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 |
|---|---|---|---|---|---|
| Rhenman & Partners Asset Management AB | 400,000 | $1.32M | 0.14% | +50,000+14.3% | Added |
| Squarepoint Ops LLC | 418,224 | $1.38M | 0.01% | +405,988+3,318.0% | Added |
| Sphera Funds Management Ltd. | 418,562 | $1.38M | 0.30% | +407,941+3,840.9% | Added |
| Tri Locum Partners LP | 428,307 | $1.41M | 0.52% | +428,307 | New |
| Adage Capital Partners GP, L.L.C. | 500,000 | $1.65M | 0.00% | +500,000 | New |
| Kennedy Capital Management, Inc. | 555,279 | $1.83M | 0.04% | +63,215+12.8% | Added |
| Readystate Asset Management LP | 567,300 | $1.87M | 0.19% | +567,300 | New |
| First Manhattan Co | 569,594 | $1.87M | 0.01% | +569,594 | New |
| Ameriprise Financial Inc | 572,273 | $1.88M | 0.00% | +572,273 | New |
| Two Sigma Advisers, LP | 578,100 | $1.90M | 0.00% | −226,400−28.1% | Reduced |
| RTW Investments, LP | 614,838 | $2.02M | 0.04% | +614,838 | New |
| Morgan Stanley | 764,511 | $2.52M | 0.00% | −1,134,122−59.7% | Reduced |
| DAFNA Capital Management LLC | 810,845 | $2.67M | 0.73% | +299,982+58.7% | Added |
| Charles Schwab Investment Management Inc | 820,688 | $2.70M | 0.00% | +91,017+12.5% | Added |
| Decheng Capital Management III (Cayman), LLC | 904,268 | $2.98M | 0.93% | 00.0% | Unchanged |
| Hudson Bay Capital Management LP | 962,359 | $3.17M | 0.03% | +637,359+196.1% | Added |
| D. E. Shaw & Co., Inc. | 985,739 | $3.24M | 0.01% | −820,360−45.4% | 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 |
| Renaissance Technologies LLC | 1,047,919 | $3.45M | 0.00% | −202,600−16.2% | Reduced |
| Baker Bros. Advisors LP | 1,086,115 | $3.57M | 0.02% | −800,000−42.4% | Reduced |
| Northern Trust Corp | 1,099,101 | $3.62M | 0.00% | +214,468+24.2% | Added |
| Deutsche Bank AG | 1,137,743 | $3.74M | 0.00% | −9,811−0.9% | Reduced |
| Nuveen Asset Management, LLC | 1,241,591 | $4.08M | 0.00% | +1040.0% | Added |
| 5AM Venture Management, LLC | 1,305,000 | $4.29M | 1.07% | +120,000+10.1% | Added |
| Goldman Sachs Group Inc | 1,396,018 | $4.59M | 0.00% | −1,543,522−52.5% | Reduced |
| JPMorgan Chase & Co | 1,443,794 | $4.75M | 0.00% | +1,322,229+1,087.7% | Added |
| FMR LLC | 1,479,497 | $4.87M | 0.00% | +1,355,682+1,094.9% | Added |
| Redmile Group, LLC | 1,698,626 | $5.59M | 0.21% | +1,698,626 | New |
| Millennium Management LLC | 1,871,917 | $6.16M | 0.01% | +610,863+48.4% | Added |
| Geode Capital Management, LLC | 2,005,682 | $6.60M | 0.00% | +206,835+11.5% | Added |
| Candriam Luxembourg S.C.A. | 2,415,477 | $7.95M | 0.06% | −547,371−18.5% | Reduced |
| Sarissa Capital Management LP | 2,632,900 | $8.66M | 0.86% | −1,167,100−30.7% | Reduced |
| Marshall Wace, LLP | 2,711,310 | $8.92M | 0.02% | +214,600+8.6% | Added |
| Logos Global Management LP | 2,800,000 | $9.21M | 1.27% | +2,800,000 | New |
| Deerfield Management Company, L.P. (Series C) | 2,885,400 | $9.49M | 0.20% | +2,885,400 | New |
| Artal Group S.A. | 3,029,555 | $9.97M | 0.32% | +813,767+36.7% | Added |
| Rock Springs Capital Management LP | 3,403,133 | $11.2M | 0.27% | −700,670−17.1% | Reduced |
| Avidity Partners Management LP | 3,790,000 | $12.5M | 0.44% | +356,767+10.4% | Added |
| Balyasny Asset Management LLC | 4,839,515 | $15.9M | 0.04% | +4,839,515 | New |
| State Street Corp | 4,905,149 | $16.1M | 0.00% | −1,507,073−23.5% | Reduced |
| Bellevue Group AG | 5,219,425 | $17.2M | 0.24% | +919,806+21.4% | Added |
| Vanguard Group Inc | 5,724,619 | $18.8M | 0.00% | +1,086,127+23.4% | Added |
| Avoro Capital Advisors LLC | 6,375,000 | $21.0M | 0.28% | −1,175,000−15.6% | Reduced |
