Mersana Therapeutics Inc.
13F holders, Q2 2025 (June 30)83holders −28
12new positions
41sold out
3famous investors
$0.30avg. 13F price*
At the end of Q2 2025, 83 institutions reported holding Mersana Therapeutics Inc. in their 13F filings, down 28 from Q1 2025. 12 opened new positions and 41 sold out. The largest holders were Nextech Invest Ltd. ($3.6M), Bain Capital Life Sciences Investors, LLC ($2.6M) and Vanguard Group Inc. ($2.3M). 3 famous investors held it, including Cliff Asness (0.0% of AQR Capital Management's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Mersana Therapeutics Inc.
- CUSIP
- 59045L106
- Latest filing quarter
- Q4 2025
History
Number of 13F holders
Total Exit/New Position Q1 2025 → Q2 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 12 | $1.3M |
| Exits | 41 | $2.2M |
All 13F filers, Q1 2025 → Q2 2025: 10,098,161 shares bought and 20,752,690 shares sold, net −10,654,529 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 83 holders
| Nextech Invest Ltd. | 0.68% | No change | 12,067,246 | $3.6M |
| Bain Capital Life Sciences Investors, LLC | 0.32% | No change | 8,663,673 | $2.6M |
| Vanguard Group Inc. | 0.00% | Reduce -8.3% | 7,678,391 | $2.3M |
| Schonfeld Strategic Advisors LLC | 0.01% | Reduce -25.5% | 5,673,852 | $1.7M |
| AQR Capital Management | 0.00% | Reduce -0.3% | 5,129,685 | $1.5M |
| Rock Springs Capital Management LP | 0.07% | No change | 3,814,684 | $1.1M |
| BlackRock, Inc. | 0.00% | Reduce -54.8% | 3,763,419 | $1.1M |
| Silverarc Capital Management, LLC | 0.19% | Add +1.3% | 3,128,421 | $926K |
| Acadian Asset Management LLC | 0.00% | Reduce -1.1% | 2,955,280 | $873K |
| Renaissance Technologies | 0.00% | Add +239.3% | 2,850,194 | $844K |
| Millennium Management | 0.00% | New | 2,090,235 | $619K |
| 683 Capital Management, LLC | 0.06% | Add +20.6% | 1,990,000 | $589K |
| Catalio Capital Management, LP | 0.10% | Reduce -8.1% | 1,567,413 | $464K |
| Goldman Sachs Group Inc. | 0.00% | Add +144.4% | 1,433,760 | $424K |
| Jacobs Levy Equity Management, Inc. | 0.00% | Reduce -0.0% | 1,332,945 | $395K |
| 5AM Venture Management, LLC | 0.15% | No change | 1,305,000 | $386K |
| Geode Capital Management, LLC | 0.00% | Reduce -57.0% | 1,049,205 | $311K |
| Luminus Management LLC | 0.08% | New | 1,039,314 | $308K |
| Two Sigma Advisers, LP | 0.00% | Add +262.9% | 937,000 | $277K |
| Two Sigma Investments, LP | 0.00% | Add +1434.5% | 823,269 | $244K |
| UBS Group AG | 0.00% | Add +142.5% | 775,501 | $230K |
| Lion Point Capital, LP | 1.29% | No change | 644,000 | $191K |
| Ieq Capital, LLC | 0.00% | Reduce -9.7% | 638,452 | $189K |
| Alamea Verwaltungs GmbH | 0.13% | No change | 604,213 | $179K |
| Jane Street Group, LLC | 0.00% | New | 511,182 | $151K |
| Gsa Capital Partners LLP | 0.01% | New | 471,681 | $140K |
| State Street Corp. | 0.00% | Reduce -82.6% | 452,110 | $134K |
| Susquehanna International Group, LLP | 0.00% | Add +86.4% | 449,369 | $133K |
| Morgan Stanley | 0.00% | Add +16.4% | 357,597 | $106K |
| Cerity Partners LLC | 0.00% | Add +31.4% | 320,805 | $95K |
| Deutsche Bank AG | 0.00% | Reduce -63.7% | 305,070 | $92K |
| Northern Trust Corp. | 0.00% | Reduce -74.3% | 222,694 | $66K |
| Cwm, LLC | 0.00% | Reduce -10.5% | 165,404 | $49K |
