MRSNUnknownNano-Cap
Mersana Therapeutics, Inc. Insider Trading Activity
Every SEC Form 4 insider transaction reported for Mersana Therapeutics, Inc. (MRSN), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud Research Team · SEC Form 4 & insider trading data analysts
Last updated:
Quick Answer
Are MRSN insiders buying or selling?
Mersana Therapeutics, Inc. insiders reported 15 open-market buys ($76.8M) and 78 sells ($4.9M) across 93 Form 4 filings — a net buying position of $71.9M.
Source: SEC EDGAR Form 4
Key Statistics (as of Oct 28, 2025)
Total Form 4 filings
93
SEC EDGAR
Insider filers
18
Insider buys (15)
$76.8M
Insider sells (78)
$4.9M
Insider sentiment
Net buyingNet insider flow of $71.9M in net buying.
Recent MRSN insider transactions
| Date | Insider | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 28, 2025 | Mohan Bala | SVP, Chief Development Officer | Sale | 77 | $9.90 | $762.3 |
| Sep 15, 2025 | Martin H. Huber Jr. | President, CEO | Sale | 2.0K | $7.31 | $14.7K |
| Jan 18, 2025 | Ashish Mandelia | VP, Chief Accounting Officer | Sale | 3.6K | $0.58 | $2.1K |
| Jan 18, 2025 | Anna Protopapas | Director | Sale | 8.6K | $0.58 | $5.0K |
| Jan 18, 2025 | Timothy B Lowinger | SVP, Chief Sci.&Tech. Officer | Sale | 8.0K | $0.58 | $4.7K |
| Jan 18, 2025 | Martin H. Huber Jr. | President, CEO | Sale | 4.5K | $0.58 | $2.6K |
| Jan 18, 2025 | Brian Deschuytner | SVP, COO & CFO | Sale | 8.5K | $0.58 | $4.9K |
| Jan 18, 2025 | Alejandra Carvajal | SVP, Chief Legal Officer | Sale | 5.1K | $0.58 | $3.0K |
| Jan 18, 2025 | Mohan Bala | SVP, Chief Development Officer | Sale | 5.9K | $0.58 | $3.4K |
| Jan 16, 2025 | Anna Protopapas | Director | Sale | 6.2K | $0.63 | $3.9K |
| Jan 16, 2025 | Ashish Mandelia | VP, Chief Accounting Officer | Sale | 1.8K | $0.63 | $1.1K |
| Jan 16, 2025 | Timothy B Lowinger | SVP, Chief Sci.&Tech. Officer | Sale | 1.8K | $0.63 | $1.1K |
| Jan 16, 2025 | Brian Deschuytner | SVP, COO & CFO | Sale | 2.3K | $0.63 | $1.5K |
| Jan 16, 2025 | Alejandra Carvajal | SVP, Chief Legal Officer | Sale | 952 | $0.63 | $599.76 |
| Jan 16, 2025 | Anna Protopapas | Director | Sale | 11.5K | $0.66 | $7.6K |
| Jan 16, 2025 | Ashish Mandelia | VP, Chief Accounting Officer | Sale | 1.0K | $0.66 | $664.62 |
| Jan 16, 2025 | Timothy B Lowinger | SVP, Chief Sci.&Tech. Officer | Sale | 3.5K | $0.66 | $2.3K |
| Jan 16, 2025 | Brian Deschuytner | SVP, COO & CFO | Sale | 3.7K | $0.66 | $2.5K |
| Jan 16, 2025 | Alejandra Carvajal | SVP, Chief Legal Officer | Sale | 3.3K | $0.66 | $2.2K |
| Jan 16, 2025 | Mohan Bala | SVP, Chief Development Officer | Sale | 3.3K | $0.66 | $2.1K |
| Oct 29, 2024 | Mohan Bala | SVP, Chief Development Officer | Sale | 1.9K | $1.90 | $3.6K |
| Oct 7, 2024 | Brian Deschuytner | SVP, COO & CFO | Sale | 13.7K | $1.98 | $27.2K |
| Oct 7, 2024 | Alejandra Carvajal | SVP, Chief Legal Officer | Sale | 13.7K | $1.98 | $27.2K |
| Oct 7, 2024 | Mohan Bala | SVP, Chief Development Officer | Sale | 13.7K | $1.98 | $27.2K |
| Oct 7, 2024 | Ashish Mandelia | VP, Chief Accounting Officer | Sale | 8.2K | $1.98 | $16.3K |
Showing the 25 most recent of 93 Form 4 filings for Mersana Therapeutics, Inc..
Most active MRSN insiders
- Timothy B Lowinger24 filings
- Ashish Mandelia10 filings
- F. A. Hack Andrew10 filings
- Alejandra Carvajal8 filings
- Anna Protopapas6 filings
Ask anything about MRSN insider activity
Use Trabud's AI agent to query Mersana Therapeutics, Inc.'s Form 4 history in plain English — "Show me MRSN CEO purchases this year" or compare it against any other ticker.
Open the AI agentMRSN insider trading FAQ
Are Mersana Therapeutics, Inc. insiders buying or selling?
Across 93 SEC Form 4 filings, Mersana Therapeutics, Inc. (MRSN) insiders reported 15 open-market purchases totaling $76.8M and 78 sales totaling $4.9M. That is a net buying position of $71.9M.
How many insiders trade MRSN stock?
18 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for Mersana Therapeutics, Inc.. The most recent filing was accepted on Oct 28, 2025.
Where does Trabud get MRSN insider trading data?
All MRSN insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.
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