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, Q2 2024
Institutional positions in Mersana Therapeutics, Inc. as of Jun 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
- 122
- −3 vs. Q1 2024
- Shares held
- 114.2M
- −3.29M (−2.8%) vs. Q1 2024
- Total value
- $229.6M
- −$296.8M (−56.4%) vs. Q1 2024
- New holders
- 19
- 45 more added
- Sold out
- 22
- 36 more reduced
Compare with Q1 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, Q2 2024
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q1 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 19,364,688 | $38.9M | 1.19% | 00.0% | Unchanged |
| VR Adviser, LLC | 11,328,000 | $22.8M | 1.45% | 00.0% | Unchanged |
| Nextech Invest AG | 9,526,146 | $19.1M | 3.22% | +5,669,825+147.0% | Added |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $17.4M | 1.91% | 00.0% | Unchanged |
| BlackRock Inc. | 8,383,910 | $16.9M | 0.00% | +288,181+3.6% | Added |
| Vanguard Group Inc | 6,702,521 | $13.5M | 0.00% | +428,151+6.8% | Added |
| Rock Springs Capital Management LP | 3,046,782 | $6.12M | 0.18% | 00.0% | Unchanged |
| Schonfeld Strategic Advisors LLC | 2,976,918 | $5.98M | 0.05% | +1,968,260+195.1% | Added |
| Citadel Advisors LLC | 2,743,599 | $5.51M | 0.01% | −715,386−20.7% | Reduced |
| State Street Corp | 2,682,055 | $5.39M | 0.00% | −2,815,388−51.2% | Reduced |
| Cormorant Asset Management, LP | 2,600,000 | $5.23M | 0.30% | 00.0% | Unchanged |
| Silverarc Capital Management, LLC | 2,500,585 | $5.03M | 1.24% | −468,213−15.8% | Reduced |
| Geode Capital Management, LLC | 2,493,423 | $5.01M | 0.00% | +135,202+5.7% | Added |
| Morgan Stanley | 2,272,594 | $4.57M | 0.00% | −670,083−22.8% | Reduced |
| JPMorgan Chase & Co | 1,976,899 | $3.97M | 0.00% | +549,559+38.5% | Added |
| Acuta Capital Partners, LLC | 1,663,000 | $3.34M | 2.82% | −501,628−23.2% | Reduced |
| Deutsche Bank AG | 1,576,000 | $3.17M | 0.00% | −9,263−0.6% | Reduced |
| Woodline Partners LP | 1,467,311 | $2.95M | 0.03% | −1,467,311−50.0% | Reduced |
| D. E. Shaw & Co., Inc. | 1,465,580 | $2.95M | 0.00% | +242,957+19.9% | Added |
| Renaissance Technologies LLC | 1,448,219 | $2.91M | 0.00% | +20,400+1.4% | Added |
| 5AM Venture Management, LLC | 1,305,000 | $2.62M | 0.59% | 00.0% | Unchanged |
| Goldman Sachs Group Inc | 1,244,937 | $2.50M | 0.00% | +572,330+85.1% | Added |
| Baker Bros. Advisors LP | 1,086,115 | $2.18M | 0.03% | 00.0% | Unchanged |
| Qube Research & Technologies Ltd | 992,565 | $2.00M | 0.00% | +32,870+3.4% | Added |
| Octagon Capital Advisors LP | 992,000 | $1.99M | 0.33% | −8,000−0.8% | Reduced |
| Northern Trust Corp | 900,621 | $1.81M | 0.00% | −44,550−4.7% | Reduced |
| Affinity Asset Advisors, LLC | 767,000 | $1.54M | 0.24% | −233,000−23.3% | Reduced |
| Two Sigma Investments, LP | 748,690 | $1.50M | 0.00% | +530,745+243.5% | Added |
| Two Sigma Advisers, LP | 719,300 | $1.45M | 0.00% | +563,500+361.7% | Added |
