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, Q4 2023
Institutional positions in Mersana Therapeutics, Inc. as of Dec 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
- 106
- −21 vs. Q3 2023
- Shares held
- 113.3M
- +459.0K (+0.4%) vs. Q3 2023
- Total value
- $263.0M
- +$119.7M (+83.6%) vs. Q3 2023
- New holders
- 19
- 33 more added
- Sold out
- 40
- 35 more reduced
1 institution that held it in Q3 2023 haven't filed for Q4 2023 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2023: 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, Q4 2023
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q3 2023.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| EcoR1 Capital, LLC | 19,364,688 | $44.9M | 1.17% | 00.0% | Unchanged |
| VR Adviser, LLC | 11,328,000 | $26.3M | 1.80% | 00.0% | Unchanged |
| Balyasny Asset Management LLC | 9,698,147 | $22.5M | 0.06% | +4,657,247+92.4% | Added |
| Bain Capital Life Sciences Investors, LLC | 8,663,673 | $20.1M | 1.93% | 00.0% | Unchanged |
| BlackRock Inc. | 7,844,282 | $18.2M | 0.00% | −128,378−1.6% | Reduced |
| Silverarc Capital Management, LLC | 6,420,136 | $14.9M | 4.59% | +1,420,136+28.4% | Added |
| Vanguard Group Inc | 6,237,588 | $14.5M | 0.00% | +51,465+0.8% | Added |
| Nextech Invest AG | 5,978,327 | $13.9M | 2.58% | +5,978,327 | New |
| Morgan Stanley | 4,134,546 | $9.59M | 0.00% | +3,148,529+319.3% | Added |
| Millennium Management LLC | 3,394,440 | $7.88M | 0.01% | +1,216,790+55.9% | Added |
| Rock Springs Capital Management LP | 3,046,782 | $7.07M | 0.17% | −356,351−10.5% | Reduced |
| Acuta Capital Partners, LLC | 2,368,000 | $5.49M | 3.09% | +2,268,393+2,277.3% | Added |
| State Street Corp | 2,329,434 | $5.40M | 0.00% | +16,692+0.7% | Added |
| Geode Capital Management, LLC | 2,297,136 | $5.33M | 0.00% | +139,471+6.5% | Added |
| Citadel Advisors LLC | 1,926,931 | $4.47M | 0.00% | +312,208+19.3% | Added |
| 5AM Venture Management, LLC | 1,305,000 | $3.03M | 0.80% | 00.0% | Unchanged |
| Philosophy Capital Management LLC | 1,264,567 | $2.93M | 0.59% | −1,078,067−46.0% | Reduced |
| Schonfeld Strategic Advisors LLC | 1,139,407 | $2.64M | 0.02% | +1,139,407 | New |
| Deutsche Bank AG | 1,139,232 | $2.64M | 0.00% | +1,076,405+1,713.3% | Added |
| Baker Bros. Advisors LP | 1,086,115 | $2.52M | 0.03% | 00.0% | Unchanged |
| Affinity Asset Advisors, LLC | 1,000,000 | $2.32M | 0.46% | −1,850,000−64.9% | Reduced |
| Northern Trust Corp | 931,406 | $2.16M | 0.00% | −99,180−9.6% | Reduced |
| Jacobs Levy Equity Management, Inc | 930,607 | $2.16M | 0.01% | +930,607 | New |
| Renaissance Technologies LLC | 865,731 | $2.01M | 0.00% | −60,188−6.5% | Reduced |
| Atom Investors LP | 774,659 | $1.80M | 0.32% | +481,482+164.2% | Added |
| D. E. Shaw & Co., Inc. | 667,383 | $1.55M | 0.00% | +599,601+884.6% | Added |
| UBS Oconnor LLC | 555,645 | $1.29M | 0.04% | +259,231+87.5% | Added |
