANG SIMBONG ITO

Mga Batayang Estadistika
LEI 549300CZ3FQ7JWXZHD54
CIK 1652362
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Infrastructure and Energy Alternatives Inc
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
November 1, 2022 15-12G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13

15-12G 1 tm2229421d11512g.htm 15-12G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number 001-37796 INFRASTRUCTURE AND ENERGY ALT

October 11, 2022 S-8 POS

As filed with the Securities and Exchange Commission on October 11, 2022.

As filed with the Securities and Exchange Commission on October 11, 2022. Registration No. 333-256215 Registration No. 333-235480 Registration No. 333-231924 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO: FORM S-8 REGISTRATION STATEMENT NO. 333-256215 FORM S-8 REGISTRATION STATEMENT NO. 333-235480 FORM S-8 REGISTRATION STATEMENT NO. 333-2

October 11, 2022 POS AM

As filed with the Securities and Exchange Commission on October 11, 2022.

As filed with the Securities and Exchange Commission on October 11, 2022. Registration No. 333-260876 Registration No. 333-255097 Registration No. 333-251148 Registration No. 333-235280 Registration No. 333-224337 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO: FORM S-3 REGISTRATION STATEMENT NO. 333-260876 FORM S-3 REGISTRATION STATEMENT

October 11, 2022 POS AM

As filed with the Securities and Exchange Commission on October 11, 2022.

As filed with the Securities and Exchange Commission on October 11, 2022. Registration No. 333-260876 Registration No. 333-255097 Registration No. 333-251148 Registration No. 333-235280 Registration No. 333-224337 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO: FORM S-3 REGISTRATION STATEMENT NO. 333-260876 FORM S-3 REGISTRATION STATEMENT

October 11, 2022 SC 13D/A

IEA / Infrastructure & Energy Alternatives Inc / ARES MANAGEMENT LLC - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 15)* INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Alison S. Ressler, Esq. Rita-Anne O’Neill, Esq. Sullivan & Cromwell LLP 1888 Century Park East, Suite 2

October 11, 2022 S-8 POS

As filed with the Securities and Exchange Commission on October 11, 2022.

As filed with the Securities and Exchange Commission on October 11, 2022. Registration No. 333-256215 Registration No. 333-235480 Registration No. 333-231924 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO: FORM S-8 REGISTRATION STATEMENT NO. 333-256215 FORM S-8 REGISTRATION STATEMENT NO. 333-235480 FORM S-8 REGISTRATION STATEMENT NO. 333-2

October 11, 2022 POS AM

As filed with the Securities and Exchange Commission on October 11, 2022.

As filed with the Securities and Exchange Commission on October 11, 2022. Registration No. 333-260876 Registration No. 333-255097 Registration No. 333-251148 Registration No. 333-235280 Registration No. 333-224337 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO: FORM S-3 REGISTRATION STATEMENT NO. 333-260876 FORM S-3 REGISTRATION STATEMENT

October 11, 2022 POS AM

As filed with the Securities and Exchange Commission on October 11, 2022.

As filed with the Securities and Exchange Commission on October 11, 2022. Registration No. 333-260876 Registration No. 333-255097 Registration No. 333-251148 Registration No. 333-235280 Registration No. 333-224337 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO: FORM S-3 REGISTRATION STATEMENT NO. 333-260876 FORM S-3 REGISTRATION STATEMENT

October 11, 2022 S-8 POS

As filed with the Securities and Exchange Commission on October 11, 2022.

As filed with the Securities and Exchange Commission on October 11, 2022. Registration No. 333-256215 Registration No. 333-235480 Registration No. 333-231924 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO: FORM S-8 REGISTRATION STATEMENT NO. 333-256215 FORM S-8 REGISTRATION STATEMENT NO. 333-235480 FORM S-8 REGISTRATION STATEMENT NO. 333-2

October 11, 2022 POS AM

As filed with the Securities and Exchange Commission on October 11, 2022.

As filed with the Securities and Exchange Commission on October 11, 2022. Registration No. 333-260876 Registration No. 333-255097 Registration No. 333-251148 Registration No. 333-235280 Registration No. 333-224337 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO: FORM S-3 REGISTRATION STATEMENT NO. 333-260876 FORM S-3 REGISTRATION STATEMENT

October 11, 2022 EX-99.15

JOINT FILING AGREEMENT

EXHIBIT 99.15 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the comm

October 7, 2022 EX-3.1

Amended and Restated Certificate of Incorporation of Infrastructure and Energy Alternatives, Inc.

Exhibit 3.1 FOURTH AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. FIRST: The name of the corporation is Infrastructure and Energy Alternatives, Inc. (the ?Corporation?). SECOND: The address of the Corporation?s registered office in the State of Delaware is Corporation Trust Center, 1209 Orange Street in the City of Wilmington, County of New Castle

October 7, 2022 EX-3.2

Amended and Restarted Bylaws of Infrastructure and Energy Alternatives, Inc.

Exhibit 3.2 AMENDED AND RESTATED BYLAWS OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, Inc. (a Delaware corporation) ARTICLE I Offices SECTION 1.??????Registered Office. The registered office of the Corporation within the State of Delaware shall be The Corporation Trust Company, Corporation Trust Center, 1209 Orange Street, Wilmington, New Castle County, Delaware 19801. SECTION 2.??????Other Offices.

October 7, 2022 8-K

Changes in Control of Registrant, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Termination of a Material Definitive Agreement, Material Modification to Rights of Security Holders, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): October 7, 2022 INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorpora

October 7, 2022 EX-99.1

Re: SPAC Warrants

Exhibit 99.1 VIA CERTIFIED MAIL Continental Stock Transfer & Trust Company 1 State Street, 30th Floor New York, NY 10004 Attention: Compliance Department Re: SPAC Warrants Ladies and Gentlemen: Reference is made to (a) the Amended and Restated Warrant Agreement, dated as of March 26, 2018, by and between Infrastructure and Energy Alternatives, Inc., a Delaware corporation (f/k/a M III Acquisition

September 30, 2022 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 30, 2022 Infrastructure & Energy Alternatives, Inc.

September 30, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

September 26, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 26, 2022 MASTEC, INC. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 26, 2022 MASTEC, INC. (Exact Name of Registrant as Specified in Its Charter) Florida 001-08106 65-0829355 (State or Other Jurisdiction of Incorporation) (Commission File Num

September 12, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 12, 2022 MASTEC, INC. (

425 1 d335392d425.htm 425 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 12, 2022 MASTEC, INC. (Exact Name of Registrant as Specified in Its Charter) Florida 001-08106 65-0829355 (State or Other Jurisdiction of Incorpora

September 8, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

September 6, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 6, 2022 MASTEC, INC. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 6, 2022 MASTEC, INC. (Exact Name of Registrant as Specified in Its Charter) Florida 001-08106 65-0829355 (State or Other Jurisdiction of Incorporation) (Commission File Numb

September 2, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 2, 2022 MASTEC, INC. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 2, 2022 MASTEC, INC. (Exact Name of Registrant as Specified in Its Charter) Florida 001-08106 65-0829355 (State or Other Jurisdiction of Incorporation) (Commission File Numb

September 1, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 1, 2022 MASTEC, INC. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 1, 2022 MASTEC, INC. (Exact Name of Registrant as Specified in Its Charter) Florida 001-08106 65-0829355 (State or Other Jurisdiction of Incorporation) (Commission File Numb

August 25, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 25, 2022 MASTEC, INC. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 25, 2022 MASTEC, INC. (Exact Name of Registrant as Specified in Its Charter) Florida 001-08106 65-0829355 (State or Other Jurisdiction of Incorporation) (Commission File Number

August 22, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 22, 2022 MASTEC, INC. (Exa

425 1 d409086d425.htm 425 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 22, 2022 MASTEC, INC. (Exact Name of Registrant as Specified in Its Charter) Florida 001-08106 65-0829355 (State or Other Jurisdiction of Incorporatio

August 10, 2022 425

Filed by MasTec, Inc.

Filed by MasTec, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject company: Infrastructure and Energy Alternatives, Inc. Commission File No. 001-37796 Company: MasTec, Inc. Conference Title: 8th Annual Cowen Communications Infrastructure Summit Moderator: Marc Bianchi Date: Tuesday, 9th August 2022 Conference time: Approximately 10:45 Speaker 1 - Marc Bianchi From MasTec, we have

August 8, 2022 425

Filed by MasTec, Inc.

Filed by MasTec, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject company: Infrastructure and Energy Alternatives, Inc. Commission File No. 001-37796 Company: MasTec, Inc. Conference Title: MasTec, Inc. (MTZ) Q2 2022 Earnings Call Moderator: Marc Lewis Date: Friday, 5th August 2022 Conference time: 09:00 Operator: Good morning, and welcome to MasTec?s Second Quarter 2022 Earnings

August 8, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 8, 2022 MASTEC, INC. (Exac

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 8, 2022 MASTEC, INC. (Exact Name of Registrant as Specified in Its Charter) Florida 001-08106 65-0829355 (State or Other Jurisdiction of Incorporation) (Commission File Number)

August 5, 2022 425

MasTec Announces Second Quarter 2022 Financial Results Confirming Annual 2022 Guidance with Record Backlog

425 1 d368609d425.htm 425 Filed by MasTec, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject company: Infrastructure and Energy Alternatives, Inc. Commission File No. 001-37796 Contact: J. Marc Lewis, Vice President-Investor Relations 305-406-1815 [email protected] 800 S. Douglas Road, 12th Floor Coral Gables, Florida 33134 Tel: 305-599-1800 www.mastec.com For Immediate Releas

August 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED June 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 001-37796 Infrastructure & Energy Alternatives, Inc. (Exact name

August 4, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 4, 2022 Infrastructure & Energy Alternatives, Inc. (Exact name of registrant as specified in its charter) Delaware 001-37796 47-4787177 (State or other jurisdiction of incorpor

August 4, 2022 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES ANNOUNCES SECOND QUARTER 2022 RESULTS

INFRASTRUCTURE AND ENERGY ALTERNATIVES ANNOUNCES SECOND QUARTER 2022 RESULTS INDIANAPOLIS, August 4, 2022 ? Infrastructure and Energy Alternatives, Inc.

July 27, 2022 425

1

425 1 d364895d425.htm 425 Filed by MasTec, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject company: Infrastructure and Energy Alternatives, Inc. Commission File No. 001-37796 Company: MasTec, Inc. Conference Title: Infrastructure & Energy Alternative acquisition conference call Moderator: Marc Lewis Date: Monday, 25th July 2022 Conference Time: 08:30 (UTC-05:00) Operator: Good d

July 26, 2022 425

1

Filed by MasTec, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject company: Infrastructure and Energy Alternatives, Inc. Commission File No. 001-37796 Company: MasTec, Inc. Conference Title: Infrastructure & Energy Alternative acquisition conference call Moderator: Marc Lewis Date: Monday, 25th July 2022 Conference Time: 08:30 (UTC-05:00) Operator: Good day, everyone. Welcome to M

July 26, 2022 EX-5.30

Voting and Support Agreement

EX-5.30 2 tm2221790d1ex5-30.htm EXHIBIT 5.30 Exhibit 5.30 VOTING AND SUPPORT AGREEMENT Final Form This VOTING AND SUPPORT AGREEMENT (this “Agreement”) dated as of July 24, 2022, is entered into by and among MasTec, Inc., a Florida corporation (“Parent”) and the undersigned stockholders (each, a “Stockholder” and collectively, the “Stockholders”) of Infrastructure and Energy Alternatives, Inc., a D

July 26, 2022 EX-99.14

Joint Filing Agreement, dated as of July 26, 2022, by and among the Reporting Persons.

