MRSN — MERSANA THERAPEUTICS INC
Reported value held$38.86M
Funds holding (latest)39
Sector—
MRSN (MERSANA THERAPEUTICS INC) is tracked on HoldingsHub across five years of quarterly 13F filings. 39 funds have reported positions historically, with the sum of their latest reported stakes valued at $38.86M. No fund in our coverage reported a position in the latest filing period, which typically means the stock has fallen out of the tracked funds' portfolios rather than that it cannot be bought.
All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.
Q4 2025 — 14 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| Vanguard Group history | 210.30K | $6.08M | 0.00% | Reduce |
| BlackRock Inc history | 69.21K | $2.00M | 0.00% | Reduce |
| Bank of America Corp history | 65.75K | $1.90M | 0.00% | Reduce |
| Millennium Management history | 63.30K | $1.83M | 0.00% | Reduce |
| Geode Capital Management history | 43.92K | $1.27M | 0.00% | Add |
| AQR Capital Management history | 37.26K | $1.08M | 0.00% | Reduce |
| Citadel Advisors history | 22.49K | $650.72K | 0.00% | New |
| Morgan Stanley history | 18.50K | $535.09K | 0.00% | Reduce |
| Point72 Asset Management history | 10.36K | $299.83K | 0.00% | New |
| Northern Trust Corp history | 8.59K | $248.39K | 0.00% | New |
| UBS Group AG history | 221 | $6.39K | 0.00% | Reduce |
| JPMorgan Chase & Co history | 112 | $3.24K | 0.00% | Reduce |
| Wells Fargo & Co history | 40 | $1.16K | 0.00% | Reduce |
| Fidelity Management & Research (FMR) history | 8 | $231 | 0.00% | Reduce |
Q3 2025 — 14 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| Vanguard Group history | 302.55K | $2.35M | 0.00% | Reduce |
| BlackRock Inc history | 96.19K | $746.46K | 0.00% | Reduce |
| Renaissance Technologies history | 88.47K | $686.49K | 0.00% | Reduce |
| Millennium Management history | 77.99K | $605.20K | 0.00% | Reduce |
| Bank of America Corp history | 66.40K | $515.24K | 0.00% | Add |
| Morgan Stanley history | 48.33K | $375.02K | 0.00% | Reduce |
| AQR Capital Management history | 46.72K | $362.55K | 0.00% | Reduce |
| Geode Capital Management history | 41.65K | $323.29K | 0.00% | Reduce |
| Two Sigma Investments history | 30.69K | $238.14K | 0.00% | Reduce |
| UBS Group AG history | 8.61K | $66.81K | 0.00% | Reduce |
| JPMorgan Chase & Co history | 6.11K | $47.40K | 0.00% | Reduce |
| Fidelity Management & Research (FMR) history | 4.86K | $37.74K | 0.00% | Reduce |
| Wells Fargo & Co history | 1.24K | $9.62K | 0.00% | Reduce |
| Citigroup Inc history | 106 | $823 | 0.00% | Reduce |
Q2 2025 — 22 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| Vanguard Group history | 7.68M | $2.27M | 0.00% | Reduce |
| AQR Capital Management history | 5.13M | $1.52M | 0.00% | Hold |
| BlackRock Inc history | 3.76M | $1.11M | 0.00% | Reduce |
| Renaissance Technologies history | 2.85M | $843.66K | 0.00% | Add |
| Millennium Management history | 2.09M | $618.71K | 0.00% | New |
| Goldman Sachs Group history | 1.43M | $424.39K | 0.00% | Add |
| Geode Capital Management history | 1.05M | $310.66K | 0.00% | Reduce |
| Two Sigma Investments history | 823.27K | $243.69K | 0.00% | Add |
| UBS Group AG history | 775.50K | $229.55K | 0.00% | Add |
| Morgan Stanley history | 357.60K | $105.85K | 0.00% | Add |
| Deutsche Bank AG history | 305.07K | $91.52K | 0.00% | Reduce |
| Marshall Wace history | 226.97K | $68.09K | 0.00% | New |
| Northern Trust Corp history | 222.69K | $65.92K | 0.00% | Reduce |
