Timothy B Lowinger Mersana Therapeutics, Inc. (MRSN) insider trading activity

Timothy B Lowinger is SVP, Chief Sci.&Tech. Officer of Mersana Therapeutics, Inc.. Currently has a direct ownership of 0 shares of MRSN, which is worth approximately $0. The most recent transaction as insider was on Jan 06, 2026, when has been sold 10,466 shares (Common Stock) at a price of $0.0 per share, resulting in proceeds of $0. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 0

100.0% 3M change

100.0% 12M change

Total Value Held $0

Timothy B Lowinger Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Jan 06 2026	SELL Disposition due to a tender of shares in a change of control transaction	-	10,466 Reduced 100.0%	0 Common Stock
Jan 16 2025	SELL Open market or private sale	$4,667 $0.58 p/Share	8,048 Reduced 3.03%	257,673 Common Stock
Jan 15 2025	SELL Open market or private sale	$1,130 $0.63 p/Share	1,794 Reduced 0.72%	245,930 Common Stock
Jan 15 2025	BUY Exercise of conversion of derivative security	-	19,791 Added 6.93%	265,721 Common Stock
Jan 14 2025	SELL Open market or private sale	$2,298 $0.66 p/Share	3,483 Reduced 1.41%	242,932 Common Stock
Jan 14 2025	BUY Exercise of conversion of derivative security	-	4,792 Added 1.9%	247,724 Common Stock
Jan 13 2025	BUY Exercise of conversion of derivative security	-	9,375 Added 3.67%	246,415 Common Stock

Oct 03 2024	SELL Open market or private sale	$10,972 $1.96 p/Share	5,598 Reduced 2.32%	235,642 Common Stock
Oct 02 2024	SELL Open market or private sale	$16,178 $2.0 p/Share	8,089 Reduced 3.24%	241,240 Common Stock
Oct 01 2024	BUY Exercise of conversion of derivative security	-	50,000 Added 16.7%	249,329 Common Stock
Jan 16 2024	SELL Open market or private sale	$28,208 $2.71 p/Share	10,409 Reduced 4.96%	199,329 Common Stock
Jan 15 2024	BUY Exercise of conversion of derivative security	-	15,208 Added 6.76%	209,738 Common Stock
Jan 14 2024	BUY Exercise of conversion of derivative security	-	4,792 Added 2.4%	194,530 Common Stock
Jan 13 2024	BUY Exercise of conversion of derivative security	-	9,375 Added 4.71%	189,738 Common Stock
Jan 17 2023	SELL Open market or private sale	$35,777 $5.74 p/Share	6,233 Reduced 3.34%	180,363 Common Stock
Jan 15 2023	BUY Exercise of conversion of derivative security	-	15,209 Added 7.54%	186,596 Common Stock
Jan 14 2023	BUY Exercise of conversion of derivative security	-	4,792 Added 2.72%	171,387 Common Stock
Dec 14 2022	BUY Exercise of conversion of derivative security	$51,980 $1.47 p/Share	35,361 Added 17.51%	166,595 Common Stock
Jan 18 2022	SELL Open market or private sale	$28,067 $5.92 p/Share	4,741 Reduced 3.49%	131,234 Common Stock
Jan 14 2022	BUY Exercise of conversion of derivative security	-	15,209 Added 10.06%	135,975 Common Stock
Dec 20 2021	BUY Exercise of conversion of derivative security	$63,830 $1.4 p/Share	45,593 Added 27.41%	120,766 Common Stock
Aug 20 2021	SELL Open market or private sale	$24,398 $11.01 p/Share	2,216 Reduced 2.86%	75,173 Common Stock
Aug 20 2021	BUY Exercise of conversion of derivative security	$13,651 $6.16 p/Share	2,216 Added 2.78%	77,389 Common Stock
Jul 20 2021	SELL Open market or private sale	$26,969 $12.11 p/Share	2,227 Reduced 2.88%	75,173 Common Stock
Jul 20 2021	BUY Exercise of conversion of derivative security	$13,718 $6.16 p/Share	2,227 Added 2.8%	77,400 Common Stock

TBL

Timothy B Lowinger

SVP, Chief Sci.&Tech. Officer

Cambridge, MA

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