Mersana Therapeutics Inc.
13F holders, Q1 2025 (March 31)111holders −21
28new positions
50sold out
2famous investors
$0.34avg. 13F price*
At the end of Q1 2025, 111 institutions reported holding Mersana Therapeutics Inc. in their 13F filings, down 21 from Q4 2024. 28 opened new positions and 50 sold out. The largest holders were Nextech Invest Ltd. ($4.2M), Bain Capital Life Sciences Investors, LLC ($3.0M) and Vanguard Group Inc. ($2.9M). 2 famous investors held it, including Cliff Asness (0.0% of AQR Capital Management's portfolio) and Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio).
- Company
- Mersana Therapeutics Inc.
- CUSIP
- 59045L106
- Latest filing quarter
- Q4 2025
History
Number of 13F holders
Total Exit/New Position Q4 2024 → Q1 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 28 | $4.7M |
| Exits | 50 | $39.5M |
All 13F filers, Q4 2024 → Q1 2025: 23,838,621 shares bought and 40,906,130 shares sold, net −17,067,509 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 111 holders
| Nextech Invest Ltd. | 0.97% | — | 12,067,246 | $4.2M |
| Bain Capital Life Sciences Investors, LLC | 0.44% | No change | 8,663,673 | $3.0M |
| Vanguard Group Inc. | 0.00% | Add +18.7% | 8,377,767 | $2.9M |
| BlackRock, Inc. | 0.00% | Reduce -9.6% | 8,326,182 | $2.9M |
| Schonfeld Strategic Advisors LLC | 0.02% | Add +259.2% | 7,614,064 | $2.6M |
| AQR Capital Management | 0.00% | New | 5,143,749 | $1.8M |
| Rock Springs Capital Management LP | 0.08% | Add +11.2% | 3,814,684 | $1.3M |
| Venrock Adviser, LLC | 0.10% | Reduce -65.2% | 3,574,325 | $1.2M |
| Silverarc Capital Management, LLC | 0.22% | New | 3,088,505 | $1.1M |
| Acadian Asset Management LLC | 0.00% | New | 2,989,659 | $1.0M |
| State Street Corp. | 0.00% | Reduce -5.8% | 2,603,868 | $896K |
| Geode Capital Management, LLC | 0.00% | Add +0.0% | 2,442,328 | $841K |
| Catalio Capital Management, LP | 0.15% | No change | 1,705,036 | $587K |
| 683 Capital Management, LLC | 0.06% | Add +83.3% | 1,650,000 | $568K |
| Jacobs Levy Equity Management, Inc. | 0.00% | Add +19.9% | 1,333,124 | $459K |
| 5AM Venture Management, LLC | 0.17% | No change | 1,305,000 | $449K |
| Qube Research & Technologies Ltd | 0.00% | Add +238.1% | 1,174,597 | $404K |
| Northern Trust Corp. | 0.00% | Reduce -7.0% | 864,787 | $298K |
| Renaissance Technologies | 0.00% | Add +38.5% | 839,919 | $289K |
| Deutsche Bank AG | 0.00% | No change | 839,724 | $286K |
| Ieq Capital, LLC | 0.00% | New | 707,021 | $243K |
| Lion Point Capital, LP | 1.41% | New | 644,000 | $222K |
| Alamea Verwaltungs GmbH | 0.18% | — | 604,213 | $208K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -26.9% | 586,658 | $202K |
| Woodline Partners LP | 0.00% | No change | 435,593 | $150K |
| Panagora Asset Management Inc. | 0.00% | Add +54.6% | 370,448 | $128K |
| Bank of New York Mellon Corp | 0.00% | Reduce 0.0% | 346,188 | $119K |
| UBS Group AG | 0.00% | Add +97.1% | 319,805 | $110K |
| Bank of America Corp. | 0.00% | Reduce -67.0% | 314,371 | $108K |
| Morgan Stanley | 0.00% | Reduce -74.5% | 307,130 | $106K |
| State of Wyoming | 0.01% | New | 295,498 | $102K |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -10.2% | 280,631 | $97K |
| Two Sigma Advisers, LP | 0.00% | Reduce -42.4% | 258,200 | $89K |
| Cerity Partners LLC | 0.00% | New | 244,235 | $84K |
| Susquehanna International Group, LLP | 0.00% | Add +383.6% | 241,073 | $83K |
| Nuveen, LLC | 0.00% | — | 232,223 | $80K |
| BNP Paribas Financial Markets | 0.00% | Reduce -44.2% | 201,448 | $69K |
| Alliancebernstein L.P. | 0.00% | No change | 186,060 | $64K |
| Cwm, LLC | 0.00% | Add +102580.6% | 184,825 | $64K |
| FMR LLC | 0.00% | Reduce -42.8% | 171,080 | $59K |
| Rhumbline Advisers | 0.00% | Reduce -10.3% | 154,163 | $53K |
| Macquarie Group Ltd. | 0.00% | No change | 150,000 | $52K |
| Algert Global LLC | 0.00% | Add +124.7% | 135,013 | $46K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | New | 130,700 | $45K |
| Barclays PLC | 0.00% | Reduce -33.4% | 121,725 | $42K |
| Invesco Ltd. | 0.00% | Add +109.3% | 114,863 | $40K |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) | 0.00% | Reduce -76.2% | 97,731 | $34K |
| Pallas Capital Advisors LLC | 0.00% | New | 94,531 | $33K |
| Intech Investment Management LLC | 0.00% | Add +77.1% | 90,358 | $31K |
