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 |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 19,364,688 | $24.6M | 0.84% | +19,364,688 | New |
| VR Adviser, LLC | 11,328,000 | $14.4M | 1.51% | +11,328,000 | New |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $11.0M | 1.23% | 00.0% | Unchanged |
| BlackRock Inc. | 7,972,660 | $10.1M | 0.00% | +8,678+0.1% | Added |
| Vanguard Group Inc | 6,186,123 | $7.86M | 0.00% | +461,504+8.1% | Added |
| Bellevue Group AG | 5,218,625 | $6.63M | 0.11% | −8000.0% | Reduced |
| Balyasny Asset Management LLC | 5,040,900 | $6.40M | 0.02% | +201,385+4.2% | Added |
| Silverarc Capital Management, LLC | 5,000,000 | $6.35M | 2.37% | +4,000,000+400.0% | Added |
| Rock Springs Capital Management LP | 3,403,133 | $4.32M | 0.12% | 00.0% | Unchanged |
| Affinity Asset Advisors, LLC | 2,850,000 | $3.62M | 1.18% | +2,850,000 | New |
| Philosophy Capital Management LLC | 2,342,634 | $2.98M | 0.62% | +2,342,634 | New |
| State Street Corp | 2,312,742 | $2.94M | 0.00% | −2,592,407−52.9% | Reduced |
| Commodore Capital LP | 2,244,378 | $2.85M | 0.33% | +2,244,378 | New |
| Millennium Management LLC | 2,177,650 | $2.77M | 0.00% | +305,733+16.3% | Added |
| Geode Capital Management, LLC | 2,157,665 | $2.74M | 0.00% | +151,983+7.6% | Added |
| Walleye Capital LLC | 2,021,467 | $2.57M | 0.04% | +1,866,568+1,205.0% | Added |
| Boxer Capital, LLC | 2,000,000 | $2.54M | 0.14% | +1,000,000+100.0% | Added |
| Citadel Advisors LLC | 1,614,723 | $2.05M | 0.00% | +1,614,647+2,124,535.5% | Added |
| Ikarian Capital, LLC | 1,579,770 | $2.01M | 0.74% | +1,529,770+3,059.5% | Added |
| 5AM Venture Management, LLC | 1,305,000 | $1.66M | 0.48% | 00.0% | Unchanged |
| Woodline Partners LP | 1,302,000 | $1.65M | 0.02% | +1,302,000 | New |
| Baker Bros. Advisors LP | 1,086,115 | $1.38M | 0.01% | 00.0% | Unchanged |
| Altium Capital Management LP | 1,059,136 | $1.35M | 0.78% | +1,059,136 | New |
| Northern Trust Corp | 1,030,586 | $1.31M | 0.00% | −68,515−6.2% | Reduced |
| Morgan Stanley | 986,017 | $1.25M | 0.00% | +221,506+29.0% | Added |
| Renaissance Technologies LLC | 925,919 | $1.18M | 0.00% | −122,000−11.6% | Reduced |
| Decheng Capital Management III (Cayman), LLC | 904,268 | $1.15M | 0.38% | 00.0% | Unchanged |
| DAFNA Capital Management LLC | 734,038 | $932.2K | 0.29% | −76,807−9.5% | Reduced |
| Newtyn Management, LLC | 700,000 | $889.0K | 0.22% | +700,000 | New |
| Bridgeway Capital Management, LLC | 581,700 | $738.8K | 0.02% | +581,700 | New |
| FMR LLC | 579,789 | $736.3K | 0.00% | −899,708−60.8% | Reduced |
| Sarissa Capital Management LP | 550,000 | $698.5K | 0.09% | −2,082,900−79.1% | Reduced |
| Rhenman & Partners Asset Management AB | 400,000 | $508.0K | 0.05% | 00.0% | Unchanged |
| Bank of New York Mellon Corp | 375,756 | $477.2K | 0.00% | −915−0.2% | Reduced |
| Two Sigma Advisers, LP | 360,700 | $458.1K | 0.00% | −217,400−37.6% | Reduced |
| Acadian Asset Management LLC | 354,075 | $449.0K | 0.00% | +354,075 | New |
| Boothbay Fund Management, LLC | 340,545 | $432.5K | 0.02% | +330,520+3,297.0% | Added |
| Goldman Sachs Group Inc | 337,053 | $428.1K | 0.00% | −1,058,965−75.9% | Reduced |
| UBS Oconnor LLC | 296,414 | $376.4K | 0.01% | +296,414 | New |
| Charles Schwab Investment Management Inc | 294,405 | $373.9K | 0.00% | −526,283−64.1% | Reduced |
| Atom Investors LP | 293,177 | $372.3K | 0.08% | +293,177 | New |
| Jane Street Group, LLC | 273,005 | $346.7K | 0.00% | −41,478−13.2% | Reduced |
| JPMorgan Chase & Co | 267,015 | $339.1K | 0.00% | −1,176,779−81.5% | Reduced |
| Panagora Asset Management Inc | 251,793 | $319.8K | 0.00% | −19,708−7.3% | Reduced |
| Los Angeles Capital Management LLC | 197,470 | $250.8K | 0.00% | +197,470 | New |
| Susquehanna International Group, LLP | 180,852 | $229.7K | 0.00% | −111,465−38.1% | Reduced |
| Swiss National Bank | 178,096 | $226.2K | 0.00% | 00.0% | Unchanged |
| Verition Fund Management LLC | 163,451 | $207.6K | 0.00% | +163,451 | New |
| Rhumbline Advisers | 160,076 | $203.3K | 0.00% | −4,795−2.9% | Reduced |
