Martin H. Huber Jr. Mersana Therapeutics, Inc. (MRSN) insider trading activity

Martin H. Huber Jr. is President, CEO of Mersana Therapeutics, Inc.. Currently has a direct ownership of 9,572 shares of MRSN, which is worth approximately $68,631. The most recent transaction as insider was on Sep 12, 2025, when has been sold 2,012 shares (Common Stock) at a price of $7.31 per share, resulting in proceeds of $14,707. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 9.57K

92.21% 3M change

91.77% 12M change

Total Value Held $68,631

Martin H. Huber Jr. Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Sep 12 2025	SELL Open market or private sale	$14,707 $7.31 p/Share	2,012 Reduced 17.37%	9,572 Common Stock
Sep 11 2025	BUY Exercise of conversion of derivative security	-	6,670 Added 36.54%	11,584 Common Stock
Jan 16 2025	SELL Open market or private sale	$2,618 $0.58 p/Share	4,514 Reduced 3.54%	122,875 Common Stock
Jan 15 2025	BUY Exercise of conversion of derivative security	-	11,062 Added 7.99%	127,389 Common Stock
Sep 12 2024	SELL Open market or private sale	$88,744 $1.76 p/Share	50,423 Reduced 30.24%	116,327 Common Stock
Sep 11 2024	BUY Exercise of conversion of derivative security	-	166,750 Added 50.0%	166,750 Common Stock
Jun 08 2023	BUY Grant, award, or other acquisition	-	14,467 Added 50.0%	14,467 Common Stock

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PRESIDENT AND HEAD OF R&D

MHH

Martin H. Huber Jr.

President, CEO

Waltham, MA

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