Drugs - Latest Activist Disclosures

This table shows recent activist investor (Schedule 13D) filings made in this industry. Any investor or hedge fund that makes an investment with the intention of influencing management is considered an activist investor and must file a 13D.

Date Form Target Company Investor Shares Ownership
(Percent)
Ownership Change
(Percent)
2025-08-20 13D/A PRQR / ProQR Therapeutics N.V. Van Herk Investments B.v. 12,202,190 11.60 6.09
2025-08-19 13D/A ADAP / Adaptimmune Therapeutics plc - Depositary Receipt (Common Stock) New Enterprise Associates 14, L.P. 4 0.00 -100.00
2025-08-19 13D/A IOBT / IO Biotech, Inc. Novo Holdings A/S 4,981,588 7.30 -14.46
2025-08-18 13D/A OSTX / OS Therapies Incorporated Auerbach Shalom 2,677,570 8.50 -0.37
2025-08-18 13D/A CMPX / Compass Therapeutics, Inc. Commander Aggregator, LP 7,788,150 4.50
2025-08-18 13D/A MRKR / Marker Therapeutics, Inc. New Enterprise Associates 16, L.P. 1,625,678 12.60 0.00
2025-08-15 13D/A BHC / Bausch Health Companies Inc. Icahn Partners Master Fund LP 0 0.00 -100.00
2025-08-15 13D/A CMPX / Compass Therapeutics, Inc. Orbimed Advisors Llc 15,219,994 8.90 0.00
2025-08-15 13D/A ARWR / Arrowhead Pharmaceuticals, Inc. Sarepta Therapeutics, Inc. 0 0.00 -100.00
2025-08-15 13D/A IRON / Disc Medicine, Inc. Atlas Venture Fund X, L.P. 1,084,527 3.10 -22.65
2025-08-14 13D/A BHC / Bausch Health Companies Inc. Paulson & Co. Inc. 70,755,869 19.10 115.77
2025-08-14 13D/A ACLX / Arcellx, Inc. New Enterprise Associates 15, L.P. 3,055,360 5.51 -18.42
2025-08-14 13D/A BBIO / BridgeBio Pharma, Inc. Viking Global Investors Lp 18,602,920 9.70 0.00
2025-08-14 13D/A SLDB / Solid Biosciences Inc. Ra Capital Management, L.p. 7,997,510 9.90
2025-08-14 13D/A ORIC / ORIC Pharmaceuticals, Inc. Sr One Capital Management, Llc 4,615,384 4.75 0.00
2025-08-13 13D/A AUPH / Aurinia Pharmaceuticals Inc. ILJIN SNT Co., Ltd. 6,535,141 5.00 -13.33
2025-08-13 13D/A AVBP / ArriVent BioPharma, Inc. Orbimed Advisors Llc 3,027,328 7.50 0.00
2025-08-13 13D CVAC / CureVac N.V. Glaxosmithkline Plc 16,591,937 74.00 0.00
2025-08-13 13D PCSA / Processa Pharmaceuticals, Inc. HX Entertainment Ltd 5,467,181 10.90
2025-08-12 13D/A ARMP / Armata Pharmaceuticals, Inc. Innoviva, Inc. 55,467,459 83.30 -13.57
2025-08-12 13D/A HRTX / Heron Therapeutics, Inc. Rubric Capital Management LP 29,100,728 17.50 8.94
2025-08-12 13D/A NAMS / NewAmsterdam Pharma Company N.V. Forbion Capital Fund IV Cooperatief U.A. 10,578,806 9.40 -4.90
2025-08-11 13D/A TRVI / Trevi Therapeutics, Inc. New Enterprise Associates 16, L.P. 15,074,080 12.00 0.00
2025-08-11 13D/A CDTX / Cidara Therapeutics, Inc. Ra Capital Management, L.p. 3,365,523 13.30 0.00
2025-08-08 13D/A AMRX / Amneal Pharmaceuticals, Inc. Patel Chirag K. 22,180,421 7.10 1.58
2025-08-08 13D PCRX / Pacira BioSciences, Inc. Doma Perpetual Capital Management LLC 2,698,618 5.70
2025-08-07 13D/A EPIX / ESSA Pharma Inc. Biotechnology Value Fund L P 11,668,473 24.70 33.37
2025-08-07 13D/A IMAB / I-Mab - Depositary Receipt (Common Stock) CBC Investment I-Mab Ltd 27,492,595 10.40 -18.11
2025-08-06 13D/A STTK / Shattuck Labs, Inc. Redmile Group, LLC 5,652,660 11.80 0.49
2025-08-05 13D IMAB / I-Mab - Depositary Receipt (Common Stock) Everest Medicines Limited 42,524,716 16.10
2025-08-01 13D/A ALZN / Alzamend Neuro, Inc. Ault Milton C Iii 706,322 18.50 -77.63
2025-08-01 13D/A CVAC / CureVac N.V. KfW 112,841,355 50.10 -1.18
2025-08-01 13D/A SPRY / ARS Pharmaceuticals, Inc. Deerfield Mgmt III, L.P. 7,610,217 7.75 -11.85
2025-07-31 13D/A LRMR / Larimar Therapeutics, Inc. Deerfield Private Design Fund III, L.P. 30,667,474 35.81
2025-07-31 13D/A ABVX / ABIVAX Société Anonyme - Depositary Receipt (Common Stock) Sofinnova Crossover I 9,599,478 11.40 23.16
2025-07-29 13D/A IMA / ImageneBio, Inc. Atlas Venture Fund X, L.P. 241,800 2.10
2025-07-29 13D/A INDV / Indivior PLC Two Seas Capital LP 11,662,308 9.30 -3.50
2025-07-28 13D/A CELU / Celularity Inc. Dragasac Ltd 14,138,161 41.00 42.26
2025-07-28 13D/A GLPG / Galapagos NV - Depositary Receipt (Common Stock) EcoR1 Capital, LLC 8,714,522 13.22 11.68
2025-07-28 13D/A IMA / ImageneBio, Inc. BML Investment Partners, L.P. 220,832 1.90
2025-07-25 13D/A BFRI / Biofrontera Inc. Deutsche Balaton Aktiengesellschaft 458,884 4.86 0.00
2025-07-24 13D/A PASG / Passage Bio, Inc. Orbimed Advisors Llc 132,473 4.25 -45.68
2025-07-22 13D/A SPRY / ARS Pharmaceuticals, Inc. Deerfield Mgmt III, L.P. 8,633,537 8.79 -11.22
2025-07-22 13D/A BMEA / Biomea Fusion, Inc. Cormorant Global Healthcare Master Fund, LP 3,681,664 6.46 2.53
2025-07-21 13D/A PASG / Passage Bio, Inc. Orbimed Advisors Llc 243,878 7.82 -95.88
2025-07-21 13D/A EPIX / ESSA Pharma Inc. Soleus Capital Master Fund, L.P. 4,362,026 9.80 92.84
2025-07-21 13D/A CNTB / Connect Biopharma Holdings Limited - Depositary Receipt (Common Stock) Panacea Innovation Ltd 13,950,000 25.10 4.03
2025-07-16 13D/A ONCO / Onconetix, Inc. Altos Venture AG 273,230 35.80
2025-07-16 13D HYPD / Hyperion DeFi, Inc. Hyunsu Jung 500,000 9.30
2025-07-15 13D/A RCUS / Arcus Biosciences, Inc. Gilead Sciences Inc 31,424,760 29.70 -20.83