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 |
|---|---|---|---|---|---|
| North Star Investment Management Corp. | 150 | $1.00K | 0.00% | 00.0% | Unchanged |
| CWM, LLC | 109 | $1.00K | 0.00% | +109 | New |
| Captrust Financial Advisors | 358 | $2.00K | 0.00% | −70−16.4% | Reduced |
| Daiwa Securities Group Inc. | 246 | $2.00K | 0.00% | 00.0% | Unchanged |
| Nisa Investment Advisors, LLC | 610 | $3.00K | 0.00% | 00.0% | Unchanged |
| The PNC Financial Services Group, Inc. | 478 | $3.00K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 877 | $5.00K | 0.00% | 00.0% | Unchanged |
| Cutler Group LP | 1,200 | $7.00K | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 1,323 | $8.00K | 0.00% | −2,526−65.6% | Reduced |
| Parallel Advisors, LLC | 1,276 | $8.00K | 0.00% | +1,276 | New |
| STRS Ohio | 2,500 | $15.0K | 0.00% | +2,500 | New |
| Great West Life Assurance Co | 3,638 | $23.0K | 0.00% | 00.0% | Unchanged |
| Ameritas Investment Partners, Inc. | 5,400 | $34.0K | 0.00% | 00.0% | Unchanged |
| Dark Forest Capital Management LP | 7,421 | $46.0K | 0.02% | +7,421 | New |
| Ensign Peak Advisors, Inc | 9,040 | $56.0K | 0.00% | +9,040 | New |
| Point72 Hong Kong Ltd | 9,173 | $57.0K | 0.00% | +9,173 | New |
| Metropolitan Life Insurance Co | 9,522 | $59.2K | 0.00% | −5,430−36.3% | Reduced |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 9,826 | $61.0K | 0.00% | −266−2.6% | Reduced |
| Empirical Asset Management, LLC | 10,000 | $62.0K | 0.06% | +10,000 | New |
| Principal Financial Group Inc | 10,511 | $65.0K | 0.00% | −15,502−59.6% | Reduced |
| Teacher Retirement System of Texas | 10,819 | $67.0K | 0.00% | +10,819 | New |
| Janus Henderson Group PLC | 11,207 | $70.0K | 0.00% | +11,207 | 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 |
| Martingale Asset Management L P | 12,045 | $75.0K | 0.00% | +12,045 | New |
| Balyasny Asset Management LLC | 14,630 | $91.0K | 0.00% | +14,630 | New |
| Royal Bank of Canada | 15,098 | $94.0K | 0.00% | +8,157+117.5% | Added |
| Arizona State Retirement System | 15,451 | $96.0K | 0.00% | +293+1.9% | Added |
| Bridgefront Capital, LLC | 15,622 | $97.0K | 0.09% | +15,622 | New |
| Alpine Global Management, LLC | 15,839 | $99.0K | 0.01% | +15,839 | New |
| SG Americas Securities, LLC | 16,263 | $101.0K | 0.00% | −20,450−55.7% | Reduced |
| Truist Financial Corp | 16,700 | $104.0K | 0.00% | 00.0% | Unchanged |
| Tower Research Capital LLC (TRC) | 19,846 | $124.0K | 0.00% | +11,153+128.3% | Added |
| Engineers Gate Manager LP | 20,500 | $128.0K | 0.01% | +20,500 | New |
| Jasper Ridge Partners, L.P. | 23,100 | $144.0K | 0.01% | 00.0% | Unchanged |
| Prio Wealth Limited Partnership | 23,529 | $146.0K | 0.00% | 00.0% | Unchanged |
| 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 |
| ProShare Advisors LLC | 25,767 | $161.0K | 0.00% | +1,268+5.2% | Added |
| Voya Investment Management LLC | 26,326 | $164.0K | 0.00% | −112−0.4% | Reduced |
| MetLife Investment Management | 27,023 | $168.1K | 0.00% | +9,655+55.6% | Added |
| State Board of Administration of Florida Retirement System | 27,282 | $170.0K | 0.00% | +165+0.6% | Added |
| Parametric Portfolio Associates LLC | 29,586 | $184.0K | 0.00% | −3,986−11.9% | Reduced |
| Invesco Ltd. | 29,718 | $185.0K | 0.00% | −2,493−7.7% | Reduced |
| Virtus ETF Advisers LLC | 29,974 | $186.0K | 0.07% | +15,809+111.6% | Added |
| ExodusPoint Capital Management, LP | 30,411 | $189.0K | 0.00% | +30,411 | New |
| JPMorgan Chase & Co | 31,582 | $197.0K | 0.00% | +64+0.2% | Added |
| Dynamic Technology Lab Private Ltd | 32,871 | $204.0K | 0.02% | +32,871 | New |
| American International Group, Inc. | 38,034 | $237.0K | 0.00% | −1,138−2.9% | Reduced |
| Manufacturers Life Insurance Company, The | 38,574 | $240.0K | 0.00% | +521+1.4% | Added |
