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 2021
Institutional positions in Mersana Therapeutics, Inc. as of Dec 31, 2021. 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
- 122
- +14 vs. Q3 2021
- Shares held
- 70.2M
- +1.51M (+2.2%) vs. Q3 2021
- Total value
- $436.6M
- −$211.1M (−32.6%) vs. Q3 2021
- New holders
- 30
- 45 more added
- Sold out
- 16
- 24 more reduced
2 institutions that held it in Q3 2021 haven't filed for Q4 2021 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2021: 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 2021
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q3 2021.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock Inc. | 7,479,229 | $46.5M | 0.00% | −1,328,099−15.1% | Reduced |
| Avoro Capital Advisors LLC | 6,800,000 | $42.3M | 0.72% | 00.0% | Unchanged |
| Bain Capital Life Sciences Investors, LLC | 5,385,667 | $33.5M | 2.66% | +1,690,000+45.7% | Added |
| Wellington Management Group LLP | 5,017,078 | $31.2M | 0.00% | −990,297−16.5% | Reduced |
| Sarissa Capital Management LP | 4,299,297 | $26.7M | 2.31% | 00.0% | Unchanged |
| State Street Corp | 4,220,557 | $26.3M | 0.00% | +130,361+3.2% | Added |
| Bellevue Group AG | 4,164,000 | $25.9M | 0.27% | −97,000−2.3% | Reduced |
| Vanguard Group Inc | 3,607,431 | $22.4M | 0.00% | −74,163−2.0% | Reduced |
| Rock Springs Capital Management LP | 3,248,950 | $20.2M | 0.47% | +228,248+7.6% | Added |
| OrbiMed Advisors LLC | 2,888,847 | $18.0M | 0.23% | 00.0% | Unchanged |
| Candriam Luxembourg S.C.A. | 2,022,895 | $12.6M | 0.08% | 00.0% | Unchanged |
| Morgan Stanley | 1,228,607 | $7.64M | 0.00% | +560,718+84.0% | Added |
| Goldman Sachs Group Inc | 1,209,612 | $7.52M | 0.00% | +64,243+5.6% | Added |
| Artal Group S.A. | 1,200,000 | $7.46M | 0.22% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 1,137,001 | $7.07M | 0.00% | +72,666+6.8% | Added |
| Assenagon Asset Management S.A. | 1,073,748 | $6.68M | 0.02% | +169,882+18.8% | Added |
| CIBC Asset Management Inc | 1,055,994 | $6.57M | 0.02% | −2,804−0.3% | Reduced |
| Two Sigma Advisers, LP | 1,050,200 | $6.53M | 0.02% | +420,200+66.7% | Added |
| Two Sigma Investments, LP | 877,752 | $5.46M | 0.01% | +529,507+152.1% | Added |
| Point72 Asset Management, L.P. | 818,100 | $5.09M | 0.02% | +818,100 | New |
| Rho Capital Partners Inc | 796,458 | $4.95M | 3.22% | 00.0% | Unchanged |
| Northern Trust Corp | 747,876 | $4.65M | 0.00% | +50,863+7.3% | Added |
| D. E. Shaw & Co., Inc. | 644,903 | $4.01M | 0.00% | +596,298+1,226.8% | Added |
| Millennium Management LLC | 636,084 | $3.96M | 0.00% | +532,347+513.2% | Added |
| BNP Paribas Arbitrage, SA | 618,416 | $3.85M | 0.01% | +546,636+761.5% | Added |
| Platinum Investment Management Ltd | 495,481 | $3.08M | 0.09% | +384,575+346.8% | Added |
| Charles Schwab Investment Management Inc | 488,005 | $3.04M | 0.00% | +5,695+1.2% | Added |
