Mersana Therapeutics, Inc.
MRSNDelisted Jan 6, 2026- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001442836
Mersana Therapeutics, Inc. was delisted on Jan 6, 2026; its insiders filed their last Form 4 on Jan 6, 2026; 51 institutions reported holding it in 13F filings for Q4 2025, worth $64.8M in total; no superinvestor held it.
13F holders, Q3 2024
Institutional positions in Mersana Therapeutics, Inc. as of Sep 30, 2024. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 116
- −4 vs. Q2 2024
- Shares held
- 116.1M
- +10.6M (+10.0%) vs. Q2 2024
- Total value
- $219.4M
- +$7.36M (+3.5%) vs. Q2 2024
- New holders
- 13
- 38 more added
- Sold out
- 17
- 33 more reduced
2 institutions that held it in Q2 2024 haven't filed for Q3 2024 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 2024: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting MRSN on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 0 | $0 |
| Q1 2026 | 1 | $87 |
| Q4 2025 | 51 | $64.8M |
| Q3 2025 | 49 | $24.7M |
| Q2 2025 | 85 | $22.9M |
| Q1 2025 | 111 | $30.2M |
| Q4 2024 | 132 | $149.2M |
| Q3 2024 | 116 | $219.4M |
| Q2 2024 | 122 | $229.6M |
| Q1 2024 | 125 | $526.3M |
| Q4 2023 | 106 | $263.0M |
| Q3 2023 | 128 | $144.4M |
| Q2 2023 | 147 | $370.2M |
| Q1 2023 | 158 | $437.2M |
| Q4 2022 | 152 | $592.8M |
| Q3 2022 | 152 | $623.4M |
| Q2 2022 | 126 | $408.0M |
| Q1 2022 | 128 | $322.7M |
| Q4 2021 | 122 | $436.6M |
| Q3 2021 | 110 | $648.3M |
| Q2 2021 | 131 | $957.8M |
| Q1 2021 | 132 | $1.14B |
Institutions, Q3 2024
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q2 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 19,364,688 | $36.6M | 1.25% | 00.0% | Unchanged |
| Nextech Invest AG | 12,067,246 | $22.8M | 3.20% | +2,541,100+26.7% | Added |
| VR Adviser, LLC | 11,328,000 | $21.4M | 1.12% | 00.0% | Unchanged |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $16.4M | 1.70% | 00.0% | Unchanged |
| BlackRock, Inc. | 8,621,861 | $16.3M | 0.00% | +8,621,861 | New |
| Vanguard Group Inc | 7,177,458 | $13.6M | 0.00% | +474,937+7.1% | Added |
| Citadel Advisors LLC | 4,411,555 | $8.34M | 0.01% | +1,667,956+60.8% | Added |
| Rock Springs Capital Management LP | 3,046,782 | $5.76M | 0.19% | 00.0% | Unchanged |
| State Street Corp | 2,725,394 | $5.15M | 0.00% | +43,339+1.6% | Added |
| Geode Capital Management, LLC | 2,413,215 | $4.56M | 0.00% | −80,208−3.2% | Reduced |
| JPMorgan Chase & Co | 2,351,359 | $4.44M | 0.00% | +374,460+18.9% | Added |
| Schonfeld Strategic Advisors LLC | 2,223,308 | $4.20M | 0.03% | −753,610−25.3% | Reduced |
| Goldman Sachs Group Inc | 1,959,236 | $3.70M | 0.00% | +714,299+57.4% | Added |
| Boxer Capital, LLC | 1,817,000 | $3.43M | 0.17% | +1,817,000 | New |
| Deutsche Bank AG | 1,596,173 | $3.02M | 0.00% | +20,173+1.3% | Added |
| Silverarc Capital Management, LLC | 1,585,786 | $3.00M | 0.68% | −914,799−36.6% | Reduced |
| Morgan Stanley | 1,364,216 | $2.58M | 0.00% | −908,378−40.0% | Reduced |
| 5AM Venture Management, LLC | 1,305,000 | $2.47M | 0.51% | 00.0% | Unchanged |
| Verition Fund Management LLC | 1,303,249 | $2.46M | 0.02% | +1,292,200+11,695.2% | Added |
| Acuta Capital Partners, LLC | 1,200,000 | $2.27M | 1.84% | −463,000−27.8% | Reduced |
