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 2025
Institutional positions in Mersana Therapeutics, Inc. as of Dec 31, 2025. 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
MRSN is no longer listed, so this page shows Q4 2025. 13F filings for later quarters list far fewer holders.
- Institutional holders
- 51
- +2 vs. Q3 2025
- Shares held
- 2.24M
- −939.5K (−29.5%) vs. Q3 2025
- Total value
- $64.8M
- +$40.1M (+162.4%) vs. Q3 2025
- New holders
- 18
- 3 more added
- Sold out
- 16
- 24 more reduced
Compare with Q3 2025: 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 2025
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Danske Bank A/S | 1 | $29 | 0.00% | 00.0% | Unchanged |
| IFP Advisors, Inc | 3 | $87 | 0.00% | −612−99.5% | Reduced |
| North Star Investment Management Corp. | 6 | $174 | 0.00% | 00.0% | Unchanged |
| FMR LLC | 8 | $231 | 0.00% | −4,856−99.8% | Reduced |
| EverSource Wealth Advisors, LLC | 11 | $318 | 0.00% | −3−21.4% | Reduced |
| SHP Wealth Management | 25 | $723 | 0.00% | +25 | New |
| Huntington National Bank | 32 | $926 | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 40 | $1.16K | 0.00% | −1,200−96.8% | Reduced |
| SBI Securities Co., Ltd. | 53 | $1.53K | 0.00% | −1−1.9% | Reduced |
| Flagship Harbor Advisors, LLC | 76 | $2.20K | 0.00% | +76 | New |
| Essential Partners LLC | 82 | $2.37K | 0.00% | −34−29.3% | Reduced |
| Lion Point Capital, LP | 100 | $2.89K | 0.01% | −25,660−99.6% | Reduced |
| Advisor Group Holdings, Inc. | 103 | $2.98K | 0.00% | −2,500−96.0% | Reduced |
| JPMorgan Chase & Co | 112 | $3.24K | 0.00% | −5,996−98.2% | Reduced |
| Royal Bank of Canada | 168 | $5.00K | 0.00% | −524−75.7% | Reduced |
| UBS Group AG | 221 | $6.39K | 0.00% | −8,388−97.4% | Reduced |
| Tower Research Capital LLC (TRC) | 376 | $10.9K | 0.00% | −1,186−75.9% | Reduced |
| Mint Tower Capital Management B.V. | 1,035 | $30.0K | 0.00% | +1,035 | New |
| Group One Trading, L.P. | 1,073 | $31.0K | 0.00% | +112+11.7% | Added |
| BNP Paribas Arbitrage, SA | 1,090 | $31.5K | 0.00% | +559+105.3% | Added |
| CWM, LLC | 2,286 | $66.0K | 0.00% | −3,470−60.3% | Reduced |
| Equitec Proprietary Markets, LLC | 5,593 | $161.8K | 0.78% | +5,593 | New |
| Omers Administration Corp | 7,900 | $228.5K | 0.00% | +7,900 | New |
| Northern Trust Corp | 8,586 | $248.4K | 0.00% | +8,586 | New |
| Gamco Investors, Inc. Et Al | 10,000 | $289.3K | 0.00% | +10,000 | New |
| Point72 Asset Management, L.P. | 10,364 | $299.8K | 0.00% | +10,364 | New |
| XTX Topco Ltd | 11,948 | $345.7K | 0.01% | +11,948 | New |
| Ieq Capital, LLC | 12,955 | $374.8K | 0.00% | −2,285−15.0% | Reduced |
| Knott David M Jr | 111,686 | $437.8K | 0.20% | +111,686 | New |
| Deltec Asset Management LLC | 18,000 | $520.7K | 0.09% | +18,000 | New |
| Morgan Stanley | 18,496 | $535.1K | 0.00% | −29,831−61.7% | Reduced |
| State Street Corp | 19,543 | $565.4K | 0.00% | −10,300−34.5% | Reduced |
| Citadel Advisors LLC | 22,493 | $650.7K | 0.00% | +22,493 | New |
| Yakira Capital Management, Inc. | 32,663 | $944.9K | 0.32% | +32,663 | New |
| Mackenzie Financial Corp | 33,834 | $967.4K | 0.00% | −13,985−29.2% | Reduced |
| AQR Capital Management LLC | 37,264 | $1.08M | 0.00% | −9,456−20.2% | Reduced |
| Credit Industriel Et Commercial | 41,392 | $1.20M | 0.17% | +41,392 | New |
| Geode Capital Management, LLC | 43,920 | $1.27M | 0.00% | +2,272+5.5% | Added |
| Gabelli Funds LLC | 47,300 | $1.37M | 0.01% | +47,300 | New |
| Rangeley Capital, LLC | 57,098 | $1.65M | 1.42% | +57,098 | New |
| Groupe la Francaise | 61,488 | $1.78M | 0.03% | +61,488 | New |
| Millennium Management LLC | 63,305 | $1.83M | 0.00% | −14,684−18.8% | Reduced |
| Bank of America Corp | 65,749 | $1.90M | 0.00% | −648−1.0% | Reduced |
| BlackRock, Inc. | 69,210 | $2.00M | 0.00% | −26,983−28.1% | Reduced |
| Affinity Asset Advisors, LLC | 100,000 | $2.89M | 0.21% | +100,000 | New |
| Acadian Asset Management LLC | 110,882 | $3.21M | 0.01% | −31,478−22.1% | Reduced |
| Alamea Verwaltungs GmbH | 24,165 | $3.34M | 2.25% | −405,860−94.4% | Reduced |
| Rock Springs Capital Management LP | 152,586 | $4.41M | 0.23% | 00.0% | Unchanged |
| Vanguard Group Inc | 210,301 | $6.08M | 0.00% | −92,252−30.5% | Reduced |
| Bain Capital Life Sciences Investors, LLC | 346,545 | $10.0M | 0.77% | 00.0% | Unchanged |
| Nextech Invest, Ltd. | 482,689 | $14.0M | 1.35% | 00.0% | Unchanged |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −273,579−100.0% | Sold out |
| Silverarc Capital Management, LLC | 0 | $0 | 0.00% | −133,636−100.0% | Sold out |
| 683 Capital Management, LLC | 0 | $0 | 0.00% | −100,000−100.0% | Sold out |
| Renaissance Technologies LLC | 0 | $0 | 0.00% | −88,465−100.0% | Sold out |
| 5AM Venture Management, LLC | 0 | $0 | 0.00% | −52,200−100.0% | Sold out |
| Luminus Management LLC | 0 | $0 | 0.00% | −50,000−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −40,640−100.0% | Sold out |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −30,688−100.0% | Sold out |
| DRW Securities, LLC | 0 | $0 | 0.00% | −13,851−100.0% | Sold out |
| Voleon Capital Management LP | 0 | $0 | 0.00% | −13,200−100.0% | Sold out |
| China Universal Asset Management Co., Ltd. | 0 | $0 | 0.00% | −875−100.0% | Sold out |
| Barclays PLC | 0 | $0 | 0.00% | −198−100.0% | Sold out |
| Mirae Asset Global Investments Co., Ltd. | 0 | $0 | 0.00% | −193−100.0% | Sold out |
| SRS Capital Advisors, Inc. | 0 | $0 | 0.00% | −157−100.0% | Sold out |
| Citigroup Inc | 0 | $0 | 0.00% | −106−100.0% | Sold out |
| GF Fund Management Co. Ltd. | 0 | $0 | 0.00% | −94−100.0% | Sold out |