| Walleye Capital LLC | 394,760 | $2.46M | 0.08% | +275,458+230.9% | Added |
| Renaissance Technologies LLC | 342,600 | $2.13M | 0.00% | +342,600 | New |
| Citadel Advisors LLC | 308,507 | $1.92M | 0.00% | +261,664+558.6% | Added |
| Nuveen Asset Management, LLC | 292,957 | $1.82M | 0.00% | +16,769+6.1% | Added |
| Hudson Bay Capital Management LP | 290,000 | $1.80M | 0.02% | +115,000+65.7% | Added |
| Bank of New York Mellon Corp | 279,930 | $1.74M | 0.00% | +9,121+3.4% | Added |
| Rafferty Asset Management, LLC | 278,798 | $1.73M | 0.01% | +116,762+72.1% | Added |
| Allianz Asset Management GmbH | 274,368 | $1.71M | 0.00% | +41,911+18.0% | Added |
| Fred Alger Management, LLC | 228,490 | $1.42M | 0.00% | +228,490 | New |
| Citigroup Inc | 227,032 | $1.41M | 0.00% | +113,681+100.3% | Added |
| Federated Hermes, Inc. | 202,583 | $1.26M | 0.00% | +202,583 | New |
| Dimensional Fund Advisors LP | 194,516 | $1.21M | 0.00% | +7,000+3.7% | Added |
| UBS Group AG | 181,163 | $1.13M | 0.00% | +92,932+105.3% | Added |
| Macquarie Group Ltd | 154,418 | $960.0K | 0.00% | −2,346−1.5% | Reduced |
| AXA S.A. | 148,000 | $921.0K | 0.00% | +148,000 | New |
| DAFNA Capital Management LLC | 140,263 | $872.0K | 0.22% | 00.0% | Unchanged |
| Swiss National Bank | 126,396 | $786.0K | 0.00% | +3,400+2.8% | Added |
| Susquehanna International Group, LLP | 121,957 | $759.0K | 0.00% | +28,216+30.1% | Added |
| FMR LLC | 121,687 | $757.0K | 0.00% | −116,347−48.9% | Reduced |
| HRT Financial LP | 116,922 | $727.0K | 0.00% | +116,922 | New |
| Price T Rowe Associates Inc | 114,447 | $712.0K | 0.00% | −866,449−88.3% | Reduced |
| Cubist Systematic Strategies, LLC | 112,312 | $699.0K | 0.01% | +112,312 | New |
| PDT Partners, LLC | 111,670 | $695.0K | 0.05% | +81,175+266.2% | Added |
| Nomura Holdings Inc | 97,865 | $609.0K | 0.00% | +97,865 | New |
| Barclays PLC | 90,119 | $561.0K | 0.00% | +57,103+173.0% | Added |
| California State Teachers Retirement System | 87,246 | $543.0K | 0.00% | +3,536+4.2% | Added |
| Gsa Capital Partners LLP | 87,065 | $542.0K | 0.07% | +87,065 | New |
| Voloridge Investment Management, LLC | 84,616 | $526.0K | 0.00% | −11,835−12.3% | Reduced |
| Rhumbline Advisers | 80,777 | $502.0K | 0.00% | −1,966−2.4% | Reduced |
| Alliancebernstein L.P. | 77,100 | $480.0K | 0.00% | +5,100+7.1% | Added |
| Deutsche Bank AG | 77,012 | $479.0K | 0.00% | −27,195−26.1% | Reduced |
| Jump Financial, LLC | 72,900 | $453.0K | 0.03% | +72,900 | New |
| State of Wisconsin Investment Board | 71,600 | $445.0K | 0.00% | 00.0% | Unchanged |
| Credit Suisse AG | 66,721 | $415.0K | 0.00% | +14,625+28.1% | Added |
| Squarepoint Ops LLC | 66,672 | $415.0K | 0.00% | +66,672 | New |
| QVT Financial LP | 62,657 | $390.0K | 0.01% | 00.0% | Unchanged |
| Walleye Trading LLC | 61,715 | $384.0K | 0.01% | +38,065+161.0% | Added |
