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 |
|---|---|---|---|---|---|
| UBS Group AG | 185,399 | $762.0K | 0.00% | −103,204−35.8% | Reduced |
| Barclays PLC | 198,033 | $813.9K | 0.00% | −34,055−14.7% | Reduced |
| Gsa Capital Partners LLP | 204,476 | $840.0K | 0.08% | +172,235+534.2% | Added |
| Two Sigma Investments, LP | 204,584 | $840.8K | 0.00% | −413,245−66.9% | Reduced |
| Panagora Asset Management Inc | 216,197 | $888.6K | 0.01% | +25,234+13.2% | Added |
| BNP Paribas Arbitrage, SA | 221,708 | $911.2K | 0.00% | +99,032+80.7% | Added |
| Walleye Capital LLC | 223,388 | $918.1K | 0.02% | +223,388 | New |
| Qube Research & Technologies Ltd | 251,796 | $1.03M | 0.01% | +165,410+191.5% | Added |
| Susquehanna International Group, LLP | 274,286 | $1.13M | 0.00% | +234,334+586.5% | Added |
| Platinum Investment Management Ltd | 290,298 | $1.19M | 0.04% | 00.0% | Unchanged |
| Caption Management, LLC | 295,900 | $1.22M | 0.26% | +295,900 | New |
| Cubist Systematic Strategies, LLC | 310,941 | $1.28M | 0.01% | −116,211−27.2% | Reduced |
| Hudson Bay Capital Management LP | 325,000 | $1.34M | 0.01% | +50,000+18.2% | Added |
| Rhenman & Partners Asset Management AB | 350,000 | $1.40M | 0.15% | −50,000−12.5% | Reduced |
| 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 |
| Bank of New York Mellon Corp | 369,786 | $1.52M | 0.00% | +1,757+0.5% | Added |
| Lion Point Capital, LP | 409,120 | $1.68M | 0.93% | +409,120 | New |
| Citigroup Inc | 419,272 | $1.72M | 0.00% | +225,800+116.7% | Added |
| Dimensional Fund Advisors LP | 419,337 | $1.72M | 0.00% | −70,446−14.4% | Reduced |
| UBS Oconnor LLC | 462,699 | $1.90M | 0.05% | +462,699 | New |
| CIBC Asset Management Inc | 476,684 | $1.96M | 0.01% | −90,101−15.9% | Reduced |
| Rafferty Asset Management, LLC | 485,708 | $2.00M | 0.01% | +68,844+16.5% | Added |
| Kennedy Capital Management, Inc. | 492,064 | $2.02M | 0.06% | +53,082+12.1% | Added |
| Voya Investment Management LLC | 502,159 | $2.06M | 0.00% | +215,265+75.0% | Added |
| DAFNA Capital Management LLC | 510,863 | $2.10M | 0.63% | +97,400+23.6% | Added |
| Silverarc Capital Management, LLC | 540,059 | $2.22M | 1.00% | −600,123−52.6% | Reduced |
| Hillsdale Investment Management Inc. | 693,200 | $2.85M | 0.24% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 729,671 | $3.00M | 0.00% | +58,644+8.7% | Added |
| Two Sigma Advisers, LP | 804,500 | $3.31M | 0.01% | −248,800−23.6% | Reduced |
| Northern Trust Corp | 884,633 | $3.64M | 0.00% | −19,743−2.2% | Reduced |
| Decheng Capital Management III (Cayman), LLC | 904,268 | $3.72M | 1.50% | 00.0% | Unchanged |
| Bank of America Corp | 1,015,884 | $4.18M | 0.00% | +255,161+33.5% | Added |
| Deutsche Bank AG | 1,147,554 | $4.72M | 0.00% | +16,850+1.5% | Added |
| 5AM Venture Management, LLC | 1,185,000 | $4.87M | 1.25% | +1,185,000 | New |
| Ally Bridge Group (NY) LLC | 1,191,271 | $4.90M | 6.42% | 00.0% | Unchanged |
| Nuveen Asset Management, LLC | 1,241,487 | $5.10M | 0.00% | +12,080+1.0% | Added |
| Renaissance Technologies LLC | 1,250,519 | $5.14M | 0.01% | +678,800+118.7% | Added |