EXHIBIT 99.14 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the comm

July 26, 2022 SC 13D/A

IEA / Infrastructure & Energy Alternatives Inc / ARES MANAGEMENT LLC - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 14)* INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Alison S. Ressler, Esq. Rita-Anne O’Neill, Esq. Sullivan & Cromwell LLP 1888 Century Park East, Suite 2

July 25, 2022 EX-99.1

MasTec to Acquire Infrastructure and Energy Alternatives, Inc. (“IEA”), a Premier Renewable Energy and Infrastructure Services Provider

Exhibit 99.1 Contact: 800 S. Douglas Road, 12th Floor J. Marc Lewis, Vice President-Investor Relations Coral Gables, Florida 33134 305-406-1815 Tel: 305-599-1800 [email protected] www.MasTec.com Aaron Reddington, CFA, VP of Investor Relations and Corporate Development (765) 828-2653 [email protected] For Immediate Release MasTec to Acquire Infrastructure and Energy Alternatives, Inc. (?IEA?),

July 25, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 24, 2022 INFRASTRUCTURE AND

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 24, 2022 INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporati

July 25, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 24, 2022 MASTEC, INC. (Exact

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 24, 2022 MASTEC, INC. (Exact Name of Registrant as Specified in Charter) Florida 001-08106 65-0829355 (State or Other Jurisdiction of Incorporation) (Commission File Number) (I.R

July 25, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

July 25, 2022 425

Strategic Acquisition of Infrastructure and Energy Alternatives, Inc. (“IEA”) July 25, 2022 Filed by MasTec, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject company: Infrastructure and Energy Alternatives, Inc. Commission File No.

Strategic Acquisition of Infrastructure and Energy Alternatives, Inc. (?IEA?) July 25, 2022 Filed by MasTec, Inc. pursuant to Rule 425 under the Securities Act of 1933 Subject company: Infrastructure and Energy Alternatives, Inc. Commission File No. 001-37796 IEA Acquisition Strategic Benefits Expands MasTec?s presence in the attractive Renewable Power Generation market Adds Renewable Power capabi

July 25, 2022 EX-2.1

Agreement and Plan of Merger, dated as of July 24, 2022, by and among Infrastructure and Energy Alternatives, Inc., MasTec, Inc. and Indigo Acquisition I Corp.

Exhibit 2.1 EXECUTION VERSION AGREEMENT AND PLAN OF MERGER among MASTEC, INC. Indigo Acquisition I Corp. and Infrastructure and Energy Alternatives, Inc. Dated as of July 24, 2022 i TABLE OF CONTENTS Page Article I THE MERGER 2 Section 1.1 The Merger 2 Section 1.2 Closing 2 Section 1.3 Effective Time 2 Section 1.4 Effects of the Merger 2 Section 1.5 Certificate of Incorporation; Bylaws 3 Section 1

July 25, 2022 8-K

Financial Statements and Exhibits, Other Events, Entry into a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 24, 2022 INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporati

July 25, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

July 25, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

May 9, 2022 EX-3.2

Second Amended and Restated By Laws of Infrastructure and Energy Alternatives, Inc., effective May 5, 2022.

SECOND AMENDED AND RESTATED BY LAWS OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC.

May 9, 2022 EX-99.2

© 2022. IEA. All Rights Reserved. INVESTOR PRESENTATION MAY 2022 © 2022. IEA. All Rights Reserved. 2 This presentation contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Ac

? 2022. IEA. All Rights Reserved. INVESTOR PRESENTATION MAY 2022 ? 2022. IEA. All Rights Reserved. 2 This presentation contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the ?Securities Act?) and Section 21E of the Securities Exchange Act of 1934, as amended (the ?Exchange Act?). The forward-looking statements can be identified by the u

May 9, 2022 EX-3.5

Certificate of Elimination of the Series B-2 Preferred Stock of Infrastructure and Energy Alternatives, Inc., effective May 5, 2022.

CERTIFICATE OF ELIMINATION OF THE SERIES B-2 PREFERRED STOCK OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC.

May 9, 2022 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES ANNOUNCES FIRST QUARTER 2022 RESULTS

INFRASTRUCTURE AND ENERGY ALTERNATIVES ANNOUNCES FIRST QUARTER 2022 RESULTS INDIANAPOLIS, May 9, 2022 ? Infrastructure and Energy Alternatives, Inc.

May 9, 2022 EX-3.4

Certificate of Elimination of the Series B-1 Preferred Stock of Infrastructure and Energy Alternatives, Inc., effective May 5, 2022.

CERTIFICATE OF ELIMINATION OF THE SERIES B-1 PREFERRED STOCK OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC.

May 9, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number: 001-37796 Infrastructure & Energy Alternatives, Inc. (Exact name

May 9, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 9, 2022 Infrastructure & Energy Alternatives, Inc. (Exact name of registrant as specified in its charter) Delaware 001-37796 47-4787177 (State or other jurisdiction of incorporati

May 9, 2022 EX-3.1

Third Amended and Restated Certificate of Incorporation of Infrastructure and Energy Alternatives, Inc., effective May 5, 2022.

SECONDTHIRD AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC.

May 9, 2022 EX-3.3

Certificate of Elimination of the Series A Preferred Stock of Infrastructure and Energy Alternatives, Inc., effective May 5, 2022.

CERTIFICATE OF ELIMINATION OF THE SERIES A PREFERRED STOCK OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC.

May 9, 2022 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 5, 2022 Infrastructure & Energy Alternatives, Inc. (Exact name of registrant as specified in its charter) Delaware 001-37796 47-4787177 (State or other jurisdiction of incorporati

May 9, 2022 EX-3.6

Certificate of Elimination of the Series B-3 Preferred Stock of Infrastructure and Energy Alternatives, Inc., effective May 5, 2022.

CERTIFICATE OF ELIMINATION OF THE SERIES B-3 PREFERRED STOCK OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC.

March 23, 2022 DEF 14A

Definitive Proxy Statement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

March 23, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ý Filed by a Party other than the Registrant ☐ C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive

March 9, 2022 PRER14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ý Filed by a Party other than the Registrant ☐ Check the app

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

March 8, 2022 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ý Filed by a Party other than the Registrant ☐ Check the app

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

March 7, 2022 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES ANNOUNCES FOURTH QUARTER AND FULL YEAR 2021 RESULTS

INFRASTRUCTURE AND ENERGY ALTERNATIVES ANNOUNCES FOURTH QUARTER AND FULL YEAR 2021 RESULTS INDIANAPOLIS, March 7, 2022 ? Infrastructure and Energy Alternatives, Inc.

March 7, 2022 EX-21.1

List of Subsidiaries of the Registrant.

Infrastructure and Energy Alternatives, Inc. Subsidiaries December 31, 2021 Subsidiary Jurisdiction of Formation Former Name or Alias Infrastructure and Energy Alternatives, Inc. Delaware M III Acquisition Corp. IEA Intermediate Holdco, LLC Delaware IEA Energy Services, LLC Delaware IEA Management Services, Inc. Delaware IEA Equipment Management, LLC Delaware IEA Equipment Management, Inc. Bianchi

March 7, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-37796 Infrastructure and Energy

March 7, 2022 EX-10.42

Employment Agreement, dated as of February 13, 2018, between IEA Energy Services, LLC and Brian Hummer.

This EMPLOYMENT AGREEMENT (this "Agreement") dated as of February 13, 2018, between IEA Energy Services LLC, a Delaware limited liability company (the "Company"), and Brian K.

March 7, 2022 EX-10.43

Employment Agreement, dated as of January 15, 2018, between M III Acquisition Corp. and Christopher Hanson.

This EMPLOYMENT AGREEMENT (this "Agreement") dated as of January 15, 2018, between M II Acquisition Corp.

March 7, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 7, 2022 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorpora

March 7, 2022 EX-4.1

Exhibit 4.1

DESCRIPTION OF CAPITAL STOCK Infrastructure and Energy Alternatives, Inc. (the ?Company?) has two classes of securities registered under Section 12(b) of the Securities Exchange Act of 1934, as amended: (1) common stock, par value $0.0001 per share, and (2) Warrants (as defined below). The following summary descriptions are qualified in their entirety by reference to the provisions of Delaware Gen

March 7, 2022 EX-99.2

© 2022. IEA. All Rights Reserved. INVESTOR PRESENTATION MARCH 2022 © 2022. IEA. All Rights Reserved. 2 This presentation contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities

? 2022. IEA. All Rights Reserved. INVESTOR PRESENTATION MARCH 2022 ? 2022. IEA. All Rights Reserved. 2 This presentation contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the ?Securities Act?) and Section 21E of the Securities Exchange Act of 1934, as amended (the ?Exchange Act?). The forward-looking statements can be identified by the

February 14, 2022 SC 13G/A

IEA / Infrastructure & Energy Alternatives Inc / Park West Asset Management LLC - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* infrastructure & energy alternatives, inc. (Name of Issuer) COMMON STOCK, PAR VALUE $0.0001 PER SHARE (Title of Class of Securities) 45686J104 (CUSIP Number) DECEMBER 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate

November 29, 2021 424B3

Infrastructure and Energy Alternatives, Inc. 12,122,602 Shares of Common Stock

Filed Pursuant to Rule 424(b)(3) Registration No. 333-260876 PROSPECTUS Infrastructure and Energy Alternatives, Inc. 12,122,602 Shares of Common Stock This prospectus relates to the resale or distribution from time to time by the selling securityholders of up to 12,122,602 shares of the common stock, par value $0.0001 per share of the Company (the ?Common Stock?). The selling securityholders may s

November 17, 2021 CORRESP

November 17, 2021

November 17, 2021 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance ? Office of Real Estate and Construction 100 F Street, N.

November 8, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED September 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 COMMISSION FILE NUMBER: 001-37796 Infrastructure & Energy Alternatives, Inc. (Exact

November 8, 2021 S-3

As filed with the Securities and Exchange Commission on November 8, 2021.

As filed with the Securities and Exchange Commission on November 8, 2021. Registration No. 333- ??????????????????????????????????????????????? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ???????? INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Exact name of registrant as specified in its charter) ???????? D

November 8, 2021 EX-4.22

Pre-Funded Warrant (Balance of Warrant Shares), dated as of August 2, 2021, issued by Infrastructure and Energy Alternatives, Inc. to ASOF Holdings I, L.P.

