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, Q4 2024
Institutional positions in Mersana Therapeutics, Inc. as of Dec 31, 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
- 132
- +18 vs. Q3 2024
- Shares held
- 104.3M
- −11.3M (−9.7%) vs. Q3 2024
- Total value
- $149.2M
- −$69.2M (−31.7%) vs. Q3 2024
- New holders
- 30
- 33 more added
- Sold out
- 12
- 40 more reduced
2 institutions that held it in Q3 2024 haven't filed for Q4 2024 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 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, Q4 2024
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q3 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Nextech Invest AG | 12,067,246 | $17.3M | 2.80% | 00.0% | Unchanged |
| EcoR1 Capital, LLC | 11,328,000 | $16.2M | 0.65% | −8,036,688−41.5% | Reduced |
| VR Adviser, LLC | 10,257,790 | $14.7M | 1.01% | −1,070,210−9.4% | Reduced |
| BlackRock, Inc. | 9,205,182 | $13.2M | 0.00% | +583,321+6.8% | Added |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $12.4M | 1.46% | 00.0% | Unchanged |
| Vanguard Group Inc | 7,057,516 | $10.1M | 0.00% | −119,942−1.7% | Reduced |
| Novo Holdings A/S | 4,250,000 | $6.08M | 0.37% | +4,250,000 | New |
| Rock Springs Capital Management LP | 3,431,684 | $4.91M | 0.19% | +384,902+12.6% | Added |
| State Street Corp | 2,764,895 | $3.95M | 0.00% | +39,501+1.4% | Added |
| Boxer Capital Management, LLC | 2,635,000 | $3.77M | 0.32% | +2,635,000 | New |
| JPMorgan Chase & Co | 2,534,447 | $3.62M | 0.00% | +183,088+7.8% | Added |
| Geode Capital Management, LLC | 2,442,250 | $3.49M | 0.00% | +29,035+1.2% | Added |
| Schonfeld Strategic Advisors LLC | 2,119,586 | $3.03M | 0.02% | −103,722−4.7% | Reduced |
| Catalio Capital Management, LP | 1,705,036 | $2.44M | 0.53% | +1,705,036 | New |
| 5AM Venture Management, LLC | 1,305,000 | $1.87M | 0.45% | 00.0% | Unchanged |
| Morgan Stanley | 1,203,356 | $1.72M | 0.00% | −160,860−11.8% | Reduced |
| Acuta Capital Partners, LLC | 1,120,500 | $1.60M | 1.61% | −79,500−6.6% | Reduced |
| Jacobs Levy Equity Management, Inc | 1,111,998 | $1.59M | 0.01% | +118,952+12.0% | Added |
| Baker Bros. Advisors LP | 1,086,115 | $1.55M | 0.02% | 00.0% | Unchanged |
| Octagon Capital Advisors LP | 992,000 | $1.42M | 0.24% | 00.0% | Unchanged |
| Bank of America Corp | 953,952 | $1.36M | 0.00% | −36,084−3.6% | Reduced |
| Northern Trust Corp | 929,708 | $1.33M | 0.00% | −3,783−0.4% | Reduced |
| 683 Capital Management, LLC | 900,000 | $1.29M | 0.13% | +717,207+392.4% | Added |
| Deutsche Bank AG | 839,724 | $1.20M | 0.00% | −756,449−47.4% | Reduced |
| Goldman Sachs Group Inc | 802,366 | $1.15M | 0.00% | −1,156,870−59.0% | Reduced |
| Millennium Management LLC | 795,973 | $1.14M | 0.00% | +536,190+206.4% | Added |
| Sphera Funds Management Ltd. | 690,272 | $987.1K | 0.18% | +690,272 | New |