| Fidelity Management & Research (FMR) history | 138.52K | $41.00K | 0.00% | Reduce |
| JPMorgan Chase & Co history | 130.09K | $38.51K | 0.00% | Add |
| Citigroup Inc history | 73.00K | $21.61K | 0.00% | Reduce |
| BNY Mellon history | 66.58K | $19.71K | 0.00% | Reduce |
| Citadel Advisors history | 48.30K | $14.30K | 0.00% | Add |
| Wells Fargo & Co history | 23.01K | $6.81K | 0.00% | Reduce |
| Bank of America Corp history | 20.08K | $5.95K | 0.00% | Reduce |
| Prudential Financial history | 14.90K | $4.40K | 0.00% | Reduce |
| PNC Financial Services history | 893 | $264 | 0.00% | Reduce |
Q1 2025 — 26 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| Vanguard Group history | 8.38M | $2.88M | 0.00% | Add |
| BlackRock Inc history | 8.33M | $2.87M | 0.00% | Reduce |
| AQR Capital Management history | 5.14M | $1.77M | 0.00% | New |
| Geode Capital Management history | 2.44M | $840.78K | 0.00% | Hold |
| Northern Trust Corp history | 864.79K | $297.66K | 0.00% | Reduce |
| Renaissance Technologies history | 839.92K | $289.10K | 0.00% | Add |
| Deutsche Bank AG history | 839.72K | $285.51K | 0.00% | Hold |
| Goldman Sachs Group history | 586.66K | $201.93K | 0.00% | Reduce |
| BNY Mellon history | 346.19K | $119.16K | 0.00% | Hold |
| UBS Group AG history | 319.81K | $110.01K | 0.00% | Add |
| Bank of America Corp history | 314.37K | $108.14K | 0.00% | Reduce |
| Morgan Stanley history | 307.13K | $105.72K | 0.00% | Reduce |
| Charles Schwab Investment Management history | 280.63K | $96.59K | 0.00% | Reduce |
| Fidelity Management & Research (FMR) history | 171.08K | $58.89K | 0.00% | Reduce |
| Invesco Ltd history | 114.86K | $39.54K | 0.00% | Add |
| Citigroup Inc history | 81.62K | $28.10K | 0.00% | Reduce |
| Wells Fargo & Co history | 78.49K | $27.02K | 0.00% | Add |
| Prudential Financial history | 61.53K | $21.18K | 0.00% | New |
| Two Sigma Investments history | 53.65K | $18.47K | 0.00% | Reduce |
| JPMorgan Chase & Co history | 50.70K | $17.45K | 0.00% | Reduce |
| Citadel Advisors history | 29.30K | $10.09K | 0.00% | Reduce |
| Manulife Financial history | 17.37K | $5.98K | 0.00% | Reduce |
| Legal & General Investment Management America history | 11.10K | $3.82K | 0.00% | Hold |
| Principal Global Investors history | 10.35K | $3.56K | 0.00% | New |
| PNC Financial Services history | 3.54K | $1.22K | 0.00% | Add |
| T. Rowe Price Associates history | 62.09K | $22 | 0.00% | Hold |
Q4 2024 — 28 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| BlackRock Inc history | 9.21M | $13.16M | 0.00% | Add |
| Vanguard Group history | 7.06M | $10.09M | 0.00% | Reduce |
| JPMorgan Chase & Co history | 2.53M | $3.62M | 0.00% | Add |
| Geode Capital Management history | 2.44M | $3.49M | 0.00% | Add |
| Morgan Stanley history | 1.20M | $1.72M | 0.00% | Reduce |
| Bank of America Corp history | 953.95K | $1.36M | 0.00% | Reduce |
| Northern Trust Corp history | 929.71K | $1.33M | 0.00% | Hold |
| Deutsche Bank AG history | 839.72K | $1.20M | 0.00% | Reduce |
| Goldman Sachs Group history | 802.37K | $1.15M | 0.00% | Reduce |
| Millennium Management history | 795.97K | $1.14M | 0.00% | Add |
| Renaissance Technologies history | 606.28K | $866.99K | 0.00% | Add |
| Wellington Management Group history | 576.15K | $823.89K | 0.00% | Reduce |
| D. E. Shaw & Co history | 544.46K | $778.58K | 0.00% | Reduce |
| Citadel Advisors history | 476.96K | $682.05K | 0.00% | Reduce |
