Carvajal Alejandra

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
16 Jan 25	MRSN Mersana Therapeutics	Common Stock	Sell	Dispose S	No	Yes	0.58	5,096	2.96 k	78,296
15 Jan 25	MRSN Mersana Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	12,500	0.00	83,392
15 Jan 25	MRSN Mersana Therapeutics	RSU Common Stock	Grant	Acquire A	No	No	0	54,167	0.00	54,167
15 Jan 25	MRSN Mersana Therapeutics	Stock Option Common Stock	Grant	Acquire A	No	No	0.64	243,750	156.00 k	243,750
15 Jan 25	MRSN Mersana Therapeutics	RSU Common Stock	Option exercise	Dispose M	No	No	0	12,500	0.00	37,500
15 Jan 25	MRSN Mersana Therapeutics	Common Stock	Sell	Dispose S	No	Yes	0.63	952	599.76	70,892
14 Jan 25	MRSN Mersana Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	2,500	0.00	71,844
14 Jan 25	MRSN Mersana Therapeutics	RSU Common Stock	Option exercise	Dispose M	No	No	0	2,500	0.00	2,500
14 Jan 25	MRSN Mersana Therapeutics	Common Stock	Sell	Dispose S	No	Yes	0.66	3,330	2.20 k	69,344
13 Jan 25	MRSN Mersana Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	8,958	0.00	72,674

Data from 3, 4 and 5 filings. Values as filed, not updated for current price.