| Trexquant Investment LP | 41,317 | $257.0K | 0.02% | +41,317 | New |
| Wells Fargo & Company | 41,742 | $259.0K | 0.00% | +36,382+678.8% | Added |
| Bank of America Corp | 42,847 | $266.0K | 0.00% | −34,538−44.6% | Reduced |
| UBS Asset Management Americas Inc | 43,419 | $270.1K | 0.00% | 00.0% | Unchanged |
| Teachers Retirement System of the State of Kentucky | 47,980 | $298.0K | 0.00% | 00.0% | Unchanged |
| Jane Street Group, LLC | 51,523 | $320.0K | 0.00% | +5,891+12.9% | Added |
| New York State Common Retirement Fund | 51,808 | $322.0K | 0.00% | −56−0.1% | Reduced |
| Qube Research & Technologies Ltd | 57,757 | $359.0K | 0.00% | +57,757 | New |
| Walleye Trading LLC | 61,715 | $384.0K | 0.01% | +38,065+161.0% | Added |
| QVT Financial LP | 62,657 | $390.0K | 0.01% | 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 |
| State of Wisconsin Investment Board | 71,600 | $445.0K | 0.00% | 00.0% | Unchanged |
| Jump Financial, LLC | 72,900 | $453.0K | 0.03% | +72,900 | New |
| Deutsche Bank AG | 77,012 | $479.0K | 0.00% | −27,195−26.1% | Reduced |
| Alliancebernstein L.P. | 77,100 | $480.0K | 0.00% | +5,100+7.1% | Added |
| Rhumbline Advisers | 80,777 | $502.0K | 0.00% | −1,966−2.4% | Reduced |
| Voloridge Investment Management, LLC | 84,616 | $526.0K | 0.00% | −11,835−12.3% | Reduced |
| Gsa Capital Partners LLP | 87,065 | $542.0K | 0.07% | +87,065 | New |
| California State Teachers Retirement System | 87,246 | $543.0K | 0.00% | +3,536+4.2% | Added |
| Barclays PLC | 90,119 | $561.0K | 0.00% | +57,103+173.0% | Added |
| Nomura Holdings Inc | 97,865 | $609.0K | 0.00% | +97,865 | New |
| PDT Partners, LLC | 111,670 | $695.0K | 0.05% | +81,175+266.2% | Added |
| Cubist Systematic Strategies, LLC | 112,312 | $699.0K | 0.01% | +112,312 | New |
| Price T Rowe Associates Inc | 114,447 | $712.0K | 0.00% | −866,449−88.3% | Reduced |
| HRT Financial LP | 116,922 | $727.0K | 0.00% | +116,922 | New |
| FMR LLC | 121,687 | $757.0K | 0.00% | −116,347−48.9% | Reduced |
| Susquehanna International Group, LLP | 121,957 | $759.0K | 0.00% | +28,216+30.1% | Added |
| Swiss National Bank | 126,396 | $786.0K | 0.00% | +3,400+2.8% | Added |
| DAFNA Capital Management LLC | 140,263 | $872.0K | 0.22% | 00.0% | Unchanged |
| AXA S.A. | 148,000 | $921.0K | 0.00% | +148,000 | New |
| Macquarie Group Ltd | 154,418 | $960.0K | 0.00% | −2,346−1.5% | Reduced |
| UBS Group AG | 181,163 | $1.13M | 0.00% | +92,932+105.3% | Added |
| Dimensional Fund Advisors LP | 194,516 | $1.21M | 0.00% | +7,000+3.7% | Added |
| Federated Hermes, Inc. | 202,583 | $1.26M | 0.00% | +202,583 | New |
| Citigroup Inc | 227,032 | $1.41M | 0.00% | +113,681+100.3% | Added |
| Fred Alger Management, LLC | 228,490 | $1.42M | 0.00% | +228,490 | New |
| Allianz Asset Management GmbH | 274,368 | $1.71M | 0.00% | +41,911+18.0% | Added |
| Rafferty Asset Management, LLC | 278,798 | $1.73M | 0.01% | +116,762+72.1% | Added |
| Bank of New York Mellon Corp | 279,930 | $1.74M | 0.00% | +9,121+3.4% | Added |
| Hudson Bay Capital Management LP | 290,000 | $1.80M | 0.02% | +115,000+65.7% | Added |
| Nuveen Asset Management, LLC | 292,957 | $1.82M | 0.00% | +16,769+6.1% | Added |
| Citadel Advisors LLC | 308,507 | $1.92M | 0.00% | +261,664+558.6% | Added |
| Renaissance Technologies LLC | 342,600 | $2.13M | 0.00% | +342,600 | New |
| Walleye Capital LLC | 394,760 | $2.46M | 0.08% | +275,458+230.9% | Added |
| Charles Schwab Investment Management Inc | 488,005 | $3.04M | 0.00% | +5,695+1.2% | Added |
| Platinum Investment Management Ltd | 495,481 | $3.08M | 0.09% | +384,575+346.8% | Added |
| BNP Paribas Arbitrage, SA | 618,416 | $3.85M | 0.01% | +546,636+761.5% | Added |
| Millennium Management LLC | 636,084 | $3.96M | 0.00% | +532,347+513.2% | Added |
| D. E. Shaw & Co., Inc. | 644,903 | $4.01M | 0.00% | +596,298+1,226.8% | Added |