Martin H. Huber Jr. insider trades: Mersana Therapeutics (MRSN) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Martin reports to the SEC
Open-market buys and sales
13 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Sep 12, 2025 | MRSN | ↓ Sell | 2,012 | $7.31 | $15K | Direct | Sep 15, 2025 (3d) |
| May 19, 2025 | SNDX | ↑ Buy | 5,000 | $8.99 | $45K | Direct | May 19, 2025 (0d) |
| Jan 16, 2025 | MRSN | ↓ Sell | 4,514 | $0.58 | $3K | Direct | Jan 17, 2025 (1d) |
| Sep 12, 2024 | MRSN | ↓ Sell | 50,423 | $1.76 | $89K | Direct | Sep 13, 2024 (1d) |
| Sep 24, 2018 | TSRO | ↓ Sell | 371 | $37.63 | $14K | Direct | Sep 25, 2018 (1d) |
| Mar 2, 2018 | TSRO | ↓ Sell | 1,803 | $54.86 | $99K | Direct | Mar 5, 2018 (3d) |
| Dec 4, 2017 | TSRO | ↓ Sell | 829 | $85.24 | $71K | Direct | Dec 5, 2017 (1d) |
| Sep 22, 2017 | TSRO | ↓ Sell | 592 | $118.60 | $70K | Direct | Sep 25, 2017 (3d) |
| Apr 3, 2017 | TSRO | ↓ Sell | 829 | $153.02 | $127K | Direct | Apr 4, 2017 (1d) |
| Mar 2, 2017 | TSRO | ↓ Sell | 1,428 | $177.61 | $254K | Direct | Mar 3, 2017 (1d) |
| Jan 3, 2017 | TSRO | ↓ Sell | 190 | $136.26 | $26K | Direct | Jan 3, 2017 (0d) |
| Nov 2, 2016 | TSRO | ↓ Sell | 327 | $121.29 | $40K | Direct | Nov 3, 2016 (1d) |
| Sep 22, 2016 | TSRO | ↓ Sell | 408 | $108.12 | $44K | Direct | Sep 23, 2016 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
About Martin H. Huber Jr.'s insider trades
Martin H. Huber Jr. is President, CEO at Mersana Therapeutics (MRSN). Since Sep 22, 2016, Martin has reported 1 open-market purchase worth $45K and 12 sales worth $850K on SEC Form 4. There have been no open-market trades in the last 12 months.
Their filings also include grants and awards (32 filings), option exercises (10 filings), shares returned to the company (2 filings), other transactions (2 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every MRSN insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.