| OrbiMed Advisors LLC | 7,214,937 | $23.7M | 0.46% | −1,796,500−19.9% | Reduced |
| BlackRock Inc. | 7,963,982 | $26.2M | 0.00% | +490,160+6.6% | Added |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $28.5M | 2.94% | 00.0% | Unchanged |
| Braidwell LP | 0 | $0 | 0.00% | −3,355,805−100.0% | Sold out |
| Ally Bridge Group (NY) LLC | 0 | $0 | 0.00% | −1,191,271−100.0% | Sold out |
| Hillsdale Investment Management Inc. | 0 | $0 | 0.00% | −693,200−100.0% | Sold out |
| CIBC Asset Management Inc | 0 | $0 | 0.00% | −476,684−100.0% | Sold out |
| UBS Oconnor LLC | 0 | $0 | 0.00% | −462,699−100.0% | Sold out |
| Lion Point Capital, LP | 0 | $0 | 0.00% | −409,120−100.0% | Sold out |
| Sectoral Asset Management Inc | 0 | $0 | 0.00% | −343,079−100.0% | Sold out |
| Vontobel Holding Ltd. | 0 | $0 | 0.00% | −343,079−100.0% | Sold out |
| Platinum Investment Management Ltd | 0 | $0 | 0.00% | −290,298−100.0% | Sold out |
| Tekla Capital Management LLC | 0 | $0 | 0.00% | −162,383−100.0% | Sold out |
| Allianz Asset Management GmbH | 0 | $0 | 0.00% | −90,500−100.0% | Sold out |
| HAP Trading, LLC | 0 | $0 | 0.00% | −89,563−100.0% | Sold out |
| Healthcare of Ontario Pension Plan Trust Fund | 0 | $0 | 0.00% | −84,000−100.0% | Sold out |
| Trexquant Investment LP | 0 | $0 | 0.00% | −80,438−100.0% | Sold out |
| Mackenzie Financial Corp | 0 | $0 | 0.00% | −68,822−100.0% | Sold out |
| Jacobs Levy Equity Management, Inc | 0 | $0 | 0.00% | −65,891−100.0% | Sold out |
| Los Angeles Capital Management LLC | 0 | $0 | 0.00% | −61,790−100.0% | Sold out |
| Acuta Capital Partners, LLC | 0 | $0 | 0.00% | −60,000−100.0% | Sold out |
| Occudo Quantitative Strategies LP | 0 | $0 | 0.00% | −59,411−100.0% | Sold out |
| Connor, Clark & Lunn Investment Management Ltd. | 0 | $0 | 0.00% | −59,051−100.0% | Sold out |
| Prudential Financial Inc | 0 | $0 | 0.00% | −51,155−100.0% | Sold out |
| SG Americas Securities, LLC | 0 | $0 | 0.00% | −46,605−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −45,738−100.0% | Sold out |
| CM Wealth Advisors LLC | 0 | $0 | 0.00% | −45,367−100.0% | Sold out |
| Cornercap Investment Counsel Inc | 0 | $0 | 0.00% | −42,633−100.0% | Sold out |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −40,034−100.0% | Sold out |
| SEI Investments Co | 0 | $0 | 0.00% | −28,977−100.0% | Sold out |
| Man Group plc | 0 | $0 | 0.00% | – | Sold out |
| Bayesian Capital Management, LP | 0 | $0 | 0.00% | −24,800−100.0% | Sold out |
| Walleye Trading LLC | 0 | $0 | 0.00% | −21,415−100.0% | Sold out |
| Aquatic Capital Management LLC | 0 | $0 | 0.00% | −21,500−100.0% | Sold out |
| Bank of Montreal | 0 | $0 | 0.00% | −20,501−100.0% | Sold out |
| BIT Capital GmbH | 0 | $0 | 0.00% | −16,931−100.0% | Sold out |
| Point72 Middle East FZE | 0 | $0 | 0.00% | −15,976−100.0% | Sold out |
| Nebula Research & Development LLC | 0 | $0 | 0.00% | −15,702−100.0% | Sold out |
| Pictet Asset Management SA | 0 | $0 | 0.00% | −11,490−100.0% | Sold out |
| Lazard Asset Management LLC | 0 | $0 | 0.00% | −10,821−100.0% | Sold out |
| Wolverine Trading, LLC | 0 | $0 | 0.00% | −10,259−100.0% | Sold out |
| Public Employees Retirement System of Ohio | 0 | $0 | 0.00% | −1,175−100.0% | Sold out |
| TCI Wealth Advisors, Inc. | 0 | $0 | 0.00% | −986−100.0% | Sold out |
| Cutler Group LP | 0 | $0 | 0.00% | −1,200−100.0% | Sold out |
| Quadrant Capital Group LLC | 0 | $0 | 0.00% | −116−100.0% | Sold out |
| Ellevest, Inc. | 0 | $0 | 0.00% | −57−100.0% | Sold out |
| Capital Advisors, Ltd. LLC | 0 | $0 | 0.00% | −71−100.0% | Sold out |