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 |
|---|---|---|---|---|---|
| Legal & General Group Plc | 36,450 | $149.8K | 0.00% | +1,261+3.6% | Added |
| Manufacturers Life Insurance Company, The | 35,597 | $146.3K | 0.00% | 00.0% | Unchanged |
| AQR Capital Management LLC | 33,902 | $139.3K | 0.00% | −101,299−74.9% | Reduced |
| Invesco Ltd. | 32,811 | $134.9K | 0.00% | −462−1.4% | Reduced |
| Algert Global LLC | 31,346 | $128.8K | 0.01% | −27,312−46.6% | Reduced |
| Janus Henderson Group PLC | 30,656 | $126.1K | 0.00% | +19,315+170.3% | Added |
| Corton Capital Inc. | 30,063 | $123.6K | 0.09% | −5,893−16.4% | Reduced |
| SEI Investments Co | 28,977 | $119.1K | 0.00% | +28,977 | New |
| E Fund Management Co., Ltd. | 27,578 | $113.0K | 0.01% | +5,734+26.2% | Added |
| State Board of Administration of Florida Retirement System | 27,402 | $112.6K | 0.00% | 00.0% | Unchanged |
| Principal Financial Group Inc | 25,462 | $104.6K | 0.00% | +3,595+16.4% | Added |
| Man Group plc | – | $102.8K | 0.00% | – | – |
| Bayesian Capital Management, LP | 24,800 | $101.9K | 0.01% | +24,800 | New |
| Teacher Retirement System of Texas | 24,589 | $101.0K | 0.00% | +977+4.1% | Added |
| Delphia (USA) Inc. | 24,365 | $100.1K | 0.12% | −8,672−26.2% | Reduced |
| Prio Wealth Limited Partnership | 23,529 | $96.7K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 23,450 | $96.0K | 0.00% | −13,248−36.1% | Reduced |
| Arizona State Retirement System | 23,128 | $95.1K | 0.00% | +1,193+5.4% | Added |
| Jasper Ridge Partners, L.P. | 23,100 | $94.9K | 0.00% | 00.0% | Unchanged |
| Walleye Trading LLC | 21,415 | $88.0K | 0.00% | +21,415 | New |
| Aquatic Capital Management LLC | 21,500 | $88.0K | 0.01% | +21,500 | New |
| Bank of Montreal | 20,501 | $85.6K | 0.00% | +3,797+22.7% | Added |
| Dynamic Technology Lab Private Ltd | 18,437 | $76.0K | 0.01% | −6,096−24.8% | Reduced |
| Russell Investments Group, Ltd. | 18,397 | $75.6K | 0.00% | −5,012−21.4% | Reduced |
| ProShare Advisors LLC | 18,382 | $75.5K | 0.00% | −1,779−8.8% | Reduced |
| BIT Capital GmbH | 16,931 | $69.6K | 0.01% | +16,931 | New |
| Point72 Middle East FZE | 15,976 | $65.7K | 0.00% | +6,410+67.0% | Added |
| Nebula Research & Development LLC | 15,702 | $64.5K | 0.11% | +15,702 | New |
| Grimes & Company, Inc. | 15,606 | $64.1K | 0.00% | +339+2.2% | Added |
| Virtus ETF Advisers LLC | 14,172 | $58.2K | 0.03% | −5,446−27.8% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 12,247 | $50.3K | 0.00% | 00.0% | Unchanged |
| Squarepoint Ops LLC | 12,236 | $50.3K | 0.00% | −85,320−87.5% | Reduced |
| Martingale Asset Management L P | 12,110 | $49.8K | 0.00% | 00.0% | Unchanged |
| Pictet Asset Management SA | 11,490 | $47.2K | 0.00% | 00.0% | Unchanged |
| Lazard Asset Management LLC | 10,821 | $44.0K | 0.00% | +10,821 | New |
| Sphera Funds Management Ltd. | 10,621 | $43.7K | 0.01% | +10,621 | New |
| Empirical Asset Management, LLC | 10,000 | $41.1K | 0.04% | 00.0% | Unchanged |
| Wolverine Trading, LLC | 10,259 | $41.0K | 0.00% | +10,259 | New |
