13 insiders reported 22 Form 4 transactions for Mersana Therapeutics, Inc. (MRSN) over the past 18 months (most recent 2026-01-06). Recent activity: Protopapas Anna (Director) Sell 6,721 shares, Protopapas Anna (Director) Sell 2,890 shares, Protopapas Anna (Director) Sell 9,609 shares, Mandelia Ashish (VP, Chief Accounting Officer) Sell 2,300 shares, Hege Kristen (Director) Sell 578 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-01-06 | Protopapas Anna | Director | Sell | 6,721 | $0 |
| 2026-01-06 | Protopapas Anna | Director | Sell | 2,890 | $0 |
| 2026-01-06 | Protopapas Anna | Director | Sell | 9,609 | $0 |
| 2026-01-06 | Mandelia Ashish | VP, Chief Accounting Officer | Sell | 2,300 | $0 |
| 2026-01-06 | Hege Kristen | Director | Sell | 578 | $0 |
| 2026-01-06 | MOTT DAVID M | Director | Sell | 23,546 | $0 |
| 2026-01-06 | MOTT DAVID M | Director | Sell | 383 | $0 |
| 2026-01-06 | Huber Martin H. Jr. | President, CEO | Sell | 9,573 | $0 |
| 2026-01-06 | Hack Andrew A. F. | Director | Sell | 578 | $0 |
| 2026-01-06 | Hack Andrew A. F. | Director | Sell | 346,545 | $0 |
| 2026-01-06 | Carvajal Alejandra | SVP, Chief Legal Officer | Sell | 3,131 | $0 |
| 2026-01-06 | Lowinger Timothy B | SVP, Chief Sci.&Tech. Officer | Sell | 10,466 | $0 |
| 2026-01-06 | Bala Mohan | SVP, Chief Development | Sell | 2,927 | $0 |
| 2026-01-06 | Dere Willard H | Director | Sell | 1,567 | $0 |
| 2026-01-06 | Diaz Allene M. | Director | Sell | 578 | $0 |
| 2026-01-06 | DeSchuytner Brian | SVP, COO & CFO | Sell | 5,015 | $0 |
| 2026-01-06 | Alleva Lawrence M | Director | Sell | 578 | $0 |
| 2026-01-06 | Alleva Lawrence M | Director | Sell | 84 | $0 |
| 2025-10-28 | Bala Mohan | SVP, Chief Development Officer | Buy | 250 | $0 |
| 2025-10-28 | Bala Mohan | SVP, Chief Development Officer | Sell | 77 | $762 |
| 2025-09-15 | Huber Martin H. Jr. | President, CEO | Buy | 6,670 | $0 |
| 2025-09-15 | Huber Martin H. Jr. | President, CEO | Sell | 2,012 | $14,708 |
Source: SEC Form 4 filings · as of 2026-01-06