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, Q1 2025
Institutional positions in Mersana Therapeutics, Inc. as of Mar 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
- Institutional holders
- 111
- −19 vs. Q4 2024
- Shares held
- 87.8M
- −4.16M (−4.5%) vs. Q4 2024
- Total value
- $30.2M
- −$101.3M (−77.0%) vs. Q4 2024
- New holders
- 31
- 23 more added
- Sold out
- 50
- 32 more reduced
2 institutions that held it in Q4 2024 haven't filed for Q1 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 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, Q1 2025
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q4 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Nextech Invest, Ltd. | 12,067,246 | $4.15M | 0.97% | +12,067,246 | New |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $2.98M | 0.44% | 00.0% | Unchanged |
| Vanguard Group Inc | 8,377,767 | $2.88M | 0.00% | +1,320,251+18.7% | Added |
| BlackRock, Inc. | 8,326,182 | $2.87M | 0.00% | −879,000−9.5% | Reduced |
| Schonfeld Strategic Advisors LLC | 7,614,064 | $2.62M | 0.02% | +5,494,478+259.2% | Added |
| AQR Capital Management LLC | 5,143,749 | $1.77M | 0.00% | +5,143,749 | New |
| Rock Springs Capital Management LP | 3,814,684 | $1.31M | 0.08% | +383,000+11.2% | Added |
| VR Adviser, LLC | 3,574,325 | $1.23M | 0.10% | −6,683,465−65.2% | Reduced |
| Silverarc Capital Management, LLC | 3,088,505 | $1.06M | 0.22% | +3,088,505 | New |
| Acadian Asset Management LLC | 2,989,659 | $1.03M | 0.00% | +2,989,659 | New |
| State Street Corp | 2,603,868 | $896.3K | 0.00% | −161,027−5.8% | Reduced |
| Geode Capital Management, LLC | 2,442,328 | $840.8K | 0.00% | +780.0% | Added |
| Catalio Capital Management, LP | 1,705,036 | $586.9K | 0.15% | 00.0% | Unchanged |
| 683 Capital Management, LLC | 1,650,000 | $567.9K | 0.06% | +750,000+83.3% | Added |
| Jacobs Levy Equity Management, Inc | 1,333,124 | $458.9K | 0.00% | +221,126+19.9% | Added |
| 5AM Venture Management, LLC | 1,305,000 | $449.2K | 0.17% | 00.0% | Unchanged |
| Qube Research & Technologies Ltd | 1,174,597 | $404.3K | 0.00% | +827,182+238.1% | Added |
| Northern Trust Corp | 864,787 | $297.7K | 0.00% | −64,921−7.0% | Reduced |
| Renaissance Technologies LLC | 839,919 | $289.1K | 0.00% | +233,634+38.5% | Added |
| Deutsche Bank AG | 839,724 | $285.5K | 0.00% | 00.0% | Unchanged |
| Ieq Capital, LLC | 707,021 | $243.4K | 0.00% | +707,021 | New |
| Lion Point Capital, LP | 644,000 | $221.7K | 1.41% | +644,000 | New |
| Alamea Verwaltungs GmbH | 604,213 | $207.8K | 0.18% | +604,213 | New |
| Goldman Sachs Group Inc | 586,658 | $201.9K | 0.00% | −215,708−26.9% | Reduced |
| Woodline Partners LP | 435,593 | $149.9K | 0.00% | 00.0% | Unchanged |
| Panagora Asset Management Inc | 370,448 | $127.5K | 0.00% | +130,763+54.6% | Added |