| BNY Mellon history | 346.19K | $495.05K | 0.00% | Reduce |
| Charles Schwab Investment Management history | 312.62K | $447.05K | 0.00% | Hold |
| Fidelity Management & Research (FMR) history | 299.32K | $428.03K | 0.00% | Add |
| Two Sigma Investments history | 210.88K | $301.55K | 0.00% | Reduce |
| UBS Group AG history | 162.26K | $232.04K | 0.00% | Reduce |
| Citigroup Inc history | 97.83K | $139.90K | 0.00% | Add |
| Wells Fargo & Co history | 67.48K | $96.50K | 0.00% | Add |
| Invesco Ltd history | 54.87K | $78.47K | 0.00% | Reduce |
| Manulife Financial history | 43.99K | $62.91K | 0.00% | Reduce |
| Marshall Wace history | 15.60K | $22.31K | 0.00% | New |
| Legal & General Investment Management America history | 11.10K | $15.87K | 0.00% | Hold |
| PNC Financial Services history | 200 | $286 | 0.00% | Hold |
| T. Rowe Price Associates history | 62.09K | $89 | 0.00% | Reduce |
| Lazard Asset Management history | 12.10K | $17 | 0.00% | New |
Q3 2024 — 27 funds
| Fund | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|
| BlackRock Inc history | 8.62M | $16.30M | 0.00% | New |
| Vanguard Group history | 7.18M | $13.57M | 0.00% | Add |
| Citadel Advisors history | 4.47M | $8.44M | 0.00% | Add |
| Geode Capital Management history | 2.41M | $4.56M | 0.00% | Reduce |
| JPMorgan Chase & Co history | 2.35M | $4.44M | 0.00% | Add |
| Goldman Sachs Group history | 1.96M | $3.70M | 0.00% | Add |
| Deutsche Bank AG history | 1.60M | $3.02M | 0.00% | Add |
| Morgan Stanley history | 1.36M | $2.58M | 0.00% | Reduce |
| D. E. Shaw & Co history | 1.02M | $1.93M | 0.00% | Reduce |
| Bank of America Corp history | 990.04K | $1.87M | 0.00% | Add |
| Northern Trust Corp history | 933.49K | $1.76M | 0.00% | Add |
| Wellington Management Group history | 618.30K | $1.17M | 0.00% | Add |
| Balyasny Asset Management history | 535.82K | $1.01M | 0.00% | New |
| Renaissance Technologies history | 492.72K | $931.24K | 0.00% | Reduce |
| UBS Group AG history | 473.53K | $894.97K | 0.00% | Add |
| BNY Mellon history | 372.17K | $703.41K | 0.00% | Reduce |
| Charles Schwab Investment Management history | 312.62K | $590.86K | 0.00% | Hold |
| Two Sigma Investments history | 300.22K | $567.42K | 0.00% | Reduce |
| Fidelity Management & Research (FMR) history | 277.74K | $524.93K | 0.00% | Add |
| Millennium Management history | 259.78K | $490.99K | 0.00% | Reduce |
| Citigroup Inc history | 82.31K | $155.57K | 0.00% | Add |
| Invesco Ltd history | 55.48K | $104.86K | 0.00% | Add |
| Wells Fargo & Co history | 48.12K | $90.94K | 0.00% | Add |
| Manulife Financial history | 44.47K | $84.05K | 0.00% | Reduce |
| Legal & General Investment Management America history | 11.10K | $20.97K | 0.00% | Hold |
| PNC Financial Services history | 200 | $378 | 0.00% | Hold |
| T. Rowe Price Associates history | 99.08K | $188 | 0.00% | Hold |
New Positions (latest)
No fund opened a new position this quarter.
Fully Exited (vs previous quarter)
No tracked fund fully exited this quarter.
Fund Position History — shares by quarter (top 20 funds)
| Fund | Q4 2025 | Q3 2025 | Q2 2025 | Q1 2025 | Q4 2024 | Q3 2024 | Q2 2024 | Q1 2024 | Q4 2023 | Q3 2023 | Q2 2023 | Q1 2023 | Q4 2022 | Q3 2022 | Q2 2022 | Q1 2022 | Q4 2021 | Q3 2021 | Q2 2021 | Q1 2021 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Vanguard Group | 210.30K | 302.55K | 7.68M | 8.38M | 7.06M | 7.18M | 6.70M | 6.27M | 6.24M | 6.19M | 5.72M | 4.64M | 4.45M | 4.38M | 4.73M | 3.44M | 3.61M | 3.68M | 3.18M | 3.12M |
