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 |
|---|---|---|---|---|---|
| Capital Advisors, Ltd. LLC | 71 | $0 | 0.00% | 00.0% | Unchanged |
| Ellevest, Inc. | 57 | $234 | 0.00% | 00.0% | Unchanged |
| Parallel Advisors, LLC | 78 | $321 | 0.00% | 00.0% | Unchanged |
| Quadrant Capital Group LLC | 116 | $477 | 0.00% | +116 | New |
| North Star Investment Management Corp. | 150 | $616 | 0.00% | 00.0% | Unchanged |
| Daiwa Securities Group Inc. | 401 | $2.00K | 0.00% | 00.0% | Unchanged |
| GWM Advisors LLC | 500 | $2.06K | 0.00% | 00.0% | Unchanged |
| Nisa Investment Advisors, LLC | 610 | $3.00K | 0.00% | 00.0% | Unchanged |
| Cutler Group LP | 1,200 | $4.00K | 0.00% | 00.0% | Unchanged |
| TCI Wealth Advisors, Inc. | 986 | $4.05K | 0.00% | +986 | New |
| Public Employees Retirement System of Ohio | 1,175 | $5.00K | 0.00% | −17,000−93.5% | Reduced |
| China Universal Asset Management Co., Ltd. | 1,463 | $6.01K | 0.00% | +449+44.3% | Added |
| Allspring Global Investments Holdings, LLC | 1,830 | $7.52K | 0.00% | +1,676+1,088.3% | Added |
| Group One Trading, L.P. | 2,099 | $8.63K | 0.00% | +2,099 | New |
| STRS Ohio | 2,500 | $10.0K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 3,235 | $13.3K | 0.00% | 00.0% | Unchanged |
| Metropolitan Life Insurance Co | 3,884 | $16.0K | 0.00% | −2,624−40.3% | Reduced |
| Royal Bank of Canada | 5,224 | $21.0K | 0.00% | −7,941−60.3% | Reduced |
| Ameritas Investment Partners, Inc. | 7,067 | $29.0K | 0.00% | 00.0% | Unchanged |
| Amalgamated Bank | 9,391 | $39.0K | 0.00% | −2,425−20.5% | Reduced |
| Wolverine Trading, LLC | 10,259 | $41.0K | 0.00% | +10,259 | New |
| Empirical Asset Management, LLC | 10,000 | $41.1K | 0.04% | 00.0% | Unchanged |
| Sphera Funds Management Ltd. | 10,621 | $43.7K | 0.01% | +10,621 | New |
| Lazard Asset Management LLC | 10,821 | $44.0K | 0.00% | +10,821 | New |
| Pictet Asset Management SA | 11,490 | $47.2K | 0.00% | 00.0% | Unchanged |
| Martingale Asset Management L P | 12,110 | $49.8K | 0.00% | 00.0% | Unchanged |
| Squarepoint Ops LLC | 12,236 | $50.3K | 0.00% | −85,320−87.5% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 12,247 | $50.3K | 0.00% | 00.0% | Unchanged |
| Virtus ETF Advisers LLC | 14,172 | $58.2K | 0.03% | −5,446−27.8% | Reduced |
| Grimes & Company, Inc. | 15,606 | $64.1K | 0.00% | +339+2.2% | Added |
| Nebula Research & Development LLC | 15,702 | $64.5K | 0.11% | +15,702 | New |
| Point72 Middle East FZE | 15,976 | $65.7K | 0.00% | +6,410+67.0% | Added |
| BIT Capital GmbH | 16,931 | $69.6K | 0.01% | +16,931 | New |
| ProShare Advisors LLC | 18,382 | $75.5K | 0.00% | −1,779−8.8% | Reduced |
| Russell Investments Group, Ltd. | 18,397 | $75.6K | 0.00% | −5,012−21.4% | Reduced |
| Dynamic Technology Lab Private Ltd | 18,437 | $76.0K | 0.01% | −6,096−24.8% | Reduced |
| Bank of Montreal | 20,501 | $85.6K | 0.00% | +3,797+22.7% | Added |
| Aquatic Capital Management LLC | 21,500 | $88.0K | 0.01% | +21,500 | New |
| Walleye Trading LLC | 21,415 | $88.0K | 0.00% | +21,415 | New |
| Jasper Ridge Partners, L.P. | 23,100 | $94.9K | 0.00% | 00.0% | Unchanged |
| Arizona State Retirement System | 23,128 | $95.1K | 0.00% | +1,193+5.4% | Added |
| Tower Research Capital LLC (TRC) | 23,450 | $96.0K | 0.00% | −13,248−36.1% | Reduced |
| Prio Wealth Limited Partnership | 23,529 | $96.7K | 0.00% | 00.0% | Unchanged |
| Delphia (USA) Inc. | 24,365 | $100.1K | 0.12% | −8,672−26.2% | Reduced |
| Teacher Retirement System of Texas | 24,589 | $101.0K | 0.00% | +977+4.1% | Added |
| Bayesian Capital Management, LP | 24,800 | $101.9K | 0.01% | +24,800 | New |
| Man Group plc | – | $102.8K | 0.00% | – | – |
| Principal Financial Group Inc | 25,462 | $104.6K | 0.00% | +3,595+16.4% | Added |
| State Board of Administration of Florida Retirement System | 27,402 | $112.6K | 0.00% | 00.0% | Unchanged |
| E Fund Management Co., Ltd. | 27,578 | $113.0K | 0.01% | +5,734+26.2% | Added |
| SEI Investments Co | 28,977 | $119.1K | 0.00% | +28,977 | New |