| Millennium Management LLC | 691,785 | $1.39M | 0.00% | −815,795−54.1% | Reduced |
| UBS Oconnor LLC | 544,293 | $1.09M | 0.03% | +110,000+25.3% | Added |
| Wellington Management Group LLP | 532,866 | $1.07M | 0.00% | −1,752−0.3% | Reduced |
| ClariVest Asset Management LLC | 500,498 | $1.01M | 0.10% | +28,650+6.1% | Added |
| Jacobs Levy Equity Management, Inc | 485,593 | $976.0K | 0.00% | −324,286−40.0% | Reduced |
| Bridgeway Capital Management, LLC | 475,500 | $955.8K | 0.02% | +243,200+104.7% | Added |
| Bank of New York Mellon Corp | 452,829 | $910.2K | 0.00% | +74,092+19.6% | Added |
| Barclays PLC | 372,717 | $749.2K | 0.00% | −36,501−8.9% | Reduced |
| Atom Investors LP | 365,435 | $734.5K | 0.07% | −73,797−16.8% | Reduced |
| BNP Paribas Arbitrage, SA | 336,079 | $675.5K | 0.00% | +255,344+316.3% | Added |
| Jane Street Group, LLC | 317,332 | $637.8K | 0.00% | −53,301−14.4% | Reduced |
| Charles Schwab Investment Management Inc | 312,630 | $628.4K | 0.00% | +16,758+5.7% | Added |
| Susquehanna Fundamental Investments, LLC | 308,691 | $620.5K | 0.01% | +74,575+31.9% | Added |
| HRT Financial LP | 259,689 | $521.0K | 0.00% | +259,689 | New |
| Squarepoint Ops LLC | 252,804 | $508.1K | 0.00% | +252,804 | New |
| FMR LLC | 245,408 | $493.3K | 0.00% | −80,189−24.6% | Reduced |
| Panagora Asset Management Inc | 236,225 | $474.8K | 0.00% | +183+0.1% | Added |
| Alliancebernstein L.P. | 186,060 | $374.0K | 0.00% | +17,250+10.2% | Added |
| Federated Hermes, Inc. | 185,507 | $372.9K | 0.00% | +185,331+105,301.7% | Added |
| HealthInvest Partners AB | 184,900 | $371.6K | 0.23% | +84,900+84.9% | Added |
| Rhumbline Advisers | 176,063 | $353.9K | 0.00% | −2,890−1.6% | Reduced |
| Marshall Wace, LLP | 176,029 | $353.8K | 0.00% | +137,596+358.0% | Added |
| Los Angeles Capital Management LLC | 175,420 | $352.6K | 0.00% | −21,743−11.0% | Reduced |
| Bank of America Corp | 159,773 | $321.1K | 0.00% | −49,790−23.8% | Reduced |
| Macquarie Group Ltd | 150,000 | $302.0K | 0.00% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 138,722 | $279.0K | 0.00% | +105,209+313.9% | Added |
| Nuveen Asset Management, LLC | 123,339 | $247.9K | 0.00% | 00.0% | Unchanged |
| XTX Topco Ltd | 121,432 | $244.1K | 0.02% | +87,893+262.1% | Added |
| Superstring Capital Management LP | 110,073 | $221.2K | 0.28% | +110,073 | New |
| Susquehanna International Group, LLP | 108,859 | $218.8K | 0.00% | +13,377+14.0% | Added |
| ExodusPoint Capital Management, LP | 107,174 | $215.0K | 0.00% | +107,174 | New |
| Price T Rowe Associates Inc | 99,078 | $200.0K | 0.00% | +19,146+24.0% | Added |
| Susquehanna Portfolio Strategies, LLC | 93,878 | $188.7K | 0.01% | 00.0% | Unchanged |
| State of Wisconsin Investment Board | 83,600 | $168.0K | 0.00% | −22,900−21.5% | Reduced |
| Jump Financial, LLC | 80,562 | $161.9K | 0.00% | +64,301+395.4% | Added |
