Brian De Schuytner Mersana Therapeutics, Inc. (MRSN) insider trading activity

Brian De Schuytner is SVP, COO & CFO of Mersana Therapeutics, Inc.. Currently has a direct ownership of 121,393 shares of MRSN, which is worth approximately $75,263. The most recent transaction as insider was on Jan 16, 2025, when has been sold 8,470 shares (Common Stock) at a price of $0.58 per share, resulting in proceeds of $4,912. This information was disclosed in a Form 4 filing with the Securities and Exchange Commission (SEC).

Shares Held (Direct Ownership) 121K

28.02% 3M change

122.69% 12M change

Total Value Held $75,263

Brian DeSchuytner Transaction History

Date	Transaction	Value	Shares Traded	Shares Held
Jan 16 2025	SELL Open market or private sale	$4,912 $0.58 p/Share	8,470 Reduced 6.52%	121,393 Common Stock
Jan 15 2025	SELL Open market or private sale	$1,468 $0.63 p/Share	2,331 Reduced 2.09%	109,030 Common Stock
Jan 15 2025	BUY Exercise of conversion of derivative security	-	20,833 Added 13.82%	129,863 Common Stock
Jan 14 2025	SELL Open market or private sale	$2,450 $0.66 p/Share	3,713 Reduced 3.41%	105,111 Common Stock
Jan 14 2025	BUY Exercise of conversion of derivative security	-	6,250 Added 5.31%	111,361 Common Stock
Jan 13 2025	BUY Exercise of conversion of derivative security	-	10,000 Added 8.42%	108,824 Common Stock
Oct 03 2024	SELL Open market or private sale	$10,972 $1.96 p/Share	5,598 Reduced 5.57%	94,824 Common Stock
Oct 02 2024	SELL Open market or private sale	$16,178 $2.0 p/Share	8,089 Reduced 7.45%	100,422 Common Stock
Oct 01 2024	BUY Exercise of conversion of derivative security	-	50,000 Added 31.54%	108,511 Common Stock
Jan 16 2024	SELL Open market or private sale	$25,276 $2.71 p/Share	9,327 Reduced 14.61%	54,511 Common Stock
Jan 15 2024	BUY Exercise of conversion of derivative security	-	10,208 Added 13.79%	63,838 Common Stock
Jan 14 2024	BUY Exercise of conversion of derivative security	-	6,250 Added 10.1%	55,630 Common Stock
Jan 13 2024	BUY Exercise of conversion of derivative security	-	10,000 Added 17.43%	47,380 Common Stock
Jan 17 2023	SELL Open market or private sale	$29,451 $5.74 p/Share	5,131 Reduced 13.53%	32,781 Common Stock
Jan 15 2023	BUY Exercise of conversion of derivative security	-	10,208 Added 21.21%	37,912 Common Stock
Jan 14 2023	BUY Exercise of conversion of derivative security	-	6,250 Added 18.41%	27,704 Common Stock
Jan 14 2022	BUY Exercise of conversion of derivative security	-	10,208 Added 36.74%	17,573 Common Stock
Jan 15 2021	SELL Payment of exercise price or tax liability	$24,507 $21.09 p/Share	1,162 Reduced 15.32%	6,423 Common Stock
Jan 15 2021	BUY Exercise of conversion of derivative security	-	3,959 Added 34.29%	7,585 Common Stock

Brian De Schuytner

SVP, COO & CFO

Cambridge, MA

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