| Corton Capital Inc. | 30,063 | $123.6K | 0.09% | −5,893−16.4% | Reduced |
| Janus Henderson Group PLC | 30,656 | $126.1K | 0.00% | +19,315+170.3% | Added |
| Algert Global LLC | 31,346 | $128.8K | 0.01% | −27,312−46.6% | Reduced |
| Invesco Ltd. | 32,811 | $134.9K | 0.00% | −462−1.4% | Reduced |
| AQR Capital Management LLC | 33,902 | $139.3K | 0.00% | −101,299−74.9% | Reduced |
| Manufacturers Life Insurance Company, The | 35,597 | $146.3K | 0.00% | 00.0% | Unchanged |
| Legal & General Group Plc | 36,450 | $149.8K | 0.00% | +1,261+3.6% | Added |
| New York State Common Retirement Fund | 37,108 | $152.5K | 0.00% | −18,873−33.7% | Reduced |
| ExodusPoint Capital Management, LP | 40,034 | $165.0K | 0.00% | +28,235+239.3% | Added |
| Cornercap Investment Counsel Inc | 42,633 | $175.2K | 0.03% | 00.0% | Unchanged |
| CM Wealth Advisors LLC | 45,367 | $176.0K | 0.03% | +45,367 | New |
| American International Group, Inc. | 44,670 | $183.6K | 0.00% | +889+2.0% | Added |
| Great West Life Assurance Co | 44,554 | $184.0K | 0.00% | 00.0% | Unchanged |
| Simplex Trading, LLC | 45,542 | $187.0K | 0.01% | +42,452+1,373.9% | Added |
| XTX Topco Ltd | 45,738 | $188.0K | 0.04% | −87,166−65.6% | Reduced |
| MetLife Investment Management | 46,642 | $191.7K | 0.00% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 46,605 | $192.0K | 0.00% | −2,326−4.8% | Reduced |
| Prudential Financial Inc | 51,155 | $210.2K | 0.00% | −7,550−12.9% | Reduced |
| Skandinaviska Enskilda Banken AB (publ) | 58,469 | $240.0K | 0.00% | −2,853−4.7% | Reduced |
| Connor, Clark & Lunn Investment Management Ltd. | 59,051 | $242.7K | 0.00% | −149,382−71.7% | Reduced |
| Occudo Quantitative Strategies LP | 59,411 | $244.2K | 0.02% | −22,127−27.1% | Reduced |
| Acuta Capital Partners, LLC | 60,000 | $246.6K | 0.19% | −890,000−93.7% | Reduced |
| Thrivent Financial for Lutherans | 60,922 | $250.0K | 0.00% | 00.0% | Unchanged |
| Los Angeles Capital Management LLC | 61,790 | $254.0K | 0.00% | +10,725+21.0% | Added |
| QVT Financial LP | 62,657 | $257.5K | 0.02% | 00.0% | Unchanged |
| Mirae Asset Global Investments Co., Ltd. | 64,065 | $263.3K | 0.00% | +18,544+40.7% | Added |
| Jacobs Levy Equity Management, Inc | 65,891 | $270.8K | 0.00% | −437,254−86.9% | Reduced |
| Mackenzie Financial Corp | 68,822 | $282.9K | 0.00% | −4,870−6.6% | Reduced |
| Engineers Gate Manager LP | 69,160 | $284.2K | 0.01% | +13,158+23.5% | Added |
| Alps Advisors Inc | 71,171 | $292.5K | 0.00% | +3,435+5.1% | Added |
| State of Wisconsin Investment Board | 73,638 | $302.7K | 0.00% | +740+1.0% | Added |
| Trexquant Investment LP | 80,438 | $330.6K | 0.01% | −77,293−49.0% | Reduced |
| Healthcare of Ontario Pension Plan Trust Fund | 84,000 | $345.2K | 0.00% | 00.0% | Unchanged |
| HAP Trading, LLC | 89,563 | $368.0K | 0.09% | +89,563 | New |
| Profund Advisors LLC | 90,095 | $370.3K | 0.02% | +90,095 | New |
| Allianz Asset Management GmbH | 90,500 | $372.0K | 0.00% | +30,400+50.6% | Added |
| Wells Fargo & Company | 97,275 | $399.8K | 0.00% | +97,275 | New |
| Alliancebernstein L.P. | 99,700 | $409.8K | 0.00% | 00.0% | Unchanged |
| UBS Asset Management Americas Inc | 102,575 | $421.6K | 0.00% | 00.0% | Unchanged |
| Credit Suisse AG | 103,879 | $426.9K | 0.00% | +6,405+6.6% | Added |
| California State Teachers Retirement System | 104,531 | $429.6K | 0.00% | +58+0.1% | Added |
| Citadel Advisors LLC | 112,661 | $463.0K | 0.00% | −512,915−82.0% | Reduced |
| JPMorgan Chase & Co | 121,565 | $500.0K | 0.00% | −265,258−68.6% | Reduced |
| Price T Rowe Associates Inc | 121,377 | $500.0K | 0.00% | +858+0.7% | Added |
| FMR LLC | 123,815 | $508.9K | 0.00% | +438+0.4% | Added |
| Macquarie Group Ltd | 150,000 | $617.0K | 0.00% | 00.0% | Unchanged |
| Rhumbline Advisers | 158,341 | $651.0K | 0.00% | +5,376+3.5% | Added |
| Tekla Capital Management LLC | 162,383 | $667.4K | 0.03% | +162,383 | New |
| Swiss National Bank | 172,296 | $708.1K | 0.00% | −15,400−8.2% | Reduced |