| FMR LLC | 535,628 | $1.24M | 0.00% | −44,161−7.6% | Reduced |
| Bank of New York Mellon Corp | 386,659 | $897.0K | 0.00% | +10,903+2.9% | Added |
| Jane Street Group, LLC | 371,023 | $860.8K | 0.00% | +98,018+35.9% | Added |
| Charles Schwab Investment Management Inc | 308,072 | $714.7K | 0.00% | +13,667+4.6% | Added |
| Readystate Asset Management LP | 295,038 | $684.5K | 0.04% | +295,038 | New |
| Panagora Asset Management Inc | 251,382 | $583.2K | 0.00% | −411−0.2% | Reduced |
| Bridgeway Capital Management, LLC | 232,300 | $538.9K | 0.01% | −349,400−60.1% | Reduced |
| Los Angeles Capital Management LLC | 197,470 | $458.1K | 0.00% | 00.0% | Unchanged |
| Acadian Asset Management LLC | 175,808 | $407.0K | 0.00% | −178,267−50.3% | Reduced |
| Two Sigma Investments, LP | 171,345 | $397.5K | 0.00% | +22,279+14.9% | Added |
| Bank of America Corp | 162,064 | $376.0K | 0.00% | +44,692+38.1% | Added |
| Rhumbline Advisers | 160,071 | $371.4K | 0.00% | −50.0% | Reduced |
| Marshall Wace, LLP | 157,800 | $366.1K | 0.00% | 00.0% | Unchanged |
| UBS Group AG | 153,276 | $355.6K | 0.00% | +96,333+169.2% | Added |
| Susquehanna International Group, LLP | 152,781 | $354.5K | 0.00% | −28,071−15.5% | Reduced |
| Barclays PLC | 152,064 | $352.8K | 0.00% | +117,910+345.2% | Added |
| Two Sigma Advisers, LP | 151,400 | $351.2K | 0.00% | −209,300−58.0% | Reduced |
| Macquarie Group Ltd | 150,000 | $348.0K | 0.00% | 00.0% | Unchanged |
| Foundations Investment Advisors, LLC | 102,000 | $344.8K | 0.01% | +102,000 | New |
| Goldman Sachs Group Inc | 145,565 | $337.7K | 0.00% | −191,488−56.8% | Reduced |
| Amundi | 95,540 | $308.6K | 0.00% | +95,540 | New |
| Alliancebernstein L.P. | 118,180 | $274.2K | 0.00% | −12,560−9.6% | Reduced |
| Cubist Systematic Strategies, LLC | 115,656 | $268.3K | 0.00% | +54,899+90.4% | Added |
| HRT Financial LP | 105,815 | $245.0K | 0.00% | +41,636+64.9% | Added |
| Dimensional Fund Advisors LP | 101,665 | $235.9K | 0.00% | −10,553−9.4% | Reduced |
| Exchange Traded Concepts, LLC | 98,729 | $229.1K | 0.01% | +25,035+34.0% | Added |
| Susquehanna Portfolio Strategies, LLC | 93,878 | $217.8K | 0.00% | +93,878 | New |
| JPMorgan Chase & Co | 78,823 | $182.9K | 0.00% | −188,192−70.5% | Reduced |
| LPL Financial LLC | 76,694 | $177.9K | 0.00% | +76,694 | New |
| Price T Rowe Associates Inc | 74,970 | $174.0K | 0.00% | −12,143−13.9% | Reduced |
| Nuveen Asset Management, LLC | 65,881 | $152.8K | 0.00% | 00.0% | Unchanged |
| QVT Financial LP | 62,657 | $145.4K | 0.01% | 00.0% | Unchanged |
| American International Group, Inc. | 55,108 | $127.9K | 0.00% | +2,588+4.9% | Added |
| Invesco Ltd. | 48,730 | $113.1K | 0.00% | −16,302−25.1% | Reduced |
| Harbor Capital Advisors, Inc. | 47,472 | $110.1K | 0.02% | +10,410+28.1% | Added |
| MetLife Investment Management | 46,642 | $108.2K | 0.00% | 00.0% | Unchanged |
| Voya Investment Management LLC | 46,033 | $106.8K | 0.00% | +2,402+5.5% | Added |
