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, Q2 2021
Institutional positions in Mersana Therapeutics, Inc. as of Jun 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
- 131
- −1 vs. Q1 2021
- Shares held
- 70.6M
- +496.4K (+0.7%) vs. Q1 2021
- Total value
- $957.8M
- −$186.5M (−16.3%) vs. Q1 2021
- New holders
- 18
- 51 more added
- Sold out
- 19
- 40 more reduced
Compare with Q1 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, Q2 2021
Shares, value and share of portfolio for each institution holding Mersana Therapeutics, Inc.; share changes are against Q1 2021.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock Inc. | 8,822,704 | $119.8M | 0.00% | +820,618+10.3% | Added |
| Wellington Management Group LLP | 6,877,336 | $93.4M | 0.02% | +699,543+11.3% | Added |
| Avoro Capital Advisors LLC | 6,800,000 | $92.3M | 1.61% | 00.0% | Unchanged |
| Sarissa Capital Management LP | 4,005,600 | $54.4M | 4.33% | 00.0% | Unchanged |
| Bain Capital Life Sciences Investors, LLC | 3,695,667 | $50.2M | 3.29% | 00.0% | Unchanged |
| State Street Corp | 3,246,523 | $44.1M | 0.00% | −499,477−13.3% | Reduced |
| Vanguard Group Inc | 3,181,585 | $43.2M | 0.00% | +64,216+2.1% | Added |
| Bellevue Group AG | 2,941,000 | $39.9M | 0.39% | +90,990+3.2% | Added |
| Rock Springs Capital Management LP | 2,845,618 | $38.6M | 0.77% | +70,491+2.5% | Added |
| OrbiMed Advisors LLC | 2,800,247 | $38.0M | 0.39% | +907,747+48.0% | Added |
| Price T Rowe Associates Inc | 2,317,747 | $31.5M | 0.00% | −656,340−22.1% | Reduced |
| Westfield Capital Management Co LP | 2,108,810 | $28.6M | 0.17% | +110,172+5.5% | Added |
| Candriam Luxembourg S.C.A. | 1,972,895 | $26.8M | 0.18% | +850,722+75.8% | Added |
| Alkeon Capital Management LLC | 1,806,267 | $24.5M | 0.09% | −4,238−0.2% | Reduced |
| Pictet Asset Management Ltd | 1,712,147 | $23.3M | 0.03% | +8,248+0.5% | Added |
| Artal Group S.A. | 1,200,000 | $16.3M | 0.37% | 00.0% | Unchanged |
| CIBC Asset Management Inc | 1,058,506 | $14.4M | 0.06% | +730,887+223.1% | Added |
| Geode Capital Management, LLC | 1,051,919 | $14.3M | 0.00% | +93,868+9.8% | Added |
| Assenagon Asset Management S.A. | 1,040,942 | $14.1M | 0.06% | +1,040,942 | New |
| Rho Capital Partners Inc | 796,458 | $10.8M | 0.99% | 00.0% | Unchanged |
| Northern Trust Corp | 682,687 | $9.27M | 0.00% | +89,467+15.1% | Added |
| Citadel Advisors LLC | 589,123 | $8.00M | 0.01% | +50,716+9.4% | Added |
| Goldman Sachs Group Inc | 576,955 | $7.83M | 0.00% | −580,435−50.2% | Reduced |
| Two Sigma Advisers, LP | 567,600 | $7.71M | 0.02% | −19,100−3.3% | Reduced |
| Two Sigma Investments, LP | 564,030 | $7.66M | 0.02% | +178,460+46.3% | Added |
| Ghost Tree Capital, LLC | 450,000 | $6.11M | 1.91% | 00.0% | Unchanged |
| Commodore Capital LP | 429,228 | $5.83M | 2.03% | 00.0% | Unchanged |
| Charles Schwab Investment Management Inc | 412,473 | $5.60M | 0.00% | +42,290+11.4% | Added |
