Mersana Therapeutics Ownership | Who Owns Mersana Therapeutics?
Mersana Therapeutics Ownership Summary
Mersana Therapeutics is owned by 1.06% institutional investors, 1.47% insiders, and 97.47% retail investors. Nextech invest is the largest institutional shareholder, holding 9.83% of MRSN shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 2.78% of its assets in Mersana Therapeutics shares.
MRSN Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Mersana Therapeutics | 1.06% | 1.47% | 97.47% |
| Sector | Healthcare Stocks | 42.54% | 10.83% | 46.63% |
| Industry | Biotech Stocks | 45.22% | 10.75% | 44.04% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Nextech invest | 12.07M | 9.83% | $17.26M |
| Blackrock | 8.38M | 6.90% | $16.85M |
| Morgan stanley | 2.27M | 1.87% | $4.57M |
| Luminus management | 50.00K | 1.00% | $388.00K |
| Goldman sachs group | 802.37K | 0.65% | $1.15M |
| D. e. shaw | 544.46K | 0.44% | $778.58K |
| Clarivest asset management | 500.50K | 0.41% | $1.01M |
| Jacobs levy equity management | 485.59K | 0.40% | $976.04K |
| Bridgeway capital management | 475.50K | 0.39% | $955.75K |
| Nuveen asset management | 232.22K | 0.19% | $332.08K |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Nextech invest | 12.07M | 2.80% | $17.26M |
| Luminus management | 50.00K | 0.35% | $388.00K |
| Clarivest asset management | 500.50K | 0.10% | $1.01M |
| Bridgeway capital management | 475.50K | 0.02% | $955.75K |
| Jacobs levy equity management | 485.59K | 0.00% | $976.04K |
| Prio wealth limited partnership | 23.53K | 0.00% | $47.29K |
| D. e. shaw | 544.46K | 0.00% | $778.58K |
| Blackrock | 8.38M | 0.00% | $16.85M |
| Morgan stanley | 2.27M | 0.00% | $4.57M |
| Jasper ridge partners | 23.10K | 0.00% | $6.84K |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock | 8.38M | 0.00% | 288.18K |
| Bridgeway capital management | 475.50K | 0.02% | 243.20K |
| Nuveen asset management | 232.22K | 0.00% | 81.02K |
| Clarivest asset management | 500.50K | 0.10% | 28.65K |
| Public employees retirement system of ohio | 20.59K | 0.00% | 20.59K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Nextech invest | - | - | -12.07M |
| Ecor1 capital | - | - | -11.33M |
| Bain capital life sciences investors | - | - | -8.66M |
| Vanguard group | - | - | -7.68M |
| Schonfeld strategic advisors | - | - | -5.67M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Wolverine trading | 10.87K | - | 10.87K | $15.43K |
Sold Out
| Holder | Change |
|---|---|
| Farther finance advisors | -1.00 |
| Ifp advisors | -2.00 |
| Frazier financial advisors | -5.00 |
| Capital performance advisors llp | -11.00 |
| Nelson, van denburg & campbell wealth management group | -22.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Sep 30, 2025 | 4 | -94.81% | 52,898 | -99.92% | 1 | 0.03% | - | -100.00% | 4 | -86.21% |
| Jun 30, 2025 | 81 | -27.03% | 77,176,495 | -12.25% | 61 | 1.22% | 35 | -36.36% | 30 | -3.23% |
| Mar 31, 2025 | 7 | -94.85% | 17,769,330 | -82.96% | 14 | 0.20% | 3 | -95.16% | 1 | -97.50% |
| Dec 31, 2024 | 130 | 7.44% | 101,397,402 | -12.65% | 82 | 0.92% | 58 | 13.73% | 39 | 21.88% |
| Sep 30, 2024 | 121 | -3.20% | 116,077,343 | 1.64% | 94 | 1.07% | 52 | -17.46% | 32 | -11.11% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Vanguard US Total Market Shares ETF | 3.47M | 2.78% | - |
| Vanguard Total Stock Mkt Idx Inv | 135.87K | 2.72% | -2.97K |
| Vanguard Explorer Inv | 2.01M | 1.61% | - |
| Fidelity Small Cap Index | 1.11M | 0.89% | - |
| Vanguard Institutional Extnd Mkt Idx Tr | 41.90K | 0.84% | -19.09K |
| State St Russell Sm/Mid Cp® Indx NL Cl C | 839.38K | 0.67% | - |
| State St Russell Sm/Mid Cp® Indx SL Cl I | 839.38K | 0.67% | - |
| iShares Biotechnology ETF | 23.92K | 0.48% | - |
| iShares Russell 2000 ETF | 569.31K | 0.46% | - |
| Vanguard Russell 2000 ETF | 564.71K | 0.45% | 4.82K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Oct 27, 2025 | Bala Mohan | SVP, Chief Development Officer | Sell | $762.30 |
| Sep 12, 2025 | Huber Martin H. Jr. | President, CEO | Sell | $14.71K |
| Jan 16, 2025 | Mandelia Ashish | VP, Chief Accounting Officer | Sell | $2.06K |
| Jan 16, 2025 | Protopapas Anna | - | Sell | $5.01K |
| Jan 16, 2025 | Lowinger Timothy B | SVP, Chief Sci.&Tech. Officer | Sell | $4.67K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q4 | - | 1 |
| 2025 Q3 | - | 1 |
| 2025 Q2 | - | - |
| 2025 Q1 | - | 18 |
| 2024 Q4 | - | 11 |
MRSN Ownership FAQ
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