Exhibit 4.22 PRE-FUNDED WARRANT TO PURCHASE COMMON STOCK Number of Shares: 4,327,322 (subject to adjustment) Warrant No. W-34 Original Issue Date: August 2, 2021 Infrastructure and Alternatives, Inc., a Delaware corporation (the ?Company?), hereby certifies that, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, ASOF Holdings I, L.P., the registered

November 8, 2021 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES THIRD QUARTER 2021 FINANCIAL RESULTS

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES THIRD QUARTER 2021 FINANCIAL RESULTS Indianapolis, IN - November 8, 2021 - Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (?IEA? or the ?Company?), a leading infrastructure construction company with renewable energy and specialty civil expertise, today announced its financial results for the quarter ended September 30, 2021. Third

November 8, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 8, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorp

October 12, 2021 SC 13G/A

IEA / Infrastructure & Energy Alternatives Inc / Invesco Ltd. - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Infrastructure and Energy Alternatives Inc (Name of Issuer) Common Stock (Title of Class of Securities) 45686J104 (CUSIP Number) September 30, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule p

October 5, 2021 SC 13D/A

IEA / Infrastructure & Energy Alternatives Inc / ARES MANAGEMENT LLC - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 13)* INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Alison S. Ressler, Esq. Rita-Anne O’Neill, Esq. Sullivan & Cromwell LLP 1888 Century Park East, Suite 2

October 5, 2021 EX-99.13

JOINT FILING AGREEMENT

EX-99.13 2 tm2129192d1ex99-13.htm EXHIBIT 99.13 EXHIBIT 99.13 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (includ

August 17, 2021 EX-10.1

Indenture, dated as of August 17, 2021, by and among IEA Energy Services LLC, the guarantors party thereto from time to time and Wilmington Trust National Association, as trustee, governing the 6.625% Senior Notes due 2029.

EXECUTION VERSION IEA ENERGY SERVICES LLC, as Issuer the GUARANTORS party hereto from time to time AND WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee 6.

August 17, 2021 EX-4.1

Credit Agreement, dated as of August 17, 2021, by and among IEA Energy Services LLC, the guarantors party thereto from time to time, the lenders party thereto from time to time and CIBC Bank USA, as administrative agent and collateral agent.

Execution Version CREDIT AGREEMENT dated as of August 17, 2021 among INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC.

August 17, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 17, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorpo

August 9, 2021 EX-99.1

Infrastructure and Energy Alternatives, Inc. Prices $300 Million Offering of Senior Notes due 2029

EX-99.1 2 iea-notespricingpr.htm EX-99.1 NOTES PRICING PR Infrastructure and Energy Alternatives, Inc. Prices $300 Million Offering of Senior Notes due 2029 INDIANAPOLIS, IN – August 9, 2021 – Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (together with its subsidiaries except where the context otherwise suggests, “IEA,” “we,” “our,” “us” or the “Company”), announced that its wholly o

August 9, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 9, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorpor

August 6, 2021 SC 13G/A

IEA / Infrastructure & Energy Alternatives Inc / Park West Asset Management LLC - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* infrastructure & energy alternatives, inc. (Name of Issuer) COMMON STOCK, PAR VALUE $0.0001 PER SHARE (Title of Class of Securities) 45686J104 (CUSIP Number) JULY 29, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

August 2, 2021 EX-10.3

Pre-Funded Warrant, dated as of August 2, 2021, issued by Infrastructure and Energy Alternatives, Inc. to ASOF Holdings I, L.P.

Exhibit 10.3 PRE-FUNDED WARRANT TO PURCHASE COMMON STOCK Number of Shares: 7,747,589 (subject to adjustment) Warrant No. W-33 Original Issue Date: August 2, 2021 Infrastructure and Alternatives, Inc., a Delaware corporation (the ?Company?), hereby certifies that, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, ASOF Holdings I, L.P., the registered

August 2, 2021 EX-10.1

Stockholders’ Agreement, dated as of August 2, 2021, by and among Infrastructure and Energy Alternatives, Inc., Ares Special Situations Fund IV, L.P. and ASOF Holdings I, L.P.

Exhibit 10.1 Execution Version STOCKHOLDERS? AGREEMENT OF INFRASTRUCTURE & ENERGY ALTERNATIVES, INC. Dated as of August 2, 2021 TABLE OF CONTENTS Page Article I GOVERNANCE MATTERS 1.1 Board Composition; Representation 2 1.2 Vacancies 4 1.3 Selection of Ares Representatives 4 1.4 Compensation; Expense Reimbursement; Indemnification 5 1.5 Election 5 Article II RESTRICTED ACTIVITIES; PREEMPTIVE RIGHT

August 2, 2021 EX-99.1

Infrastructure and Energy Alternatives, Inc. Closes Public Offering of Common Stock and Pre-Funded Warrants

EX-99.1 5 ieacommonstockandpre-funde.htm EX-99.1 CLOSING EQUITY PR Infrastructure and Energy Alternatives, Inc. Closes Public Offering of Common Stock and Pre-Funded Warrants INDIANAPOLIS, Indiana, August 2, 2021 – Infrastructure and Energy Alternatives, Inc. (“IEA”) (NASDAQ: “IEA” or the “Company”), today announced the closing of its underwritten public offering of common stock and pre-funded war

August 2, 2021 EX-10.2

Sixth Amendment to Amended and Restated Registration Rights Agreement, dated of as of August 2, 2021, by and among Infrastructure and Energy Alternatives, Inc., Ares Special Situations Fund IV, L.P. and ASOF Holdings I, L.P.

Exhibit 10.2 Execution Version SIXTH AMENDMENT TO AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT This Sixth Amendment (this ?Amendment?) to the Amended and Restated Registration Rights Agreement, dated August 2, 2021, is entered into by and among Infrastructure and Energy Alternatives, Inc. (f/k/a M III Acquisition Corp.), a Delaware corporation (the ?Company?), Infrastructure and Energy Alter

August 2, 2021 8-K

Entry into a Material Definitive Agreement, Material Modification to Rights of Security Holders, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 2, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorpor

July 30, 2021 EX-99.12

JOINT FILING AGREEMENT

EX-99.12 2 tm2123482d2ex99-12.htm EXHIBIT 99.12 Exhibit 99.12 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (includ

July 30, 2021 EX-1.1

Underwriting Agreement by and among Infrastructure and Energy Alternatives, Inc and the Underwriters, dated as of July 29, 2021

8,161,502 Shares of Common Stock 7,747,589 Pre-Funded Warrants INFRASTRUCTURE & ENERGY ALTERNATIVES, INC.

July 30, 2021 EX-99.2

Infrastructure and Energy Alternatives, Inc. Announces Pricing of its Public Offering of $175 million of Common Stock and Pre-Funded Warrants

Infrastructure and Energy Alternatives, Inc. Announces Pricing of its Public Offering of $175 million of Common Stock and Pre-Funded Warrants INDIANAPOLIS, IN ? July 29, 2021 ? Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (?IEA? or the ?Company?), today announced the pricing of an underwritten public offering of common stock and, to certain investors in lieu thereof, pre-funded warra

July 30, 2021 EX-99.1

Infrastructure and Energy Alternatives, Inc. Announces Proposed Public Offering of Common Stock and Pre-Funded Warrants

Infrastructure and Energy Alternatives, Inc. Announces Proposed Public Offering of Common Stock and Pre-Funded Warrants INDIANAPOLIS, IN ? July 28, 2021 ? Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (?IEA? or the ?Company?), today announced that it intends to offer and sell shares of common stock and, to certain investors in lieu thereof, pre-funded warrants to purchase shares of co

July 30, 2021 SC 13D/A

IEA / Infrastructure & Energy Alternatives Inc / ARES MANAGEMENT LLC - SCHEDULE 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 12)* INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Alison S. Ressler, Esq. Rita-Anne O’Neill, Esq. Sullivan & Cromwell LLP 1888 Century Park East, Suite 2

July 30, 2021 424B5

Infrastructure and Energy Alternatives, Inc. 8,161,502 Shares of Common Stock Pre-Funded Warrants to Purchase 7,747,589 Shares of Common Stock 7,747,589 Shares of Common Stock Underlying the Pre-Funded Warrants

Filed Pursuant to Rule 424(b)(5) Registration No. 333-251148 Prospectus Supplement (To prospectus dated December 18, 2020) Infrastructure and Energy Alternatives, Inc. 8,161,502 Shares of Common Stock Pre-Funded Warrants to Purchase 7,747,589 Shares of Common Stock 7,747,589 Shares of Common Stock Underlying the Pre-Funded Warrants We are offering 8,161,502 shares of our common stock, par value $0

July 30, 2021 8-K

Entry into a Material Definitive Agreement, Material Modification to Rights of Security Holders, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 28, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorpora

July 30, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 30, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorpora

July 30, 2021 EX-4.1

Form of Pre-Funded Warrant

EXHIBIT 4.1 FORM OF PRE-FUNDED WARRANT TO PURCHASE COMMON STOCK Number of Shares: [ ] (subject to adjustment) Warrant No. Original Issue Date: [ ], 2021 Infrastructure and Alternatives, Inc., a Delaware corporation (the ?Company?), hereby certifies that, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, [ ], the registered holder hereof or its regis

July 30, 2021 EX-99.1

Infrastructure and Energy Alternatives, Inc. Announces Offering of Senior Notes due 2029

EX-99.1 2 iea-noteslaunchpr.htm EX-99.1 PRESS RELEASE NOTES LAUNCH Infrastructure and Energy Alternatives, Inc. Announces Offering of Senior Notes due 2029 INDIANAPOLIS, IN – July 30, 2021 – Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (together with its subsidiaries except where the context otherwise suggests, “IEA,” “we,” “our,” “us” or the “Company”), today announced that its whol

July 28, 2021 EX-5.25

Transaction Agreement, dated as of July 28, 2021, by and Among Infrastructure and Energy Alternatives, Inc., Ares Special Situations Fund IV, L.P. and ASOF Holdings I, L.P.

Exhibit 5.25 EXECUTION COPY TRANSACTION AGREEMENT BY AND AMONG INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC., ARES SPECIAL SITUATIONS FUND IV, L.P. AND ASOF HOLDINGS I, L.P. Dated as of July 28, 2021 TABLE OF CONTENTS Page Article I DEFINITIONS 2 Section 1.1 Definitions 2 Section 1.2 Construction 11 Article II CLOSING 12 Section 2.1 Closing Transactions 12 Section 2.2 Closing 14 Section 2.3 Ares Pa

July 28, 2021 EX-99.11

Joint Filing Agreement, dated as of July 28, 2021, by and among the Reporting Persons.

