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, Q3 2021
Institutional positions in Mersana Therapeutics, Inc. as of Sep 30, 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
- 110
- −20 vs. Q2 2021
- Shares held
- 68.7M
- −108.9K (−0.2%) vs. Q2 2021
- Total value
- $648.3M
- −$286.2M (−30.6%) vs. Q2 2021
- New holders
- 12
- 45 more added
- Sold out
- 32
- 34 more reduced
1 institution that held it in Q2 2021 haven't filed for Q3 2021 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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, Q3 2021
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q2 2021.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Ellevest, Inc. | 8 | $0 | 0.00% | +8 | New |
| North Star Investment Management Corp. | 150 | $1.00K | 0.00% | +150 | New |
| Simplex Trading, LLC | 173 | $2.00K | 0.00% | −100−36.6% | Reduced |
| Daiwa Securities Group Inc. | 246 | $2.00K | 0.00% | +117+90.7% | Added |
| Captrust Financial Advisors | 428 | $4.00K | 0.00% | 00.0% | Unchanged |
| The PNC Financial Services Group, Inc. | 478 | $5.00K | 0.00% | −12,640−96.4% | Reduced |
| Nisa Investment Advisors, LLC | 610 | $6.00K | 0.00% | −3,050−83.3% | Reduced |
| O'Shaughnessy Asset Management, LLC | 651 | $6.00K | 0.00% | 00.0% | Unchanged |
| Advisor Group Holdings, Inc. | 877 | $8.00K | 0.00% | +63+7.7% | Added |
| Cutler Group LP | 1,200 | $11.0K | 0.00% | −4,600−79.3% | Reduced |
| Penserra Capital Management LLC | 1,640 | $15.0K | 0.00% | +55+3.5% | Added |
| Great West Life Assurance Co | 3,638 | $34.0K | 0.00% | 00.0% | Unchanged |
| Group One Trading, L.P. | 3,849 | $36.0K | 0.00% | +3,849 | New |
| Wells Fargo & Company | 5,360 | $50.0K | 0.00% | +5,308+10,207.7% | Added |
| Ameritas Investment Partners, Inc. | 5,400 | $51.0K | 0.00% | 00.0% | Unchanged |
| First Mercantile Trust Co | 5,541 | $52.0K | 0.01% | −225−3.9% | Reduced |
| Royal Bank of Canada | 6,941 | $66.0K | 0.00% | +2,226+47.2% | Added |
| Tower Research Capital LLC (TRC) | 8,693 | $82.0K | 0.00% | +2,868+49.2% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 10,092 | $95.0K | 0.00% | +11+0.1% | Added |
| Fox Run Management, L.L.C. | 11,779 | $111.0K | 0.07% | +11,779 | New |
| Amalgamated Bank | 11,850 | $112.0K | 0.00% | −171−1.4% | Reduced |
| AQR Capital Management LLC | 12,330 | $116.0K | 0.00% | 00.0% | Unchanged |
| Allstate Corp | 13,667 | $129.0K | 0.01% | −329−2.4% | Reduced |
| Virtus ETF Advisers LLC | 14,165 | $134.0K | 0.06% | −747−5.0% | Reduced |
| Metropolitan Life Insurance Co | 14,952 | $141.0K | 0.00% | −4,820−24.4% | Reduced |
| Arizona State Retirement System | 15,158 | $143.0K | 0.00% | +262+1.8% | Added |
| Truist Financial Corp | 16,700 | $157.0K | 0.00% | 00.0% | Unchanged |
| MetLife Investment Management | 17,368 | $163.8K | 0.00% | −8,457−32.7% | Reduced |
| Algert Global LLC | 17,892 | $169.0K | 0.02% | +17,892 | New |
