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 |
|---|---|---|---|---|---|
| Farther Finance Advisors, LLC | 1 | $2 | 0.00% | +1 | New |
| Advisory Services Network, LLC | 100 | $232 | 0.00% | +100 | New |
| North Star Investment Management Corp. | 150 | $348 | 0.00% | 00.0% | Unchanged |
| The PNC Financial Services Group, Inc. | 200 | $464 | 0.00% | +200 | New |
| Russell Investments Group, Ltd. | 878 | $2.04K | 0.00% | 00.0% | Unchanged |
| Metropolitan Life Insurance Co | 1,558 | $3.62K | 0.00% | −3,548−69.5% | Reduced |
| STRS Ohio | 2,500 | $5.00K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 3,835 | $8.89K | 0.00% | −92−2.3% | Reduced |
| Simplex Trading, LLC | 5,817 | $13.0K | 0.00% | −5,453−48.4% | Reduced |
| Ameritas Investment Partners, Inc. | 9,896 | $23.0K | 0.00% | 00.0% | Unchanged |
| Quantbot Technologies LP | 10,945 | $25.4K | 0.00% | +10,945 | New |
| Amalgamated Bank | 11,766 | $27.0K | 0.00% | −913−7.2% | Reduced |
| Graham Capital Management, L.P. | 11,811 | $27.4K | 0.00% | −35,013−74.8% | Reduced |
| Bayesian Capital Management, LP | 11,900 | $27.6K | 0.00% | +11,900 | New |
| Victory Capital Management Inc | 12,732 | $29.5K | 0.00% | +12,732 | New |
| Squarepoint Ops LLC | 13,668 | $31.7K | 0.00% | +13,668 | New |
| Grimes & Company, Inc. | 15,662 | $36.3K | 0.00% | −474−2.9% | Reduced |
| Public Employees Retirement System of Ohio | 15,800 | $36.7K | 0.00% | +15,800 | New |
| Citigroup Inc | 15,974 | $37.1K | 0.00% | +14,239+820.7% | Added |
| Nisa Investment Advisors, LLC | 17,643 | $40.9K | 0.00% | +14,600+479.8% | Added |
| California State Teachers Retirement System | 18,249 | $42.3K | 0.00% | −80,710−81.6% | Reduced |
| ProShare Advisors LLC | 18,350 | $42.6K | 0.00% | −3,200−14.8% | Reduced |
| Jasper Ridge Partners, L.P. | 23,100 | $53.6K | 0.00% | 00.0% | Unchanged |
| Prio Wealth Limited Partnership | 23,529 | $54.6K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 24,533 | $56.9K | 0.00% | −23,776−49.2% | Reduced |
| Pale Fire Capital SE | 25,400 | $58.9K | 0.01% | 00.0% | Unchanged |
| Point72 Middle East FZE | 25,511 | $59.2K | 0.00% | +1,167+4.8% | Added |
| Hunter Perkins Capital Management, LLC | 25,700 | $60.0K | 0.01% | −11,300−30.5% | Reduced |
| State Board of Administration of Florida Retirement System | 28,800 | $66.8K | 0.00% | +28,800 | New |
| Legal & General Group Plc | 29,527 | $68.5K | 0.00% | −23,635−44.5% | Reduced |
| Wells Fargo & Company | 30,831 | $71.5K | 0.00% | +7,806+33.9% | Added |
| Group One Trading, L.P. | 31,081 | $72.1K | 0.00% | −10,987−26.1% | Reduced |
| AQR Capital Management LLC | 31,559 | $73.2K | 0.00% | −111,613−78.0% | Reduced |
| Principal Financial Group Inc | 33,477 | $77.7K | 0.00% | +1,726+5.4% | Added |
| Royal Bank of Canada | 34,863 | $81.0K | 0.00% | +19,933+133.5% | Added |
| New York State Common Retirement Fund | 37,249 | $86.4K | 0.00% | −107−0.3% | Reduced |
| SG Americas Securities, LLC | 39,226 | $91.0K | 0.00% | −7,414−15.9% | Reduced |
| Ameriprise Financial Inc | 41,004 | $95.1K | 0.00% | +41,004 | New |
| Manufacturers Life Insurance Company, The | 41,657 | $96.6K | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 42,496 | $98.6K | 0.00% | −80,849−65.5% | Reduced |
| Engineers Gate Manager LP | 43,694 | $101.4K | 0.00% | +18,606+74.2% | Added |
| Man Group plc | 44,600 | $103.5K | 0.00% | +44,600 | New |
| Voya Investment Management LLC | 46,033 | $106.8K | 0.00% | +2,402+5.5% | Added |
| MetLife Investment Management | 46,642 | $108.2K | 0.00% | 00.0% | Unchanged |
| Harbor Capital Advisors, Inc. | 47,472 | $110.1K | 0.02% | +10,410+28.1% | Added |
| Invesco Ltd. | 48,730 | $113.1K | 0.00% | −16,302−25.1% | Reduced |
| American International Group, Inc. | 55,108 | $127.9K | 0.00% | +2,588+4.9% | Added |
| QVT Financial LP | 62,657 | $145.4K | 0.01% | 00.0% | Unchanged |
| Nuveen Asset Management, LLC | 65,881 | $152.8K | 0.00% | 00.0% | Unchanged |
| Price T Rowe Associates Inc | 74,970 | $174.0K | 0.00% | −12,143−13.9% | Reduced |
