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 2023
Institutional positions in Mersana Therapeutics, Inc. as of Jun 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
- 147
- −11 vs. Q1 2023
- Shares held
- 112.5M
- +5.89M (+5.5%) vs. Q1 2023
- Total value
- $370.2M
- −$67.0M (−15.3%) vs. Q1 2023
- New holders
- 33
- 56 more added
- Sold out
- 44
- 41 more reduced
Compare with Q1 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, Q2 2023
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q1 2023.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $28.5M | 2.94% | 00.0% | Unchanged |
| BlackRock Inc. | 7,963,982 | $26.2M | 0.00% | +490,160+6.6% | Added |
| OrbiMed Advisors LLC | 7,214,937 | $23.7M | 0.46% | −1,796,500−19.9% | Reduced |
| Avoro Capital Advisors LLC | 6,375,000 | $21.0M | 0.28% | −1,175,000−15.6% | Reduced |
| Vanguard Group Inc | 5,724,619 | $18.8M | 0.00% | +1,086,127+23.4% | Added |
| Bellevue Group AG | 5,219,425 | $17.2M | 0.24% | +919,806+21.4% | Added |
| State Street Corp | 4,905,149 | $16.1M | 0.00% | −1,507,073−23.5% | Reduced |
| Balyasny Asset Management LLC | 4,839,515 | $15.9M | 0.04% | +4,839,515 | New |
| Avidity Partners Management LP | 3,790,000 | $12.5M | 0.44% | +356,767+10.4% | Added |
| Rock Springs Capital Management LP | 3,403,133 | $11.2M | 0.27% | −700,670−17.1% | Reduced |
| Artal Group S.A. | 3,029,555 | $9.97M | 0.32% | +813,767+36.7% | Added |
| Deerfield Management Company, L.P. (Series C) | 2,885,400 | $9.49M | 0.20% | +2,885,400 | New |
| Logos Global Management LP | 2,800,000 | $9.21M | 1.27% | +2,800,000 | New |
| Marshall Wace, LLP | 2,711,310 | $8.92M | 0.02% | +214,600+8.6% | Added |
| Sarissa Capital Management LP | 2,632,900 | $8.66M | 0.86% | −1,167,100−30.7% | Reduced |
| Candriam Luxembourg S.C.A. | 2,415,477 | $7.95M | 0.06% | −547,371−18.5% | Reduced |
| Geode Capital Management, LLC | 2,005,682 | $6.60M | 0.00% | +206,835+11.5% | Added |
| Millennium Management LLC | 1,871,917 | $6.16M | 0.01% | +610,863+48.4% | Added |
| Redmile Group, LLC | 1,698,626 | $5.59M | 0.21% | +1,698,626 | New |
| FMR LLC | 1,479,497 | $4.87M | 0.00% | +1,355,682+1,094.9% | Added |
| JPMorgan Chase & Co | 1,443,794 | $4.75M | 0.00% | +1,322,229+1,087.7% | Added |
| Goldman Sachs Group Inc | 1,396,018 | $4.59M | 0.00% | −1,543,522−52.5% | Reduced |
| 5AM Venture Management, LLC | 1,305,000 | $4.29M | 1.07% | +120,000+10.1% | Added |
| Nuveen Asset Management, LLC | 1,241,591 | $4.08M | 0.00% | +1040.0% | Added |
| Deutsche Bank AG | 1,137,743 | $3.74M | 0.00% | −9,811−0.9% | Reduced |
| Northern Trust Corp | 1,099,101 | $3.62M | 0.00% | +214,468+24.2% | Added |
| Baker Bros. Advisors LP | 1,086,115 | $3.57M | 0.02% | −800,000−42.4% | Reduced |
| Renaissance Technologies LLC | 1,047,919 | $3.45M | 0.00% | −202,600−16.2% | Reduced |
| Silverarc Capital Management, LLC | 1,000,000 | $3.29M | 1.11% | +459,941+85.2% | Added |
