Mersana Therapeutics Inc.
13F holders, Q3 2024 (September 30)116holders −6
11new positions
17sold out
4famous investors
$1.89avg. 13F price*
At the end of Q3 2024, 116 institutions reported holding Mersana Therapeutics Inc. in their 13F filings, down 6 from Q2 2024. 11 opened new positions and 17 sold out. The largest holders were EcoR1 Capital, LLC ($36.6M), Nextech Invest Ltd. ($22.8M) and Venrock Adviser, LLC ($21.4M). 4 famous investors held it, including Ken Griffin (0.0% of Citadel Advisors's portfolio), David E. Shaw (0.0% of D. E. Shaw & Co.'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 Q2 2024 → Q3 2024
| Institutions | Total Value | |
|---|---|---|
| New Positions | 11 | $7.9M |
| Exits | 17 | $9.7M |
All 13F filers, Q2 2024 → Q3 2024: 14,502,507 shares bought and 12,561,609 shares sold, net +1,940,898 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 116 holders
| EcoR1 Capital, LLC | 1.25% | No change | 19,364,688 | $36.6M |
| Nextech Invest Ltd. | 3.20% | Add +26.7% | 12,067,246 | $22.8M |
| Venrock Adviser, LLC | 1.12% | No change | 11,328,000 | $21.4M |
| Bain Capital Life Sciences Investors, LLC | 1.70% | No change | 8,663,673 | $16.4M |
| BlackRock, Inc. | 0.00% | — | 8,621,861 | $16.3M |
| Vanguard Group Inc. | 0.00% | Add +7.1% | 7,177,458 | $13.6M |
| Citadel Advisors | 0.01% | Add +60.8% | 4,411,555 | $8.3M |
| Rock Springs Capital Management LP | 0.19% | No change | 3,046,782 | $5.8M |
| State Street Corp. | 0.00% | Add +1.6% | 2,725,394 | $5.2M |
| Geode Capital Management, LLC | 0.00% | Reduce -3.2% | 2,413,215 | $4.6M |
| JPMorgan Chase & Co. | 0.00% | Add +18.9% | 2,351,359 | $4.4M |
| Schonfeld Strategic Advisors LLC | 0.03% | Reduce -25.3% | 2,223,308 | $4.2M |
| Goldman Sachs Group Inc. | 0.00% | Add +57.4% | 1,959,236 | $3.7M |
| Boxer Capital, LLC | 0.17% | New | 1,817,000 | $3.4M |
| Deutsche Bank AG | 0.00% | Add +1.3% | 1,596,173 | $3.0M |
| Silverarc Capital Management, LLC | 0.68% | Reduce -36.6% | 1,585,786 | $3.0M |
| Morgan Stanley | 0.00% | Reduce -40.0% | 1,364,216 | $2.6M |
| 5AM Venture Management, LLC | 0.51% | No change | 1,305,000 | $2.5M |
| Verition Fund Management LLC | 0.02% | Add +11695.2% | 1,303,249 | $2.5M |
| Acuta Capital Partners, LLC | 1.84% | Reduce -27.8% | 1,200,000 | $2.3M |
| Exome Asset Management LLC | 1.51% | New | 1,178,570 | $2.2M |
| Baker Bros. Advisors LP | 0.02% | No change | 1,086,115 | $2.1M |
| D. E. Shaw & Co. | 0.00% | Reduce -30.2% | 1,022,455 | $1.9M |
| Jacobs Levy Equity Management, Inc. | 0.01% | Add +104.5% | 993,046 | $1.9M |
| Octagon Capital Advisors LP | 0.30% | No change | 992,000 | $1.9M |
| Bank of America Corp. | 0.00% | Add +519.6% | 990,036 | $1.9M |
| Northern Trust Corp. | 0.00% | Add +3.6% | 933,491 | $1.8M |
| Qube Research & Technologies Ltd | 0.00% | Reduce -11.6% | 877,043 | $1.7M |
| Wellington Management Group LLP | 0.00% | Add +16.0% | 618,305 | $1.2M |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) | 0.03% | Add +4.7% | 570,029 | $1.1M |