| Renaissance Technologies LLC | 606,285 | $867.0K | 0.00% | +113,566+23.0% | Added |
| Wellington Management Group LLP | 576,148 | $823.9K | 0.00% | −42,157−6.8% | Reduced |
| D. E. Shaw & Co., Inc. | 544,463 | $778.6K | 0.00% | −477,992−46.7% | Reduced |
| HealthInvest Partners AB | 538,621 | $764.8K | 0.36% | 00.0% | Unchanged |
| Gsa Capital Partners LLP | 508,296 | $727.0K | 0.05% | +236,522+87.0% | Added |
| Two Sigma Advisers, LP | 448,000 | $640.6K | 0.00% | −38,800−8.0% | Reduced |
| Woodline Partners LP | 435,593 | $622.9K | 0.00% | +2,041+0.5% | Added |
| Citadel Advisors LLC | 421,360 | $602.5K | 0.00% | −3,990,195−90.4% | Reduced |
| UBS Oconnor LLC | 410,029 | $586.3K | 0.01% | −160,000−28.1% | Reduced |
| BNP Paribas Arbitrage, SA | 361,147 | $516.4K | 0.00% | +123,949+52.3% | Added |
| Qube Research & Technologies Ltd | 347,415 | $496.8K | 0.00% | −529,628−60.4% | Reduced |
| Bank of New York Mellon Corp | 346,189 | $495.1K | 0.00% | −25,984−7.0% | Reduced |
| Verition Fund Management LLC | 336,806 | $481.6K | 0.00% | −966,443−74.2% | Reduced |
| Charles Schwab Investment Management Inc | 312,623 | $447.1K | 0.00% | 00.0% | Unchanged |
| FMR LLC | 299,324 | $428.0K | 0.00% | +21,584+7.8% | Added |
| Panagora Asset Management Inc | 239,685 | $342.8K | 0.00% | +6,476+2.8% | Added |
| Nuveen Asset Management, LLC | 232,223 | $332.1K | 0.00% | +81,022+53.6% | Added |
| Two Sigma Investments, LP | 210,876 | $301.6K | 0.00% | −89,346−29.8% | Reduced |
| ExodusPoint Capital Management, LP | 194,153 | $278.0K | 0.00% | +194,153 | New |
| Alliancebernstein L.P. | 186,060 | $266.1K | 0.00% | 00.0% | Unchanged |
| Federated Hermes, Inc. | 183,723 | $262.7K | 0.00% | −210.0% | Reduced |
| Barclays PLC | 182,711 | $261.3K | 0.00% | −311,805−63.1% | Reduced |
| Exome Asset Management LLC | 172,924 | $249.7K | 0.19% | −1,005,646−85.3% | Reduced |
| Rhumbline Advisers | 171,857 | $245.7K | 0.00% | +5,011+3.0% | Added |
| UBS Group AG | 162,264 | $232.0K | 0.00% | −311,263−65.7% | Reduced |
| Los Angeles Capital Management LLC | 159,760 | $228.5K | 0.00% | −29,900−15.8% | Reduced |
| Jane Street Group, LLC | 151,526 | $216.7K | 0.00% | −265,925−63.7% | Reduced |
| Macquarie Group Ltd | 150,000 | $215.0K | 0.00% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 112,291 | $161.0K | 0.00% | +25,058+28.7% | Added |
| Citigroup Inc | 97,831 | $139.9K | 0.00% | +15,519+18.9% | Added |
| Mackenzie Financial Corp | 91,956 | $131.5K | 0.00% | +91,956 | New |
| Susquehanna Fundamental Investments, LLC | 91,852 | $131.3K | 0.00% | +91,852 | New |
| Exchange Traded Concepts, LLC | 85,006 | $121.6K | 0.00% | 00.0% | Unchanged |
| MetLife Investment Management | 73,150 | $104.6K | 0.00% | +39,234+115.7% | Added |
| SEI Investments Co | 69,527 | $99.4K | 0.00% | +69,527 | New |
| Wells Fargo & Company | 67,483 | $96.5K | 0.00% | +19,368+40.3% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 65,936 | $94.3K | 0.00% | +2,812+4.5% | Added |