| Bank of New York Mellon Corp | 346,188 | $119.2K | 0.00% | −10.0% | Reduced |
| UBS Group AG | 319,805 | $110.0K | 0.00% | +157,541+97.1% | Added |
| Bank of America Corp | 314,371 | $108.1K | 0.00% | −639,581−67.0% | Reduced |
| Morgan Stanley | 307,130 | $105.7K | 0.00% | −896,226−74.5% | Reduced |
| State of Wyoming | 295,498 | $101.7K | 0.01% | +295,498 | New |
| Charles Schwab Investment Management Inc | 280,631 | $96.6K | 0.00% | −31,992−10.2% | Reduced |
| Two Sigma Advisers, LP | 258,200 | $88.9K | 0.00% | −189,800−42.4% | Reduced |
| Cerity Partners LLC | 244,235 | $84.1K | 0.00% | +244,235 | New |
| Susquehanna International Group, LLP | 241,073 | $83.0K | 0.00% | +191,220+383.6% | Added |
| Nuveen, LLC | 232,223 | $79.9K | 0.00% | +232,223 | New |
| BNP Paribas Arbitrage, SA | 201,448 | $69.3K | 0.00% | −159,699−44.2% | Reduced |
| Alliancebernstein L.P. | 186,060 | $64.0K | 0.00% | 00.0% | Unchanged |
| CWM, LLC | 184,825 | $64.0K | 0.00% | +184,645+102,580.6% | Added |
| FMR LLC | 171,080 | $58.9K | 0.00% | −128,244−42.8% | Reduced |
| Rhumbline Advisers | 154,163 | $53.0K | 0.00% | −17,694−10.3% | Reduced |
| Macquarie Group Ltd | 150,000 | $52.0K | 0.00% | 00.0% | Unchanged |
| Algert Global LLC | 135,013 | $46.5K | 0.00% | +74,930+124.7% | Added |
| Wealth Enhancement Advisory Services, LLC | 130,700 | $45.0K | 0.00% | +130,700 | New |
| Barclays PLC | 121,725 | $41.9K | 0.00% | −60,986−33.4% | Reduced |
| Invesco Ltd. | 114,863 | $39.5K | 0.00% | +59,991+109.3% | Added |
| UBS Oconnor LLC | 97,731 | $33.6K | 0.00% | −312,298−76.2% | Reduced |
| Pallas Capital Advisors LLC | 94,531 | $32.5K | 0.00% | +94,531 | New |
| Intech Investment Management LLC | 90,358 | $31.1K | 0.00% | +39,330+77.1% | Added |
| Citigroup Inc | 81,625 | $28.1K | 0.00% | −16,206−16.6% | Reduced |
| Wells Fargo & Company | 78,488 | $27.0K | 0.00% | +11,005+16.3% | Added |
| SEI Investments Co | 69,527 | $23.9K | 0.00% | 00.0% | Unchanged |
| Mirae Asset Global ETFs Holdings Ltd. | 68,760 | $23.7K | 0.00% | +2,824+4.3% | Added |
| Price T Rowe Associates Inc | 62,093 | $22.0K | 0.00% | 00.0% | Unchanged |
| QVT Financial LP | 62,657 | $21.6K | 0.00% | 00.0% | Unchanged |
| Prudential Financial Inc | 61,535 | $21.2K | 0.00% | +61,535 | New |
| Two Sigma Investments, LP | 53,652 | $18.5K | 0.00% | −157,224−74.6% | Reduced |
| Corebridge Financial, Inc. | 52,526 | $18.1K | 0.00% | −3,872−6.9% | Reduced |
| JPMorgan Chase & Co | 50,704 | $17.5K | 0.00% | −2,483,743−98.0% | Reduced |
| HRT Financial LP | 46,497 | $16.0K | 0.00% | +46,497 | New |
| JustInvest LLC | 42,638 | $14.7K | 0.00% | +42,638 | New |
| Merit Financial Group, LLC | 41,904 | $14.4K | 0.00% | +41,904 | New |
| New York State Common Retirement Fund | 37,235 | $12.8K | 0.00% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 35,527 | $12.0K | 0.00% | −76,764−68.4% | Reduced |