| Acadian Asset Management LLC | 71,506 | $143.0K | 0.00% | −397,417−84.8% | Reduced |
| MetLife Investment Management | 65,583 | $131.8K | 0.00% | +15,684+31.4% | Added |
| QVT Financial LP | 62,657 | $125.9K | 0.01% | 00.0% | Unchanged |
| Corebridge Financial, Inc. | 61,030 | $122.7K | 0.00% | +61,030 | New |
| Gsa Capital Partners LLP | 57,960 | $116.0K | 0.01% | +22,705+64.4% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 56,945 | $114.5K | 0.00% | +56,945 | New |
| Graham Capital Management, L.P. | 50,970 | $102.5K | 0.00% | +50,970 | New |
| Aigen Investment Management, LP | 50,083 | $100.7K | 0.02% | +25,553+104.2% | Added |
| Wells Fargo & Company | 47,270 | $95.0K | 0.00% | +9,645+25.6% | Added |
| Y-Intercept (Hong Kong) Ltd | 46,779 | $94.0K | 0.01% | +46,779 | New |
| Manufacturers Life Insurance Company, The | 46,487 | $93.4K | 0.00% | +4,370+10.4% | Added |
| Ameriprise Financial Inc | 45,547 | $91.5K | 0.00% | +27,637+154.3% | Added |
| Invesco Ltd. | 45,056 | $90.6K | 0.00% | −279,354−86.1% | Reduced |
| Algert Global LLC | 44,655 | $89.8K | 0.00% | +44,655 | New |
| Exchange Traded Concepts, LLC | 43,420 | $87.3K | 0.00% | −13,510−23.7% | Reduced |
| Tower Research Capital LLC (TRC) | 40,760 | $81.9K | 0.00% | +39,940+4,870.7% | Added |
| Voya Investment Management LLC | 38,588 | $77.6K | 0.00% | +2,061+5.6% | Added |
| Simplex Trading, LLC | 38,661 | $77.0K | 0.00% | +30,621+380.9% | Added |
| New York State Common Retirement Fund | 37,235 | $74.8K | 0.00% | +80+0.2% | Added |
| UBS Group AG | 34,983 | $70.3K | 0.00% | −254,684−87.9% | Reduced |
| Walleye Trading LLC | 31,526 | $63.4K | 0.00% | 00.0% | Unchanged |
| State Board of Administration of Florida Retirement System | 28,800 | $57.9K | 0.00% | +1,398+5.1% | Added |
| Citigroup Inc | 25,566 | $51.4K | 0.00% | −389,282−93.8% | Reduced |
| Prio Wealth Limited Partnership | 23,529 | $47.3K | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 23,470 | $47.2K | 0.00% | +23,470 | New |
| Jasper Ridge Partners, L.P. | 23,100 | $46.4K | 0.00% | 00.0% | Unchanged |
| Public Employees Retirement System of Ohio | 20,587 | $41.4K | 0.00% | +20,587 | New |
| AJOVista, LLC | 20,463 | $41.1K | 0.12% | +20,463 | New |
| Principal Financial Group Inc | 18,278 | $36.7K | 0.00% | −13,497−42.5% | Reduced |
| Nisa Investment Advisors, LLC | 17,800 | $35.8K | 0.00% | +64+0.4% | Added |
| Prudential Financial Inc | 17,335 | $34.8K | 0.00% | 00.0% | Unchanged |
| Grimes & Company, Inc. | 14,998 | $30.1K | 0.00% | −349−2.3% | Reduced |
| ProShare Advisors LLC | 14,850 | $29.8K | 0.00% | −5,069−25.4% | Reduced |
| Dimensional Fund Advisors LP | 13,703 | $27.5K | 0.00% | −17,540−56.1% | Reduced |
| HSBC Holdings PLC | 12,526 | $24.9K | 0.00% | −82−0.7% | Reduced |
| Victory Capital Management Inc | 11,873 | $23.9K | 0.00% | −214−1.8% | Reduced |