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 2025
Institutional positions in Mersana Therapeutics, Inc. as of Mar 31, 2025. 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
- 111
- −19 vs. Q4 2024
- Shares held
- 87.8M
- −4.16M (−4.5%) vs. Q4 2024
- Total value
- $30.2M
- −$101.3M (−77.0%) vs. Q4 2024
- New holders
- 31
- 23 more added
- Sold out
- 50
- 32 more reduced
2 institutions that held it in Q4 2024 haven't filed for Q1 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2024: 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 2025
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q4 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Royal Bank of Canada | 1,618 | $0 | 0.00% | −7,374−82.0% | Reduced |
| Farther Finance Advisors, LLC | 1 | $0 | 0.00% | 00.0% | Unchanged |
| Caitong International Asset Management Co., Ltd | 1 | $0 | 0.00% | +1 | New |
| Frazier Financial Advisors, LLC | 5 | $2 | 0.00% | 00.0% | Unchanged |
| North Star Investment Management Corp. | 150 | $52 | 0.00% | 00.0% | Unchanged |
| True Wealth Design, LLC | 289 | $100 | 0.00% | +289 | New |
| Huntington National Bank | 800 | $275 | 0.00% | +800 | New |
| Sterling Capital Management LLC | 944 | $325 | 0.00% | −956−50.3% | Reduced |
| Coldstream Capital Management Inc | 1,095 | $377 | 0.00% | +1,095 | New |
| Nisa Investment Advisors, LLC | 1,300 | $447 | 0.00% | −2,322−64.1% | Reduced |
| SBI Securities Co., Ltd. | 1,368 | $471 | 0.00% | +1,150+527.5% | Added |
| Optiver Holding B.V. | 2,312 | $796 | 0.00% | +1,607+227.9% | Added |
| GF Fund Management Co. Ltd. | 2,594 | $893 | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 2,698 | $929 | 0.00% | +2,698 | New |
| Amalgamated Bank | 3,769 | $1.00K | 0.00% | 00.0% | Unchanged |
| Simplex Trading, LLC | 3,424 | $1.00K | 0.00% | +3,424 | New |
| Advisor Group Holdings, Inc. | 3,334 | $1.13K | 0.00% | −98−2.9% | Reduced |
| The PNC Financial Services Group, Inc. | 3,537 | $1.22K | 0.00% | +3,337+1,668.5% | Added |
| Mirae Asset Global Investments Co., Ltd. | 4,134 | $1.57K | 0.00% | +17+0.4% | Added |
| California State Teachers Retirement System | 8,220 | $2.83K | 0.00% | 00.0% | Unchanged |
| STRS Ohio | 8,700 | $3.00K | 0.00% | 00.0% | Unchanged |
| Hunter Perkins Capital Management, LLC | 10,000 | $3.00K | 0.00% | 00.0% | Unchanged |
| Ameritas Investment Partners, Inc. | 9,896 | $3.41K | 0.00% | 00.0% | Unchanged |
| Voya Investment Management LLC | 10,123 | $3.48K | 0.00% | −26,067−72.0% | Reduced |
| Victory Capital Management Inc | 10,339 | $3.56K | 0.00% | −368−3.4% | Reduced |
| Principal Financial Group Inc | 10,354 | $3.56K | 0.00% | +10,354 | New |
| Legal & General Group Plc | 11,097 | $3.82K | 0.00% | 00.0% | Unchanged |
| HSBC Holdings PLC | 12,494 | $4.38K | 0.00% | −807−6.1% | Reduced |
| Abel Hall, LLC | 13,662 | $4.70K | 0.00% | +13,662 | New |
| Grimes & Company, Inc. | 14,069 | $4.84K | 0.00% | −929−6.2% | Reduced |
| Parcion Private Wealth LLC | 15,292 | $5.26K | 0.00% | +15,292 | New |
| NorthCrest Asset Manangement, LLC | 16,069 | $5.53K | 0.00% | +16,069 | New |
| Manufacturers Life Insurance Company, The | 17,374 | $5.98K | 0.00% | −26,616−60.5% | Reduced |
| Buckingham Strategic Partners | 19,485 | $6.71K | 0.00% | +19,485 | New |
| Group One Trading, L.P. | 20,100 | $6.92K | 0.00% | −32,183−61.6% | Reduced |
| Mariner, LLC | 20,750 | $7.14K | 0.00% | +20,750 | New |
| Police & Firemen's Retirement System of New Jersey | 22,593 | $7.78K | 0.00% | 00.0% | Unchanged |
| Jasper Ridge Partners, L.P. | 23,100 | $7.95K | 0.00% | 00.0% | Unchanged |
| CIBC World Markets Corp | 23,791 | $8.19K | 0.00% | +13,175+124.1% | Added |
| Mercer Global Advisors Inc | 24,077 | $8.29K | 0.00% | +24,077 | New |
| China Universal Asset Management Co., Ltd. | 24,779 | $8.53K | 0.00% | −1,415−5.4% | Reduced |
| Tower Research Capital LLC (TRC) | 26,165 | $9.01K | 0.00% | +17,206+192.1% | Added |
| ProShare Advisors LLC | 28,784 | $9.91K | 0.00% | −9,015−23.8% | Reduced |
| State Board of Administration of Florida Retirement System | 28,800 | $9.91K | 0.00% | 00.0% | Unchanged |
| Colony Group, LLC | 30,529 | $10.5K | 0.00% | +30,529 | New |