| Boxer Capital, LLC | 1,000,000 | $3.29M | 0.15% | +1,000,000 | New |
| D. E. Shaw & Co., Inc. | 985,739 | $3.24M | 0.01% | −820,360−45.4% | Reduced |
| Hudson Bay Capital Management LP | 962,359 | $3.17M | 0.03% | +637,359+196.1% | Added |
| Decheng Capital Management III (Cayman), LLC | 904,268 | $2.98M | 0.93% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 820,688 | $2.70M | 0.00% | +91,017+12.5% | Added |
| DAFNA Capital Management LLC | 810,845 | $2.67M | 0.73% | +299,982+58.7% | Added |
| Morgan Stanley | 764,511 | $2.52M | 0.00% | −1,134,122−59.7% | Reduced |
| RTW Investments, LP | 614,838 | $2.02M | 0.04% | +614,838 | New |
| Two Sigma Advisers, LP | 578,100 | $1.90M | 0.00% | −226,400−28.1% | Reduced |
| Ameriprise Financial Inc | 572,273 | $1.88M | 0.00% | +572,273 | New |
| First Manhattan Co | 569,594 | $1.87M | 0.01% | +569,594 | New |
| Readystate Asset Management LP | 567,300 | $1.87M | 0.19% | +567,300 | New |
| Kennedy Capital Management, Inc. | 555,279 | $1.83M | 0.04% | +63,215+12.8% | Added |
| Adage Capital Partners GP, L.L.C. | 500,000 | $1.65M | 0.00% | +500,000 | New |
| Tri Locum Partners LP | 428,307 | $1.41M | 0.52% | +428,307 | New |
| Sphera Funds Management Ltd. | 418,562 | $1.38M | 0.30% | +407,941+3,840.9% | Added |
| Squarepoint Ops LLC | 418,224 | $1.38M | 0.01% | +405,988+3,318.0% | Added |
| Rhenman & Partners Asset Management AB | 400,000 | $1.32M | 0.14% | +50,000+14.3% | Added |
| Gsa Capital Partners LLP | 387,591 | $1.27M | 0.13% | +183,115+89.6% | Added |
| Bank of New York Mellon Corp | 376,671 | $1.24M | 0.00% | +6,885+1.9% | Added |
| Rafferty Asset Management, LLC | 336,656 | $1.11M | 0.01% | −149,052−30.7% | Reduced |
| Schonfeld Strategic Advisors LLC | 320,540 | $1.05M | 0.01% | +320,540 | New |
| Jane Street Group, LLC | 314,483 | $1.03M | 0.00% | +314,483 | New |
| Bank of America Corp | 301,493 | $991.9K | 0.00% | −714,391−70.3% | Reduced |
| Susquehanna International Group, LLP | 292,317 | $961.7K | 0.00% | +18,031+6.6% | Added |
| Panagora Asset Management Inc | 271,501 | $893.2K | 0.01% | +55,304+25.6% | Added |
| Two Sigma Investments, LP | 267,270 | $879.3K | 0.00% | +62,686+30.6% | Added |
| Algert Global LLC | 219,846 | $723.3K | 0.03% | +188,500+601.4% | Added |
| Alliancebernstein L.P. | 216,720 | $713.0K | 0.00% | +117,020+117.4% | Added |
| Qube Research & Technologies Ltd | 204,106 | $671.5K | 0.00% | −47,690−18.9% | Reduced |
| Dimensional Fund Advisors LP | 189,611 | $623.7K | 0.00% | −229,726−54.8% | Reduced |
| Barclays PLC | 186,929 | $615.0K | 0.00% | −11,104−5.6% | Reduced |
| Cubist Systematic Strategies, LLC | 186,398 | $613.2K | 0.01% | −124,543−40.1% | Reduced |
| Caption Management, LLC | 181,000 | $595.5K | 0.10% | −114,900−38.8% | Reduced |
| Swiss National Bank | 178,096 | $585.9K | 0.00% | +5,800+3.4% | Added |