| Atle Fund Management AB | 0.48% | Add +191.3% | 538,621 | $1.0M |
| Balyasny Asset Management L.P. | 0.00% | New | 535,819 | $1.0M |
| ClariVest Asset Management LLC | 0.10% | No change | 500,498 | $1.0M |
| Barclays PLC | 0.00% | Add +32.7% | 494,516 | $935K |
| Renaissance Technologies | 0.00% | Reduce -66.0% | 492,719 | $931K |
| Two Sigma Advisers, LP | 0.00% | Reduce -32.3% | 486,800 | $920K |
| UBS Group AG | 0.00% | Add +1253.6% | 473,527 | $895K |
| Woodline Partners LP | 0.01% | Reduce -70.5% | 433,552 | $819K |
| Jane Street Group, LLC | 0.00% | Add +31.6% | 417,451 | $789K |
| Bank of New York Mellon Corp | 0.00% | Reduce -17.8% | 372,173 | $703K |
| Prelude Capital Management, LLC | 0.05% | New | 364,727 | $689K |
| XTX Topco Ltd | 0.05% | Add +186.0% | 347,255 | $656K |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce 0.0% | 312,623 | $591K |
| Two Sigma Investments, LP | 0.00% | Reduce -59.9% | 300,222 | $567K |
| FMR LLC | 0.00% | Add +13.2% | 277,740 | $525K |
| Gsa Capital Partners LLP | 0.04% | Add +368.9% | 271,774 | $514K |
| Millennium Management | 0.00% | Reduce -62.5% | 259,783 | $491K |
| BNP Paribas Financial Markets | 0.00% | Reduce -29.4% | 237,198 | $448K |
| Panagora Asset Management Inc. | 0.00% | Reduce -1.3% | 233,209 | $441K |
| Los Angeles Capital Management LLC | 0.00% | Add +8.1% | 189,660 | $358K |
| Alliancebernstein L.P. | 0.00% | No change | 186,060 | $352K |
| Federated Hermes, Inc. | 0.00% | Reduce -0.9% | 183,744 | $347K |
| 683 Capital Management, LLC | 0.04% | New | 182,793 | $345K |
| Rhumbline Advisers | 0.00% | Reduce -5.2% | 166,846 | $315K |
| Nuveen Asset Management, LLC | 0.00% | Add +22.6% | 151,201 | $286K |
| Macquarie Group Ltd. | 0.00% | No change | 150,000 | $284K |
| T. Rowe Price Associates Inc. | 0.00% | No change | 99,078 | $188K |
| SG Americas Securities, LLC | 0.00% | Reduce -37.1% | 87,233 | $165K |
| Exchange Traded Concepts, LLC | 0.00% | Add +95.8% | 85,006 | $161K |
| Susquehanna Portfolio Strategies, LLC | 0.01% | Reduce -11.9% | 82,713 | $156K |
| Citigroup Inc. | 0.00% | Add +222.0% | 82,312 | $156K |
| Squarepoint Ops LLC | 0.00% | Reduce -67.7% | 81,629 | $154K |
| Susquehanna International Group, LLP | 0.00% | Reduce -31.3% | 74,809 | $141K |
| Simplex Trading, LLC | 0.00% | Add +88.4% | 72,844 | $137K |
| Algert Global LLC | 0.00% | Add +42.2% | 63,483 | $120K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +10.8% | 63,124 | $119K |
| QVT Financial LP | 0.01% | No change | 62,657 | $118K |
| Corebridge Financial, Inc. | 0.00% | Reduce -0.6% | 60,655 | $115K |
| Invesco Ltd. | 0.00% | Add +23.1% | 55,483 | $105K |
| Wells Fargo & Company | 0.00% | Add +1.8% | 48,115 | $91K |
| Ameriprise Financial Inc. | 0.00% | Add +0.2% | 45,647 | $86K |
| Manufacturers Life Insurance Company, The | 0.00% | Reduce -4.3% | 44,473 | $84K |
| Graham Capital Management, L.P. | 0.00% | Reduce -16.8% | 42,417 | $80K |
