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 2023
Institutional positions in Mersana Therapeutics, Inc. as of Sep 30, 2023. 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
- 128
- −19 vs. Q2 2023
- Shares held
- 113.7M
- +1.24M (+1.1%) vs. Q2 2023
- Total value
- $144.4M
- −$225.8M (−61.0%) vs. Q2 2023
- New holders
- 26
- 35 more added
- Sold out
- 45
- 43 more reduced
Compare with Q2 2023: 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 2023
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q2 2023.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| DAFNA Capital Management LLC | 734,038 | $932.2K | 0.29% | −76,807−9.5% | Reduced |
| Decheng Capital Management III (Cayman), LLC | 904,268 | $1.15M | 0.38% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 925,919 | $1.18M | 0.00% | −122,000−11.6% | Reduced |
| Morgan Stanley | 986,017 | $1.25M | 0.00% | +221,506+29.0% | Added |
| Northern Trust Corp | 1,030,586 | $1.31M | 0.00% | −68,515−6.2% | Reduced |
| Altium Capital Management LP | 1,059,136 | $1.35M | 0.78% | +1,059,136 | New |
| Baker Bros. Advisors LP | 1,086,115 | $1.38M | 0.01% | 00.0% | Unchanged |
| Woodline Partners LP | 1,302,000 | $1.65M | 0.02% | +1,302,000 | New |
| 5AM Venture Management, LLC | 1,305,000 | $1.66M | 0.48% | 00.0% | Unchanged |
| Ikarian Capital, LLC | 1,579,770 | $2.01M | 0.74% | +1,529,770+3,059.5% | Added |
| Citadel Advisors LLC | 1,614,723 | $2.05M | 0.00% | +1,614,647+2,124,535.5% | Added |
| Boxer Capital, LLC | 2,000,000 | $2.54M | 0.14% | +1,000,000+100.0% | Added |
| Walleye Capital LLC | 2,021,467 | $2.57M | 0.04% | +1,866,568+1,205.0% | Added |
| Geode Capital Management, LLC | 2,157,665 | $2.74M | 0.00% | +151,983+7.6% | Added |
| Millennium Management LLC | 2,177,650 | $2.77M | 0.00% | +305,733+16.3% | Added |
| Commodore Capital LP | 2,244,378 | $2.85M | 0.33% | +2,244,378 | New |
| State Street Corp | 2,312,742 | $2.94M | 0.00% | −2,592,407−52.9% | Reduced |
| Philosophy Capital Management LLC | 2,342,634 | $2.98M | 0.62% | +2,342,634 | New |
| Affinity Asset Advisors, LLC | 2,850,000 | $3.62M | 1.18% | +2,850,000 | New |
| Rock Springs Capital Management LP | 3,403,133 | $4.32M | 0.12% | 00.0% | Unchanged |
| Silverarc Capital Management, LLC | 5,000,000 | $6.35M | 2.37% | +4,000,000+400.0% | Added |
| Balyasny Asset Management LLC | 5,040,900 | $6.40M | 0.02% | +201,385+4.2% | Added |
| Bellevue Group AG | 5,218,625 | $6.63M | 0.11% | −8000.0% | Reduced |
| Vanguard Group Inc | 6,186,123 | $7.86M | 0.00% | +461,504+8.1% | Added |
| BlackRock Inc. | 7,972,660 | $10.1M | 0.00% | +8,678+0.1% | Added |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $11.0M | 1.23% | 00.0% | Unchanged |
| VR Adviser, LLC | 11,328,000 | $14.4M | 1.51% | +11,328,000 | New |
| EcoR1 Capital, LLC | 19,364,688 | $24.6M | 0.84% | +19,364,688 | New |
| OrbiMed Advisors LLC | 0 | $0 | 0.00% | −7,214,937−100.0% | Sold out |
| Avoro Capital Advisors LLC | 0 | $0 | 0.00% | −6,375,000−100.0% | Sold out |
| Avidity Partners Management LP | 0 | $0 | 0.00% | −3,790,000−100.0% | Sold out |
| Artal Group S.A. | 0 | $0 | 0.00% | −3,029,555−100.0% | Sold out |
