Investor Springer Timothy A
13D/G Filings

This page shows a list of all the recent 13D/G filings made by Springer Timothy A . Schedule 13D is commonly referred to as a “beneficial ownership report.” The term "beneficial owner" is defined under SEC rules. It includes any person who directly or indirectly shares voting power or investment power (the power to sell the security).

When a person or group of persons acquires beneficial ownership of more than 5% of a voting class of a company’s equity securities, they are required to file a Schedule 13D within ten days after the purchase. Click the link icon to see the full transaction history.

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Date Form Target Prev
Shares		 Current
Shares		 Change
(Percent)		 Ownership
(Percent)		 Change
(Percent)
2025-04-07 13D/A TECX / Tectonic Therapeutic, Inc. 4,226,058 4,313,558
2025-02-10 13D/A TECX / Tectonic Therapeutic, Inc. 4,593,121 4,226,058
2025-01-15 13D/A RNAC / Cartesian Therapeutics, Inc. 9,555,394
2024-12-23 13D/A RNAC / Cartesian Therapeutics, Inc. 9,481,816 9,534,216
2024-11-18 13D/A RNAC / Cartesian Therapeutics, Inc. 9,047,688 9,481,816
2024-10-24 13D/A TECX / Tectonic Therapeutic, Inc. 4,293,121 4,593,121
2024-10-04 13D/A RNAC / Cartesian Therapeutics, Inc. 8,841,756 9,047,688
2024-09-27 13D/A RNAC / Cartesian Therapeutics, Inc. 8,833,106 8,841,756
2024-09-26 13D/A TECX / Tectonic Therapeutic, Inc. 4,243,121 4,293,121
2024-07-05 13D/A RNAC / Cartesian Therapeutics, Inc. 6,473,184 8,833,106
2024-06-26 13D TECX / Tectonic Therapeutic, Inc. 4,243,121
2024-04-12 13D/A SELB / Selecta Biosciences Inc 194,189,313 6,473,184
2024-03-28 13D/A SELB / Selecta Biosciences Inc 192,940,664 194,189,313
2023-11-17 13D/A SELB / Selecta Biosciences Inc 44,356,586 192,940,664
2023-10-18 13D MORF / Morphic Holding, Inc. 5,018,057 7,577,651
2023-09-25 13D/A SELB / Selecta Biosciences Inc 32,662,916 44,356,586
2021-12-27 13D/A SELB / Selecta Biosciences Inc 32,451,726 32,662,916
2021-12-15 13D/A SELB / Selecta Biosciences Inc 28,630,453 32,451,726
2021-05-27 13D/A SELB / Selecta Biosciences Inc 23,936,974 28,630,453
2021-02-11 13G/A MORF / Morphic Holding, Inc. 4,983,983 5,018,057
2021-02-09 13G/A SRRK / Scholar Rock Holding Corporation 2,957,422 312,951
2020-10-23 13D/A SELB / Selecta Biosciences Inc 18,404,586 23,936,974
2020-10-15 13D/A SELB / Selecta Biosciences Inc 14,932,489 18,404,586
2020-02-14 13G MORF / Morphic Holding, Inc. 4,983,983
2020-02-14 13G/A SRRK / Scholar Rock Holding Corporation 3,553,935 2,957,422
2020-01-02 13D/A SELB / Selecta Biosciences Inc 9,021,159 14,932,489
2019-12-17 13D/A SELB / Selecta Biosciences Inc 7,784,131 9,021,159
2019-09-16 13D/A SELB / Selecta Biosciences Inc 9,030,789 7,784,131
2019-08-23 13D/A SELB / Selecta Biosciences Inc 6,310,789 9,030,789
2019-03-27 13G SELB / Selecta Biosciences Inc 1,692,234
2019-03-27 13D SELB / Selecta Biosciences Inc 6,310,789
2019-02-14 13G SRRK / Scholar Rock Holding Corporation 3,553,935