| FMR LLC | 380,029 | $5.16M | 0.00% | −348,900−47.9% | Reduced |
| Millennium Management LLC | 326,143 | $4.43M | 0.01% | +38,472+13.4% | Added |
| Allianz Asset Management GmbH | 283,450 | $3.85M | 0.00% | +1,467+0.5% | Added |
| Nuveen Asset Management, LLC | 259,948 | $3.53M | 0.00% | +17,519+7.2% | Added |
| Bank of New York Mellon Corp | 249,001 | $3.38M | 0.00% | −12,510−4.8% | Reduced |
| Deutsche Bank AG | 196,326 | $2.67M | 0.00% | −23,072−10.5% | Reduced |
| Citigroup Inc | 185,464 | $2.52M | 0.00% | −44,637−19.4% | Reduced |
| Dimensional Fund Advisors LP | 176,004 | $2.39M | 0.00% | −2,839−1.6% | Reduced |
| Sio Capital Management, LLC | 157,259 | $2.14M | 0.58% | 00.0% | Unchanged |
| STRS Ohio | 153,742 | $2.09M | 0.01% | 00.0% | Unchanged |
| Macquarie Group Ltd | 151,498 | $2.06M | 0.00% | 00.0% | Unchanged |
| DAFNA Capital Management LLC | 128,263 | $1.74M | 0.36% | +4,000+3.2% | Added |
| Morgan Stanley | 126,177 | $1.71M | 0.00% | +112,940+853.2% | Added |
| Silverarc Capital Management, LLC | 125,123 | $1.70M | 0.89% | +100,123+400.5% | Added |
| Swiss National Bank | 120,796 | $1.64M | 0.00% | −4,500−3.6% | Reduced |
| Comerica Bank | 147,312 | $1.61M | 0.01% | +54,066+58.0% | Added |
| Rafferty Asset Management, LLC | 117,478 | $1.59M | 0.01% | −67,630−36.5% | Reduced |
| Bailard, Inc. | 111,000 | $1.51M | 0.05% | −20,000−15.3% | Reduced |
| Platinum Investment Management Ltd | 110,906 | $1.51M | 0.03% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 110,602 | $1.50M | 0.00% | −20,777−15.8% | Reduced |
| California State Teachers Retirement System | 94,917 | $1.29M | 0.00% | +14,647+18.2% | Added |
| Maven Securities LTD | 84,469 | $1.17M | 0.12% | +84,469 | New |
| Affinity Asset Advisors, LLC | 85,000 | $1.15M | 0.55% | 00.0% | Unchanged |
| Rhumbline Advisers | 80,334 | $1.09M | 0.00% | +12,462+18.4% | Added |
| State of Wisconsin Investment Board | 79,700 | $1.08M | 0.00% | −11,300−12.4% | Reduced |
| Alliancebernstein L.P. | 72,000 | $978.0K | 0.00% | 00.0% | Unchanged |
| Hudson Bay Capital Management LP | 70,000 | $951.0K | 0.01% | +70,000 | New |
| QVT Financial LP | 62,657 | $851.0K | 0.06% | 00.0% | Unchanged |
| Qube Research & Technologies Ltd | 62,685 | $851.0K | 0.01% | +62,685 | New |
| HighVista Strategies LLC | 59,906 | $814.0K | 0.58% | +59,906 | New |
| TD Asset Management Inc | 73,954 | $813.0K | 0.00% | −13,403−15.3% | Reduced |
| New York State Common Retirement Fund | 59,445 | $807.0K | 0.00% | +11,145+23.1% | Added |
| Barclays PLC | 57,365 | $778.0K | 0.00% | −68,063−54.3% | Reduced |
| Bank of America Corp | 55,232 | $750.0K | 0.00% | +21,841+65.4% | Added |
| Caption Management, LLC | 54,700 | $742.0K | 0.07% | −191,447−77.8% | Reduced |
| Credit Suisse AG | 54,157 | $736.0K | 0.00% | +715+1.3% | Added |
| Jane Street Group, LLC | 52,372 | $712.0K | 0.00% | −10,963−17.3% | Reduced |