| Millennium Management LLC | 1,261,054 | $5.18M | 0.01% | −2,402,473−65.6% | Reduced |
| Geode Capital Management, LLC | 1,798,847 | $7.39M | 0.00% | +91,377+5.4% | Added |
| D. E. Shaw & Co., Inc. | 1,806,099 | $7.42M | 0.01% | −529,840−22.7% | Reduced |
| Baker Bros. Advisors LP | 1,886,115 | $7.75M | 0.04% | +1,886,115 | New |
| Morgan Stanley | 1,898,633 | $7.80M | 0.00% | +140,647+8.0% | Added |
| Artal Group S.A. | 2,215,788 | $9.11M | 0.54% | +15,788+0.7% | Added |
| Marshall Wace, LLP | 2,496,710 | $10.3M | 0.03% | −27,274−1.1% | Reduced |
| Candriam Luxembourg S.C.A. | 2,962,848 | $11.2M | 0.08% | +270,000+10.0% | Added |
| Goldman Sachs Group Inc | 2,939,540 | $12.1M | 0.00% | +925,044+45.9% | Added |
| Braidwell LP | 3,355,805 | $13.8M | 0.45% | +1,493,105+80.2% | Added |
| Avidity Partners Management LP | 3,433,233 | $14.1M | 0.47% | +3,433,233 | New |
| Sarissa Capital Management LP | 3,800,000 | $15.6M | 2.00% | −197,010−4.9% | Reduced |
| Rock Springs Capital Management LP | 4,103,803 | $16.9M | 0.40% | 00.0% | Unchanged |
| Bellevue Group AG | 4,299,619 | $17.7M | 0.26% | +17,019+0.4% | Added |
| Vanguard Group Inc | 4,638,492 | $19.1M | 0.00% | +189,452+4.3% | Added |
| State Street Corp | 6,412,222 | $26.4M | 0.00% | +556,161+9.5% | Added |
| BlackRock Inc. | 7,473,822 | $30.7M | 0.00% | −18,107−0.2% | Reduced |
| Avoro Capital Advisors LLC | 7,550,000 | $31.0M | 0.46% | 00.0% | Unchanged |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $35.6M | 4.45% | 00.0% | Unchanged |
| OrbiMed Advisors LLC | 9,011,437 | $37.0M | 0.73% | 00.0% | Unchanged |
| Woodline Partners LP | 0 | $0 | 0.00% | −523,408−100.0% | Sold out |
| LMR Partners LLP | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Opaleye Management Inc. | 0 | $0 | 0.00% | −460,000−100.0% | Sold out |
| Fred Alger Management, LLC | 0 | $0 | 0.00% | −378,450−100.0% | Sold out |
| AXA S.A. | 0 | $0 | 0.00% | −104,100−100.0% | Sold out |
| Voloridge Investment Management, LLC | 0 | $0 | 0.00% | −75,216−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −64,613−100.0% | Sold out |
| Harvest Investment Services, LLC | 0 | $0 | 0.00% | −59,563−100.0% | Sold out |
| Oversea-Chinese Banking CORP Ltd | 0 | $0 | 0.00% | −42,500−100.0% | Sold out |
| Ameriprise Financial Inc | 0 | $0 | 0.00% | −27,044−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −24,652−100.0% | Sold out |
| Boulder Hill Capital Management LP | 0 | $0 | 0.00% | −23,000−100.0% | Sold out |
| Raymond James & Associates | 0 | $0 | 0.00% | −19,431−100.0% | Sold out |
| Two Sigma Securities, LLC | 0 | $0 | 0.00% | −15,226−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −11,210−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −6,597−100.0% | Sold out |
| Dorsey Wright & Associates | 0 | $0 | 0.00% | −2,988−100.0% | Sold out |
| Lindbrook Capital, LLC | 0 | $0 | 0.00% | −445−100.0% | Sold out |
| Steward Partners Investment Advisory, LLC | 0 | $0 | 0.00% | −225−100.0% | Sold out |
| Alpha Paradigm Partners, LLC | – | – | – | – | Not filed |