| Oxford Asset Management LLP | 65,386 | $93.5K | 0.04% | +65,386 | New |
| XTX Topco Ltd | 63,530 | $90.8K | 0.01% | −283,725−81.7% | Reduced |
| QVT Financial LP | 62,657 | $89.6K | 0.01% | 00.0% | Unchanged |
| Price T Rowe Associates Inc | 62,093 | $89.0K | 0.00% | −36,985−37.3% | Reduced |
| Algert Global LLC | 60,083 | $85.9K | 0.00% | −3,400−5.4% | Reduced |
| Corebridge Financial, Inc. | 56,398 | $80.6K | 0.00% | −4,257−7.0% | Reduced |
| Avanza Fonder AB | 56,298 | $80.5K | 0.00% | +56,298 | New |
| Invesco Ltd. | 54,872 | $78.5K | 0.00% | −611−1.1% | Reduced |
| Ameriprise Financial Inc | 53,329 | $76.3K | 0.00% | +7,682+16.8% | Added |
| Group One Trading, L.P. | 52,283 | $74.8K | 0.00% | +19,713+60.5% | Added |
| Prelude Capital Management, LLC | 51,357 | $73.4K | 0.01% | −313,370−85.9% | Reduced |
| Intech Investment Management LLC | 51,028 | $73.0K | 0.00% | +23,686+86.6% | Added |
| Susquehanna International Group, LLP | 49,853 | $71.3K | 0.00% | −24,956−33.4% | Reduced |
| Graham Capital Management, L.P. | 49,724 | $71.1K | 0.00% | +7,307+17.2% | Added |
| Cubist Systematic Strategies, LLC | 45,296 | $64.8K | 0.00% | +45,296 | New |
| Manufacturers Life Insurance Company, The | 43,990 | $62.9K | 0.00% | −483−1.1% | Reduced |
| ProShare Advisors LLC | 37,799 | $54.1K | 0.00% | +16,364+76.3% | Added |
| New York State Common Retirement Fund | 37,235 | $53.2K | 0.00% | 00.0% | Unchanged |
| Voya Investment Management LLC | 36,190 | $51.8K | 0.00% | −2,111−5.5% | Reduced |
| Walleye Trading LLC | 31,526 | $45.1K | 0.00% | 00.0% | Unchanged |
| State Board of Administration of Florida Retirement System | 28,800 | $41.2K | 0.00% | 00.0% | Unchanged |
| Atom Investors LP | 26,563 | $38.0K | 0.00% | +1,902+7.7% | Added |
| China Universal Asset Management Co., Ltd. | 26,194 | $37.5K | 0.00% | +26,194 | New |
| Quarry LP | 24,000 | $34.3K | 0.01% | −6,000−20.0% | Reduced |
| Jasper Ridge Partners, L.P. | 23,100 | $33.0K | 0.00% | 00.0% | Unchanged |
| Police & Firemen's Retirement System of New Jersey | 22,593 | $32.3K | 0.00% | +22,593 | New |
| Public Employees Retirement System of Ohio | 20,587 | $29.4K | 0.00% | 00.0% | Unchanged |
| Engineers Gate Manager LP | 17,084 | $24.4K | 0.00% | +17,084 | New |
| US Bancorp | 16,178 | $23.1K | 0.00% | 00.0% | Unchanged |
| Marshall Wace, LLP | 15,600 | $22.3K | 0.00% | +15,600 | New |
| Grimes & Company, Inc. | 14,998 | $21.4K | 0.00% | 00.0% | Unchanged |
| Aquatic Capital Management LLC | 14,551 | $20.8K | 0.00% | +14,551 | New |
| HSBC Holdings PLC | 13,301 | $18.3K | 0.00% | −664−4.8% | Reduced |
| Bayesian Capital Management, LP | 12,600 | $18.0K | 0.00% | +12,600 | New |
| Squarepoint Ops LLC | 12,104 | $17.3K | 0.00% | −69,525−85.2% | Reduced |
| Lazard Asset Management LLC | 12,104 | $17.0K | 0.00% | +12,104 | New |