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 |
|---|---|---|---|---|---|
| BlackRock Inc. | 8,807,328 | $83.1M | 0.00% | −15,376−0.2% | Reduced |
| Avoro Capital Advisors LLC | 6,800,000 | $64.1M | 1.01% | 00.0% | Unchanged |
| Wellington Management Group LLP | 6,007,375 | $56.6M | 0.01% | −869,961−12.6% | Reduced |
| Sarissa Capital Management LP | 4,299,297 | $40.5M | 3.18% | +293,697+7.3% | Added |
| Bellevue Group AG | 4,261,000 | $40.2M | 0.41% | +1,320,000+44.9% | Added |
| State Street Corp | 4,090,196 | $38.6M | 0.00% | +843,673+26.0% | Added |
| Bain Capital Life Sciences Investors, LLC | 3,695,667 | $34.9M | 2.16% | 00.0% | Unchanged |
| Vanguard Group Inc | 3,681,594 | $34.7M | 0.00% | +500,009+15.7% | Added |
| Rock Springs Capital Management LP | 3,020,702 | $28.5M | 0.60% | +175,084+6.2% | Added |
| OrbiMed Advisors LLC | 2,888,847 | $27.2M | 0.30% | +88,600+3.2% | Added |
| Pictet Asset Management SA | 2,237,868 | $21.1M | 0.02% | +2,237,868 | New |
| Candriam Luxembourg S.C.A. | 2,022,895 | $19.1M | 0.13% | +50,000+2.5% | Added |
| Alkeon Capital Management LLC | 1,799,838 | $17.0M | 0.06% | −6,429−0.4% | Reduced |
| Artal Group S.A. | 1,200,000 | $11.3M | 0.28% | 00.0% | Unchanged |
| Goldman Sachs Group Inc | 1,145,369 | $10.8M | 0.00% | +568,414+98.5% | Added |
| Geode Capital Management, LLC | 1,064,335 | $10.0M | 0.00% | +12,416+1.2% | Added |
| CIBC Asset Management Inc | 1,058,798 | $9.98M | 0.04% | +2920.0% | Added |
| Price T Rowe Associates Inc | 980,896 | $9.25M | 0.00% | −1,336,851−57.7% | Reduced |
| Assenagon Asset Management S.A. | 903,866 | $8.52M | 0.04% | −137,076−13.2% | Reduced |
| Rho Capital Partners Inc | 796,458 | $7.51M | 4.19% | 00.0% | Unchanged |
| Northern Trust Corp | 697,013 | $6.57M | 0.00% | +14,326+2.1% | Added |
| Morgan Stanley | 667,889 | $6.30M | 0.00% | +541,712+429.3% | Added |
| Two Sigma Advisers, LP | 630,000 | $5.94M | 0.02% | +62,400+11.0% | Added |
| Charles Schwab Investment Management Inc | 482,310 | $4.55M | 0.00% | +69,837+16.9% | Added |
| Marshall Wace, LLP | 384,736 | $3.63M | 0.02% | +364,891+1,838.7% | Added |
| Two Sigma Investments, LP | 348,245 | $3.28M | 0.01% | −215,785−38.3% | Reduced |
| Nuveen Asset Management, LLC | 276,188 | $2.60M | 0.00% | +16,240+6.2% | Added |
| Bank of New York Mellon Corp | 270,809 | $2.55M | 0.00% | +21,808+8.8% | Added |
| FMR LLC | 238,034 | $2.25M | 0.00% | −141,995−37.4% | Reduced |
| Allianz Asset Management GmbH | 232,457 | $2.19M | 0.00% | −50,993−18.0% | Reduced |
| First Manhattan Co | 218,070 | $2.06M | 0.01% | +218,070 | New |
| Dimensional Fund Advisors LP | 187,516 | $1.77M | 0.00% | +11,512+6.5% | Added |
| Hudson Bay Capital Management LP | 175,000 | $1.65M | 0.02% | +105,000+150.0% | Added |
| Rafferty Asset Management, LLC | 162,036 | $1.53M | 0.01% | +44,558+37.9% | Added |
| Macquarie Group Ltd | 156,764 | $1.48M | 0.00% | +5,266+3.5% | Added |
| DAFNA Capital Management LLC | 140,263 | $1.32M | 0.35% | +12,000+9.4% | Added |
| Swiss National Bank | 122,996 | $1.16M | 0.00% | +2,200+1.8% | Added |
| Walleye Capital LLC | 119,302 | $1.13M | 0.03% | +80,487+207.4% | Added |
| Citigroup Inc | 113,351 | $1.07M | 0.00% | −72,113−38.9% | Reduced |
| Platinum Investment Management Ltd | 110,906 | $1.05M | 0.03% | 00.0% | Unchanged |
| Deutsche Bank AG | 104,207 | $982.0K | 0.00% | −92,119−46.9% | Reduced |
| Millennium Management LLC | 103,737 | $978.0K | 0.00% | −222,406−68.2% | Reduced |
| Voloridge Investment Management, LLC | 96,451 | $910.0K | 0.01% | +96,451 | New |
| Susquehanna International Group, LLP | 93,741 | $884.0K | 0.00% | −16,861−15.2% | Reduced |
| UBS Group AG | 88,231 | $832.0K | 0.00% | +64,795+276.5% | Added |
| California State Teachers Retirement System | 83,710 | $789.0K | 0.00% | −11,207−11.8% | Reduced |
| Rhumbline Advisers | 82,743 | $780.0K | 0.00% | +2,409+3.0% | Added |
| Bank of America Corp | 77,385 | $730.0K | 0.00% | +22,153+40.1% | Added |
| Alliancebernstein L.P. | 72,000 | $679.0K | 0.00% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 71,780 | $676.9K | 0.00% | +69,280+2,771.2% | Added |