| Man Group plc | 44,600 | $103.5K | 0.00% | +44,600 | New |
| Engineers Gate Manager LP | 43,694 | $101.4K | 0.00% | +18,606+74.2% | Added |
| BNP Paribas Arbitrage, SA | 42,496 | $98.6K | 0.00% | −80,849−65.5% | Reduced |
| Manufacturers Life Insurance Company, The | 41,657 | $96.6K | 0.00% | 00.0% | Unchanged |
| Ameriprise Financial Inc | 41,004 | $95.1K | 0.00% | +41,004 | New |
| SG Americas Securities, LLC | 39,226 | $91.0K | 0.00% | −7,414−15.9% | Reduced |
| New York State Common Retirement Fund | 37,249 | $86.4K | 0.00% | −107−0.3% | Reduced |
| Royal Bank of Canada | 34,863 | $81.0K | 0.00% | +19,933+133.5% | Added |
| Principal Financial Group Inc | 33,477 | $77.7K | 0.00% | +1,726+5.4% | Added |
| AQR Capital Management LLC | 31,559 | $73.2K | 0.00% | −111,613−78.0% | Reduced |
| Group One Trading, L.P. | 31,081 | $72.1K | 0.00% | −10,987−26.1% | Reduced |
| Wells Fargo & Company | 30,831 | $71.5K | 0.00% | +7,806+33.9% | Added |
| Legal & General Group Plc | 29,527 | $68.5K | 0.00% | −23,635−44.5% | Reduced |
| State Board of Administration of Florida Retirement System | 28,800 | $66.8K | 0.00% | +28,800 | New |
| Hunter Perkins Capital Management, LLC | 25,700 | $60.0K | 0.01% | −11,300−30.5% | Reduced |
| Point72 Middle East FZE | 25,511 | $59.2K | 0.00% | +1,167+4.8% | Added |
| Pale Fire Capital SE | 25,400 | $58.9K | 0.01% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 24,533 | $56.9K | 0.00% | −23,776−49.2% | Reduced |
| Prio Wealth Limited Partnership | 23,529 | $54.6K | 0.00% | 00.0% | Unchanged |
| Jasper Ridge Partners, L.P. | 23,100 | $53.6K | 0.00% | 00.0% | Unchanged |
| ProShare Advisors LLC | 18,350 | $42.6K | 0.00% | −3,200−14.8% | Reduced |
| California State Teachers Retirement System | 18,249 | $42.3K | 0.00% | −80,710−81.6% | Reduced |
| Nisa Investment Advisors, LLC | 17,643 | $40.9K | 0.00% | +14,600+479.8% | Added |
| Citigroup Inc | 15,974 | $37.1K | 0.00% | +14,239+820.7% | Added |
| Public Employees Retirement System of Ohio | 15,800 | $36.7K | 0.00% | +15,800 | New |
| Grimes & Company, Inc. | 15,662 | $36.3K | 0.00% | −474−2.9% | Reduced |
| Squarepoint Ops LLC | 13,668 | $31.7K | 0.00% | +13,668 | New |
| Victory Capital Management Inc | 12,732 | $29.5K | 0.00% | +12,732 | New |
| Bayesian Capital Management, LP | 11,900 | $27.6K | 0.00% | +11,900 | New |
| Graham Capital Management, L.P. | 11,811 | $27.4K | 0.00% | −35,013−74.8% | Reduced |
| Amalgamated Bank | 11,766 | $27.0K | 0.00% | −913−7.2% | Reduced |
| Quantbot Technologies LP | 10,945 | $25.4K | 0.00% | +10,945 | New |
| Ameritas Investment Partners, Inc. | 9,896 | $23.0K | 0.00% | 00.0% | Unchanged |
| Simplex Trading, LLC | 5,817 | $13.0K | 0.00% | −5,453−48.4% | Reduced |
| Advisor Group Holdings, Inc. | 3,835 | $8.89K | 0.00% | −92−2.3% | Reduced |
| STRS Ohio | 2,500 | $5.00K | 0.00% | 00.0% | Unchanged |