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 2022
Institutional positions in Mersana Therapeutics, Inc. as of Mar 31, 2022. 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
- +6 vs. Q4 2021
- Shares held
- 80.9M
- +10.7M (+15.2%) vs. Q4 2021
- Total value
- $322.7M
- −$113.9M (−26.1%) vs. Q4 2021
- New holders
- 21
- 49 more added
- Sold out
- 15
- 38 more reduced
Compare with Q4 2021: 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 2022
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q4 2021.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock Inc. | 7,626,196 | $30.4M | 0.00% | +146,967+2.0% | Added |
| Avoro Capital Advisors LLC | 6,800,000 | $27.1M | 0.50% | 00.0% | Unchanged |
| Bain Capital Life Sciences Investors, LLC | 6,522,030 | $26.0M | 2.53% | +1,136,363+21.1% | Added |
| Millennium Management LLC | 4,883,749 | $19.5M | 0.02% | +4,247,665+667.8% | Added |
| OrbiMed Advisors LLC | 4,788,900 | $19.1M | 0.31% | +1,900,053+65.8% | Added |
| Sarissa Capital Management LP | 4,299,297 | $17.2M | 1.62% | 00.0% | Unchanged |
| Bellevue Group AG | 3,954,000 | $15.8M | 0.18% | −210,000−5.0% | Reduced |
| Rock Springs Capital Management LP | 3,755,820 | $15.0M | 0.38% | +506,870+15.6% | Added |
| Vanguard Group Inc | 3,435,270 | $13.7M | 0.00% | −172,161−4.8% | Reduced |
| Artal Group S.A. | 2,200,000 | $8.78M | 0.37% | +1,000,000+83.3% | Added |
| Morgan Stanley | 2,171,373 | $8.66M | 0.00% | +942,766+76.7% | Added |
| D. E. Shaw & Co., Inc. | 2,090,866 | $8.34M | 0.01% | +1,445,963+224.2% | Added |
| Candriam Luxembourg S.C.A. | 1,844,823 | $7.36M | 0.05% | −178,072−8.8% | Reduced |
| Goldman Sachs Group Inc | 1,650,752 | $6.59M | 0.00% | +441,140+36.5% | Added |
| State Street Corp | 1,352,150 | $5.39M | 0.00% | −2,868,407−68.0% | Reduced |
| Two Sigma Advisers, LP | 1,349,500 | $5.38M | 0.01% | +299,300+28.5% | Added |
| Two Sigma Investments, LP | 1,275,634 | $5.09M | 0.02% | +397,882+45.3% | Added |
| Bank of Montreal | 1,157,635 | $4.67M | 0.00% | +1,157,635 | New |
| Geode Capital Management, LLC | 1,166,807 | $4.66M | 0.00% | +29,806+2.6% | Added |
| Deutsche Bank AG | 1,155,677 | $4.61M | 0.00% | +1,078,665+1,400.6% | Added |
| CIBC Asset Management Inc | 1,055,994 | $4.21M | 0.01% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 919,200 | $3.67M | 0.00% | +576,600+168.3% | Added |
| Decheng Capital Management III (Cayman), LLC | 904,268 | $3.61M | 1.11% | +904,268 | New |
| Rho Capital Partners Inc | 796,458 | $3.18M | 2.20% | 00.0% | Unchanged |
| Northern Trust Corp | 724,255 | $2.89M | 0.00% | −23,621−3.2% | Reduced |
| Federated Hermes, Inc. | 723,933 | $2.89M | 0.01% | +521,350+257.4% | Added |
| Opaleye Management Inc. | 710,000 | $2.83M | 0.88% | +710,000 | New |
| Citadel Advisors LLC | 686,689 | $2.74M | 0.00% | +378,182+122.6% | Added |