Exhibit 99.11 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the comm

July 28, 2021 EX-5.28

Lock up Agreement

Exhibit 5.28 Lock-Up Agreement July 25, 2021 Guggenheim Securities, LLC As Representative of the several Underwriters referred to below c/o Guggenheim Securities, LLC 330 Madison Avenue New York, New York 10017 Re: Infrastructure & Energy Alternatives, Inc. Lock-Up Agreement (the ?Lock-Up Agreement?) Ladies and Gentlemen: The undersigned understands that you, as Representative of the several Under

July 28, 2021 EX-99.2

Infrastructure and Energy Alternatives, Inc. Announces Transaction Agreement to Simplify Capital Structure

EX-99.2 4 iea-transactionagreementpr.htm EX-99.2 TRANSACTION AGREEMENT Infrastructure and Energy Alternatives, Inc. Announces Transaction Agreement to Simplify Capital Structure INDIANAPOLIS, IN – July 28, 2021 – Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA” or the “Company”), today announced that it has entered into a transaction agreement (the “Transaction Agreement”) with Ar

July 28, 2021 EX-5.27

Form of Pre-Funded Warrant

Exhibit 5.27 EXHIBIT C FORM OF PRE-FUNDED WARRANT TO PURCHASE COMMON STOCK Number of Shares: [ ] (subject to adjustment) Warrant No. Original Issue Date: March [ ], 2021 Infrastructure and Alternatives, Inc., a Delaware corporation (the ?Company?), hereby certifies that, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, [ ], the registered holder he

July 28, 2021 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES SECOND QUARTER 2021 FINANCIAL RESULTS

EX-99.1 3 a2ndqtr2021earningsrelease.htm EX-99.1 EARNINGS RELEASE Q2 2021 INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES SECOND QUARTER 2021 FINANCIAL RESULTS Indianapolis, IN - July 28, 2021 - Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA” or the “Company”), a leading infrastructure construction company with renewable energy and specialty civil expertise, today announce

July 28, 2021 SC 13D/A

IEA / Infrastructure & Energy Alternatives Inc / ARES MANAGEMENT LLC - SCHEDULE 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 11)* INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Alison S. Ressler, Esq. Rita-Anne O’Neill, Esq. Sullivan & Cromwell LLP 1888 Century Park East, Suite 2

July 28, 2021 EX-5.26

Stockholders’ Agreement

Exhibit 5.26 EXHIBIT A-1 FORM OF TRIGGER STOCKHOLDERS AGREEMENT STOCKHOLDERS? AGREEMENT OF INFRASTRUCTURE & ENERGY ALTERNATIVES, INC. Dated as of August [?], 2021 TABLE OF CONTENTS Page Article I GOVERNANCE MATTERS 1 1.1 Board Composition; Representation. 1 1.2 Vacancies. 4 1.3 Selection of Ares Representatives 4 1.4 Compensation; Expense Reimbursement; Indemnification 4 1.5 Election 5 Article II

July 28, 2021 EX-10.4

Separation Agreement and General Release, dated July 15, 2021, by and between Infrastructure and Energy Alternatives, Inc. and Gil Melman.

SEPARATION AGREEMENT AND GENERAL RELEASE This Separation Agreement and General Release (this "Agreement") is entered into between Gil Melman ("Employee") and IEA Energy Services, LLC.

July 28, 2021 424B5

SUBJECT TO COMPLETION, DATED JULY 28, 2021

Filed Pursuant to Rule 424(b)(5) Registration No. 333-251148 The information in this preliminary prospectus supplement and the accompanying prospectus is not complete and may be changed. A registration statement relating to these securities has been declared effective by the U.S. Securities and Exchange Commission. This preliminary prospectus supplement and the accompanying prospectus are not an o

July 28, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED June 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 COMMISSION FILE NUMBER: 001-37796 Infrastructure & Energy Alternatives, Inc. (Exact Name

July 28, 2021 EX-10.1

Transaction Agreement between the Company and the Ares Parties, dated as of July 28, 2021.

EXECUTION COPY TRANSACTION AGREEMENT BY AND AMONG INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC.

July 28, 2021 EX-10.3

Employment Agreement, dated as of June 29, 2021, between IEA Energy Services, LLC and Erin Roth.

EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this "Agreement") dated as of June 29, 2021, between IEA Energy Services, LLC a Delaware limited liability company (the "Company"), and Erin J.

July 28, 2021 EX-5.29

Sixth Amendment to Registration Rights Agreement

Exhibit 5.29 Final Form sixth AMENDMENT TO AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT This Sixth Amendment (this ?Amendment?) to the Amended and Restated Registration Rights Agreement, dated July [?], 2021, is entered into by and among Infrastructure and Energy Alternatives, Inc. (f/k/a M III Acquisition Corp.), a Delaware corporation (the ?Company?), Infrastructure and Energy Alternatives

July 28, 2021 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Material Modification to Rights of Security Holders, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 28, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorpora

July 1, 2021 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 1, 2021 (May 5, 2021) Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction o

May 19, 2021 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 12)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 12)* Infrastructure and Energy Alternatives, Inc. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Todd E. Molz General Counsel, Chief Administrative Officer & Managing Director Oaktree Capital Group,

May 17, 2021 S-8

As filed with the Securities and Exchange Commission on May 17, 2021.

As filed with the Securities and Exchange Commission on May 17, 2021. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Form S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Infrastructure and Energy Alternatives, Inc. (Exact name of registrant as specified in its charter) Delaware 47-4787177 (State or other jurisdiction of incorporation or or

May 14, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 13, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporation)

May 14, 2021 EX-10.1

Infrastructure and Energy Alternatives, Inc. 2018 Equity Incentive Plan (as amended and restated as of May 13, 2021).

Infrastructure and Energy Alternatives, Inc. 2018 Equity Incentive Plan (Amended and Restated as of May 13, 2021) 1.Purpose. The Amended and Restated Infrastructure and Energy Alternatives, Inc. 2018 Equity Incentive Plan (the ?Plan?) is intended to help Infrastructure and Energy Alternatives, Inc., a Delaware corporation (including any successor thereto, the ?Company?) and its Affiliates (i) attr

May 14, 2021 EX-10.2

Infrastructure and Energy Alternatives, Inc. 2021 Employee Stock Purchase Plan.

EX-10.2 3 iea-2021employeestockpurch.htm EX-10.2 EMPLOYEE STOCK PURCHASE PLAN INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. 2021 EMPLOYEE STOCK PURCHASE PLAN 1.Purpose. The purpose of the Plan is to provide employees of the Company and its Designated Companies with an opportunity to acquire a proprietary interest in the Company through the purchase of shares of Common Stock. The Company intends for

May 12, 2021 424B3

Infrastructure and Energy Alternatives, Inc. 25,493,021 Shares of Common Stock

Filed Pursuant to Rule 424(b)(3) Registration No. 333-255097 PROSPECTUS Infrastructure and Energy Alternatives, Inc. 25,493,021 Shares of Common Stock This prospectus relates to the resale, from time to time, of up to 25,493,021 shares of Infrastructure and Energy Alternatives, Inc.?s (the ?Company,? ?IEA,? ?we,? ?us,? or ?our?) common stock, par value $0.0001 per share (the ?Common Stock?) being

May 10, 2021 EX-10.3

Termination Letter Agreement, dated March 26, 2021, by and among Infrastructure and Energy Alternatives, Inc., Infrastructure and Energy Alternatives, LLC, Oaktree Power Opportunities Fund III Delaware, L.P. and M III Sponsor I LLC.

EX-10.3 2 terminationletter.htm EX-10.3 TERMINATION LETTER March 26, 2021 Infrastructure and Energy Alternatives, Inc. 6325 Digital Way, Suite 460 Indianapolis, IN 46278 Attention: Gil Melman MIII Sponsor I LLC c/o MIII Partners 130 West 42nd Street, 17th Floor New York, NY 10036 Attention Mohsin Y. Meghji Re: Termination of Third Amended and Restated Investor Rights Agreement dated as of January

May 10, 2021 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 5, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporation)

May 10, 2021 EX-99.2

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES THE APPOINTMENT OF THEODORE H. BUNTING TO BOARD OF DIRECTORS

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES THE APPOINTMENT OF THEODORE H. BUNTING TO BOARD OF DIRECTORS Indianapolis, IN ? May 10, 2021 ? Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (?IEA? or the ?Company?), a leading infrastructure construction company with renewable energy and specialty civil expertise, today announced the appointment of Theodore H. Bunting to the Comp

May 10, 2021 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES FIRST QUARTER 2021 FINANCIAL RESULTS AND REVENUE GUIDANCE INCREASE

EX-99.1 2 a1stqtr2021earningsrelease.htm EX-99.1 EARNINGS RELEASE Q1 2021 INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES FIRST QUARTER 2021 FINANCIAL RESULTS AND REVENUE GUIDANCE INCREASE Indianapolis, IN - May 10, 2021 - Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA” or the “Company”), a leading infrastructure construction company with renewable energy and specialty civ

May 10, 2021 EX-10.4

2021 Annual Incentive Compensation Program.

EX-10.4 3 a2021aicp.htm EX-10.4 AICP INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. 2021 ANNUAL INCENTIVE COMPENSATION PROGRAM Effective May 5, 2021 1.Purpose The Compensation Committee (the “Committee”) of the Board of Directors of Infrastructure and Energy Alternatives, Inc., a Delaware corporation (the “Company”) has determined that it is desirable to maintain an annual incentive compensation pro

May 10, 2021 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 COMMISSION FILE NUMBER: 001-37796 Infrastructure & Energy Alternatives, Inc. (Exact Name

May 3, 2021 CORRESP

May 3, 2021

Infrastructure and Energy Alternatives, Inc. 6325 Digital Way Suite 460 Indianapolis, IN 46278 Tel (800) 688 3775 Tel (317) 210 9550 www.iea.net May 3, 2021 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance ? Office of Real Estate and Construction 100 F Street, N.E. Washington, D.C. 20549 Attention: Ronald E. Alper Re: Infrastructure and Energy Alternatives

April 7, 2021 EX-4.27

Form of Warrant Certificate, dated March 23, 2021, by and among Infrastructure and Energy Alternatives, Inc. and each party to the Joinder Agreement to Registration Rights Agreement dated March 23, 2021 filed as Exhibit 10.1 to this Registration Statement.

EX-4.27 2 iea-ex427formofwarrantcert.htm EX-4.27 WARRANT CERTIFICATE Exhibit 4.27 WARRANT THIS SECURITY AND THE SECURITIES, IF ANY, ISSUABLE UPON EXERCISE OF THIS SECURITY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), AND MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED EXCEPT IN ACCORDANCE WITH THE FOLLOWING SENTENCE. BY ITS ACQUISITION HE

April 7, 2021 EX-10.1

Joinder to Registration Rights Agreement, dated March 23, 2021, by and among Infrastructure and Energy Alternatives, Inc. and the parties named therein.

EX-10.1 4 joinderagreementtoregistra.htm EX-10.1 JOINDER AGREEMENT Exhibit 10.1 JOINDER AGREEMENT TO REGISTRATION RIGHTS AGREEMENT MARCH 23, 2021 This JOINDER (the “Joinder Agreement”) to the Registration Rights Agreement, dated as of March 26, 2018, by and among Infrastructure and Energy Alternatives, Inc. (f/k/a M III Acquisition Corp.), a Delaware corporation (the “Company”), M III Sponsor I LL

April 7, 2021 S-3

- S-3

As filed with the Securities and Exchange Commission on April 7, 2021 Registration No.

March 26, 2021 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive

March 26, 2021 DEF 14A

- DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Definitive Proxy State

March 25, 2021 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 11)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 11)* Infrastructure and Energy Alternatives, Inc. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Todd E. Molz General Counsel, Chief Administrative Officer & Managing Director Oaktree Capital Group,

March 24, 2021 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 23, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporatio

March 8, 2021 EX-21.1

List of Subsidiaries of the Registrant.