| FIL Ltd | 52,415 | $712.0K | 0.00% | 00.0% | Unchanged |
| AlphaCentric Advisors LLC | 45,500 | $618.0K | 0.17% | +15,000+49.2% | Added |
| Engineers Gate Manager LP | 43,592 | $592.0K | 0.04% | +31,732+267.6% | Added |
| UBS Asset Management Americas Inc | 43,419 | $589.6K | 0.00% | +3,852+9.7% | Added |
| Squarepoint Ops LLC | 42,507 | $577.0K | 0.00% | −12,908−23.3% | Reduced |
| D. E. Shaw & Co., Inc. | 40,085 | $544.0K | 0.00% | −113,986−74.0% | Reduced |
| Manufacturers Life Insurance Company, The | 39,806 | $541.0K | 0.00% | +9,265+30.3% | Added |
| Walleye Capital LLC | 38,815 | $527.0K | 0.02% | +38,815 | New |
| American International Group, Inc. | 38,588 | $524.0K | 0.00% | +7,563+24.4% | Added |
| Teachers Retirement System of the State of Kentucky | 36,839 | $500.0K | 0.00% | 00.0% | Unchanged |
| Parametric Portfolio Associates LLC | 35,986 | $489.0K | 0.00% | −3,815−9.6% | Reduced |
| ProShare Advisors LLC | 30,366 | $412.0K | 0.00% | +6,587+27.7% | Added |
| Skandinaviska Enskilda Banken AB (publ) | 30,304 | $412.0K | 0.00% | +30,304 | New |
| JPMorgan Chase & Co | 29,860 | $405.0K | 0.00% | −112,314−79.0% | Reduced |
| Cowen and Company, LLC | 29,397 | $399.0K | 0.02% | +8,297+39.3% | Added |
| Invesco Ltd. | 27,045 | $368.0K | 0.00% | −385,125−93.4% | Reduced |
| State Board of Administration of Florida Retirement System | 27,117 | $368.0K | 0.00% | +4,757+21.3% | Added |
| Point72 Asset Management, L.P. | 26,900 | $365.0K | 0.00% | −1,016,200−97.4% | Reduced |
| Voya Investment Management LLC | 26,438 | $359.0K | 0.00% | +3,488+15.2% | Added |
| Principal Financial Group Inc | 26,040 | $353.0K | 0.00% | −55,116−67.9% | Reduced |
| MetLife Investment Management | 25,825 | $350.7K | 0.00% | +4,676+22.1% | Added |
| Prio Wealth Limited Partnership | 23,529 | $320.0K | 0.01% | 00.0% | Unchanged |
| UBS Group AG | 23,436 | $318.0K | 0.00% | −63,645−73.1% | Reduced |
| Jasper Ridge Partners, L.P. | 23,100 | $314.0K | 0.02% | 00.0% | Unchanged |
| Schonfeld Strategic Advisors LLC | 22,500 | $306.0K | 0.00% | −23,402−51.0% | Reduced |
| Twinbeech Capital LP | 21,570 | $293.0K | 0.04% | +21,570 | New |
| ExodusPoint Capital Management, LP | 21,147 | $287.0K | 0.00% | +21,147 | New |
| Cubist Systematic Strategies, LLC | 20,228 | $275.0K | 0.00% | +14,350+244.1% | Added |
| DekaBank Deutsche Girozentrale | 21,000 | $274.0K | 0.00% | 00.0% | Unchanged |
| Marshall Wace, LLP | 19,845 | $269.0K | 0.00% | −132,265−87.0% | Reduced |
| Dynamic Technology Lab Private Ltd | 19,821 | $269.0K | 0.03% | +19,821 | New |
| Metropolitan Life Insurance Co | 19,772 | $268.5K | 0.00% | +5,167+35.4% | Added |
| Truist Financial Corp | 16,700 | $227.0K | 0.00% | +5,000+42.7% | Added |
| Quantbot Technologies LP | 16,200 | $219.0K | 0.02% | +16,200 | New |
| Boothbay Fund Management, LLC | 16,071 | $218.0K | 0.01% | +16,071 | New |