| Walleye Trading LLC | 31,526 | $10.9K | 0.00% | 00.0% | Unchanged |
| Captrust Financial Advisors | 31,134 | $10.7K | 0.00% | +31,134 | New |
| Colony Group, LLC | 30,529 | $10.5K | 0.00% | +30,529 | New |
| State Board of Administration of Florida Retirement System | 28,800 | $9.91K | 0.00% | 00.0% | Unchanged |
| ProShare Advisors LLC | 28,784 | $9.91K | 0.00% | −9,015−23.8% | Reduced |
| Tower Research Capital LLC (TRC) | 26,165 | $9.01K | 0.00% | +17,206+192.1% | Added |
| China Universal Asset Management Co., Ltd. | 24,779 | $8.53K | 0.00% | −1,415−5.4% | Reduced |
| Mercer Global Advisors Inc | 24,077 | $8.29K | 0.00% | +24,077 | New |
| CIBC World Markets Corp | 23,791 | $8.19K | 0.00% | +13,175+124.1% | Added |
| Jasper Ridge Partners, L.P. | 23,100 | $7.95K | 0.00% | 00.0% | Unchanged |
| Police & Firemen's Retirement System of New Jersey | 22,593 | $7.78K | 0.00% | 00.0% | Unchanged |
| Mariner, LLC | 20,750 | $7.14K | 0.00% | +20,750 | New |
| Group One Trading, L.P. | 20,100 | $6.92K | 0.00% | −32,183−61.6% | Reduced |
| Buckingham Strategic Partners | 19,485 | $6.71K | 0.00% | +19,485 | New |
| Manufacturers Life Insurance Company, The | 17,374 | $5.98K | 0.00% | −26,616−60.5% | Reduced |
| NorthCrest Asset Manangement, LLC | 16,069 | $5.53K | 0.00% | +16,069 | New |
| Parcion Private Wealth LLC | 15,292 | $5.26K | 0.00% | +15,292 | New |
| Grimes & Company, Inc. | 14,069 | $4.84K | 0.00% | −929−6.2% | Reduced |
| Abel Hall, LLC | 13,662 | $4.70K | 0.00% | +13,662 | New |
| HSBC Holdings PLC | 12,494 | $4.38K | 0.00% | −807−6.1% | Reduced |
| Legal & General Group Plc | 11,097 | $3.82K | 0.00% | 00.0% | Unchanged |
| Principal Financial Group Inc | 10,354 | $3.56K | 0.00% | +10,354 | New |
| Victory Capital Management Inc | 10,339 | $3.56K | 0.00% | −368−3.4% | Reduced |
| Voya Investment Management LLC | 10,123 | $3.48K | 0.00% | −26,067−72.0% | Reduced |
| Ameritas Investment Partners, Inc. | 9,896 | $3.41K | 0.00% | 00.0% | Unchanged |
| Hunter Perkins Capital Management, LLC | 10,000 | $3.00K | 0.00% | 00.0% | Unchanged |
| STRS Ohio | 8,700 | $3.00K | 0.00% | 00.0% | Unchanged |
| California State Teachers Retirement System | 8,220 | $2.83K | 0.00% | 00.0% | Unchanged |
| Mirae Asset Global Investments Co., Ltd. | 4,134 | $1.57K | 0.00% | +17+0.4% | Added |
| The PNC Financial Services Group, Inc. | 3,537 | $1.22K | 0.00% | +3,337+1,668.5% | Added |
| Advisor Group Holdings, Inc. | 3,334 | $1.13K | 0.00% | −98−2.9% | Reduced |
| Amalgamated Bank | 3,769 | $1.00K | 0.00% | 00.0% | Unchanged |
| Simplex Trading, LLC | 3,424 | $1.00K | 0.00% | +3,424 | New |
| EverSource Wealth Advisors, LLC | 2,698 | $929 | 0.00% | +2,698 | New |
| GF Fund Management Co. Ltd. | 2,594 | $893 | 0.00% | 00.0% | Unchanged |
| Optiver Holding B.V. | 2,312 | $796 | 0.00% | +1,607+227.9% | Added |