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 2024
Institutional positions in Mersana Therapeutics, Inc. as of Mar 31, 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
- 125
- +19 vs. Q4 2023
- Shares held
- 117.5M
- +4.20M (+3.7%) vs. Q4 2023
- Total value
- $526.3M
- +$263.3M (+100.1%) vs. Q4 2023
- New holders
- 38
- 33 more added
- Sold out
- 19
- 37 more reduced
Compare with Q4 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, Q1 2024
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q4 2023.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 19,364,688 | $86.8M | 2.21% | 00.0% | Unchanged |
| VR Adviser, LLC | 11,328,000 | $50.7M | 2.41% | 00.0% | Unchanged |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $38.8M | 3.12% | 00.0% | Unchanged |
| BlackRock Inc. | 8,095,729 | $36.3M | 0.00% | +251,447+3.2% | Added |
| Vanguard Group Inc | 6,274,370 | $28.1M | 0.00% | +36,782+0.6% | Added |
| State Street Corp | 5,497,443 | $24.6M | 0.00% | +3,168,009+136.0% | Added |
| Nextech Invest AG | 3,856,321 | $17.3M | 2.74% | −2,122,006−35.5% | Reduced |
| Balyasny Asset Management LLC | 3,655,998 | $16.4M | 0.04% | −6,042,149−62.3% | Reduced |
| Citadel Advisors LLC | 3,458,985 | $15.5M | 0.01% | +1,532,054+79.5% | Added |
| Rock Springs Capital Management LP | 3,046,782 | $13.6M | 0.35% | 00.0% | Unchanged |
| Silverarc Capital Management, LLC | 2,968,798 | $13.3M | 3.73% | −3,451,338−53.8% | Reduced |
| Morgan Stanley | 2,942,677 | $13.2M | 0.00% | −1,191,869−28.8% | Reduced |
| Woodline Partners LP | 2,934,622 | $13.1M | 0.12% | +2,934,622 | New |
| Cormorant Asset Management, LP | 2,600,000 | $11.6M | 0.51% | +2,600,000 | New |
| Geode Capital Management, LLC | 2,358,221 | $10.6M | 0.00% | +61,085+2.7% | Added |
| Acuta Capital Partners, LLC | 2,164,628 | $9.70M | 6.30% | −203,372−8.6% | Reduced |
| Deutsche Bank AG | 1,585,263 | $7.10M | 0.00% | +446,031+39.2% | Added |
| Millennium Management LLC | 1,507,580 | $6.75M | 0.01% | −1,886,860−55.6% | Reduced |
| Renaissance Technologies LLC | 1,427,819 | $6.40M | 0.01% | +562,088+64.9% | Added |
| JPMorgan Chase & Co | 1,427,340 | $6.39M | 0.00% | +1,348,517+1,710.8% | Added |
| 5AM Venture Management, LLC | 1,305,000 | $5.85M | 1.31% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 1,222,623 | $5.48M | 0.01% | +555,240+83.2% | Added |
| Baker Bros. Advisors LP | 1,086,115 | $4.87M | 0.06% | 00.0% | Unchanged |
| Schonfeld Strategic Advisors LLC | 1,008,658 | $4.52M | 0.04% | −130,749−11.5% | Reduced |
| Affinity Asset Advisors, LLC | 1,000,000 | $4.48M | 0.73% | 00.0% | Unchanged |
| Octagon Capital Advisors LP | 1,000,000 | $4.48M | 0.54% | +1,000,000 | New |
| Qube Research & Technologies Ltd | 959,695 | $4.30M | 0.01% | +959,695 | New |
| Northern Trust Corp | 945,171 | $4.23M | 0.00% | +13,765+1.5% | Added |