| Qube Research & Technologies Ltd | 57,757 | $359.0K | 0.00% | +57,757 | New |
| New York State Common Retirement Fund | 51,808 | $322.0K | 0.00% | −56−0.1% | Reduced |
| Jane Street Group, LLC | 51,523 | $320.0K | 0.00% | +5,891+12.9% | Added |
| Teachers Retirement System of the State of Kentucky | 47,980 | $298.0K | 0.00% | 00.0% | Unchanged |
| UBS Asset Management Americas Inc | 43,419 | $270.1K | 0.00% | 00.0% | Unchanged |
| Bank of America Corp | 42,847 | $266.0K | 0.00% | −34,538−44.6% | Reduced |
| Wells Fargo & Company | 41,742 | $259.0K | 0.00% | +36,382+678.8% | Added |
| Trexquant Investment LP | 41,317 | $257.0K | 0.02% | +41,317 | New |
| Manufacturers Life Insurance Company, The | 38,574 | $240.0K | 0.00% | +521+1.4% | Added |
| American International Group, Inc. | 38,034 | $237.0K | 0.00% | −1,138−2.9% | Reduced |
| Dynamic Technology Lab Private Ltd | 32,871 | $204.0K | 0.02% | +32,871 | New |
| JPMorgan Chase & Co | 31,582 | $197.0K | 0.00% | +64+0.2% | Added |
| ExodusPoint Capital Management, LP | 30,411 | $189.0K | 0.00% | +30,411 | New |
| Virtus ETF Advisers LLC | 29,974 | $186.0K | 0.07% | +15,809+111.6% | Added |
| Invesco Ltd. | 29,718 | $185.0K | 0.00% | −2,493−7.7% | Reduced |
| Parametric Portfolio Associates LLC | 29,586 | $184.0K | 0.00% | −3,986−11.9% | Reduced |
| State Board of Administration of Florida Retirement System | 27,282 | $170.0K | 0.00% | +165+0.6% | Added |
| MetLife Investment Management | 27,023 | $168.1K | 0.00% | +9,655+55.6% | Added |
| Voya Investment Management LLC | 26,326 | $164.0K | 0.00% | −112−0.4% | Reduced |
| ProShare Advisors LLC | 25,767 | $161.0K | 0.00% | +1,268+5.2% | Added |
| Legal & General Group Plc | 25,114 | $156.0K | 0.00% | 00.0% | Unchanged |
| Algert Global LLC | 25,102 | $156.0K | 0.02% | +7,210+40.3% | Added |
| Prio Wealth Limited Partnership | 23,529 | $146.0K | 0.00% | 00.0% | Unchanged |
| Jasper Ridge Partners, L.P. | 23,100 | $144.0K | 0.01% | 00.0% | Unchanged |
| Engineers Gate Manager LP | 20,500 | $128.0K | 0.01% | +20,500 | New |
| Tower Research Capital LLC (TRC) | 19,846 | $124.0K | 0.00% | +11,153+128.3% | Added |
| Truist Financial Corp | 16,700 | $104.0K | 0.00% | 00.0% | Unchanged |
| SG Americas Securities, LLC | 16,263 | $101.0K | 0.00% | −20,450−55.7% | Reduced |
| Alpine Global Management, LLC | 15,839 | $99.0K | 0.01% | +15,839 | New |
| Bridgefront Capital, LLC | 15,622 | $97.0K | 0.09% | +15,622 | New |
| Arizona State Retirement System | 15,451 | $96.0K | 0.00% | +293+1.9% | Added |
| Royal Bank of Canada | 15,098 | $94.0K | 0.00% | +8,157+117.5% | Added |
| Balyasny Asset Management LLC | 14,630 | $91.0K | 0.00% | +14,630 | New |
| Martingale Asset Management L P | 12,045 | $75.0K | 0.00% | +12,045 | New |
| Amalgamated Bank | 11,636 | $72.0K | 0.00% | −214−1.8% | Reduced |
| XTX Topco Ltd | 11,640 | $72.0K | 0.04% | +11,640 | New |