| Marshall Wace, LLP | 157,800 | $200.4K | 0.00% | −2,553,510−94.2% | Reduced |
| Macquarie Group Ltd | 150,000 | $191.0K | 0.00% | 00.0% | Unchanged |
| Two Sigma Investments, LP | 149,066 | $189.3K | 0.00% | −118,204−44.2% | Reduced |
| AQR Capital Management LLC | 143,172 | $181.8K | 0.00% | +71,129+98.7% | Added |
| Alliancebernstein L.P. | 130,740 | $166.0K | 0.00% | −85,980−39.7% | Reduced |
| Credit Suisse AG | 129,067 | $163.9K | 0.00% | −19,396−13.1% | Reduced |
| BNP Paribas Arbitrage, SA | 123,345 | $156.6K | 0.00% | +49,343+66.7% | Added |
| Walleye Trading LLC | 121,502 | $154.3K | 0.00% | +121,502 | New |
| Bank of America Corp | 117,372 | $149.1K | 0.00% | −184,121−61.1% | Reduced |
| Dimensional Fund Advisors LP | 112,218 | $142.5K | 0.00% | −77,393−40.8% | Reduced |
| UBS Asset Management Americas Inc | 102,575 | $130.3K | 0.00% | 00.0% | Unchanged |
| Gsa Capital Partners LLP | 101,788 | $129.0K | 0.01% | −285,803−73.7% | Reduced |
| Acuta Capital Partners, LLC | 99,607 | $126.5K | 0.09% | +99,607 | New |
| California State Teachers Retirement System | 98,959 | $125.7K | 0.00% | −6,387−6.1% | Reduced |
| Alps Advisors Inc | 88,919 | $112.9K | 0.00% | +4,839+5.8% | Added |
| Price T Rowe Associates Inc | 87,113 | $111.0K | 0.00% | −32,232−27.0% | Reduced |
| XTX Topco Ltd | 79,215 | $100.6K | 0.02% | +79,215 | New |
| Exchange Traded Concepts, LLC | 73,694 | $93.6K | 0.00% | +58,393+381.6% | Added |
| D. E. Shaw & Co., Inc. | 67,782 | $86.1K | 0.00% | −917,957−93.1% | Reduced |
| Nuveen Asset Management, LLC | 65,881 | $83.7K | 0.00% | −1,175,710−94.7% | Reduced |
| Invesco Ltd. | 65,032 | $82.6K | 0.00% | +26,416+68.4% | Added |
| HRT Financial LP | 64,179 | $81.0K | 0.00% | +64,179 | New |
| Deutsche Bank AG | 62,827 | $79.8K | 0.00% | −1,074,916−94.5% | Reduced |
| QVT Financial LP | 62,657 | $79.6K | 0.00% | 00.0% | Unchanged |
| Ghost Tree Capital, LLC | 61,250 | $77.8K | 0.04% | 00.0% | Unchanged |
| Cubist Systematic Strategies, LLC | 60,757 | $77.2K | 0.00% | −125,641−67.4% | Reduced |
| UBS Group AG | 56,943 | $72.3K | 0.00% | −116,674−67.2% | Reduced |
| Legal & General Group Plc | 53,162 | $67.5K | 0.00% | −19,675−27.0% | Reduced |
| American International Group, Inc. | 52,520 | $66.7K | 0.00% | +4,222+8.7% | Added |
| Tower Research Capital LLC (TRC) | 48,309 | $61.4K | 0.00% | +40,906+552.6% | Added |
| Graham Capital Management, L.P. | 46,824 | $59.5K | 0.00% | −26,920−36.5% | Reduced |
| MetLife Investment Management | 46,642 | $59.2K | 0.00% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 46,640 | $59.0K | 0.00% | +46,640 | New |
| Y-Intercept (Hong Kong) Ltd | 45,229 | $57.4K | 0.01% | +33,580+288.3% | Added |
| Great West Life Assurance Co | 44,554 | $56.0K | 0.00% | 00.0% | Unchanged |
| Voya Investment Management LLC | 43,631 | $55.4K | 0.00% | −13,076−23.1% | Reduced |
| Group One Trading, L.P. | 42,068 | $53.4K | 0.00% | −118,235−73.8% | Reduced |
| Manufacturers Life Insurance Company, The | 41,657 | $52.9K | 0.00% | +791+1.9% | Added |
| New York State Common Retirement Fund | 37,356 | $47.4K | 0.00% | +363+1.0% | Added |
| Harbor Capital Advisors, Inc. | 37,062 | $47.1K | 0.01% | +15,723+73.7% | Added |
| Hunter Perkins Capital Management, LLC | 37,000 | $47.0K | 0.01% | +37,000 | New |
| Barclays PLC | 34,154 | $43.4K | 0.00% | −152,775−81.7% | Reduced |
| Principal Financial Group Inc | 31,751 | $40.3K | 0.00% | +1,412+4.7% | Added |
| Janus Henderson Group PLC | 30,649 | $38.8K | 0.00% | +33+0.1% | Added |
| Pale Fire Capital SE | 25,400 | $32.3K | 0.00% | 00.0% | Unchanged |
| Engineers Gate Manager LP | 25,088 | $31.9K | 0.00% | −15,652−38.4% | Reduced |
| Arizona State Retirement System | 24,427 | $31.0K | 0.00% | +1,450+6.3% | Added |
| Teacher Retirement System of Texas | 24,067 | $31.0K | 0.00% | +1,880+8.5% | Added |
| Point72 Middle East FZE | 24,344 | $30.9K | 0.00% | +24,344 | New |
| Prio Wealth Limited Partnership | 23,529 | $29.9K | 0.00% | 00.0% | Unchanged |
| Jasper Ridge Partners, L.P. | 23,100 | $29.3K | 0.00% | 00.0% | Unchanged |