Infrastructure and Energy Alternatives, Inc. Subsidiaries December 31, 2020 Subsidiary Jurisdiction of Formation Former Name or Alias Infrastructure and Energy Alternatives, Inc. Delaware M III Acquisition Corp. IEA Intermediate Holdco, LLC Delaware IEA Energy Services LLC Delaware IEA Management Services, Inc. Delaware IEA Equipment Management, LLC Delaware IEA Equipment Management, Inc. Bianchi

March 8, 2021 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES FOURTH QUARTER AND FULL YEAR 2020 FINANCIAL RESULTS AND ISSUES 2021 GUIDANCE

EX-99.1 2 a4thqtr2020earningsrelease.htm EX-99.1 4TH QTR ER INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES FOURTH QUARTER AND FULL YEAR 2020 FINANCIAL RESULTS AND ISSUES 2021 GUIDANCE Indianapolis, IN - March 8, 2021 - Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA” or the “Company”), a leading infrastructure construction company with renewable energy and specialty civil

March 8, 2021 10-K

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-37796 Infrastructure and Energy

March 8, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 8, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporation

March 8, 2021 EX-4.1

Description of Securities Registered under Section 12

EX-4.1 2 descriptionofregisteredsec.htm EX-4.1 DESCRIPTION OF SECURITIES DESCRIPTION OF CAPITAL STOCK Infrastructure and Energy Alternatives, Inc. (the “Company”) has two classes of securities registered under Section 12(b) of the Securities Exchange Act of 1934, as amended: (1) common stock, par value $0.0001 per share, and (2) Warrants (as defined below). The following summary descriptions are q

March 8, 2021 EX-99.2

© 2021. IEA. All Rights Reserved. INVESTOR PRESENTATION MARCH 2021 © 2021. IEA. All Rights Reserved. 2 All statements, other than statements of historical fact, included in this presentation contain forward-looking statements within the meaning of Se

EX-99.2 3 ieamarch2021investorpres.htm EX-99.2 2020 Q4 INVESTOR DECK © 2021. IEA. All Rights Reserved. INVESTOR PRESENTATION MARCH 2021 © 2021. IEA. All Rights Reserved. 2 All statements, other than statements of historical fact, included in this presentation contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) and Se

February 16, 2021 EX-1

JOINT FILING AGREEMENT

Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of them of a statement on Schedule 13G (including amendments thereto) with respect to the shares of common stock, par value $0.

February 16, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* infrastructure & energy alternatives, inc. (Name of Issuer) COMMON STOCK, PAR VALUE $0.0001 PER SHARE (Title of Class of Securities) 45686J104 (CUSIP Number) February 5, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate b

February 16, 2021 SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* infrastructure & energy alternatives, inc. (Name of Issuer) COMMON STOCK, PAR VALUE $0.0001 PER SHARE (Title of Class of Securities) 45686J104 (CUSIP Number) February 4, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate bo

February 12, 2021 SC 13G

Infrastructure & Energy Alternatives, Inc.

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Infrastructure & Energy Alternatives, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 45686J104 (CUSIP Number) February 4, 2021 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate

February 11, 2021 SC 13D/A

Under the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 10)* INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Alison S. Ressler, Esq. Rita-Anne O’Neill, Esq. Sullivan & Cromwell LLP 1888 Century Park East, Suite 2

February 11, 2021 EX-99.11

Joint Filing Agreement, dated as of February 11, 2021, by and among the Reporting Persons.

Exhibit 99.11 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the comm

February 10, 2021 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 10)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 10)* Infrastructure and Energy Alternatives, Inc. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Todd E. Molz General Counsel, Chief Administrative Officer & Managing Director Oaktree Capital Group,

February 5, 2021 EX-99.41

FIFTH AMENDMENT TO AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

EXHIBIT 41 FIFTH AMENDMENT TO AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT This Fifth Amendment (this “Amendment”) to the Amended and Restated Registration Rights Agreement, dated February 3, 2021, is entered into by and among Infrastructure and Energy Alternatives, Inc.

February 5, 2021 SC 13D/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 9)*

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 9)* Infrastructure and Energy Alternatives, Inc. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Todd E. Molz General Counsel, Chief Administrative Officer & Managing Director Oaktree Capital Group,

February 5, 2021 EX-99.10

Joint Filing Agreement, dated as of February 5, 2021, by and among the Reporting Persons.

EX-99.10 5 tm215381d1ex99-10.htm EXHIBIT 99.10 Exhibit 99.10 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (includi

February 5, 2021 EX-99.1

JOINT FILING AGREEMENT

EX-99.1 2 eh210127785ex9901.htm EXHIBIT 99.1 EXHIBIT 1 JOINT FILING AGREEMENT Pursuant to Rule 13(d)-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, each of the undersigned acknowledges and agrees that the foregoing statement on Schedule 13D is filed on behalf of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf

February 5, 2021 EX-99.43

Form of Lock-Up Agreement

EX-99.43 5 eh210127785ex9943.htm EXHIBIT 43 EXHIBIT 43 Execution Version Form of Lock-Up Agreement February 4, 2021 Guggenheim Securities, LLC As Representative of the several Underwriters referred to below c/o Guggenheim Securities, LLC 330 Madison Avenue New York, New York 10017 Re: Infrastructure & Energy Alternatives, Inc. Lock-Up Agreement (the “Lock-Up Agreement”) Ladies and Gentlemen: The u

February 5, 2021 EX-5.21

Stock Purchase Agreement, dated as of February 3, 2021, by and among Infrastructure and Energy Alternatives, LLC, OT POF IEA Preferred B Aggregator, Ares Special Situations Fund IV, L.P. and ASOF Holdings I, L.P.

EX-5.21 2 tm215381d1ex5-21.htm EXHIBIT 5.21 Exhibit 5.21 STOCK PURCHASE AGREEMENT THIS STOCK PURCHASE AGREEMENT, dated as of February 3, 2021 (this “Agreement”), by and among Infrastructure and Energy Alternatives, LLC (“IEA LLC”) and OT POF IEA Preferred B Aggregator, L.P. (“Aggregator”) (each, a “Seller” and collectively, the “Sellers”) and Ares Special Situations Fund IV, L.P. and ASOF Holdings

February 5, 2021 EX-99.40

STOCK PURCHASE AGREEMENT

EX-99.40 3 eh210127785ex9940.htm EXHIBIT 40 EXHIBIT 40 Execution Version STOCK PURCHASE AGREEMENT THIS STOCK PURCHASE AGREEMENT, dated as of February 3, 2021 (this “Agreement”), by and among Infrastructure and Energy Alternatives, LLC (“IEA LLC”) and OT POF IEA Preferred B Aggregator, L.P. (“Aggregator”) (each, a “Seller” and collectively, the “Sellers”) and Ares Special Situations Fund IV, L.P. a

February 5, 2021 EX-5.22

Lockup Agreement, dated as of February 3, 2021, by and among Guggenheim Securities, LLC, as representatives of several underwriters, and Ares Special Situations Fund IV, L.P. and ASOF Holdings I, L.P.

EX-5.22 3 tm215381d1ex5-22.htm EXHIBIT 5.22 Exhibit 5.22 Form of Lock-Up Agreement February 3, 2021 Guggenheim Securities, LLC As Representative of the several Underwriters referred to below c/o Guggenheim Securities, LLC 330 Madison Avenue New York, New York 10017 Re: Infrastructure & Energy Alternatives, Inc. Lock-Up Agreement Ladies and Gentlemen: The undersigned understands that you, as Repres

February 5, 2021 SC 13D/A

Under the Securities Exchange Act of 1934 (Amendment No. 9)* INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) (CUSIP Number) Alison S. Ressler, Esq. Rita-Anne O’Neill, Esq. S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 9)* INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Alison S. Ressler, Esq. Rita-Anne O’Neill, Esq. Sullivan & Cromwell LLP 1888 Century Park East, Suite 21

February 5, 2021 EX-5.23

Fifth Amendment to the Registration Rights Agreement dated as of February 3, 2021, by and among Infrastructure and Energy Alternatives, Inc., Ares Special Situations Fund IV, L.P., ASOF Holdings I, L.P. and the other parties thereto.

Exhibit 5.23 FIFTH AMENDMENT TO AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT This Fifth Amendment (this “Amendment”) to the Amended and Restated Registration Rights Agreement, dated February 3, 2021, is entered into by and among Infrastructure and Energy Alternatives, Inc. (f/k/a M III Acquisition Corp.), a Delaware corporation (the “Company”), Infrastructure and Energy Alternatives, LLC (th

February 4, 2021 EX-10.1

Fifth Amendment to Amended and Restated Registration Rights Agreement, dated as of February 3, 2021, by and among Infrastructure and Energy Alternatives, Inc., Infrastructure and Energy Alternatives, LLC, Ares Special Situations Fund IV, L.P., ASOF Holdings I, L.P. and OT POF IEA Preferred B Aggregator, L.P.

FIFTH AMENDMENT TO AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT This Fifth Amendment (this “Amendment”) to the Amended and Restated Registration Rights Agreement, dated February 3, 2021, is entered into by and among Infrastructure and Energy Alternatives, Inc.

February 4, 2021 EX-1.1

Underwriting Agreement dated February 4, 2021 among Infrastructure and Energy Alternatives, Inc., the Underwriters and the Selling Stockholder.

Execution Version Common Stock INFRASTRUCTURE & ENERGY ALTERNATIVES, INC. UNDERWRITING AGREEMENT February 4, 2021 Guggenheim Securities, LLC As Representative of the several Underwriters named in Schedule I attached hereto c/o Guggenheim Securities, LLC 330 Madison Avenue New York, New York 10017 Ladies and Gentlemen: Infrastructure & Energy Alternatives, Inc., a corporation organized and existing

February 4, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 3, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporat

February 4, 2021 EX-99.1

Infrastructure and Energy Alternatives, Inc. Announces Pricing of Common Stock Offering

EX-99.1 2 pressreleasepricingofoffer.htm EX-99.1 SECONDARY OFFERING PRICING RELEASE Infrastructure and Energy Alternatives, Inc. Announces Pricing of Common Stock Offering INDIANAPOLIS, IN – February 4, 2021 – Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA”), a leading infrastructure services company focused on renewable energy and transportation infrastructure, today announced t

February 4, 2021 424B4

Infrastructure and Energy Alternatives, Inc. 8,000,000 shares of common stock

TABLE OF CONTENTS  Filed Pursuant to Rule 424(b)(4)  Registration No. 333-224337 Prospectus Supplement (To prospectus dated June 26, 2018) Infrastructure and Energy Alternatives, Inc. 8,000,000 shares of common stock The selling stockholder identified in this prospectus supplement is selling 8,000,000 shares of our common stock. We are not selling any of our shares of common stock, and we will not

February 4, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 4, 2021 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporat

February 3, 2021 424B3

SUBJECT TO COMPLETION, DATED FEBRUARY 3, 2021

TABLE OF CONTENTS The information in this preliminary prospectus supplement and the accompanying prospectus is not complete and may be changed.

