Investor Ridgeback Capital Investments L.P.
13D/G Filings

This page shows a list of all the recent 13D/G filings made by Ridgeback Capital Investments L.P. . 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.

Add This Fund
to your dashboard

Date Form Target Prev
Shares		 Current
Shares		 Change
(Percent)		 Ownership
(Percent)		 Change
(Percent)
2026-05-21 13G REPL / Replimune Group, Inc. 6,252,651
2026-02-17 13G/A LENZ / LENZ Therapeutics, Inc. 1,951,875 0
2025-11-14 13G/A SMLR / Semler Scientific, Inc. 976,112 0
2025-11-14 13G/A ITOS / iTeos Therapeutics, Inc. 1,942,959 0
2025-07-25 13G ITOS / iTeos Therapeutics, Inc. 1,442,959 1,942,959
2025-07-16 13G SMLR / Semler Scientific, Inc. 976,112
2025-06-04 13G ITOS / iTeos Therapeutics, Inc. 1,442,959
2025-05-20 13G/A AFMDQ / Affimed N.V. 14,858,982 0
2025-02-14 13G/A PYXS / Pyxis Oncology, Inc. 4,345,228 359,231
2024-07-29 13G LENZ / LENZ Therapeutics, Inc. 1,951,875
2024-02-14 13G/A BCYC / Bicycle Therapeutics plc - Depositary Receipt (Common Stock) 2,264,801 844,235
2024-02-14 13G/A AFMD / Affimed N.V. 12,882,610 14,858,982
2024-01-26 13G PYXS / Pyxis Oncology, Inc. 4,345,228
2023-02-14 13G/A FSTX / F-star Therapeutics Inc 1,834,360 52,509
2023-02-14 13G/A AFMD / Affimed N.V. 7,722,106 12,882,610
2023-02-14 13G/A BCYC / Bicycle Therapeutics plc - Depositary Receipt (Common Stock) 2,164,801 2,264,801
2023-02-14 13G/A BCYC / Bicycle Therapeutics plc - Depositary Receipt (Common Stock) 2,164,801 2,264,801
2023-02-14 13G/A AFMD / Affimed N.V. 7,722,106 12,882,610
2023-02-14 13G/A FSTX / F-star Therapeutics Inc 1,834,360 52,509
2022-02-14 13G/A AFMD / Affimed N.V. 6,450,000 7,722,106
2022-02-14 13G/A BCYC / Bicycle Therapeutics plc - Depositary Receipt (Common Stock) 1,861,833 2,164,801
2022-02-14 13G/A FSTX / F-star Therapeutics Inc 494,360 1,834,360
2022-02-14 13G/A COGT / Cogent Biosciences, Inc. 1,252,250 0
2021-04-14 13G AFMD / Affimed N.V. 6,450,000
2021-04-09 13G/A FSTX / F-star Therapeutics Inc 407,567 494,360
2021-02-16 13G/A MYO / Myomo, Inc. 140,000 104,755
2021-02-16 13G/A COGT / Cogent Biosciences, Inc. 2,400,000 1,252,250
2021-02-16 13G/A FDMT / 4D Molecular Therapeutics, Inc. 1,438,487 1,100,000
2021-02-16 13G/A VSTM / Verastem, Inc. 10,068,243 0
2021-02-16 13G/A FSTX / F-star Therapeutics Inc 1,142,900 407,567
2021-02-16 13G/A STRO / Sutro Biopharma, Inc. 2,014,687 1,144,979
2021-02-16 13G/A BCYC / Bicycle Therapeutics plc - Depositary Receipt (Common Stock) 1,144,633 1,861,833
2020-12-23 13G FDMT / 4D Molecular Therapeutics, Inc. 1,438,487
2020-08-25 13G STRO / Sutro Biopharma, Inc. 2,014,687 2,014,687
2020-08-24 13G STRO / Sutro Biopharma, Inc. 2,014,687
2020-07-16 13G COGT / Cogent Biosciences, Inc. 2,400,000
2020-07-13 13G BCYC / Bicycle Therapeutics plc - Depositary Receipt (Common Stock) 1,144,633
2020-03-06 13G/A VSTM / Verastem, Inc. 10,068,243 10,068,243
2020-02-24 13G MYO / Myomo, Inc. 140,000
2020-02-14 13G/A KPTI / Karyopharm Therapeutics Inc. 3,945,200 0
2020-01-21 13G VSTM / Verastem, Inc. 0 10,068,243
2020-01-06 13G FSTX / F-star Therapeutics Inc 1,142,900
2019-02-14 13G/A KPTI / Karyopharm Therapeutics Inc. 2,732,125 3,945,200
2018-03-15 13G CORI / Corium International, Inc. 1,914,265
2018-02-14 13G/A VSTM / Verastem, Inc. 2,860,786 0
2018-01-26 13G KPTI / Karyopharm Therapeutics Inc. 2,732,125
2017-07-20 13G VSTM / Verastem, Inc. 2,860,786
2017-01-30 13G/A ONCS / OncoSec Medical Inc 1,292,614 0
2017-01-30 13G/A PATI / Patriot Transportation Holding, Inc. 0
2016-02-16 13G/A TRIL / Tidal Trust II - Defiance Trillion Dollar Club Index ETF 451,883 370,537
2016-02-16 13G/A ONCS / OncoSec Medical Inc 1,272,614 1,292,614
2016-02-16 13G/A CARA / Cara Therapeutics, Inc. 1,795,000 622,140
2016-02-16 13G/A AGTC / Applied Genetic Technologies Corp 246,005
2015-06-18 13G ONCS / OncoSec Medical Inc 1,272,614
2015-04-20 13G CARA / Cara Therapeutics, Inc. 1,795,000
2015-04-02 13G TRIL / Tidal Trust II - Defiance Trillion Dollar Club Index ETF 451,883
2015-02-17 13G/A AGTC / Applied Genetic Technologies Corp 1,364,941
2014-04-10 13G AGTC / Applied Genetic Technologies Corp 1,082,240
2014-02-14 13G/A SGMO / Sangamo Therapeutics, Inc. 2,900,000
2014-02-14 13G/A STML / Stemline Therapeutics, Inc. 506,699
2014-02-14 13G/A CLDX / Celldex Therapeutics, Inc. 1,025,000
2014-02-14 13G/A ARWR / Arrowhead Pharmaceuticals, Inc. 791,306
2014-02-14 13G/A GERN / Geron Corporation 225,000
2013-10-17 13G GERN / Geron Corporation 7,480,105
2013-10-16 13G ARWR / Arrowhead Pharmaceuticals, Inc. 1,817,717
2013-09-30 13G SGMO / Sangamo Therapeutics, Inc. 3,572,336
2013-02-14 13G/A IRWD / Ironwood Pharmaceuticals, Inc. 784,381
2013-02-07 13G STML / Stemline Therapeutics, Inc. 583,275
2012-12-28 13G CLDX / Celldex Therapeutics, Inc. 3,804,646
2012-02-14 13G/A MDCO / Medicines Company 748,499
2012-02-14 13G/A IRWD / Ironwood Pharmaceuticals, Inc. 6,955,317