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 2023
Institutional positions in Mersana Therapeutics, Inc. as of Mar 31, 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
- 158
- +7 vs. Q4 2022
- Shares held
- 106.6M
- +5.51M (+5.4%) vs. Q4 2022
- Total value
- $437.2M
- −$155.2M (−26.2%) vs. Q4 2022
- New holders
- 26
- 51 more added
- Sold out
- 19
- 44 more reduced
1 institution that held it in Q4 2022 haven't filed for Q1 2023 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2022: 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 2023
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q4 2022.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| OrbiMed Advisors LLC | 9,011,437 | $37.0M | 0.73% | 00.0% | Unchanged |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $35.6M | 4.45% | 00.0% | Unchanged |
| Avoro Capital Advisors LLC | 7,550,000 | $31.0M | 0.46% | 00.0% | Unchanged |
| BlackRock Inc. | 7,473,822 | $30.7M | 0.00% | −18,107−0.2% | Reduced |
| State Street Corp | 6,412,222 | $26.4M | 0.00% | +556,161+9.5% | Added |
| Vanguard Group Inc | 4,638,492 | $19.1M | 0.00% | +189,452+4.3% | Added |
| Bellevue Group AG | 4,299,619 | $17.7M | 0.26% | +17,019+0.4% | Added |
| Rock Springs Capital Management LP | 4,103,803 | $16.9M | 0.40% | 00.0% | Unchanged |
| Sarissa Capital Management LP | 3,800,000 | $15.6M | 2.00% | −197,010−4.9% | Reduced |
| Avidity Partners Management LP | 3,433,233 | $14.1M | 0.47% | +3,433,233 | New |
| Braidwell LP | 3,355,805 | $13.8M | 0.45% | +1,493,105+80.2% | Added |
| Goldman Sachs Group Inc | 2,939,540 | $12.1M | 0.00% | +925,044+45.9% | Added |
| Candriam Luxembourg S.C.A. | 2,962,848 | $11.2M | 0.08% | +270,000+10.0% | Added |
| Marshall Wace, LLP | 2,496,710 | $10.3M | 0.03% | −27,274−1.1% | Reduced |
| Artal Group S.A. | 2,215,788 | $9.11M | 0.54% | +15,788+0.7% | Added |
| Morgan Stanley | 1,898,633 | $7.80M | 0.00% | +140,647+8.0% | Added |
| Baker Bros. Advisors LP | 1,886,115 | $7.75M | 0.04% | +1,886,115 | New |
| D. E. Shaw & Co., Inc. | 1,806,099 | $7.42M | 0.01% | −529,840−22.7% | Reduced |
| Geode Capital Management, LLC | 1,798,847 | $7.39M | 0.00% | +91,377+5.4% | Added |
| Millennium Management LLC | 1,261,054 | $5.18M | 0.01% | −2,402,473−65.6% | Reduced |
| Renaissance Technologies LLC | 1,250,519 | $5.14M | 0.01% | +678,800+118.7% | Added |
| Nuveen Asset Management, LLC | 1,241,487 | $5.10M | 0.00% | +12,080+1.0% | Added |
| Ally Bridge Group (NY) LLC | 1,191,271 | $4.90M | 6.42% | 00.0% | Unchanged |
| 5AM Venture Management, LLC | 1,185,000 | $4.87M | 1.25% | +1,185,000 | New |
| Deutsche Bank AG | 1,147,554 | $4.72M | 0.00% | +16,850+1.5% | Added |
| Bank of America Corp | 1,015,884 | $4.18M | 0.00% | +255,161+33.5% | Added |
| Decheng Capital Management III (Cayman), LLC | 904,268 | $3.72M | 1.50% | 00.0% | Unchanged |
| Northern Trust Corp | 884,633 | $3.64M | 0.00% | −19,743−2.2% | Reduced |