| Exome Asset Management LLC | 1,178,570 | $2.23M | 1.51% | +1,178,570 | New |
| Baker Bros. Advisors LP | 1,086,115 | $2.05M | 0.02% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 1,022,455 | $1.93M | 0.00% | −443,125−30.2% | Reduced |
| Jacobs Levy Equity Management, Inc | 993,046 | $1.88M | 0.01% | +507,453+104.5% | Added |
| Octagon Capital Advisors LP | 992,000 | $1.87M | 0.30% | 00.0% | Unchanged |
| Bank of America Corp | 990,036 | $1.87M | 0.00% | +830,263+519.7% | Added |
| Northern Trust Corp | 933,491 | $1.76M | 0.00% | +32,870+3.6% | Added |
| Qube Research & Technologies Ltd | 877,043 | $1.66M | 0.00% | −115,522−11.6% | Reduced |
| Wellington Management Group LLP | 618,305 | $1.17M | 0.00% | +85,439+16.0% | Added |
| UBS Oconnor LLC | 570,029 | $1.08M | 0.03% | +25,736+4.7% | Added |
| HealthInvest Partners AB | 538,621 | $1.02M | 0.48% | +353,721+191.3% | Added |
| Balyasny Asset Management LLC | 535,819 | $1.01M | 0.00% | +535,819 | New |
| ClariVest Asset Management LLC | 500,498 | $1.01M | 0.10% | 00.0% | Unchanged |
| Barclays PLC | 494,516 | $934.6K | 0.00% | +121,799+32.7% | Added |
| Renaissance Technologies LLC | 492,719 | $931.2K | 0.00% | −955,500−66.0% | Reduced |
| Two Sigma Advisers, LP | 486,800 | $920.1K | 0.00% | −232,500−32.3% | Reduced |
| UBS Group AG | 473,527 | $895.0K | 0.00% | +438,544+1,253.6% | Added |
| Woodline Partners LP | 433,552 | $819.4K | 0.01% | −1,033,759−70.5% | Reduced |
| Jane Street Group, LLC | 417,451 | $789.0K | 0.00% | +100,119+31.6% | Added |
| Bank of New York Mellon Corp | 372,173 | $703.4K | 0.00% | −80,656−17.8% | Reduced |
| Prelude Capital Management, LLC | 364,727 | $689.3K | 0.05% | +364,727 | New |
| XTX Topco Ltd | 347,255 | $656.3K | 0.05% | +225,823+186.0% | Added |
| Charles Schwab Investment Management Inc | 312,623 | $590.9K | 0.00% | −70.0% | Reduced |
| Two Sigma Investments, LP | 300,222 | $567.4K | 0.00% | −448,468−59.9% | Reduced |
| FMR LLC | 277,740 | $524.9K | 0.00% | +32,332+13.2% | Added |
| Gsa Capital Partners LLP | 271,774 | $514.0K | 0.04% | +213,814+368.9% | Added |
| Millennium Management LLC | 259,783 | $491.0K | 0.00% | −432,002−62.4% | Reduced |
| BNP Paribas Arbitrage, SA | 237,198 | $448.3K | 0.00% | −98,881−29.4% | Reduced |
| Panagora Asset Management Inc | 233,209 | $440.8K | 0.00% | −3,016−1.3% | Reduced |
| Los Angeles Capital Management LLC | 189,660 | $358.5K | 0.00% | +14,240+8.1% | Added |
| Alliancebernstein L.P. | 186,060 | $351.7K | 0.00% | 00.0% | Unchanged |
| Federated Hermes, Inc. | 183,744 | $347.3K | 0.00% | −1,763−1.0% | Reduced |
| 683 Capital Management, LLC | 182,793 | $345.5K | 0.04% | +182,793 | New |
| Rhumbline Advisers | 166,846 | $315.3K | 0.00% | −9,217−5.2% | Reduced |
| Nuveen Asset Management, LLC | 151,201 | $285.8K | 0.00% | +27,862+22.6% | Added |
| Macquarie Group Ltd | 150,000 | $284.0K | 0.00% | 00.0% | Unchanged |
| Price T Rowe Associates Inc | 99,078 | $188.0K | 0.00% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 87,233 | $165.0K | 0.00% | −51,489−37.1% | Reduced |
| Exchange Traded Concepts, LLC | 85,006 | $160.7K | 0.00% | +41,586+95.8% | Added |