| Qube Research & Technologies Ltd | 0.00% | Reduce -87.0% | 152,877 | $45K |
| Macquarie Group Ltd. | 0.00% | No change | 150,000 | $44K |
| FMR LLC | 0.00% | Reduce -19.0% | 138,520 | $41K |
| JPMorgan Chase & Co. | 0.00% | Add +156.6% | 130,094 | $39K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | Reduce -3.0% | 126,729 | $37K |
| Algert Global LLC | 0.00% | Reduce -25.0% | 101,313 | $30K |
| Pallas Capital Advisors LLC | 0.00% | Add +2.3% | 96,709 | $29K |
| Jain Global LLC | 0.00% | New | 96,154 | $28K |
| HRT Financial LP | 0.00% | Add +100.8% | 93,373 | $27K |
| Point72 Asia (Singapore) Pte. Ltd. | 0.00% | New | 75,151 | $22K |
| Citigroup Inc. | 0.00% | Reduce -10.6% | 72,997 | $22K |
| Bank of New York Mellon Corp | 0.00% | Reduce -80.8% | 66,577 | $20K |
| QVT Financial LP | 0.00% | No change | 62,657 | $19K |
| Callan Family Office, LLC | 0.00% | New | 56,559 | $17K |
| R Squared Ltd | 0.01% | New | 47,229 | $14K |
| Captrust Financial Advisors | 0.00% | Add +34.1% | 41,746 | $12K |
| Vanguard Personalized Indexing Management, LLC | 0.00% | Reduce -13.9% | 36,692 | $11K |
| Group One Trading LLC | 0.00% | Add +73.4% | 34,856 | $10K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +21.1% | 31,684 | $9K |
| Merit Financial Group, LLC | 0.00% | Reduce -24.6% | 31,588 | $9K |
| Walleye Trading LLC | 0.00% | No change | 31,526 | $9K |
| Mariner, LLC | 0.00% | Add +50.4% | 31,213 | $9K |
| Focus Partners Wealth | 0.00% | Add +1.5% | 30,976 | $9K |
| HSBC Holdings PLC | 0.00% | Add +144.1% | 30,500 | $9K |
| China Universal Asset Management Co., Ltd. | 0.00% | Add +1.0% | 25,032 | $7K |
| Jasper Ridge Partners, L.P. | 0.00% | No change | 23,100 | $7K |
| Wells Fargo & Company | 0.00% | Reduce -70.7% | 23,014 | $7K |
| Bank of America Corp. | 0.00% | Reduce -93.6% | 20,083 | $6K |
| Two Sigma Securities, LLC | 0.00% | New | 17,566 | $5K |
| Parcion Private Wealth LLC | 0.00% | Add +6.2% | 16,233 | $5K |
| Prudential Financial Inc. | 0.00% | Reduce -75.8% | 14,900 | $4K |
| Jump Financial, LLC | 0.00% | New | 11,323 | $3K |
| Hunter Perkins Capital Management, LLC | 0.00% | No change | 10,000 | $3K |
| ExodusPoint Capital Management, LP | 0.00% | New | 11,434 | $3K |
| Barclays PLC | 0.00% | Reduce -92.0% | 9,767 | $3K |
| EverSource Wealth Advisors, LLC | 0.00% | Add +103.6% | 5,494 | $2K |
| Essential Partners LLC | 0.00% | — | 5,405 | $2K |
| Mirae Asset Global Investments Co., Ltd. | 0.00% | Add +16.4% | 4,814 | $1K |
| BNP Paribas Financial Markets | 0.00% | Reduce -98.6% | 2,765 | $818 |
| GF Fund Management Co. LTD. | 0.00% | No change | 2,594 | $768 |
| Osaic Holdings, Inc. | 0.00% | Reduce -22.1% | 2,598 | $754 |
| Optiver Holding B.V. | 0.00% | No change | 2,312 | $684 |
| Nisa Investment Advisors, LLC | 0.00% | Reduce -19.2% | 1,050 | $311 |
| PNC Financial Services Group, Inc. | 0.00% | Reduce -74.8% | 893 | $264 |
| Huntington National Bank | 0.00% | No change | 800 | $237 |
| IFP Advisors, Inc | 0.00% | New | 677 | $201 |
| North Star Investment Management Corp. | 0.00% | No change | 150 | $44 |
| Royal Bank of Canada | 0.00% | Reduce -90.7% | 150 | $0 |
| Caitong International Asset Management Co., Ltd | 0.00% | No change | 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.