| LPL Financial LLC | 76,694 | $177.9K | 0.00% | +76,694 | New |
| JPMorgan Chase & Co | 78,823 | $182.9K | 0.00% | −188,192−70.5% | Reduced |
| Susquehanna Portfolio Strategies, LLC | 93,878 | $217.8K | 0.00% | +93,878 | New |
| Exchange Traded Concepts, LLC | 98,729 | $229.1K | 0.01% | +25,035+34.0% | Added |
| Dimensional Fund Advisors LP | 101,665 | $235.9K | 0.00% | −10,553−9.4% | Reduced |
| HRT Financial LP | 105,815 | $245.0K | 0.00% | +41,636+64.9% | Added |
| Cubist Systematic Strategies, LLC | 115,656 | $268.3K | 0.00% | +54,899+90.4% | Added |
| Alliancebernstein L.P. | 118,180 | $274.2K | 0.00% | −12,560−9.6% | Reduced |
| Amundi | 95,540 | $308.6K | 0.00% | +95,540 | New |
| Goldman Sachs Group Inc | 145,565 | $337.7K | 0.00% | −191,488−56.8% | Reduced |
| Foundations Investment Advisors, LLC | 102,000 | $344.8K | 0.01% | +102,000 | New |
| Macquarie Group Ltd | 150,000 | $348.0K | 0.00% | 00.0% | Unchanged |
| Two Sigma Advisers, LP | 151,400 | $351.2K | 0.00% | −209,300−58.0% | Reduced |
| Barclays PLC | 152,064 | $352.8K | 0.00% | +117,910+345.2% | Added |
| Susquehanna International Group, LLP | 152,781 | $354.5K | 0.00% | −28,071−15.5% | Reduced |
| UBS Group AG | 153,276 | $355.6K | 0.00% | +96,333+169.2% | Added |
| Marshall Wace, LLP | 157,800 | $366.1K | 0.00% | 00.0% | Unchanged |
| Rhumbline Advisers | 160,071 | $371.4K | 0.00% | −50.0% | Reduced |
| Bank of America Corp | 162,064 | $376.0K | 0.00% | +44,692+38.1% | Added |
| Two Sigma Investments, LP | 171,345 | $397.5K | 0.00% | +22,279+14.9% | Added |
| Acadian Asset Management LLC | 175,808 | $407.0K | 0.00% | −178,267−50.3% | Reduced |
| Los Angeles Capital Management LLC | 197,470 | $458.1K | 0.00% | 00.0% | Unchanged |
| Bridgeway Capital Management, LLC | 232,300 | $538.9K | 0.01% | −349,400−60.1% | Reduced |
| Panagora Asset Management Inc | 251,382 | $583.2K | 0.00% | −411−0.2% | Reduced |
| Readystate Asset Management LP | 295,038 | $684.5K | 0.04% | +295,038 | New |
| Charles Schwab Investment Management Inc | 308,072 | $714.7K | 0.00% | +13,667+4.6% | Added |
| Jane Street Group, LLC | 371,023 | $860.8K | 0.00% | +98,018+35.9% | Added |
| Bank of New York Mellon Corp | 386,659 | $897.0K | 0.00% | +10,903+2.9% | Added |
| FMR LLC | 535,628 | $1.24M | 0.00% | −44,161−7.6% | Reduced |
| UBS Oconnor LLC | 555,645 | $1.29M | 0.04% | +259,231+87.5% | Added |
| D. E. Shaw & Co., Inc. | 667,383 | $1.55M | 0.00% | +599,601+884.6% | Added |
| Atom Investors LP | 774,659 | $1.80M | 0.32% | +481,482+164.2% | Added |
| Renaissance Technologies LLC | 865,731 | $2.01M | 0.00% | −60,188−6.5% | Reduced |
| Jacobs Levy Equity Management, Inc | 930,607 | $2.16M | 0.01% | +930,607 | New |
| Northern Trust Corp | 931,406 | $2.16M | 0.00% | −99,180−9.6% | Reduced |
| Affinity Asset Advisors, LLC | 1,000,000 | $2.32M | 0.46% | −1,850,000−64.9% | Reduced |
| Baker Bros. Advisors LP | 1,086,115 | $2.52M | 0.03% | 00.0% | Unchanged |
| Deutsche Bank AG | 1,139,232 | $2.64M | 0.00% | +1,076,405+1,713.3% | Added |
| Schonfeld Strategic Advisors LLC | 1,139,407 | $2.64M | 0.02% | +1,139,407 | New |
| Philosophy Capital Management LLC | 1,264,567 | $2.93M | 0.59% | −1,078,067−46.0% | Reduced |
| 5AM Venture Management, LLC | 1,305,000 | $3.03M | 0.80% | 00.0% | Unchanged |
| Citadel Advisors LLC | 1,926,931 | $4.47M | 0.00% | +312,208+19.3% | Added |
| Geode Capital Management, LLC | 2,297,136 | $5.33M | 0.00% | +139,471+6.5% | Added |
| State Street Corp | 2,329,434 | $5.40M | 0.00% | +16,692+0.7% | Added |
| Acuta Capital Partners, LLC | 2,368,000 | $5.49M | 3.09% | +2,268,393+2,277.3% | Added |
| Rock Springs Capital Management LP | 3,046,782 | $7.07M | 0.17% | −356,351−10.5% | Reduced |
| Millennium Management LLC | 3,394,440 | $7.88M | 0.01% | +1,216,790+55.9% | Added |
| Morgan Stanley | 4,134,546 | $9.59M | 0.00% | +3,148,529+319.3% | Added |
| Nextech Invest AG | 5,978,327 | $13.9M | 2.58% | +5,978,327 | New |
| Vanguard Group Inc | 6,237,588 | $14.5M | 0.00% | +51,465+0.8% | Added |