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SEC Form 4 research

Mersana Therapeutics, Inc. insider transactions

Inspect Mersana Therapeutics, Inc.'s public SEC insider acquisitions and sales, reporting owners and source receipts.

As of 2026-10-15T08:02:39.132Z

Issuer CIK
0001442836
Reporting owners
41
Officers and directors
14
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What is a Form 4?

Animation: what a Form 4 is, shown with one real example. Sonic Automotive (SAH) reporting owner Paul P. Rusnak bought 13,701 shares at $59.78 on Wednesday, October 7, 2026, transaction code P, an open-market purchase (S is a sale and A is an award from the company). A timeline marks the SEC's two-business-day filing deadline, which ends Friday, October 9. The SEC accepted the Form 4 at 4:33:21 PM ET on October 9, and NexusTrade treats it as public one minute later, at 4:34:21 PM ET. A lamp for NexusTrade's InsiderTrades indicator stays off from the trade date until that moment, then counts one purchase worth 13,701 × $59.78 = $819,045.78.
In this example the shares were bought on Oct 7, 2026, and NexusTrade's InsiderTrades indicator can count the purchase starting at 4:34:21 PM ET on Oct 9, one minute after the SEC accepted the Form 4.

A Form 4 is the SEC filing a company insider, such as an officer, director or 10% owner, uses to report a trade in the company's stock, generally within two business days. The animation follows one real filing as an example: Paul P. Rusnak's purchase of Sonic Automotive (SAH) shares on October 7, 2026.

The same reading applies to every row on this page. The trade date is when the shares changed hands. The available date is when NexusTrade treats the filing as public, and a NexusTrade InsiderTrades indicator counts a purchase (code P) or sale (code S) only from that moment. Code A awards are not counted as purchases.

Recent insider disclosures

This table includes purchases, sales and awards in the public filing record. Awards and open-market purchases are distinct transaction codes. For historical research, use the public availability date to determine when the transaction was knowable.

Read code P as a purchase, S as a sale and A as an award. An award is an acquisition, but it is not an open-market purchase. Open the filing receipt to check the transaction details.

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Most recent 90-day source activity, up to 50 rows. No rows means no matching recent records, not no historical activity.

Officers and directors in the directory

Show the table · 14 rows, 3 columns

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Lowinger Timothy B000170977549
DeSchuytner Brian00017821637
Protopapas Anna000134758234
Huber Martin H. Jr.000165327613
Yang Arvin00018343213
MISRA TUSHAR00018772334
MOTT DAVID M0001219871144
Alleva Lawrence M000155305322
Hack Andrew A. F.000165743460
Bala Mohan00019917878
Carvajal Alejandra000164575523
Jack Eva M.00017097711
Kaufman Michael J.00017099962
Mandelia Ashish000178280513
Lowinger Timothy B ↗DeSchuytner Brian ↗Protopapas Anna ↗Huber Martin H. Jr. ↗Yang Arvin ↗MISRA TUSHAR ↗MOTT DAVID M ↗Alleva Lawrence M ↗Hack Andrew A. F. ↗Bala Mohan ↗Carvajal Alejandra ↗Jack Eva M. ↗Kaufman Michael J. ↗Mandelia Ashish ↗

Which transactions qualify for the company tracker

The company strategy uses verified officers and directors with qualifying acquisitions at this issuer. Other reporting owners may appear in source records without becoming strategy signals.

This issuer meets the currently published company-strategy eligibility rules.

Historical follower simulations are separate from these source transactions. They do not establish live trading results.