| Captrust Financial Advisors | 31,134 | $10.7K | 0.00% | +31,134 | New |
| Walleye Trading LLC | 31,526 | $10.9K | 0.00% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 35,527 | $12.0K | 0.00% | −76,764−68.4% | Reduced |
| New York State Common Retirement Fund | 37,235 | $12.8K | 0.00% | 00.0% | Unchanged |
| Merit Financial Group, LLC | 41,904 | $14.4K | 0.00% | +41,904 | New |
| JustInvest LLC | 42,638 | $14.7K | 0.00% | +42,638 | New |
| HRT Financial LP | 46,497 | $16.0K | 0.00% | +46,497 | New |
| JPMorgan Chase & Co | 50,704 | $17.5K | 0.00% | −2,483,743−98.0% | Reduced |
| Corebridge Financial, Inc. | 52,526 | $18.1K | 0.00% | −3,872−6.9% | Reduced |
| Two Sigma Investments, LP | 53,652 | $18.5K | 0.00% | −157,224−74.6% | Reduced |
| Prudential Financial Inc | 61,535 | $21.2K | 0.00% | +61,535 | New |
| QVT Financial LP | 62,657 | $21.6K | 0.00% | 00.0% | Unchanged |
| Price T Rowe Associates Inc | 62,093 | $22.0K | 0.00% | 00.0% | Unchanged |
| Mirae Asset Global ETFs Holdings Ltd. | 68,760 | $23.7K | 0.00% | +2,824+4.3% | Added |
| SEI Investments Co | 69,527 | $23.9K | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 78,488 | $27.0K | 0.00% | +11,005+16.3% | Added |
| Citigroup Inc | 81,625 | $28.1K | 0.00% | −16,206−16.6% | Reduced |
| Intech Investment Management LLC | 90,358 | $31.1K | 0.00% | +39,330+77.1% | Added |
| Pallas Capital Advisors LLC | 94,531 | $32.5K | 0.00% | +94,531 | New |
| UBS Oconnor LLC | 97,731 | $33.6K | 0.00% | −312,298−76.2% | Reduced |
| Invesco Ltd. | 114,863 | $39.5K | 0.00% | +59,991+109.3% | Added |
| Barclays PLC | 121,725 | $41.9K | 0.00% | −60,986−33.4% | Reduced |
| Wealth Enhancement Advisory Services, LLC | 130,700 | $45.0K | 0.00% | +130,700 | New |
| Algert Global LLC | 135,013 | $46.5K | 0.00% | +74,930+124.7% | Added |
| Macquarie Group Ltd | 150,000 | $52.0K | 0.00% | 00.0% | Unchanged |
| Rhumbline Advisers | 154,163 | $53.0K | 0.00% | −17,694−10.3% | Reduced |
| FMR LLC | 171,080 | $58.9K | 0.00% | −128,244−42.8% | Reduced |
| CWM, LLC | 184,825 | $64.0K | 0.00% | +184,645+102,580.6% | Added |
| Alliancebernstein L.P. | 186,060 | $64.0K | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 201,448 | $69.3K | 0.00% | −159,699−44.2% | Reduced |
| Nuveen, LLC | 232,223 | $79.9K | 0.00% | +232,223 | New |
| Susquehanna International Group, LLP | 241,073 | $83.0K | 0.00% | +191,220+383.6% | Added |
| Cerity Partners LLC | 244,235 | $84.1K | 0.00% | +244,235 | New |
| Two Sigma Advisers, LP | 258,200 | $88.9K | 0.00% | −189,800−42.4% | Reduced |
| Charles Schwab Investment Management Inc | 280,631 | $96.6K | 0.00% | −31,992−10.2% | Reduced |
| State of Wyoming | 295,498 | $101.7K | 0.01% | +295,498 | New |
| Morgan Stanley | 307,130 | $105.7K | 0.00% | −896,226−74.5% | Reduced |
| Bank of America Corp | 314,371 | $108.1K | 0.00% | −639,581−67.0% | Reduced |
| UBS Group AG | 319,805 | $110.0K | 0.00% | +157,541+97.1% | Added |
| Bank of New York Mellon Corp | 346,188 | $119.2K | 0.00% | −10.0% | Reduced |
| Panagora Asset Management Inc | 370,448 | $127.5K | 0.00% | +130,763+54.6% | Added |
| Woodline Partners LP | 435,593 | $149.9K | 0.00% | 00.0% | Unchanged |
| Goldman Sachs Group Inc | 586,658 | $201.9K | 0.00% | −215,708−26.9% | Reduced |
| Alamea Verwaltungs GmbH | 604,213 | $207.8K | 0.18% | +604,213 | New |
| Lion Point Capital, LP | 644,000 | $221.7K | 1.41% | +644,000 | New |
| Ieq Capital, LLC | 707,021 | $243.4K | 0.00% | +707,021 | New |
| Deutsche Bank AG | 839,724 | $285.5K | 0.00% | 00.0% | Unchanged |
| Renaissance Technologies LLC | 839,919 | $289.1K | 0.00% | +233,634+38.5% | Added |
| Northern Trust Corp | 864,787 | $297.7K | 0.00% | −64,921−7.0% | Reduced |
| Qube Research & Technologies Ltd | 1,174,597 | $404.3K | 0.00% | +827,182+238.1% | Added |
| 5AM Venture Management, LLC | 1,305,000 | $449.2K | 0.17% | 00.0% | Unchanged |
| Jacobs Levy Equity Management, Inc | 1,333,124 | $458.9K | 0.00% | +221,126+19.9% | Added |
| 683 Capital Management, LLC | 1,650,000 | $567.9K | 0.06% | +750,000+83.3% | Added |
| Catalio Capital Management, LP | 1,705,036 | $586.9K | 0.15% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 2,442,328 | $840.8K | 0.00% | +780.0% | Added |