| Virtu Financial LLC | 18,777 | $177.0K | 0.02% | +18,777 | New |
| DekaBank Deutsche Girozentrale | 21,000 | $195.0K | 0.00% | 00.0% | Unchanged |
| Boothbay Fund Management, LLC | 22,764 | $215.0K | 0.01% | +6,693+41.6% | Added |
| Jasper Ridge Partners, L.P. | 23,100 | $218.0K | 0.01% | 00.0% | Unchanged |
| Prio Wealth Limited Partnership | 23,529 | $222.0K | 0.01% | 00.0% | Unchanged |
| Walleye Trading LLC | 23,650 | $223.0K | 0.01% | +8,450+55.6% | Added |
| ProShare Advisors LLC | 24,499 | $231.0K | 0.00% | −5,867−19.3% | Reduced |
| Legal & General Group Plc | 25,114 | $236.0K | 0.00% | +11,108+79.3% | Added |
| Principal Financial Group Inc | 26,013 | $245.0K | 0.00% | −27−0.1% | Reduced |
| Voya Investment Management LLC | 26,438 | $249.0K | 0.00% | 00.0% | Unchanged |
| State Board of Administration of Florida Retirement System | 27,117 | $256.0K | 0.00% | 00.0% | Unchanged |
| PDT Partners, LLC | 30,495 | $288.0K | 0.02% | +30,495 | New |
| JPMorgan Chase & Co | 31,518 | $297.0K | 0.00% | +1,658+5.6% | Added |
| Invesco Ltd. | 32,211 | $303.0K | 0.00% | +5,166+19.1% | Added |
| Barclays PLC | 33,016 | $312.0K | 0.00% | −24,349−42.4% | Reduced |
| Parametric Portfolio Associates LLC | 33,572 | $317.0K | 0.00% | −2,414−6.7% | Reduced |
| SG Americas Securities, LLC | 36,713 | $346.0K | 0.00% | +36,713 | New |
| Manufacturers Life Insurance Company, The | 38,053 | $359.0K | 0.00% | −1,753−4.4% | Reduced |
| American International Group, Inc. | 39,172 | $369.0K | 0.00% | +584+1.5% | Added |
| UBS Asset Management Americas Inc | 43,419 | $409.4K | 0.00% | 00.0% | Unchanged |
| TD Asset Management Inc | 45,057 | $425.0K | 0.00% | −28,897−39.1% | Reduced |
| Jane Street Group, LLC | 45,632 | $430.0K | 0.00% | −6,740−12.9% | Reduced |
| Citadel Advisors LLC | 46,843 | $442.0K | 0.00% | −542,280−92.0% | Reduced |
| Teachers Retirement System of the State of Kentucky | 47,980 | $452.0K | 0.00% | +11,141+30.2% | Added |
| D. E. Shaw & Co., Inc. | 48,605 | $458.0K | 0.00% | +8,520+21.3% | Added |
| New York State Common Retirement Fund | 51,864 | $489.0K | 0.00% | −7,581−12.8% | Reduced |
| Credit Suisse AG | 52,096 | $492.0K | 0.00% | −2,061−3.8% | Reduced |
| Marshall Wace North America L.P. | 59,082 | $558.0K | 0.00% | +59,082 | New |
| QVT Financial LP | 62,657 | $591.0K | 0.05% | 00.0% | Unchanged |
| AlphaCentric Advisors LLC | 65,500 | $618.0K | 0.16% | +20,000+44.0% | Added |
| State of Wisconsin Investment Board | 71,600 | $675.0K | 0.00% | −8,100−10.2% | Reduced |
| BNP Paribas Arbitrage, SA | 71,780 | $676.9K | 0.00% | +69,280+2,771.2% | Added |
| Alliancebernstein L.P. | 72,000 | $679.0K | 0.00% | 00.0% | Unchanged |
| Bank of America Corp | 77,385 | $730.0K | 0.00% | +22,153+40.1% | Added |
| Rhumbline Advisers | 82,743 | $780.0K | 0.00% | +2,409+3.0% | Added |