| Susquehanna Portfolio Strategies, LLC | 82,713 | $156.3K | 0.01% | −11,165−11.9% | Reduced |
| Citigroup Inc | 82,312 | $155.6K | 0.00% | +56,746+222.0% | Added |
| Squarepoint Ops LLC | 81,629 | $154.3K | 0.00% | −171,175−67.7% | Reduced |
| Susquehanna International Group, LLP | 74,809 | $141.4K | 0.00% | −34,050−31.3% | Reduced |
| Simplex Trading, LLC | 72,844 | $137.0K | 0.00% | +34,183+88.4% | Added |
| Algert Global LLC | 63,483 | $120.0K | 0.00% | +18,828+42.2% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 63,124 | $119.3K | 0.00% | +6,179+10.9% | Added |
| QVT Financial LP | 62,657 | $118.4K | 0.01% | 00.0% | Unchanged |
| Corebridge Financial, Inc. | 60,655 | $114.6K | 0.00% | −375−0.6% | Reduced |
| Invesco Ltd. | 55,483 | $104.9K | 0.00% | +10,427+23.1% | Added |
| Wells Fargo & Company | 48,115 | $90.9K | 0.00% | +845+1.8% | Added |
| Ameriprise Financial Inc | 45,647 | $86.3K | 0.00% | +100+0.2% | Added |
| Manufacturers Life Insurance Company, The | 44,473 | $84.1K | 0.00% | −2,014−4.3% | Reduced |
| Graham Capital Management, L.P. | 42,417 | $80.2K | 0.00% | −8,553−16.8% | Reduced |
| Voya Investment Management LLC | 38,301 | $72.4K | 0.00% | −287−0.7% | Reduced |
| New York State Common Retirement Fund | 37,235 | $70.4K | 0.00% | 00.0% | Unchanged |
| MetLife Investment Management | 33,916 | $64.1K | 0.00% | −31,667−48.3% | Reduced |
| Group One Trading, L.P. | 32,570 | $61.6K | 0.00% | +9,100+38.8% | Added |
| Walleye Trading LLC | 31,526 | $59.6K | 0.00% | 00.0% | Unchanged |
| Quarry LP | 30,000 | $56.7K | 0.02% | +30,000 | New |
| State Board of Administration of Florida Retirement System | 28,800 | $54.4K | 0.00% | 00.0% | Unchanged |
| Intech Investment Management LLC | 27,342 | $51.7K | 0.00% | +27,342 | New |
| Atom Investors LP | 24,661 | $46.6K | 0.00% | −340,774−93.3% | Reduced |
| Acadian Asset Management LLC | 24,394 | $46.0K | 0.00% | −47,112−65.9% | Reduced |
| Prio Wealth Limited Partnership | 23,529 | $44.5K | 0.00% | 00.0% | Unchanged |
| Jasper Ridge Partners, L.P. | 23,100 | $43.7K | 0.00% | 00.0% | Unchanged |
| ProShare Advisors LLC | 21,435 | $40.5K | 0.00% | +6,585+44.3% | Added |
| Public Employees Retirement System of Ohio | 20,587 | $38.9K | 0.00% | 00.0% | Unchanged |
| Dynamic Technology Lab Private Ltd | 18,095 | $34.0K | 0.00% | +18,095 | New |
| US Bancorp | 16,178 | $30.6K | 0.00% | +16,178 | New |
| Grimes & Company, Inc. | 14,998 | $28.3K | 0.00% | 00.0% | Unchanged |
| HSBC Holdings PLC | 13,965 | $25.7K | 0.00% | +1,439+11.5% | Added |
| Royal Bank of Canada | 11,455 | $22.0K | 0.00% | +785+7.4% | Added |
| Victory Capital Management Inc | 11,458 | $21.7K | 0.00% | −415−3.5% | Reduced |
| Legal & General Group Plc | 11,097 | $21.0K | 0.00% | 00.0% | Unchanged |
| Russell Investments Group, Ltd. | 10,765 | $20.3K | 0.00% | +1,249+13.1% | Added |
| Caption Management, LLC | 10,200 | $19.3K | 0.00% | 00.0% | Unchanged |
| Hunter Perkins Capital Management, LLC | 10,000 | $19.0K | 0.00% | 00.0% | Unchanged |
| Ameritas Investment Partners, Inc. | 9,896 | $18.7K | 0.00% | 00.0% | Unchanged |
| STRS Ohio | 8,700 | $16.4K | 0.00% | 00.0% | Unchanged |
| California State Teachers Retirement System | 8,220 | $15.5K | 0.00% | 00.0% | Unchanged |