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 2025
Institutional positions in Mersana Therapeutics, Inc. as of Mar 31, 2025. 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
- 111
- −19 vs. Q4 2024
- Shares held
- 87.8M
- −4.16M (−4.5%) vs. Q4 2024
- Total value
- $30.2M
- −$101.3M (−77.0%) vs. Q4 2024
- New holders
- 31
- 23 more added
- Sold out
- 50
- 32 more reduced
2 institutions that held it in Q4 2024 haven't filed for Q1 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2024: 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 2025
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q4 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| State Street Corp | 2,603,868 | $896.3K | 0.00% | −161,027−5.8% | Reduced |
| Acadian Asset Management LLC | 2,989,659 | $1.03M | 0.00% | +2,989,659 | New |
| Silverarc Capital Management, LLC | 3,088,505 | $1.06M | 0.22% | +3,088,505 | New |
| VR Adviser, LLC | 3,574,325 | $1.23M | 0.10% | −6,683,465−65.2% | Reduced |
| Rock Springs Capital Management LP | 3,814,684 | $1.31M | 0.08% | +383,000+11.2% | Added |
| AQR Capital Management LLC | 5,143,749 | $1.77M | 0.00% | +5,143,749 | New |
| Schonfeld Strategic Advisors LLC | 7,614,064 | $2.62M | 0.02% | +5,494,478+259.2% | Added |
| BlackRock, Inc. | 8,326,182 | $2.87M | 0.00% | −879,000−9.5% | Reduced |
| Vanguard Group Inc | 8,377,767 | $2.88M | 0.00% | +1,320,251+18.7% | Added |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $2.98M | 0.44% | 00.0% | Unchanged |
| Nextech Invest, Ltd. | 12,067,246 | $4.15M | 0.97% | +12,067,246 | New |
| EcoR1 Capital, LLC | 0 | $0 | 0.00% | −11,328,000−100.0% | Sold out |
| Novo Holdings A/S | 0 | $0 | 0.00% | −4,250,000−100.0% | Sold out |
| Boxer Capital Management, LLC | 0 | $0 | 0.00% | −2,635,000−100.0% | Sold out |
| Acuta Capital Partners, LLC | 0 | $0 | 0.00% | −1,120,500−100.0% | Sold out |
| Baker Bros. Advisors LP | 0 | $0 | 0.00% | −1,086,115−100.0% | Sold out |
| Octagon Capital Advisors LP | 0 | $0 | 0.00% | −992,000−100.0% | Sold out |
| Millennium Management LLC | 0 | $0 | 0.00% | −795,973−100.0% | Sold out |
| Sphera Funds Management Ltd. | 0 | $0 | 0.00% | −690,272−100.0% | Sold out |
| Wellington Management Group LLP | 0 | $0 | 0.00% | −576,148−100.0% | Sold out |
| D. E. Shaw & Co., Inc. | 0 | $0 | 0.00% | −544,463−100.0% | Sold out |
| HealthInvest Partners AB | 0 | $0 | 0.00% | −538,621−100.0% | Sold out |
| Gsa Capital Partners LLP | 0 | $0 | 0.00% | −508,296−100.0% | Sold out |
| Citadel Advisors LLC | 0 | $0 | 0.00% | −421,360−100.0% | Sold out |
| Verition Fund Management LLC | 0 | $0 | 0.00% | −336,806−100.0% | Sold out |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −194,153−100.0% | Sold out |
| Federated Hermes, Inc. | 0 | $0 | 0.00% | −183,723−100.0% | Sold out |
| Exome Asset Management LLC | 0 | $0 | 0.00% | −172,924−100.0% | Sold out |
| Los Angeles Capital Management LLC | 0 | $0 | 0.00% | −159,760−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −151,526−100.0% | Sold out |
| Mackenzie Financial Corp | 0 | $0 | 0.00% | −91,956−100.0% | Sold out |
| Susquehanna Fundamental Investments, LLC | 0 | $0 | 0.00% | −91,852−100.0% | Sold out |
| Exchange Traded Concepts, LLC | 0 | $0 | 0.00% | −85,006−100.0% | Sold out |
| MetLife Investment Management | 0 | $0 | 0.00% | −73,150−100.0% | Sold out |
| Oxford Asset Management LLP | 0 | $0 | 0.00% | −65,386−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −63,530−100.0% | Sold out |
| Avanza Fonder AB | 0 | $0 | 0.00% | −56,298−100.0% | Sold out |
| Ameriprise Financial Inc | 0 | $0 | 0.00% | −53,329−100.0% | Sold out |
| Prelude Capital Management, LLC | 0 | $0 | 0.00% | −51,357−100.0% | Sold out |
| Graham Capital Management, L.P. | 0 | $0 | 0.00% | −49,724−100.0% | Sold out |
| Cubist Systematic Strategies, LLC | 0 | $0 | 0.00% | −45,296−100.0% | Sold out |
| Atom Investors LP | 0 | $0 | 0.00% | −26,563−100.0% | Sold out |
| Quarry LP | 0 | $0 | 0.00% | −24,000−100.0% | Sold out |
| Public Employees Retirement System of Ohio | 0 | $0 | 0.00% | −20,587−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −17,084−100.0% | Sold out |
| US Bancorp | 0 | $0 | 0.00% | −16,178−100.0% | Sold out |
| Marshall Wace, LLP | 0 | $0 | 0.00% | −15,600−100.0% | Sold out |
| Aquatic Capital Management LLC | 0 | $0 | 0.00% | −14,551−100.0% | Sold out |
| Bayesian Capital Management, LP | 0 | $0 | 0.00% | −12,600−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −12,104−100.0% | Sold out |
| Lazard Asset Management LLC | 0 | $0 | 0.00% | −12,104−100.0% | Sold out |
| Russell Investments Group, Ltd. | 0 | $0 | 0.00% | −11,812−100.0% | Sold out |
| Wolverine Trading, LLC | 0 | $0 | 0.00% | −10,869−100.0% | Sold out |
| Smartleaf Asset Management LLC | 0 | $0 | 0.00% | −4,013−100.0% | Sold out |
| Picton Mahoney Asset Management | 0 | $0 | 0.00% | −2,871−100.0% | Sold out |
| Skopos Labs, Inc. | 0 | $0 | 0.00% | −2,517−100.0% | Sold out |
| Point72 (DIFC) Ltd | 0 | $0 | 0.00% | −2,203−100.0% | Sold out |
| R Squared Ltd | 0 | $0 | 0.00% | −1,060−100.0% | Sold out |
| Signaturefd, LLC | 0 | $0 | 0.00% | −286−100.0% | Sold out |
| IFP Advisors, Inc | 0 | $0 | 0.00% | −2−100.0% | Sold out |
| Point72 Asia (Singapore) Pte. Ltd. | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Nextech Invest AG | – | – | – | – | Not filed |
| Nuveen Asset Management, LLC | – | – | – | – | Not filed |