| California State Teachers Retirement System | 83,710 | $789.0K | 0.00% | −11,207−11.8% | Reduced |
| UBS Group AG | 88,231 | $832.0K | 0.00% | +64,795+276.5% | Added |
| Susquehanna International Group, LLP | 93,741 | $884.0K | 0.00% | −16,861−15.2% | Reduced |
| Voloridge Investment Management, LLC | 96,451 | $910.0K | 0.01% | +96,451 | New |
| Millennium Management LLC | 103,737 | $978.0K | 0.00% | −222,406−68.2% | Reduced |
| Deutsche Bank AG | 104,207 | $982.0K | 0.00% | −92,119−46.9% | Reduced |
| Platinum Investment Management Ltd | 110,906 | $1.05M | 0.03% | 00.0% | Unchanged |
| Citigroup Inc | 113,351 | $1.07M | 0.00% | −72,113−38.9% | Reduced |
| Walleye Capital LLC | 119,302 | $1.13M | 0.03% | +80,487+207.4% | Added |
| Swiss National Bank | 122,996 | $1.16M | 0.00% | +2,200+1.8% | Added |
| DAFNA Capital Management LLC | 140,263 | $1.32M | 0.35% | +12,000+9.4% | Added |
| Macquarie Group Ltd | 156,764 | $1.48M | 0.00% | +5,266+3.5% | Added |
| Rafferty Asset Management, LLC | 162,036 | $1.53M | 0.01% | +44,558+37.9% | Added |
| Hudson Bay Capital Management LP | 175,000 | $1.65M | 0.02% | +105,000+150.0% | Added |
| Dimensional Fund Advisors LP | 187,516 | $1.77M | 0.00% | +11,512+6.5% | Added |
| First Manhattan Co | 218,070 | $2.06M | 0.01% | +218,070 | New |
| Allianz Asset Management GmbH | 232,457 | $2.19M | 0.00% | −50,993−18.0% | Reduced |
| FMR LLC | 238,034 | $2.25M | 0.00% | −141,995−37.4% | Reduced |
| Bank of New York Mellon Corp | 270,809 | $2.55M | 0.00% | +21,808+8.8% | Added |
| Nuveen Asset Management, LLC | 276,188 | $2.60M | 0.00% | +16,240+6.2% | Added |
| Two Sigma Investments, LP | 348,245 | $3.28M | 0.01% | −215,785−38.3% | Reduced |
| Marshall Wace, LLP | 384,736 | $3.63M | 0.02% | +364,891+1,838.7% | Added |
| Charles Schwab Investment Management Inc | 482,310 | $4.55M | 0.00% | +69,837+16.9% | Added |
| Two Sigma Advisers, LP | 630,000 | $5.94M | 0.02% | +62,400+11.0% | Added |
| Morgan Stanley | 667,889 | $6.30M | 0.00% | +541,712+429.3% | Added |
| Northern Trust Corp | 697,013 | $6.57M | 0.00% | +14,326+2.1% | Added |
| Rho Capital Partners Inc | 796,458 | $7.51M | 4.19% | 00.0% | Unchanged |
| Assenagon Asset Management S.A. | 903,866 | $8.52M | 0.04% | −137,076−13.2% | Reduced |
| Price T Rowe Associates Inc | 980,896 | $9.25M | 0.00% | −1,336,851−57.7% | Reduced |
| CIBC Asset Management Inc | 1,058,798 | $9.98M | 0.04% | +2920.0% | Added |
| Geode Capital Management, LLC | 1,064,335 | $10.0M | 0.00% | +12,416+1.2% | Added |
| Goldman Sachs Group Inc | 1,145,369 | $10.8M | 0.00% | +568,414+98.5% | Added |
| Artal Group S.A. | 1,200,000 | $11.3M | 0.28% | 00.0% | Unchanged |
| Alkeon Capital Management LLC | 1,799,838 | $17.0M | 0.06% | −6,429−0.4% | Reduced |
| Candriam Luxembourg S.C.A. | 2,022,895 | $19.1M | 0.13% | +50,000+2.5% | Added |
| Pictet Asset Management SA | 2,237,868 | $21.1M | 0.02% | +2,237,868 | New |