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 |
|---|---|---|---|---|---|
| Octagon Capital Advisors LP | 1,000,000 | $4.48M | 0.54% | +1,000,000 | New |
| Schonfeld Strategic Advisors LLC | 1,008,658 | $4.52M | 0.04% | −130,749−11.5% | Reduced |
| Baker Bros. Advisors LP | 1,086,115 | $4.87M | 0.06% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 1,222,623 | $5.48M | 0.01% | +555,240+83.2% | Added |
| 5AM Venture Management, LLC | 1,305,000 | $5.85M | 1.31% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 1,427,340 | $6.39M | 0.00% | +1,348,517+1,710.8% | Added |
| Renaissance Technologies LLC | 1,427,819 | $6.40M | 0.01% | +562,088+64.9% | Added |
| Millennium Management LLC | 1,507,580 | $6.75M | 0.01% | −1,886,860−55.6% | Reduced |
| Deutsche Bank AG | 1,585,263 | $7.10M | 0.00% | +446,031+39.2% | Added |
| Acuta Capital Partners, LLC | 2,164,628 | $9.70M | 6.30% | −203,372−8.6% | Reduced |
| Geode Capital Management, LLC | 2,358,221 | $10.6M | 0.00% | +61,085+2.7% | Added |
| Cormorant Asset Management, LP | 2,600,000 | $11.6M | 0.51% | +2,600,000 | New |
| Woodline Partners LP | 2,934,622 | $13.1M | 0.12% | +2,934,622 | New |
| Morgan Stanley | 2,942,677 | $13.2M | 0.00% | −1,191,869−28.8% | Reduced |
| Silverarc Capital Management, LLC | 2,968,798 | $13.3M | 3.73% | −3,451,338−53.8% | Reduced |
| Rock Springs Capital Management LP | 3,046,782 | $13.6M | 0.35% | 00.0% | Unchanged |
| Citadel Advisors LLC | 3,458,985 | $15.5M | 0.01% | +1,532,054+79.5% | Added |
| Balyasny Asset Management LLC | 3,655,998 | $16.4M | 0.04% | −6,042,149−62.3% | Reduced |
| Nextech Invest AG | 3,856,321 | $17.3M | 2.74% | −2,122,006−35.5% | Reduced |
| State Street Corp | 5,497,443 | $24.6M | 0.00% | +3,168,009+136.0% | Added |
| Vanguard Group Inc | 6,274,370 | $28.1M | 0.00% | +36,782+0.6% | Added |
| BlackRock Inc. | 8,095,729 | $36.3M | 0.00% | +251,447+3.2% | Added |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $38.8M | 3.12% | 00.0% | Unchanged |
| VR Adviser, LLC | 11,328,000 | $50.7M | 2.41% | 00.0% | Unchanged |
| EcoR1 Capital, LLC | 19,364,688 | $86.8M | 2.21% | 00.0% | Unchanged |
| Philosophy Capital Management LLC | 0 | $0 | 0.00% | −1,264,567−100.0% | Sold out |
| Readystate Asset Management LP | 0 | $0 | 0.00% | −295,038−100.0% | Sold out |
| Foundations Investment Advisors, LLC | 0 | $0 | 0.00% | −102,000−100.0% | Sold out |
| Amundi | 0 | $0 | 0.00% | −95,540−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −105,815−100.0% | Sold out |
| LPL Financial LLC | 0 | $0 | 0.00% | −76,694−100.0% | Sold out |
| Harbor Capital Advisors, Inc. | 0 | $0 | 0.00% | −47,472−100.0% | Sold out |
| Man Group plc | 0 | $0 | 0.00% | −44,600−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −43,694−100.0% | Sold out |
| AQR Capital Management LLC | 0 | $0 | 0.00% | −31,559−100.0% | Sold out |
| Group One Trading, L.P. | 0 | $0 | 0.00% | −31,081−100.0% | Sold out |
| Point72 Middle East FZE | 0 | $0 | 0.00% | −25,511−100.0% | Sold out |
| Pale Fire Capital SE | 0 | $0 | 0.00% | −25,400−100.0% | Sold out |
| Public Employees Retirement System of Ohio | 0 | $0 | 0.00% | −15,800−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −13,668−100.0% | Sold out |
| Bayesian Capital Management, LP | 0 | $0 | 0.00% | −11,900−100.0% | Sold out |
| Graham Capital Management, L.P. | 0 | $0 | 0.00% | −11,811−100.0% | Sold out |
| Quantbot Technologies LP | 0 | $0 | 0.00% | −10,945−100.0% | Sold out |
| Advisory Services Network, LLC | 0 | $0 | 0.00% | −100−100.0% | Sold out |