| Citigroup Inc. | 0.00% | Reduce -16.6% | 81,625 | $28K |
| Wells Fargo & Company | 0.00% | Add +16.3% | 78,488 | $27K |
| Sei Investments Co. | 0.00% | No change | 69,527 | $24K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +4.3% | 68,760 | $24K |
| T. Rowe Price Associates Inc. | 0.00% | No change | 62,093 | $22K |
| QVT Financial LP | 0.00% | No change | 62,657 | $22K |
| Prudential Financial Inc. | 0.00% | New | 61,535 | $21K |
| Two Sigma Investments, LP | 0.00% | Reduce -74.6% | 53,652 | $18K |
| Corebridge Financial, Inc. | 0.00% | Reduce -6.9% | 52,526 | $18K |
| JPMorgan Chase & Co. | 0.00% | Reduce -98.0% | 50,704 | $17K |
| HRT Financial LP | 0.00% | New | 46,497 | $16K |
| Vanguard Personalized Indexing Management, LLC | 0.00% | New | 42,638 | $15K |
| Merit Financial Group, LLC | 0.00% | New | 41,904 | $14K |
| New York State Common Retirement Fund | 0.00% | No change | 37,235 | $13K |
| SG Americas Securities, LLC | 0.00% | Reduce -68.4% | 35,527 | $12K |
| Walleye Trading LLC | 0.00% | No change | 31,526 | $11K |
| Captrust Financial Advisors | 0.00% | New | 31,134 | $11K |
| Focus Partners Wealth | 0.00% | New | 30,529 | $11K |
| State Board of Administration of Florida Retirement System | 0.00% | No change | 28,800 | $10K |
| ProShare Advisors LLC | 0.00% | Reduce -23.9% | 28,784 | $10K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +192.1% | 26,165 | $9K |
| China Universal Asset Management Co., Ltd. | 0.00% | Reduce -5.4% | 24,779 | $9K |
| Mercer Global Advisors Inc. | 0.00% | New | 24,077 | $8K |
| Cibc World Markets Corp. | 0.00% | Add +124.1% | 23,791 | $8K |
| Jasper Ridge Partners, L.P. | 0.00% | No change | 23,100 | $8K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | No change | 22,593 | $8K |
| Mariner, LLC | 0.00% | New | 20,750 | $7K |
| Group One Trading LLC | 0.00% | Reduce -61.6% | 20,100 | $7K |
| Focus Partners Advisor Solutions, LLC | 0.00% | New | 19,485 | $7K |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -60.5% | 17,374 | $6K |
| NorthCrest Asset Manangement, LLC | 0.00% | New | 16,069 | $6K |
| Parcion Private Wealth LLC | 0.00% | New | 15,292 | $5K |
| GRIMES & Co WEALTH MANAGEMENT, LLC | 0.00% | Reduce -6.2% | 14,069 | $5K |
| Abel Hall, LLC | 0.00% | New | 13,662 | $5K |
| HSBC Holdings PLC | 0.00% | Reduce -6.1% | 12,494 | $4K |
| Legal & General Group Plc | 0.00% | No change | 11,097 | $4K |
| Principal Financial Group Inc. | 0.00% | New | 10,354 | $4K |
| Victory Capital Management Inc. | 0.00% | Reduce -3.4% | 10,339 | $4K |
| Voya Investment Management LLC | 0.00% | Reduce -72.0% | 10,123 | $3K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 9,896 | $3K |
| Hunter Perkins Capital Management, LLC | 0.00% | No change | 10,000 | $3K |
| STRS Ohio | 0.00% | No change | 8,700 | $3K |
| California State Teachers Retirement System | 0.00% | No change | 8,220 | $3K |
| Mirae Asset Global Investments Co., Ltd. | 0.00% | Add +0.4% | 4,134 | $2K |
| PNC Financial Services Group, Inc. | 0.00% | Add +1668.5% | 3,537 | $1K |
| Osaic Holdings, Inc. | 0.00% | Reduce -2.9% | 3,334 | $1K |
| Amalgamated Bank | 0.00% | No change | 3,769 | $1K |
| Simplex Trading, LLC | 0.00% | New | 3,424 | $1K |
| EverSource Wealth Advisors, LLC | 0.00% | New | 2,698 | $929 |
| GF Fund Management Co. LTD. | 0.00% | No change | 2,594 | $893 |
| Optiver Holding B.V. | 0.00% | Add +227.9% | 2,312 | $796 |
| SBI Securities Co., Ltd. | 0.00% | Add +527.5% | 1,368 | $471 |
| Nisa Investment Advisors, LLC | 0.00% | Reduce -64.1% | 1,300 | $447 |
| Coldstream Capital Management Inc. | 0.00% | New | 1,095 | $377 |
| Sterling Capital Management LLC | 0.00% | Reduce -50.3% | 944 | $325 |
| Huntington National Bank | 0.00% | New | 800 | $275 |
| True Wealth Design, LLC | 0.00% | New | 289 | $100 |
| North Star Investment Management Corp. | 0.00% | No change | 150 | $52 |
| Frazier Financial Advisors, LLC | 0.00% | No change | 5 | $2 |
| Royal Bank of Canada | 0.00% | Reduce -82.0% | 1,618 | $0 |
| Caitong International Asset Management Co., Ltd | 0.00% | New | 1 | $0 |
| Farther Finance Advisors, LLC | 0.00% | No change | 1 | $0 |
"% of holder's portfolio" is MERSANA THERAPEUTICS INC's weight in each manager's 13F, not the share of Mersana Therapeutics Inc. the manager owns.