| Two Sigma Advisers, LP | 804,500 | $3.31M | 0.01% | −248,800−23.6% | Reduced |
| Charles Schwab Investment Management Inc | 729,671 | $3.00M | 0.00% | +58,644+8.7% | Added |
| Hillsdale Investment Management Inc. | 693,200 | $2.85M | 0.24% | 00.0% | Unchanged |
| Silverarc Capital Management, LLC | 540,059 | $2.22M | 1.00% | −600,123−52.6% | Reduced |
| DAFNA Capital Management LLC | 510,863 | $2.10M | 0.63% | +97,400+23.6% | Added |
| Voya Investment Management LLC | 502,159 | $2.06M | 0.00% | +215,265+75.0% | Added |
| Kennedy Capital Management, Inc. | 492,064 | $2.02M | 0.06% | +53,082+12.1% | Added |
| Rafferty Asset Management, LLC | 485,708 | $2.00M | 0.01% | +68,844+16.5% | Added |
| CIBC Asset Management Inc | 476,684 | $1.96M | 0.01% | −90,101−15.9% | Reduced |
| UBS Oconnor LLC | 462,699 | $1.90M | 0.05% | +462,699 | New |
| Dimensional Fund Advisors LP | 419,337 | $1.72M | 0.00% | −70,446−14.4% | Reduced |
| Citigroup Inc | 419,272 | $1.72M | 0.00% | +225,800+116.7% | Added |
| Lion Point Capital, LP | 409,120 | $1.68M | 0.93% | +409,120 | New |
| Bank of New York Mellon Corp | 369,786 | $1.52M | 0.00% | +1,757+0.5% | Added |
| Sectoral Asset Management Inc | 343,079 | $1.41M | 0.27% | +343,079 | New |
| Vontobel Holding Ltd. | 343,079 | $1.41M | 0.01% | +343,079 | New |
| Rhenman & Partners Asset Management AB | 350,000 | $1.40M | 0.15% | −50,000−12.5% | Reduced |
| Hudson Bay Capital Management LP | 325,000 | $1.34M | 0.01% | +50,000+18.2% | Added |
| Cubist Systematic Strategies, LLC | 310,941 | $1.28M | 0.01% | −116,211−27.2% | Reduced |
| Caption Management, LLC | 295,900 | $1.22M | 0.26% | +295,900 | New |
| Platinum Investment Management Ltd | 290,298 | $1.19M | 0.04% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 274,286 | $1.13M | 0.00% | +234,334+586.5% | Added |
| Qube Research & Technologies Ltd | 251,796 | $1.03M | 0.01% | +165,410+191.5% | Added |
| Walleye Capital LLC | 223,388 | $918.1K | 0.02% | +223,388 | New |
| BNP Paribas Arbitrage, SA | 221,708 | $911.2K | 0.00% | +99,032+80.7% | Added |
| Panagora Asset Management Inc | 216,197 | $888.6K | 0.01% | +25,234+13.2% | Added |
| Two Sigma Investments, LP | 204,584 | $840.8K | 0.00% | −413,245−66.9% | Reduced |
| Gsa Capital Partners LLP | 204,476 | $840.0K | 0.08% | +172,235+534.2% | Added |
| Barclays PLC | 198,033 | $813.9K | 0.00% | −34,055−14.7% | Reduced |
| UBS Group AG | 185,399 | $762.0K | 0.00% | −103,204−35.8% | Reduced |
| Swiss National Bank | 172,296 | $708.1K | 0.00% | −15,400−8.2% | Reduced |
| Tekla Capital Management LLC | 162,383 | $667.4K | 0.03% | +162,383 | New |
| Rhumbline Advisers | 158,341 | $651.0K | 0.00% | +5,376+3.5% | Added |
| Macquarie Group Ltd | 150,000 | $617.0K | 0.00% | 00.0% | Unchanged |
| FMR LLC | 123,815 | $508.9K | 0.00% | +438+0.4% | Added |
| JPMorgan Chase & Co | 121,565 | $500.0K | 0.00% | −265,258−68.6% | Reduced |
| Price T Rowe Associates Inc | 121,377 | $500.0K | 0.00% | +858+0.7% | Added |