January 11, 2021 SC 13G

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Infrastructure and Energy Alternatives Inc (Name of Issuer) Common Stock (Title of Class of Securities) 45686J104 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule purs

January 11, 2021 EX-99

JOINT FILING AGREEMENT

EX-99 2 Rule13DJointFilingAgreement.htm JOINT FILING AGREEMENT JOINT FILING AGREEMENT In accordance with Rule 13d-1(k) (l) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing of the attached Schedule 13G, and any and all amendments thereto, and expressly authorize Invesco Ltd., as the ultimate parent company of each of its undersigned subsidiarie

January 5, 2021 SC 13D/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 7)* Infrastructure and Energy Alternatives, Inc. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Sec

CUSIP No. 45686J104 Page 1 of 7 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 7)* Infrastructure and Energy Alternatives, Inc. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) M III Partners, LP c/o Mohsin Y. Meghji 1700 Broadway, 19th Floor New York, New York

January 5, 2021 EX-99.1

Joint Filing Agreement by and among the Reporting Persons.

Exhibit 99.1 JOINT FILING AGREEMENT AGREEMENT dated as of January 4, 2021, is made between Mohsin Meghji 2016 Gift Trust and Mr. Mohsin Y. Meghji (together, the “Parties”). Each Party hereto represents to the other Party that it is eligible to use Schedule 13D to report its beneficial ownership of Common Stock, $0.0001 par value per share, of Infrastructure and Energy Alternatives, Inc. Each Party

December 16, 2020 S-3/A

- S-3/A

As filed with the Securities and Exchange Commission on December 16, 2020 Registration No.

December 16, 2020 CORRESP

-

Infrastructure and Energy Alternatives, Inc. 6325 Digital Way Suite 460 Indianapolis, IN 46278 Tel (800) 688 3775 Tel (317) 210 9550 www.iea.net December 16, 2020 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance – Office of Real Estate and Construction 100 F Street, N.E. Washington, D.C. 20549 Attention: Ronald E. Alper Re: Infrastructure and Energy Altern

December 4, 2020 EX-4.22

Form of Subordinated Note (included in Exhibit 4.22)

EX-4.22 3 subordinatedindenture.htm EX-4.22 SUBORDINATE INDENTURE Exhibit 4.22 INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC., AS ISSUER1 AND THE SUBSIDIARY GUARANTORS NAMED HEREIN, AS SUBSIDIARY GUARANTORS TO [TRUSTEE’S NAME], AS TRUSTEE SUBORDINATED INDENTURE DATED AS OF , 20 1 IEA Energy Services, LLC may co-issue the debt securities under this indenture. Table of Contents Page Article 1 DEFINITI

December 4, 2020 EX-4.20

Form of Senior Note (included in Exhibit 4.20)

Exhibit 4.20 INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC.,1 AS ISSUER AND THE SUBSIDIARY GUARANTORS NAMED HEREIN, AS SUBSIDIARY GUARANTORS TO [TRUSTEE’S NAME], AS TRUSTEE SENIOR INDENTURE DATED AS OF , 20 1 IEA Energy Services, LLC may co-issue the debt securities under this indenture. Table of Contents Page Article 1 DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION 1 Section 101 Definition

December 4, 2020 S-3

Power of Attorney

As filed with the Securities and Exchange Commission on December 4, 2020 Registration No.

November 23, 2020 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES THE ADDITION OF LAURENE BIELSKI MAHON TO BOARD OF DIRECTORS

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES THE ADDITION OF LAURENE BIELSKI MAHON TO BOARD OF DIRECTORS Indianapolis, IN – November 23, 2020 – Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA” or the “Company”), a leading infrastructure construction company with renewable energy and specialty civil expertise, today announced the appointment of Ms. Laurene Bielski Mahon t

November 23, 2020 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 19, 2020 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorpora

November 9, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 9, 2020 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporat

November 9, 2020 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES THIRD QUARTER 2020 FINANCIAL RESULTS

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES THIRD QUARTER 2020 FINANCIAL RESULTS Indianapolis, IN - November 9, 2020 - Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA” or the “Company”), a leading infrastructure construction company with renewable energy and specialty civil expertise, today announced its financial results for the quarter ended September 30, 2020. Quarte

November 9, 2020 EX-10.4

Amended and Restated Employment Agreement, dated as of November 5, 2020, between IEA Energy Services LLC and Gil Melman.

EX-10.4 5 amendedemploymentagreement.htm EX-10.4 AMENDED AND RESTATED EMPLOYMENT AGREEMENT MELMAN This AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this “Agreement”) is dated as of November 5, 2020, by and between IEA Energy Services, LLC a Delaware limited liability company (the “Company”), and Gil Melman (“Executive”), and replaces and supersedes, in its entirety, that certain Employment Agreement

November 9, 2020 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED September 30, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 COMMISSION FILE NUMBER: 001-37796 Infrastructure & Energy Alternatives, Inc. (Exact

November 9, 2020 EX-3.1

Second Amended and Restated Certificate of Incorporation of Infrastructure and Energy Alternatives, Inc., as amended through May 29, 2020.

EX-3.1 2 compositeamendedandres.htm EX-3.1 AMENDED AND RESTATED CERTIFICATE OF INCORPORATION COMPOSITE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ARTICLE I NAME The name of the corporation is Infrastructure and Energy Alternatives, Inc. (the “Corporation”). ARTICLE II PURPOSE The purpose of the Corporation is to engage in any lawful act or act

November 9, 2020 EX-10.2

Amended and Restated Employment Agreement, dated as of November 5, 2020, between IEA Energy Services LLC and J.P. Roehm (incorporated by reference to Exhibit 10.2 of the Company's Quarterly Report on Form 10-Q (File No. 001-37796) filed with the Securities Exchange Commission on November 9, 2020.

This AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this ?Agreement?) is dated as of November 5, 2020, by and between IEA Energy Services, LLC a Delaware limited liability company (the ?Company?), and John Paul Roehm (?Executive?), and replaces and supersedes, in its entirety, that certain Employment Agreement between the parties dated January 25, 2018.

November 9, 2020 EX-10.3

Amended and Restated Employment Agreement, dated as of November 5, 2020, between IEA Energy Services LLC and Michael Stoecker (incorporated by reference to Exhibit 10.3 of the Company's Quarterly Report on Form 10-Q (File No. 001-37796) filed with the Securities Exchange Commission on November 9, 2020.

This AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this ?Agreement?) is dated as of November 5, 2020, by and between IEA Energy Services, LLC a Delaware limited liability company (the ?Company?), and Michael Stoecker (?Executive?), and replaces and supersedes, in its entirety, that certain Employment Agreement between the parties dated August 8, 2019.

November 4, 2020 EX-10.1

First Amendment to the Third Amended and Restated Credit and Guarantee Agreement, dated as of October 30, 2020, by and among the Company, IEA Intermediate Holdco, LLC, IEA Energy Services LLC, the Subsidiary Guarantors party thereto, Jefferies Finance LLC, as administrative agent and as collateral agent, KeyBank National Association, as the revolving agent, an issuing bank and a revolving lender, the other revolving lenders and the financial institutions party thereto, as incremental lenders.

FIRST AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AND GUARANTEE AGREEMENT FIRST AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AND GUARANTEE AGREEMENT, dated as of October 30, 2020 (this “First Amendment”), by and among Infrastructure and Energy Alternatives, Inc.

November 4, 2020 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): October 30, 2020 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporat

September 11, 2020 424B7

PROSPECTUS SUPPLEMENT NO. 3 (to Prospectus dated June 26, 2018) INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Primary Offering of 8,480,000 Shares of Common Stock Upon Exercise of Warrants Secondary Offering of 15,418,626 Shares of Common Stock 3,273,

Filed Pursuant to Rule 424(b)(7) Registration No. 333-224337 PROSPECTUS SUPPLEMENT NO. 3 (to Prospectus dated June 26, 2018) INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Primary Offering of 8,480,000 Shares of Common Stock Upon Exercise of Warrants Secondary Offering of 15,418,626 Shares of Common Stock 3,273,803 Warrants to Purchase One-Half of One Share of Common Stock The following information

August 17, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 14, 2020 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporati

August 10, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 10, 2020 Infrastructure & Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporati

August 10, 2020 EX-10.3

Employment Agreement, dated as of August 6, 2020, between IEA Energy Services, LLC and Peter Moerbeek.

EX-10.3 2 petermoerbeekemploymen.htm EX-10.3 EMPLOYMENT AGREEMENT PETER MOERBEEK This EMPLOYMENT AGREEMENT (this “Agreement”) is dated as of August 6, 2020 by and between IEA Energy Services, LLC a Delaware limited liability company (the “Company”), and Peter Moerbeek (“Executive”), and replaces and supersedes, in its entirety, that certain offer of employment for Interim Chief Financial Officer b

August 10, 2020 EX-99.1

JOINT FILING AGREEMENT

EX-99.1 2 eh2001038ex9901.htm EXHIBIT 99.1 EXHIBIT 1 JOINT FILING AGREEMENT Pursuant to Rule 13(d)-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, each of the undersigned acknowledges and agrees that the foregoing statement on Schedule 13D is filed on behalf of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf o

August 10, 2020 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES SECOND QUARTER 2020 FINANCIAL RESULTS

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES SECOND QUARTER 2020 FINANCIAL RESULTS Indianapolis, IN - August 10, 2020 - Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA” or the “Company”), a leading infrastructure construction company with renewable energy and specialty civil expertise, today announced its financial results for the quarter ended June 30, 2020. Quarter Hig

August 10, 2020 SC 13D/A

IEA / Infrastructure & Energy Alternatives, Inc. / Infrastructure & Energy Alternatives, LLC - AMENDMENT NO. 8 Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 8)* Infrastructure and Energy Alternatives, Inc. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Todd E. Molz General Counsel, Chief Administrative Officer & Managing Director Oaktree Capital Group,

August 10, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 COMMISSION FILE NUMBER: 001-37796 Infrastructure & Energy Alternatives, Inc. (Exact Name

July 27, 2020 EX-5.20

PORTFOLIO COMPANY REMUNERATION AGREEMENT

Exhibit 5.20 PORTFOLIO COMPANY REMUNERATION AGREEMENT This Portfolio Company Agreement (the “Agreement”) is dated as of March 10, 2020 by and among Ares Management LLC (the “Management Company”) and Matthew Underwood (the “Agent”). WHEREAS, the Agent, in his capacity as a member, agent, officer or employee of the Management Company, may be directed by the Management Company to provide services to

July 27, 2020 EX-99.9

JOINT FILING AGREEMENT

Exhibit 99.9 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the commo

July 27, 2020 EX-5.19

SECOND AMENDMENT TO EQUITY COMMITMENT AGREEMENT

Exhibit 5.19 SECOND AMENDMENT TO EQUITY COMMITMENT AGREEMENT This Second Amendment, dated as of July 23, 2020 (this “Amendment”), to the Equity Commitment Agreement, dated as of October 29, 2019 (the “Equity Commitment Agreement”), as amended by the Amendment to Equity Commitment Agreement dated as of May 6, 2020, is entered into by and among (i) Infrastructure and Energy Alternatives, Inc., a Del

July 27, 2020 SC 13D/A

IEA / Infrastructure & Energy Alternatives, Inc. / ARES MANAGEMENT LLC - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 8)* INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Alison S. Ressler, Esq. Rita-Anne O’Neill, Esq. Sullivan & Cromwell LLP 1888 Century Park East, Suite 21

July 24, 2020 EX-10.1

Second Amendment to the Equity Commitment Agreement, dated as of July 22, 2020, by and among the Company, Ares Special Situations Fund IV, L.P., ASOF Holdings I, L.P., Infrastructure and Energy Alternatives, LLC, Oaktree Power Opportunities Fund III Delaware, L.P., and OT POF IEA Preferred B Aggregator, L.P.