| BNP Paribas Arbitrage, SA | 652,613 | $2.60M | 0.01% | +34,197+5.5% | Added |
| Platinum Investment Management Ltd | 495,481 | $1.98M | 0.06% | 00.0% | Unchanged |
| Squarepoint Ops LLC | 488,997 | $1.95M | 0.01% | +422,325+633.4% | Added |
| Wellington Management Group LLP | 480,644 | $1.92M | 0.00% | −4,536,434−90.4% | Reduced |
| Charles Schwab Investment Management Inc | 464,660 | $1.85M | 0.00% | −23,345−4.8% | Reduced |
| Hudson Bay Capital Management LP | 435,000 | $1.74M | 0.02% | +145,000+50.0% | Added |
| Pinz Capital Management, LP | 400,000 | $1.60M | 1.00% | +400,000 | New |
| Walleye Capital LLC | 394,250 | $1.57M | 0.05% | −510−0.1% | Reduced |
| Healthcare of Ontario Pension Plan Trust Fund | 379,000 | $1.51M | 0.01% | +379,000 | New |
| DAFNA Capital Management LLC | 352,763 | $1.41M | 0.37% | +212,500+151.5% | Added |
| EcoR1 Capital, LLC | 326,578 | $1.30M | 0.04% | +326,578 | New |
| PDT Partners, LLC | 326,419 | $1.30M | 0.11% | +214,749+192.3% | Added |
| Fred Alger Management, LLC | 323,068 | $1.29M | 0.00% | +94,578+41.4% | Added |
| JPMorgan Chase & Co | 309,629 | $1.24M | 0.00% | +278,047+880.4% | Added |
| Nuveen Asset Management, LLC | 299,450 | $1.20M | 0.00% | +6,493+2.2% | Added |
| Qube Research & Technologies Ltd | 299,454 | $1.20M | 0.01% | +241,697+418.5% | Added |
| Cubist Systematic Strategies, LLC | 285,994 | $1.14M | 0.01% | +173,682+154.6% | Added |
| Bank of New York Mellon Corp | 283,095 | $1.13M | 0.00% | +3,165+1.1% | Added |
| ExodusPoint Capital Management, LP | 277,089 | $1.11M | 0.02% | +246,678+811.1% | Added |
| Allianz Asset Management GmbH | 208,520 | $832.0K | 0.00% | −65,848−24.0% | Reduced |
| State of Wisconsin Investment Board | 195,300 | $779.0K | 0.00% | +123,700+172.8% | Added |
| Dimensional Fund Advisors LP | 186,040 | $742.0K | 0.00% | −8,476−4.4% | Reduced |
| HRT Financial LP | 176,078 | $702.0K | 0.01% | +59,156+50.6% | Added |
| Susquehanna International Group, LLP | 173,786 | $693.0K | 0.00% | +51,829+42.5% | Added |
| Macquarie Group Ltd | 154,418 | $617.0K | 0.00% | 00.0% | Unchanged |
| Jane Street Group, LLC | 143,321 | $572.0K | 0.00% | +91,798+178.2% | Added |
| Price T Rowe Associates Inc | 138,034 | $551.0K | 0.00% | +23,587+20.6% | Added |
| Occudo Quantitative Strategies LP | 138,216 | $551.0K | 0.05% | +138,216 | New |
| Swiss National Bank | 135,996 | $543.0K | 0.00% | +9,600+7.6% | Added |
| FMR LLC | 126,703 | $505.0K | 0.00% | +5,016+4.1% | Added |
| UBS Asset Management Americas Inc | 88,374 | $352.6K | 0.00% | +44,955+103.5% | Added |
| California State Teachers Retirement System | 80,349 | $321.0K | 0.00% | −6,897−7.9% | Reduced |
| Rhumbline Advisers | 79,885 | $319.0K | 0.00% | −892−1.1% | Reduced |
| Gsa Capital Partners LLP | 78,706 | $314.0K | 0.04% | −8,359−9.6% | Reduced |
| Alliancebernstein L.P. | 77,300 | $308.0K | 0.00% | +200+0.3% | Added |
