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, Q3 2021
Institutional positions in Mersana Therapeutics, Inc. as of Sep 30, 2021. 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
- 110
- −20 vs. Q2 2021
- Shares held
- 68.7M
- −108.9K (−0.2%) vs. Q2 2021
- Total value
- $648.3M
- −$286.2M (−30.6%) vs. Q2 2021
- New holders
- 12
- 45 more added
- Sold out
- 32
- 34 more reduced
1 institution that held it in Q2 2021 haven't filed for Q3 2021 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2021
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q2 2021.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| OrbiMed Advisors LLC | 2,888,847 | $27.2M | 0.30% | +88,600+3.2% | Added |
| Rock Springs Capital Management LP | 3,020,702 | $28.5M | 0.60% | +175,084+6.2% | Added |
| Vanguard Group Inc | 3,681,594 | $34.7M | 0.00% | +500,009+15.7% | Added |
| Bain Capital Life Sciences Investors, LLC | 3,695,667 | $34.9M | 2.16% | 00.0% | Unchanged |
| State Street Corp | 4,090,196 | $38.6M | 0.00% | +843,673+26.0% | Added |
| Bellevue Group AG | 4,261,000 | $40.2M | 0.41% | +1,320,000+44.9% | Added |
| Sarissa Capital Management LP | 4,299,297 | $40.5M | 3.18% | +293,697+7.3% | Added |
| Wellington Management Group LLP | 6,007,375 | $56.6M | 0.01% | −869,961−12.6% | Reduced |
| Avoro Capital Advisors LLC | 6,800,000 | $64.1M | 1.01% | 00.0% | Unchanged |
| BlackRock Inc. | 8,807,328 | $83.1M | 0.00% | −15,376−0.2% | Reduced |
| Westfield Capital Management Co LP | 0 | $0 | 0.00% | −2,108,810−100.0% | Sold out |
| Ghost Tree Capital, LLC | 0 | $0 | 0.00% | −450,000−100.0% | Sold out |
| Commodore Capital LP | 0 | $0 | 0.00% | −429,228−100.0% | Sold out |
| Sio Capital Management, LLC | 0 | $0 | 0.00% | −157,259−100.0% | Sold out |
| STRS Ohio | 0 | $0 | 0.00% | −153,742−100.0% | Sold out |
| Silverarc Capital Management, LLC | 0 | $0 | 0.00% | −125,123−100.0% | Sold out |
| Comerica Bank | 0 | $0 | 0.00% | −147,312−100.0% | Sold out |
| Bailard, Inc. | 0 | $0 | 0.00% | −111,000−100.0% | Sold out |
| Maven Securities LTD | 0 | $0 | 0.00% | −84,469−100.0% | Sold out |
| Affinity Asset Advisors, LLC | 0 | $0 | 0.00% | −85,000−100.0% | Sold out |
| Qube Research & Technologies Ltd | 0 | $0 | 0.00% | −62,685−100.0% | Sold out |
| HighVista Strategies LLC | 0 | $0 | 0.00% | −59,906−100.0% | Sold out |
| Caption Management, LLC | 0 | $0 | 0.00% | −54,700−100.0% | Sold out |
| FIL Ltd | 0 | $0 | 0.00% | −52,415−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −43,592−100.0% | Sold out |
| Squarepoint Ops LLC | 0 | $0 | 0.00% | −42,507−100.0% | Sold out |
| Skandinaviska Enskilda Banken AB (publ) | 0 | $0 | 0.00% | −30,304−100.0% | Sold out |
| Cowen and Company, LLC | 0 | $0 | 0.00% | −29,397−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −26,900−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −22,500−100.0% | Sold out |
| Twinbeech Capital LP | 0 | $0 | 0.00% | −21,570−100.0% | Sold out |
| ExodusPoint Capital Management, LP | 0 | $0 | 0.00% | −21,147−100.0% | Sold out |
| Cubist Systematic Strategies, LLC | 0 | $0 | 0.00% | −20,228−100.0% | Sold out |
| Dynamic Technology Lab Private Ltd | 0 | $0 | 0.00% | −19,821−100.0% | Sold out |
| Quantbot Technologies LP | 0 | $0 | 0.00% | −16,200−100.0% | Sold out |
| XTX Topco Ltd | 0 | $0 | 0.00% | −14,541−100.0% | Sold out |
| Bridgefront Capital, LLC | 0 | $0 | 0.00% | −11,236−100.0% | Sold out |
| Nelson, Van Denburg & Campbell Wealth Management Group, LLC | 0 | $0 | 0.00% | −11,247−100.0% | Sold out |
| Tudor Investment Corp Et Al | 0 | $0 | 0.00% | −10,449−100.0% | Sold out |
| Point72 Hong Kong Ltd | 0 | $0 | 0.00% | −8,853−100.0% | Sold out |
| Dark Forest Capital Management LP | 0 | $0 | 0.00% | −607−100.0% | Sold out |
| Panagora Asset Management Inc | 0 | $0 | 0.00% | −231−100.0% | Sold out |
| Pictet Asset Management Ltd | – | – | – | – | Not filed |