| BlackRock Inc | 69.21K | 96.19K | 3.76M | 8.33M | 9.21M | 8.62M | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Bank of America Corp | 65.75K | 66.40K | 20.08K | 314.37K | 953.95K | 990.04K | 159.77K | 209.56K | 162.06K | 117.37K | 301.49K | 1.02M | 760.72K | 397.65K | 56.78K | 34.51K | 42.85K | 77.39K | — | — |
| Millennium Management | 63.30K | 77.99K | 2.09M | — | 795.97K | 259.78K | 691.78K | 1.51M | 3.39M | 2.18M | 2.12M | 1.26M | 3.66M | 3.78M | 4.38M | 4.88M | 636.08K | 103.74K | — | — |
| Geode Capital Management | 43.92K | 41.65K | 1.05M | 2.44M | 2.44M | 2.41M | 2.49M | 2.36M | 2.30M | 2.16M | 2.01M | 1.80M | 1.71M | 1.65M | 1.57M | 1.17M | 1.14M | 1.06M | — | — |
| AQR Capital Management | 37.26K | 46.72K | 5.13M | 5.14M | — | — | — | — | 31.56K | 143.17K | 72.04K | 33.90K | 135.20K | 90.41K | 23.40K | 12.71K | — | 12.33K | — | — |
| Citadel Advisors | 22.49K | — | 48.30K | 29.30K | 476.96K | 4.47M | 2.79M | 3.48M | 1.98M | 1.77M | 267.38K | 128.36K | 629.58K | 176.90K | 364.51K | 713.49K | 354.11K | 112.04K | — | — |
| Morgan Stanley | 18.50K | 48.33K | 357.60K | 307.13K | 1.20M | 1.36M | 2.27M | 2.94M | 4.13M | 986.02K | 764.51K | 1.90M | 1.76M | 1.59M | 1.57M | 2.17M | 1.23M | 667.89K | — | — |
| Point72 Asset Management | 10.36K | — | — | — | — | — | — | — | — | 17.04K | 3.48K | — | — | — | — | — | 818.10K | — | — | — |
| Northern Trust Corp | 8.59K | — | 222.69K | 864.79K | 929.71K | 933.49K | 900.62K | 945.17K | 931.41K | 1.03M | 1.10M | 884.63K | 904.38K | 872.22K | 856.49K | 724.25K | 747.88K | 697.01K | — | — |
| UBS Group AG | 221 | 8.61K | 775.50K | 319.81K | 162.26K | 473.53K | 34.98K | 289.67K | 153.28K | 56.94K | 173.62K | 185.40K | 288.60K | 26.30K | 8.83K | 15.12K | 181.16K | 88.23K | — | — |
| JPMorgan Chase & Co | 112 | 6.11K | 130.09K | 50.70K | 2.53M | 2.35M | 1.98M | 1.43M | 78.82K | 267.01K | 1.44M | 6.68K | 386.82K | 60.13K | 451.14K | 309.63K | 31.58K | 31.52K | — | — |
| Wells Fargo & Co | 40 | 1.24K | 23.01K | 78.49K | 67.48K | 48.12K | 47.27K | 37.62K | 30.83K | 23.02K | 102.90K | 97.28K | — | 1.56K | 1.14K | 17.73K | 41.74K | 5.36K | — | — |
| Fidelity Management & Research (FMR) | 8 | 4.86K | 138.52K | 171.08K | 299.32K | 277.74K | 245.41K | 325.60K | 535.63K | 579.79K | 1.48M | 123.81K | 123.38K | 215.72K | 123.38K | 126.70K | 121.69K | 238.03K | — | — |
| Renaissance Technologies | — | 88.47K | 2.85M | 839.92K | 606.28K | 492.72K | 1.45M | 1.43M | 865.73K | 925.92K | 1.05M | 1.25M | 571.72K | 698.82K | 570.32K | 919.20K | 342.60K | — | — | — |
| Two Sigma Investments | — | 30.69K | 823.27K | 53.65K | 210.88K | 300.22K | 748.69K | 217.94K | 171.34K | 149.07K | 267.27K | 204.58K | 617.83K | 682.08K | 451.17K | 1.28M | 877.75K | 348.25K | — | — |
| Citigroup Inc | — | 106 | 73.00K | 81.62K | 97.83K | 82.31K | 25.57K | 414.85K | 15.97K | 1.74K | 125.63K | 499.27K | 273.47K | 197.28K | 9.60K | 6.36K | 227.03K | 113.35K | — | — |
| Goldman Sachs Group | — | — | 1.43M | 586.66K | 802.37K | 1.96M | 1.24M | 672.61K | 145.56K | 337.05K | 1.40M | 2.94M | 2.01M | 2.40M | 1.86M | 1.65M | 1.21M | 1.15M | — | — |
| Deutsche Bank AG | — | — | 305.07K | 839.72K | 839.72K | 1.60M | 1.58M | 1.59M | 1.14M | 62.83K | 1.14M | 1.15M | 1.13M | 1.12M | 1.12M | 1.16M | 77.01K | 104.21K | — | — |
| CPP Investments | — | — | — | — | — | — | — | 204.90K | — | — | — | — | — | — | — | — | — | — | — | — |