EX-10.1 2 secondamendmenttoeca.htm EXHIBIT 10.1 SECOND AMENDMENT TO ECA Exhibit 10.1 SECOND AMENDMENT TO EQUITY COMMITMENT AGREEMENT This Second Amendment, dated as of July 22, 2020 (this “Amendment”), to the Equity Commitment Agreement, dated as of October 29, 2019 (the “Equity Commitment Agreement”), as amended by the Amendment to Equity Commitment Agreement dated as of May 6, 2020, is entered i

July 24, 2020 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 22, 2020 Infrastructure and Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporat

June 2, 2020 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 29, 2020 Infrastructure and Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporati

June 2, 2020 EX-3.1

Certificate of Amendment to the Second Amended and Restated Certificate of Incorporation of Infrastructure and Energy Alternatives, Inc., dated as of May 29, 2020.

{N4021232.1} Exhibit 3.1 CERTIFICATE OF AMENDMENT TO THE SECOND AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Infrastructure and Energy Alternatives, Inc., a corporation organized and existing under the General Corporation Law of the State of Delaware (the “Corporation”), hereby certifies as follows: FIRST: The Board of Directors of the Corporati

May 20, 2020 424B3

Infrastructure and Energy Alternatives, Inc. Up to 12,029 Shares of Common Stock Issuable upon the Exercise of Warrants

Filed Pursuant to Rule 424(b)(3) Registration Statement No. 333-235280 PROSPECTUS Infrastructure and Energy Alternatives, Inc. Up to 12,029 Shares of Common Stock Issuable upon the Exercise of Warrants This prospectus relates to the issuance by Infrastructure and Energy Alternatives, Inc., a Delaware corporation (the “Company,” “we,” “us,” or “our”), of up to 12,029 shares of common stock, par val

May 19, 2020 EX-10.1

Form of Amended and Restated Performance Based Restricted Stock Unit Award Agreement (2020 Grants)

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. AMENDED AND RESTATED 2018 EQUITY INCENTIVE PLAN PERFORMANCE BASED RESTRICTED STOCK UNIT AWARD AGREEMENT (2020 Grants) THIS RESTRICTED STOCK UNIT AWARD AGREEMENT (this “Agreement”), is entered into as of [], 20[] (the “Date of Grant”), by and between Infrastructure and Energy Alternatives, Inc. a Delaware corporation (the “Company”), and [] (the “Partici

May 19, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 14, 2020 Infrastructure and Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporati

May 8, 2020 POS AM

- POS AM

As filed with the Securities and Exchange Commission on May 8, 2020 Registration No.

May 7, 2020 EX-10.2

Amended and Restated Annual Incentive Compensation Program (incorporated by reference to Exhibit 10.2 of the Company's Quarterly Report on Form 10-Q (File No. 001-37796) filed with the Securities Exchange Commission on May 7, 2020).

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. AMENDED AND RESTATED ANNUAL INCENTIVE COMPENSATION PROGRAM Effective May 6, 2020 1. Purpose The Compensation Committee (the “Committee”) of the Board of Directors of Infrastructure and Energy Alternatives, Inc., a Delaware corporation (the “Company”) has determined that it is desirable to maintain an annual incentive compensation program (the “Program”)

May 7, 2020 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES FIRST QUARTER 2020 FINANCIAL RESULTS

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES FIRST QUARTER 2020 FINANCIAL RESULTS Indianapolis, IN - May 7, 2020 - Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA” or the “Company”), a leading infrastructure construction company with renewable energy and specialty civil expertise, today announced its financial results for the quarter ended March 31, 2020. Quarter Highlig

May 7, 2020 10-Q

Quarterly Report - 10-Q 1ST QUARTER 2020

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED March 31, 2020 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 COMMISSION FILE NUMBER: 001-37796 Infrastructure and Energy Alternatives, Inc. (Exact Na

May 7, 2020 EX-10.1

Amendment to the Equity Commitment Agreement, dated as of May 6, 2020, by and among the Company, each Commitment Party (as defined in the Equity Commitment Agreement), Oaktree Power Opportunities Fund III Delaware, L.P., Infrastructure and Energy Alternatives, LLC, and OT POF IEA Preferred B Aggregators, L.P. (incorporated by reference to Exhibit 10.1 of the Company's Quarterly Report on Form 10-Q (File No. 001-37796) filed with the Securities Exchange Commission on May 7, 2020).

AMENDMENT TO EQUITY COMMITMENT AGREEMENT This Amendment, dated as of May 6, 2020 (this “Amendment”), to the Equity Commitment Agreement, dated as of October 29, 2019 (the “Equity Commitment Agreement”), is entered into by and among (i) Infrastructure and Energy Alternatives, Inc.

May 7, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 7, 2020 Infrastructure and Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporatio

April 10, 2020 DEF 14A

Definitive Proxy Statement on Schedule 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ý Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ý Definitive Proxy State

April 10, 2020 DEFA14A

IEA / Infrastructure & Energy Alternatives, Inc. DEFA14A - - DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ý Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive

March 27, 2020 PRE 14A

IEA / Infrastructure & Energy Alternatives, Inc. PRE 14A - - DEF 14A PREFILING 2019

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ý Filed by a Party other than the Registrant ☐ Check the appropriate box: ý Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Definitive Proxy State

March 12, 2020 10-K

Form 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2019 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO COMMISSION FILE NUMBER: 001-37796 Infrastructure and Energy

March 12, 2020 EX-4.1

Description of Securities Registered under Section 12

EX-4.1 2 descriptionofregisteredsec.htm DESCRIPTION OF REGISTERED SECURITIES DESCRIPTION OF CAPITAL STOCK Infrastructure and Energy Alternatives, Inc. (the “Company”) has two classes of securities registered under Section 12(b) of the Securities Exchange Act of 1934, as amended: (1) common stock, par value $0.0001 per share, and (2) Warrants (as defined below). The following summary descriptions a

March 12, 2020 SC 13D/A

IEA / Infrastructure & Energy Alternatives, Inc. / ARES MANAGEMENT LLC - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 7)* INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Alison S. Ressler, Esq. Rita-Anne O’Neill, Esq. Sullivan & Cromwell LLP 1888 Century Park East, Suite 21

March 12, 2020 EX-99.8

JOINT FILING AGREEMENT

EX-99.8 2 a20-116723ex99d8.htm EX-99.8 Exhibit 99.8 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13D referred to below) on behalf of each of them of a statement on Schedule 13D (including amendm

March 12, 2020 EX-21.1

List of Subsidiaries of the Registrant.

EX-21.1 5 subsidiarylisting211-123119.htm SUBSIDIARY LISTING Infrastructure and Energy Alternatives, Inc. Subsidiaries December 31, 2019 Subsidiary Jurisdiction of Formation Former Name or Alias Infrastructure and Energy Alternatives, Inc. Delaware M III Acquisition Corp. IEA Intermediate Holdco, LLC Delaware IEA Energy Services LLC Delaware IEA Management Services, Inc. Delaware IEA Equipment Man

March 12, 2020 EX-10.51

Letter Agreement, dated March 5, 2020, by and between Infrastructure and Energy Alternatives, Inc. and Pete Moerbeek.

March 5, 2020 Dear Mr. Moerbeek, It is a pleasure to extend to you an offer of employment with IEA Energy Services, LLC. (the “Company”). I look forward to your contribution and success under the role of Interim Chief Financial Officer, reporting to the Chief Executive Officer, JP Roehm, in our Indianapolis, IN corporate office. It is anticipated this interim assignment will have a minimum duratio

March 12, 2020 EX-10.52

Separation Agreement and General Release, dated March 11, 2020, by and between Infrastructure and Energy Alternatives, Inc. and Andrew Layman.

EX-10.52 4 laymanseperationagreement.htm EXHIBIT 10.52 SEPARATION AGREEMENT SEPARATION AGREEMENT AND GENERAL RELEASE This Separation Agreement and General Release (this “Agreement”) is entered into between Andrew Layman (“Employee”) and IEA Energy Services, LLC. IEA Energy Services, LLC is hereinafter referred to as “IEA” or the “Company,” and includes Infrastructure and Energy Alternatives, Inc.

March 10, 2020 EX-99.2

Fourth Quarter Earnings Presentation March 10, 2020 Safe Harbor Statement This presentation contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) and Section 21E of the

ieaq4earningspresentatio Fourth Quarter Earnings Presentation March 10, 2020 Safe Harbor Statement This presentation contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

March 10, 2020 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES FOURTH QUARTER AND FULL YEAR 2019 FINANCIAL RESULTS

EX-99.1 2 pressreleaseq42019.htm EXHIBIT 99.1 PRESS RELEASE Q4 2019 INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES FOURTH QUARTER AND FULL YEAR 2019 FINANCIAL RESULTS Indianapolis, IN - March 10, 2020 - Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA” or the “Company”), a leading infrastructure construction company with specialized energy and heavy civil expertise, today a

March 10, 2020 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 10, 2020 Infrastructure and Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorpora

March 4, 2020 EX-4.1

Warrant Agreement, dated as of March 3, 2020, by and between Infrastructure and Energy Alternatives, Inc. and Continental Stock Transfer & Trust Company (incorporated by reference to Exhibit 4.1 of the Company’s Current Report on Form 8-K (File No. 001-37796) filed March 4, 2020).

Exhibit 4.1 WARRANT AGREEMENT THIS WARRANT AGREEMENT (this “Agreement”), dated as of March 3, 2020 (the “Effective Date”), is entered into by and between Infrastructure and Energy Alternatives, Inc., a Delaware corporation (the “Company”), and Continental Stock Transfer & Trust Company, a New York corporation (the “Warrant Agent”). WHEREAS, the Company has filed with the Securities and Exchange Co

March 4, 2020 424B3

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Subscription Rights to Purchase Up to 15,000 Units Consisting of an Aggregate of Up to 15,000 Shares of Series B-3 Preferred Stock and Warrants to Purchase Up to 515,625 Shares of Common Stock at a Subscri

Filed Pursuant to Rule 424(b)(3) Registration No. 333-235280 PROSPECTUS SUPPLEMENT NO. 2 (to Prospectus dated January 31, 2020, as Supplemented by Prospectus Supplement No. 1 dated February 20, 2020) INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Subscription Rights to Purchase Up to 15,000 Units Consisting of an Aggregate of Up to 15,000 Shares of Series B-3 Preferred Stock and Warrants to Purchase

March 4, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 3, 2020 Infrastructure and Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorporat

March 4, 2020 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES CONCLUSION OF RIGHTS OFFERING

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES CONCLUSION OF RIGHTS OFFERING INDIANAPOLIS, March 3, 2020 (GLOBE NEWSWIRE) - Infrastructure and Energy Alternatives, Inc. (“IEA” or the “Company”) (NASDAQ: IEA), a leading infrastructure construction company with specialized energy and heavy civil expertise, today announced the conclusion of its previously announced rights offering (the “Right

February 24, 2020 424B3

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Subscription Rights to Purchase Up to 15,000 Units Consisting of an Aggregate of Up to 15,000 Shares of Series B-3 Preferred Stock and Warrants to Purchase Up to 515,625 Shares of Common Stock at a Subscri

Filed Pursuant to Rule 424(b)(3) Registration No. 333-235280 PROSPECTUS SUPPLEMENT NO. 1 (to Prospectus dated January 31, 2020) INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Subscription Rights to Purchase Up to 15,000 Units Consisting of an Aggregate of Up to 15,000 Shares of Series B-3 Preferred Stock and Warrants to Purchase Up to 515,625 Shares of Common Stock at a Subscription Price of $1,000.