| Jacobs Levy Equity Management, Inc | 809,879 | $3.63M | 0.02% | −120,728−13.0% | Reduced |
| Ally Bridge Group (NY) LLC | 801,437 | $3.59M | 2.00% | +801,437 | New |
| Goldman Sachs Group Inc | 672,607 | $3.01M | 0.00% | +527,042+362.1% | Added |
| Deep Track Capital, LP | 579,674 | $2.60M | 0.07% | +579,674 | New |
| Verition Fund Management LLC | 564,163 | $2.53M | 0.02% | +564,163 | New |
| Wellington Management Group LLP | 534,618 | $2.40M | 0.00% | +534,618 | New |
| ClariVest Asset Management LLC | 471,848 | $2.11M | 0.22% | +471,848 | New |
| Acadian Asset Management LLC | 468,923 | $2.10M | 0.01% | +293,115+166.7% | Added |
| Atom Investors LP | 439,232 | $1.97M | 0.25% | −335,427−43.3% | Reduced |
| UBS Oconnor LLC | 434,293 | $1.95M | 0.06% | −121,352−21.8% | Reduced |
| Citigroup Inc | 414,848 | $1.86M | 0.00% | +398,874+2,497.0% | Added |
| Barclays PLC | 409,218 | $1.83M | 0.00% | +257,154+169.1% | Added |
| Bank of New York Mellon Corp | 378,737 | $1.70M | 0.00% | −7,922−2.0% | Reduced |
| Jane Street Group, LLC | 370,633 | $1.66M | 0.00% | −390−0.1% | Reduced |
| Rafferty Asset Management, LLC | 368,434 | $1.65M | 0.01% | +368,434 | New |
| FMR LLC | 325,597 | $1.46M | 0.00% | −210,031−39.2% | Reduced |
| Invesco Ltd. | 324,410 | $1.45M | 0.00% | +275,680+565.7% | Added |
| Monashee Investment Management LLC | 310,000 | $1.39M | 0.16% | +310,000 | New |
| Charles Schwab Investment Management Inc | 295,872 | $1.33M | 0.00% | −12,200−4.0% | Reduced |
| UBS Group AG | 289,667 | $1.30M | 0.00% | +136,391+89.0% | Added |
| Cubist Systematic Strategies, LLC | 239,143 | $1.07M | 0.01% | +123,487+106.8% | Added |
| Panagora Asset Management Inc | 236,042 | $1.06M | 0.01% | −15,340−6.1% | Reduced |
| Susquehanna Fundamental Investments, LLC | 234,116 | $1.05M | 0.05% | +234,116 | New |
| Bridgeway Capital Management, LLC | 232,300 | $1.04M | 0.02% | 00.0% | Unchanged |
| Two Sigma Investments, LP | 217,945 | $976.4K | 0.00% | +46,600+27.2% | Added |
| Bank of America Corp | 209,563 | $938.8K | 0.00% | +47,499+29.3% | Added |
| Canada Pension Plan Investment Board | 204,900 | $918.0K | 0.00% | +204,900 | New |
| Los Angeles Capital Management LLC | 197,163 | $883.3K | 0.00% | −307−0.2% | Reduced |
| Rhumbline Advisers | 178,953 | $801.7K | 0.00% | +18,882+11.8% | Added |
| Alliancebernstein L.P. | 168,810 | $756.3K | 0.00% | +50,630+42.8% | Added |
| Two Sigma Advisers, LP | 155,800 | $698.0K | 0.00% | +4,400+2.9% | Added |
| Macquarie Group Ltd | 150,000 | $672.0K | 0.00% | 00.0% | Unchanged |
| Lighthouse Investment Partners, LLC | 129,515 | $580.2K | 0.03% | +129,515 | New |
| Nuveen Asset Management, LLC | 123,339 | $552.6K | 0.00% | +57,458+87.2% | Added |
| HighVista Strategies LLC | 122,315 | $548.0K | 0.20% | +122,315 | New |
| State of Wisconsin Investment Board | 106,500 | $477.1K | 0.00% | +106,500 | New |