| Amalgamated Bank | 9,391 | $39.0K | 0.00% | −2,425−20.5% | Reduced |
| Ameritas Investment Partners, Inc. | 7,067 | $29.0K | 0.00% | 00.0% | Unchanged |
| Royal Bank of Canada | 5,224 | $21.0K | 0.00% | −7,941−60.3% | Reduced |
| Metropolitan Life Insurance Co | 3,884 | $16.0K | 0.00% | −2,624−40.3% | Reduced |
| Advisor Group Holdings, Inc. | 3,235 | $13.3K | 0.00% | 00.0% | Unchanged |
| STRS Ohio | 2,500 | $10.0K | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 2,099 | $8.63K | 0.00% | +2,099 | New |
| Allspring Global Investments Holdings, LLC | 1,830 | $7.52K | 0.00% | +1,676+1,088.3% | Added |
| China Universal Asset Management Co., Ltd. | 1,463 | $6.01K | 0.00% | +449+44.3% | Added |
| Public Employees Retirement System of Ohio | 1,175 | $5.00K | 0.00% | −17,000−93.5% | Reduced |
| TCI Wealth Advisors, Inc. | 986 | $4.05K | 0.00% | +986 | New |
| Cutler Group LP | 1,200 | $4.00K | 0.00% | 00.0% | Unchanged |
| Nisa Investment Advisors, LLC | 610 | $3.00K | 0.00% | 00.0% | Unchanged |
| GWM Advisors LLC | 500 | $2.06K | 0.00% | 00.0% | Unchanged |
| Daiwa Securities Group Inc. | 401 | $2.00K | 0.00% | 00.0% | Unchanged |
| North Star Investment Management Corp. | 150 | $616 | 0.00% | 00.0% | Unchanged |
| Quadrant Capital Group LLC | 116 | $477 | 0.00% | +116 | New |
| Parallel Advisors, LLC | 78 | $321 | 0.00% | 00.0% | Unchanged |
| Ellevest, Inc. | 57 | $234 | 0.00% | 00.0% | Unchanged |
| Capital Advisors, Ltd. LLC | 71 | $0 | 0.00% | 00.0% | Unchanged |
| Woodline Partners LP | 0 | $0 | 0.00% | −523,408−100.0% | Sold out |
| LMR Partners LLP | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Opaleye Management Inc. | 0 | $0 | 0.00% | −460,000−100.0% | Sold out |
| Fred Alger Management, LLC | 0 | $0 | 0.00% | −378,450−100.0% | Sold out |
| AXA S.A. | 0 | $0 | 0.00% | −104,100−100.0% | Sold out |
| Voloridge Investment Management, LLC | 0 | $0 | 0.00% | −75,216−100.0% | Sold out |
| Jump Financial, LLC | 0 | $0 | 0.00% | −64,613−100.0% | Sold out |
| Harvest Investment Services, LLC | 0 | $0 | 0.00% | −59,563−100.0% | Sold out |
| Oversea-Chinese Banking CORP Ltd | 0 | $0 | 0.00% | −42,500−100.0% | Sold out |
| Ameriprise Financial Inc | 0 | $0 | 0.00% | −27,044−100.0% | Sold out |
| Fox Run Management, L.L.C. | 0 | $0 | 0.00% | −24,652−100.0% | Sold out |
| Boulder Hill Capital Management LP | 0 | $0 | 0.00% | −23,000−100.0% | Sold out |
| Raymond James & Associates | 0 | $0 | 0.00% | −19,431−100.0% | Sold out |
| Two Sigma Securities, LLC | 0 | $0 | 0.00% | −15,226−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −11,210−100.0% | Sold out |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −6,597−100.0% | Sold out |
| Dorsey Wright & Associates | 0 | $0 | 0.00% | −2,988−100.0% | Sold out |
| Lindbrook Capital, LLC | 0 | $0 | 0.00% | −445−100.0% | Sold out |
| Steward Partners Investment Advisory, LLC | 0 | $0 | 0.00% | −225−100.0% | Sold out |
| Alpha Paradigm Partners, LLC | – | – | – | – | Not filed |