| Deerfield Management Company, L.P. (Series C) | 0 | $0 | 0.00% | −2,885,400−100.0% | Sold out |
| Logos Global Management LP | 0 | $0 | 0.00% | −2,800,000−100.0% | Sold out |
| Candriam Luxembourg S.C.A. | 0 | $0 | 0.00% | −2,415,477−100.0% | Sold out |
| Redmile Group, LLC | 0 | $0 | 0.00% | −1,698,626−100.0% | Sold out |
| Hudson Bay Capital Management LP | 0 | $0 | 0.00% | −962,359−100.0% | Sold out |
| RTW Investments, LP | 0 | $0 | 0.00% | −614,838−100.0% | Sold out |
| Ameriprise Financial Inc | 0 | $0 | 0.00% | −572,273−100.0% | Sold out |
| First Manhattan Co | 0 | $0 | 0.00% | −569,594−100.0% | Sold out |
| Readystate Asset Management LP | 0 | $0 | 0.00% | −567,300−100.0% | Sold out |
| Kennedy Capital Management, Inc. | 0 | $0 | 0.00% | −555,279−100.0% | Sold out |
| Adage Capital Partners GP, L.L.C. | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Tri Locum Partners LP | 0 | $0 | 0.00% | −428,307−100.0% | Sold out |
| Sphera Funds Management Ltd. | 0 | $0 | 0.00% | −418,562−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −418,224−100.0% | Sold out |
| Rafferty Asset Management, LLC | 0 | $0 | 0.00% | −336,656−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −320,540−100.0% | Sold out |
| Algert Global LLC | 0 | $0 | 0.00% | −219,846−100.0% | Sold out |
| Qube Research & Technologies Ltd | 0 | $0 | 0.00% | −204,106−100.0% | Sold out |
| Caption Management, LLC | 0 | $0 | 0.00% | −181,000−100.0% | Sold out |
| Nomura Holdings Inc | 0 | $0 | 0.00% | −148,979−100.0% | Sold out |
| Skandinaviska Enskilda Banken AB (publ) | 0 | $0 | 0.00% | −93,132−100.0% | Sold out |
| Profund Advisors LLC | 0 | $0 | 0.00% | −61,786−100.0% | Sold out |
| Thrivent Financial for Lutherans | 0 | $0 | 0.00% | −58,073−100.0% | Sold out |
| Mirae Asset Global Investments Co., Ltd. | 0 | $0 | 0.00% | −57,099−100.0% | Sold out |
| Jefferies Financial Group Inc. | 0 | $0 | 0.00% | −39,975−100.0% | Sold out |
| Corton Capital Inc. | 0 | $0 | 0.00% | −32,937−100.0% | Sold out |
| State Board of Administration of Florida Retirement System | 0 | $0 | 0.00% | −28,482−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −22,392−100.0% | Sold out |
| E Fund Management Co., Ltd. | 0 | $0 | 0.00% | −18,105−100.0% | Sold out |
| Delphia (USA) Inc. | 0 | $0 | 0.00% | −16,992−100.0% | Sold out |
| Mirabella Financial Services LLP | 0 | $0 | 0.00% | −14,472−100.0% | Sold out |
| Tocqueville Asset Management L.P. | 0 | $0 | 0.00% | −13,000−100.0% | Sold out |
| Dynamic Technology Lab Private Ltd | 0 | $0 | 0.00% | −12,869−100.0% | Sold out |
| Martingale Asset Management L P | 0 | $0 | 0.00% | −12,114−100.0% | Sold out |
| Belvedere Trading LLC | 0 | $0 | 0.00% | −8,081−100.0% | Sold out |
| PEAK6 Investments LLC | 0 | $0 | 0.00% | −5,000−100.0% | Sold out |
| Allspring Global Investments Holdings, LLC | 0 | $0 | 0.00% | −4,681−100.0% | Sold out |
| GWM Advisors LLC | 0 | $0 | 0.00% | −500−100.0% | Sold out |
| Signaturefd, LLC | 0 | $0 | 0.00% | −369−100.0% | Sold out |
| Parallel Advisors, LLC | 0 | $0 | 0.00% | −78−100.0% | Sold out |
| US Bancorp | 0 | $0 | 0.00% | −53−100.0% | Sold out |