| Credit Suisse AG | 75,957 | $304.0K | 0.00% | +9,236+13.8% | Added |
| Tudor Investment Corp Et Al | 67,991 | $271.0K | 0.01% | +67,991 | New |
| Jump Financial, LLC | 67,500 | $269.0K | 0.01% | −5,400−7.4% | Reduced |
| QVT Financial LP | 62,657 | $250.0K | 0.01% | 00.0% | Unchanged |
| Walleye Trading LLC | 61,525 | $245.0K | 0.01% | −190−0.3% | Reduced |
| Man Group plc | 57,000 | $227.0K | 0.00% | +57,000 | New |
| Russell Investments Group, Ltd. | 56,458 | $224.0K | 0.00% | +56,458 | New |
| Schonfeld Strategic Advisors LLC | 52,900 | $211.0K | 0.00% | +52,900 | New |
| New York State Common Retirement Fund | 48,823 | $195.0K | 0.00% | −2,985−5.8% | Reduced |
| Nisa Investment Advisors, LLC | 48,710 | $194.0K | 0.00% | +48,100+7,885.2% | Added |
| Barclays PLC | 41,574 | $166.0K | 0.00% | −48,545−53.9% | Reduced |
| American International Group, Inc. | 35,533 | $142.0K | 0.00% | −2,501−6.6% | Reduced |
| Bank of America Corp | 34,505 | $138.0K | 0.00% | −8,342−19.5% | Reduced |
| Marshall Wace, LLP | 32,667 | $130.0K | 0.00% | +32,667 | New |
| Manufacturers Life Insurance Company, The | 31,360 | $125.1K | 0.00% | −7,214−18.7% | Reduced |
| Invesco Ltd. | 30,068 | $120.0K | 0.00% | +350+1.2% | Added |
| Parametric Portfolio Associates LLC | 29,837 | $119.0K | 0.00% | +251+0.8% | Added |
| Balyasny Asset Management LLC | 28,525 | $114.0K | 0.00% | +13,895+95.0% | Added |
| Virtus ETF Advisers LLC | 28,294 | $113.0K | 0.05% | −1,680−5.6% | Reduced |
| State Board of Administration of Florida Retirement System | 27,282 | $109.0K | 0.00% | 00.0% | Unchanged |
| Voya Investment Management LLC | 26,326 | $105.0K | 0.00% | 00.0% | Unchanged |
| Legal & General Group Plc | 25,295 | $101.0K | 0.00% | +181+0.7% | Added |
| MetLife Investment Management | 24,973 | $99.6K | 0.00% | −2,050−7.6% | Reduced |
| Prio Wealth Limited Partnership | 23,529 | $94.0K | 0.00% | 00.0% | Unchanged |
| Jasper Ridge Partners, L.P. | 23,100 | $92.0K | 0.00% | 00.0% | Unchanged |
| ProShare Advisors LLC | 22,048 | $88.0K | 0.00% | −3,719−14.4% | Reduced |
| Group One Trading, L.P. | 18,123 | $72.0K | 0.00% | +16,800+1,269.8% | Added |
| Wells Fargo & Company | 17,734 | $71.0K | 0.00% | −24,008−57.5% | Reduced |
| Dynamic Technology Lab Private Ltd | 17,027 | $68.0K | 0.01% | −15,844−48.2% | Reduced |
| Simplex Trading, LLC | 17,180 | $68.0K | 0.00% | +17,180 | New |
| Arizona State Retirement System | 15,551 | $62.0K | 0.00% | +100+0.6% | Added |
| UBS Group AG | 15,124 | $60.0K | 0.00% | −166,039−91.7% | Reduced |
| Point72 Hong Kong Ltd | 14,280 | $57.0K | 0.01% | +5,107+55.7% | Added |
| Grimes & Company, Inc. | 14,369 | $57.0K | 0.00% | +14,369 | New |
| Virtu Financial LLC | 13,274 | $53.0K | 0.00% | +13,274 | New |
| AQR Capital Management LLC | 12,712 | $51.0K | 0.00% | +12,712 | New |
| Martingale Asset Management L P | 12,045 | $49.0K | 0.00% | 00.0% | Unchanged |