| State of Wisconsin Investment Board | 71,600 | $675.0K | 0.00% | −8,100−10.2% | Reduced |
| AlphaCentric Advisors LLC | 65,500 | $618.0K | 0.16% | +20,000+44.0% | Added |
| QVT Financial LP | 62,657 | $591.0K | 0.05% | 00.0% | Unchanged |
| Marshall Wace North America L.P. | 59,082 | $558.0K | 0.00% | +59,082 | New |
| Credit Suisse AG | 52,096 | $492.0K | 0.00% | −2,061−3.8% | Reduced |
| New York State Common Retirement Fund | 51,864 | $489.0K | 0.00% | −7,581−12.8% | Reduced |
| D. E. Shaw & Co., Inc. | 48,605 | $458.0K | 0.00% | +8,520+21.3% | Added |
| Teachers Retirement System of the State of Kentucky | 47,980 | $452.0K | 0.00% | +11,141+30.2% | Added |
| Citadel Advisors LLC | 46,843 | $442.0K | 0.00% | −542,280−92.0% | Reduced |
| Jane Street Group, LLC | 45,632 | $430.0K | 0.00% | −6,740−12.9% | Reduced |
| TD Asset Management Inc | 45,057 | $425.0K | 0.00% | −28,897−39.1% | Reduced |
| UBS Asset Management Americas Inc | 43,419 | $409.4K | 0.00% | 00.0% | Unchanged |
| American International Group, Inc. | 39,172 | $369.0K | 0.00% | +584+1.5% | Added |
| Manufacturers Life Insurance Company, The | 38,053 | $359.0K | 0.00% | −1,753−4.4% | Reduced |
| SG Americas Securities, LLC | 36,713 | $346.0K | 0.00% | +36,713 | New |
| Parametric Portfolio Associates LLC | 33,572 | $317.0K | 0.00% | −2,414−6.7% | Reduced |
| Barclays PLC | 33,016 | $312.0K | 0.00% | −24,349−42.4% | Reduced |
| Invesco Ltd. | 32,211 | $303.0K | 0.00% | +5,166+19.1% | Added |
| JPMorgan Chase & Co | 31,518 | $297.0K | 0.00% | +1,658+5.6% | Added |
| PDT Partners, LLC | 30,495 | $288.0K | 0.02% | +30,495 | New |
| State Board of Administration of Florida Retirement System | 27,117 | $256.0K | 0.00% | 00.0% | Unchanged |
| Voya Investment Management LLC | 26,438 | $249.0K | 0.00% | 00.0% | Unchanged |
| Principal Financial Group Inc | 26,013 | $245.0K | 0.00% | −27−0.1% | Reduced |
| Legal & General Group Plc | 25,114 | $236.0K | 0.00% | +11,108+79.3% | Added |
| ProShare Advisors LLC | 24,499 | $231.0K | 0.00% | −5,867−19.3% | Reduced |
| Walleye Trading LLC | 23,650 | $223.0K | 0.01% | +8,450+55.6% | Added |
| Prio Wealth Limited Partnership | 23,529 | $222.0K | 0.01% | 00.0% | Unchanged |
| Jasper Ridge Partners, L.P. | 23,100 | $218.0K | 0.01% | 00.0% | Unchanged |
| Boothbay Fund Management, LLC | 22,764 | $215.0K | 0.01% | +6,693+41.6% | Added |
| DekaBank Deutsche Girozentrale | 21,000 | $195.0K | 0.00% | 00.0% | Unchanged |
| Virtu Financial LLC | 18,777 | $177.0K | 0.02% | +18,777 | New |
| Algert Global LLC | 17,892 | $169.0K | 0.02% | +17,892 | New |
| MetLife Investment Management | 17,368 | $163.8K | 0.00% | −8,457−32.7% | Reduced |
| Truist Financial Corp | 16,700 | $157.0K | 0.00% | 00.0% | Unchanged |
| Arizona State Retirement System | 15,158 | $143.0K | 0.00% | +262+1.8% | Added |
| Metropolitan Life Insurance Co | 14,952 | $141.0K | 0.00% | −4,820−24.4% | Reduced |
| Virtus ETF Advisers LLC | 14,165 | $134.0K | 0.06% | −747−5.0% | Reduced |
| Allstate Corp | 13,667 | $129.0K | 0.01% | −329−2.4% | Reduced |
| AQR Capital Management LLC | 12,330 | $116.0K | 0.00% | 00.0% | Unchanged |
| Amalgamated Bank | 11,850 | $112.0K | 0.00% | −171−1.4% | Reduced |
| Fox Run Management, L.L.C. | 11,779 | $111.0K | 0.07% | +11,779 | New |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 10,092 | $95.0K | 0.00% | +11+0.1% | Added |
| Tower Research Capital LLC (TRC) | 8,693 | $82.0K | 0.00% | +2,868+49.2% | Added |
| Royal Bank of Canada | 6,941 | $66.0K | 0.00% | +2,226+47.2% | Added |
| First Mercantile Trust Co | 5,541 | $52.0K | 0.01% | −225−3.9% | Reduced |
| Ameritas Investment Partners, Inc. | 5,400 | $51.0K | 0.00% | 00.0% | Unchanged |
| Wells Fargo & Company | 5,360 | $50.0K | 0.00% | +5,308+10,207.7% | Added |
| Group One Trading, L.P. | 3,849 | $36.0K | 0.00% | +3,849 | New |
| Great West Life Assurance Co | 3,638 | $34.0K | 0.00% | 00.0% | Unchanged |
| Penserra Capital Management LLC | 1,640 | $15.0K | 0.00% | +55+3.5% | Added |