| HealthInvest Partners AB | 100,000 | $448.0K | 0.27% | +100,000 | New |
| Susquehanna International Group, LLP | 95,482 | $427.8K | 0.00% | −57,299−37.5% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 93,878 | $420.6K | 0.01% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 80,735 | $361.7K | 0.00% | +38,239+90.0% | Added |
| Price T Rowe Associates Inc | 79,932 | $359.0K | 0.00% | +4,962+6.6% | Added |
| QVT Financial LP | 62,657 | $282.9K | 0.03% | 00.0% | Unchanged |
| Profund Advisors LLC | 58,220 | $260.8K | 0.01% | +58,220 | New |
| Deerfield Management Company, L.P. (Series C) | 57,478 | $257.5K | 0.00% | +57,478 | New |
| Exchange Traded Concepts, LLC | 56,930 | $255.0K | 0.01% | −41,799−42.3% | Reduced |
| American International Group, Inc. | 54,639 | $244.8K | 0.00% | −469−0.9% | Reduced |
| Mirae Asset Global Investments Co., Ltd. | 54,127 | $226.2K | 0.00% | +54,127 | New |
| MetLife Investment Management | 49,899 | $223.5K | 0.00% | +3,257+7.0% | Added |
| Manufacturers Life Insurance Company, The | 42,117 | $188.7K | 0.00% | +460+1.1% | Added |
| Marshall Wace, LLP | 38,433 | $172.2K | 0.00% | −119,367−75.6% | Reduced |
| Wells Fargo & Company | 37,625 | $168.6K | 0.00% | +6,794+22.0% | Added |
| New York State Common Retirement Fund | 37,155 | $166.5K | 0.00% | −94−0.3% | Reduced |
| Voya Investment Management LLC | 36,527 | $163.6K | 0.00% | −9,506−20.7% | Reduced |
| Gsa Capital Partners LLP | 35,255 | $158.0K | 0.01% | +35,255 | New |
| XTX Topco Ltd | 33,539 | $150.3K | 0.02% | +33,539 | New |
| SG Americas Securities, LLC | 33,513 | $150.0K | 0.00% | −5,713−14.6% | Reduced |
| Principal Financial Group Inc | 31,775 | $142.4K | 0.00% | −1,702−5.1% | Reduced |
| Walleye Trading LLC | 31,526 | $141.2K | 0.00% | +31,526 | New |
| Dimensional Fund Advisors LP | 31,243 | $140.0K | 0.00% | −70,422−69.3% | Reduced |
| State Board of Administration of Florida Retirement System | 27,402 | $112.6K | 0.00% | −1,398−4.9% | Reduced |
| Aigen Investment Management, LP | 24,530 | $109.9K | 0.02% | +24,530 | New |
| Prio Wealth Limited Partnership | 23,529 | $105.4K | 0.00% | 00.0% | Unchanged |
| Jasper Ridge Partners, L.P. | 23,100 | $103.5K | 0.00% | 00.0% | Unchanged |
| ProShare Advisors LLC | 19,919 | $89.2K | 0.00% | +1,569+8.6% | Added |
| NEOS Investment Management LLC | 19,465 | $87.2K | 0.01% | +19,465 | New |
| Ameriprise Financial Inc | 17,910 | $80.2K | 0.00% | −23,094−56.3% | Reduced |
| Nisa Investment Advisors, LLC | 17,736 | $79.5K | 0.00% | +93+0.5% | Added |
| E Fund Management Co., Ltd. | 17,411 | $78.0K | 0.00% | +17,411 | New |
| Prudential Financial Inc | 17,335 | $77.7K | 0.00% | +17,335 | New |
| Oxford Asset Management LLP | 16,586 | $74.3K | 0.08% | +16,586 | New |
| Jump Financial, LLC | 16,261 | $72.8K | 0.00% | +16,261 | New |
| Grimes & Company, Inc. | 15,347 | $68.8K | 0.00% | −315−2.0% | Reduced |