| Voya Investment Management LLC | 0.00% | Reduce -0.7% | 38,301 | $72K |
| New York State Common Retirement Fund | 0.00% | No change | 37,235 | $70K |
| MetLife Investment Management, LLC | 0.00% | Reduce -48.3% | 33,916 | $64K |
| Group One Trading LLC | 0.00% | Add +38.8% | 32,570 | $62K |
| Walleye Trading LLC | 0.00% | No change | 31,526 | $60K |
| Quarry LP | 0.02% | New | 30,000 | $57K |
| State Board of Administration of Florida Retirement System | 0.00% | No change | 28,800 | $54K |
| Intech Investment Management LLC | 0.00% | New | 27,342 | $52K |
| Atom Investors LP | 0.00% | Reduce -93.3% | 24,661 | $47K |
| Acadian Asset Management LLC | 0.00% | Reduce -65.9% | 24,394 | $46K |
| Prio Wealth Limited Partnership | 0.00% | No change | 23,529 | $44K |
| Jasper Ridge Partners, L.P. | 0.00% | No change | 23,100 | $44K |
| ProShare Advisors LLC | 0.00% | Add +44.3% | 21,435 | $41K |
| Public Employees Retirement System of Ohio | 0.00% | No change | 20,587 | $39K |
| Dynamic Technology Lab Private Ltd | 0.00% | New | 18,095 | $34K |
| US Bancorp \de | 0.00% | New | 16,178 | $31K |
| GRIMES & Co WEALTH MANAGEMENT, LLC | 0.00% | No change | 14,998 | $28K |
| HSBC Holdings PLC | 0.00% | Add +11.5% | 13,965 | $26K |
| Royal Bank of Canada | 0.00% | Add +7.4% | 11,455 | $22K |
| Victory Capital Management Inc. | 0.00% | Reduce -3.5% | 11,458 | $22K |
| Legal & General Group Plc | 0.00% | No change | 11,097 | $21K |
| Russell Investments Group, Ltd. | 0.00% | Add +13.1% | 10,765 | $20K |
| Caption Management, LLC | 0.00% | No change | 10,200 | $19K |
| Hunter Perkins Capital Management, LLC | 0.00% | No change | 10,000 | $19K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 9,896 | $19K |
| STRS Ohio | 0.00% | No change | 8,700 | $16K |
| California State Teachers Retirement System | 0.00% | No change | 8,220 | $16K |
| Smartleaf Asset Management LLC | 0.00% | Add +174.8% | 5,252 | $10K |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -89.3% | 4,363 | $8K |
| Amalgamated Bank | 0.00% | No change | 3,769 | $7K |
| Osaic Holdings, Inc. | 0.00% | Reduce -1.3% | 3,432 | $6K |
| Nisa Investment Advisors, LLC | 0.00% | Reduce -82.4% | 3,131 | $6K |
| Picton Mahoney Asset Management | 0.00% | Add +272.2% | 2,494 | $4K |
| Catalyst Funds Management Pty Ltd | 0.00% | No change | 1,700 | $3K |
| Nordwand Advisors, LLC | 0.00% | No change | 1,500 | $3K |
| Sterling Capital Management LLC | 0.00% | — | 234 | $442 |
| PNC Financial Services Group, Inc. | 0.00% | No change | 200 | $378 |
| Jones Financial Companies LLLP | 0.00% | New | 200 | $370 |
| North Star Investment Management Corp. | 0.00% | No change | 150 | $284 |
| Earned Wealth Advisors, LLC | 0.00% | New | 11 | $21 |
| Frazier Financial Advisors, LLC | 0.00% | No change | 5 | $10 |
| Farther Finance Advisors, LLC | 0.00% | No change | 1 | $2 |
| Cwm, LLC | 0.00% | Add +155.1% | 125 | $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.