| Citadel Advisors LLC | 112,661 | $463.0K | 0.00% | −512,915−82.0% | Reduced |
| California State Teachers Retirement System | 104,531 | $429.6K | 0.00% | +58+0.1% | Added |
| Credit Suisse AG | 103,879 | $426.9K | 0.00% | +6,405+6.6% | Added |
| UBS Asset Management Americas Inc | 102,575 | $421.6K | 0.00% | 00.0% | Unchanged |
| Alliancebernstein L.P. | 99,700 | $409.8K | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 97,275 | $399.8K | 0.00% | +97,275 | New |
| Allianz Asset Management GmbH | 90,500 | $372.0K | 0.00% | +30,400+50.6% | Added |
| Profund Advisors LLC | 90,095 | $370.3K | 0.02% | +90,095 | New |
| HAP Trading, LLC | 89,563 | $368.0K | 0.09% | +89,563 | New |
| Healthcare of Ontario Pension Plan Trust Fund | 84,000 | $345.2K | 0.00% | 00.0% | Unchanged |
| Trexquant Investment LP | 80,438 | $330.6K | 0.01% | −77,293−49.0% | Reduced |
| State of Wisconsin Investment Board | 73,638 | $302.7K | 0.00% | +740+1.0% | Added |
| Alps Advisors Inc | 71,171 | $292.5K | 0.00% | +3,435+5.1% | Added |
| Engineers Gate Manager LP | 69,160 | $284.2K | 0.01% | +13,158+23.5% | Added |
| Mackenzie Financial Corp | 68,822 | $282.9K | 0.00% | −4,870−6.6% | Reduced |
| Jacobs Levy Equity Management, Inc | 65,891 | $270.8K | 0.00% | −437,254−86.9% | Reduced |
| Mirae Asset Global Investments Co., Ltd. | 64,065 | $263.3K | 0.00% | +18,544+40.7% | Added |
| QVT Financial LP | 62,657 | $257.5K | 0.02% | 00.0% | Unchanged |
| Los Angeles Capital Management LLC | 61,790 | $254.0K | 0.00% | +10,725+21.0% | Added |
| Thrivent Financial for Lutherans | 60,922 | $250.0K | 0.00% | 00.0% | Unchanged |
| Acuta Capital Partners, LLC | 60,000 | $246.6K | 0.19% | −890,000−93.7% | Reduced |
| Occudo Quantitative Strategies LP | 59,411 | $244.2K | 0.02% | −22,127−27.1% | Reduced |
| Connor, Clark & Lunn Investment Management Ltd. | 59,051 | $242.7K | 0.00% | −149,382−71.7% | Reduced |
| Skandinaviska Enskilda Banken AB (publ) | 58,469 | $240.0K | 0.00% | −2,853−4.7% | Reduced |
| Prudential Financial Inc | 51,155 | $210.2K | 0.00% | −7,550−12.9% | Reduced |
| SG Americas Securities, LLC | 46,605 | $192.0K | 0.00% | −2,326−4.8% | Reduced |
| MetLife Investment Management | 46,642 | $191.7K | 0.00% | 00.0% | Unchanged |
| XTX Topco Ltd | 45,738 | $188.0K | 0.04% | −87,166−65.6% | Reduced |
| Simplex Trading, LLC | 45,542 | $187.0K | 0.01% | +42,452+1,373.9% | Added |
| Great West Life Assurance Co | 44,554 | $184.0K | 0.00% | 00.0% | Unchanged |
| American International Group, Inc. | 44,670 | $183.6K | 0.00% | +889+2.0% | Added |
| CM Wealth Advisors LLC | 45,367 | $176.0K | 0.03% | +45,367 | New |
| Cornercap Investment Counsel Inc | 42,633 | $175.2K | 0.03% | 00.0% | Unchanged |
| ExodusPoint Capital Management, LP | 40,034 | $165.0K | 0.00% | +28,235+239.3% | Added |
| New York State Common Retirement Fund | 37,108 | $152.5K | 0.00% | −18,873−33.7% | Reduced |