February 20, 2020 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 20, 2020 Infrastructure and Energy Alternatives, Inc. (Exact Name of Registrant as Specified in Charter) Delaware 001-37796 47-4787177 (State or Other Jurisdiction of Incorp

February 20, 2020 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES EXECUTIVE MANAGEMENT CHANGES Reconfirms 2019 Financial Guidance, Issues Preliminary 2020 Guidance and Announces Date of Fourth Quarter 2019 Earnings Call

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES EXECUTIVE MANAGEMENT CHANGES Reconfirms 2019 Financial Guidance, Issues Preliminary 2020 Guidance and Announces Date of Fourth Quarter 2019 Earnings Call Indianapolis, IN - February 20, 2020 - Infrastructure and Energy Alternatives, Inc. (“IEA” or the “Company”) (NASDAQ: IEA), a leading infrastructure construction company with specialized ener

January 31, 2020 424B2

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Subscription Rights to Purchase Up to 15,000 Units Consisting of an Aggregate of Up to 15,000 Shares of Series B-3 Preferred Stock and Warrants to Purchase Up to 515,625 Shares of Common Stock at a Subscri

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents Filed Pursuant to Rule 424(b)(2) Registration File No.

January 29, 2020 S-1/A

IEA / Infrastructure & Energy Alternatives, Inc. S-1/A - - S-1/A

Use these links to rapidly review the document TABLE OF CONTENTS INDEX TO FINANCIAL STATEMENTS Table of Contents As filed with the Securities and Exchange Commission on January 29, 2020.

January 29, 2020 EX-99.2

Form of Letter to Stockholders who are Record Holders

Exhibit 99.2 FORM OF LETTER TO STOCKHOLDERS WHO ARE RECORD HOLDERS INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Subscription Rights to Purchase Units Offered Pursuant to Subscription Rights Distributed to Public Stockholders of Infrastructure and Energy Alternatives, Inc. , 20 Dear Stockholder: This letter is being distributed by Infrastructure and Energy Alternatives, Inc. (the "Company") to cert

January 29, 2020 EX-99.6

Form of Nominee Holder Certification

QuickLinks - Click here to rapidly navigate through this document Exhibit 99.6 FORM OF NOMINEE HOLDER CERTIFICATION INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. The undersigned, a bank, broker, dealer, trustee, depositary, or other nominee of transferable subscription rights to purchase units (the "Units") of Infrastructure and Energy Alternatives, Inc. (the "Company"), said Units consisting of on

January 29, 2020 EX-4.15

Form of Warrant Certificate (included as

Exhibit 4.15 WARRANT AGREEMENT THIS WARRANT AGREEMENT (this “Agreement”), dated as of , 20 (the “Effective Date”), is entered into by and between Infrastructure and Energy Alternatives, Inc., a Delaware corporation (the “Company”), and Continental Stock Transfer & Trust Company, a New York corporation (the “Warrant Agent”). WHEREAS, the Company has filed with the Securities and Exchange Commission

January 29, 2020 EX-99.4

Form of Broker Letter to Clients Who are Beneficial Holders

QuickLinks - Click here to rapidly navigate through this document Exhibit 99.4 FORM OF BROKER LETTER TO CLIENTS WHO ARE BENEFICIAL HOLDERS OF INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Subscription Rights to Purchase Units Offered Pursuant to Subscription Rights Distributed to Public Stockholders of Infrastructure and Energy Alternatives, Inc. , 20 To our Clients: This letter is being distribute

January 29, 2020 CORRESP

IEA / Infrastructure & Energy Alternatives, Inc. CORRESP - -

Infrastructure and Energy Alternatives, Inc. 6325 Digital Way Suite 460 Indianapolis, IN 46278 Tel (800) 688 3775 Tel (317) 210 9550 www.iea.net January 29, 2020 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance — Office of Real Estate and Construction 100 F Street, N.E. Washington, D.C. 20549 Attention: Ronald E. Alper Re: Infrastructure and Energy Alterna

January 29, 2020 EX-10.49

Vice Chairman Letter Agreement with Derek Glanvill (incorporated by reference to Exhibit 10.49 of the Company's Amendment No. 1 to the Registration Statement on Form S-1 (File No. 333-235280) filed with the Securities Exchange Commission on January 29, 2020).

Exhibit 10.49 Infrastructure and Energy Alternatives, Inc. 6325 Digital Way Suite 460 Indianapolis, IN 46278 Tel (800) 688 3775 Tel (317) 210 9550 www.iea.net February 13, 2019 Mr. Derek Glanvill 10088 Carters Manor Drive Ladue, MO 63124 Re: Appointment as Vice Chairman of the Board of Directors of Infrastructure and Energy Alternatives, Inc. (the “Company”) Dear Mr. Glanvill: This letter agreemen

January 29, 2020 EX-4.13

Subscription Rights Certificate (incorporated by reference to Exhibit 4.13 of the Company’s Registration Statement on Form S-1 (File No. 333-235280) filed on January 29, 2020).

Exhibit 4.13 CERTIFICATE # [ ] NUMBER OF SUBSCRIPTION RIGHTS: [ ] THE TERMS AND CONDITIONS OF THE RIGHTS OFFERING ARE SET FORTH IN THE COMPANY’S PROSPECTUS DATED , 2020 (THE “PROSPECTUS”) AND ARE INCORPORATED HEREIN BY REFERENCE. COPIES OF THE PROSPECTUS ARE AVAILABLE UPON REQUEST FROM MORROW SODALI, THE INFORMATION AGENT. INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (Incorporated under the laws o

January 29, 2020 EX-99.7

Form of Notice of Important Tax Information

QuickLinks - Click here to rapidly navigate through this document Exhibit 99.7 FORM OF NOTICE OF IMPORTANT TAX INFORMATION INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. This notice is provided in connection with the prospectus of Infrastructure and Energy Alternatives, Inc. ("IEA") dated , 20 . Under the U.S. federal income tax laws, dividend payments (including constructive dividend payments) that

January 29, 2020 EX-99.1

Form of Instructions as to Use of Subscription Rights Certificates

Exhibit 99.1 FORM OF INSTRUCTIONS AS TO USE OF SUBSCRIPTION RIGHTS CERTIFICATES INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Please consult Morrow Sodali LLC, the information agent, or Continental Stock Transfer & Trust Company, the subscription agent, or your bank or broker as to any questions. The following instructions relate to a rights offering by Infrastructure and Energy Alternatives, Inc.,

January 29, 2020 EX-99.3

Form of Letter to Brokers, Dealers, Banks and Other Nominees

Exhibit 99.3 FORM OF LETTER TO BROKERS, DEALERS, BANKS AND OTHER NOMINEE INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. Subscription Rights to Purchase Units Offered Pursuant to Subscription Rights Distributed to Public Stockholders of Infrastructure and Energy Alternatives, Inc. , 20 To Brokers, Dealers, Banks and Other Nominees: This letter is being distributed by Infrastructure and Energy Alterna

January 29, 2020 EX-99.5

Form of Beneficial Owner Election Form

QuickLinks - Click here to rapidly navigate through this document Exhibit 99.5 FORM OF BENEFICIAL OWNER ELECTION FORM INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. The undersigned acknowledge(s) receipt of your letter and the enclosed materials referred to therein relating to the rights offering by Infrastructure and Energy Alternatives, Inc., a Delaware corporation (the "Company"), of transferable

January 28, 2020 EX-99.1

Joint Filing Agreement, by and among the Reporting Persons, dated as of January 28, 2020.

EXHIBIT 1 JOINT FILING AGREEMENT Pursuant to Rule 13(d)-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, each of the undersigned acknowledges and agrees that the foregoing statement on Schedule 13D is filed on behalf of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of the undersigned without the necessity of filing additional joint acquisition statements.

January 28, 2020 SC 13D/A

IEA / Infrastructure & Energy Alternatives, Inc. / Infrastructure & Energy Alternatives, Llc - AMENDMENT NO. 7 Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 7)* Infrastructure and Energy Alternatives, Inc. (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 45686J104 (CUSIP Number) Todd E. Molz General Counsel, Chief Administrative Officer & Managing Director Oaktree Capital Group,

January 27, 2020 EX-99.1

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES KEY DATES AND TIMELINE FOR RIGHTS OFFERING

EX-99.1 5 pressreleaserightsoffering.htm PR RIGHTS OFFERING INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. ANNOUNCES KEY DATES AND TIMELINE FOR RIGHTS OFFERING Indianapolis, IN - January 17, 2020 - Infrastructure and Energy Alternatives, Inc. (NASDAQ: IEA) (“IEA” or the “Company”), a leading infrastructure construction company with specialized energy and heavy civil expertise, today provided an info

January 27, 2020 EX-10.1

Third Amended and Restated Investors Rights Agreement, dated as of January 23, 2020, by and among Infrastructure and Energy Alternatives, Inc., M III Sponsor I LLC, Infrastructure and Energy Alternatives, LLC and Oaktree Power Opportunities Fund III Delaware, L.P. (incorporated by reference to Exhibit 10.1 of the Company's Current Report on Form 8-K (File No. 001-37796) filed with the Securities Exchange Commission on January 27, 2020).

INFRASTRUCTURE AND ENERGY ALTERNATIVES, INC. (f/k/a M III ACQUISITION CORP.) THIRD AMENDED AND RESTATED INVESTOR RIGHTS AGREEMENT DATED AS OF January 23, 2020 Table of Contents Article I DEFINITIONS AND USUAGE 1 Section 1.1 Definitions 2 Article II GFI REPRESENTATIVE 5 Section 2.1 GFI Representative 6 Article III APPROVAL AND CONSULTATION OF CERTAIN MATTERS 6 Section 3.1 GFI Representative Approva

January 27, 2020 EX-5.18

Waiver Agreement, dated as of January 23, 2020, by and between Ares and the Issuer.

Exhibit 5.18 Execution Version WAIVER AGREEMENT January 23, 2020 Reference is made to the (i) Second Amended and Restated Certificate of Designations of Series B-1 Preferred Stock of Infrastructure and Energy Alternatives, Inc. (the “Corporation”), dated as of November 14, 2019 (the “Series B-1 COD”) and the (ii) Amended and Restated Certificate of Designations of Series B-2 Preferred Stock of the

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