| UBS Group AG | 173,617 | $571.2K | 0.00% | −11,782−6.4% | Reduced |
| Rhumbline Advisers | 164,871 | $542.4K | 0.00% | +6,530+4.1% | Added |
| Group One Trading, L.P. | 160,303 | $527.4K | 0.02% | +158,204+7,537.1% | Added |
| Walleye Capital LLC | 154,899 | $509.6K | 0.01% | −68,489−30.7% | Reduced |
| Macquarie Group Ltd | 150,000 | $494.0K | 0.00% | 00.0% | Unchanged |
| Nomura Holdings Inc | 148,979 | $490.1K | 0.00% | +148,979 | New |
| Credit Suisse AG | 148,463 | $488.4K | 0.00% | +44,584+42.9% | Added |
| Federated Hermes, Inc. | 140,645 | $462.7K | 0.00% | +140,645 | New |
| UBS Asset Management Americas Inc | 102,575 | $421.6K | 0.00% | 00.0% | Unchanged |
| Citigroup Inc | 125,628 | $413.3K | 0.00% | −293,644−70.0% | Reduced |
| Price T Rowe Associates Inc | 119,345 | $394.0K | 0.00% | −2,032−1.7% | Reduced |
| California State Teachers Retirement System | 105,346 | $346.6K | 0.00% | +815+0.8% | Added |
| Wells Fargo & Company | 102,903 | $338.6K | 0.00% | +5,628+5.8% | Added |
| Russell Investments Group, Ltd. | 99,764 | $328.2K | 0.00% | +81,367+442.3% | Added |
| Skandinaviska Enskilda Banken AB (publ) | 93,132 | $306.0K | 0.00% | +34,663+59.3% | Added |
| Alps Advisors Inc | 84,080 | $276.6K | 0.00% | +12,909+18.1% | Added |
| BNP Paribas Arbitrage, SA | 74,002 | $243.5K | 0.00% | −147,706−66.6% | Reduced |
| Graham Capital Management, L.P. | 73,744 | $242.6K | 0.01% | +73,744 | New |
| Legal & General Group Plc | 72,837 | $239.6K | 0.00% | +36,387+99.8% | Added |
| AQR Capital Management LLC | 72,043 | $237.0K | 0.00% | +38,141+112.5% | Added |
| State of Wisconsin Investment Board | 70,024 | $230.4K | 0.00% | −3,614−4.9% | Reduced |
| Simplex Trading, LLC | 65,850 | $216.0K | 0.01% | +20,308+44.6% | Added |
| QVT Financial LP | 62,657 | $206.1K | 0.01% | 00.0% | Unchanged |
| Profund Advisors LLC | 61,786 | $203.3K | 0.01% | −28,309−31.4% | Reduced |
| Ghost Tree Capital, LLC | 61,250 | $201.5K | 0.07% | +61,250 | New |
| Thrivent Financial for Lutherans | 58,073 | $191.0K | 0.00% | −2,849−4.7% | Reduced |
| Mirae Asset Global Investments Co., Ltd. | 57,099 | $186.8K | 0.00% | −6,966−10.9% | Reduced |
| Voya Investment Management LLC | 56,707 | $186.6K | 0.00% | −445,452−88.7% | Reduced |
| Ikarian Capital, LLC | 50,000 | $164.5K | 0.06% | +50,000 | New |
| American International Group, Inc. | 48,298 | $158.9K | 0.00% | +3,628+8.1% | Added |
| MetLife Investment Management | 46,642 | $153.5K | 0.00% | 00.0% | Unchanged |
| Great West Life Assurance Co | 44,554 | $147.0K | 0.00% | 00.0% | Unchanged |
| Manufacturers Life Insurance Company, The | 40,866 | $134.4K | 0.00% | +5,269+14.8% | Added |
| Engineers Gate Manager LP | 40,740 | $134.0K | 0.01% | −28,420−41.1% | Reduced |
| Jefferies Financial Group Inc. | 39,975 | $131.5K | 0.00% | +39,975 | New |
| Invesco Ltd. | 38,616 | $127.0K | 0.00% | +5,805+17.7% | Added |