Huber Martin H. Jr.

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	4,514	2.62 k	122,875
15 Jan 25	MRSN Mersana Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	11,062	0.00	127,389
15 Jan 25	MRSN Mersana Therapeutics	RSU Common Stock	Grant	Acquire A	No	No	0	181,400	0.00	181,400
15 Jan 25	MRSN Mersana Therapeutics	Stock Option Common Stock	Grant	Acquire A	No	No	0.64	816,300	522.43 k	816,300
15 Jan 25	MRSN Mersana Therapeutics	RSU Common Stock	Option exercise	Dispose M	No	No	0	11,062	0.00	33,188
12 Sep 24	MRSN Mersana Therapeutics	Common Stock	Sell	Dispose S	No	Yes	1.76	50,423	88.74 k	116,327
11 Sep 24	MRSN Mersana Therapeutics	Common Stock	Option exercise	Acquire M	No	No	0	166,750	0.00	166,750
11 Sep 24	MRSN Mersana Therapeutics	RSU Common Stock	Option exercise	Dispose M	No	No	0	166,750	0.00	500,250
7 Feb 24	SNDX Syndax Pharmaceuticals	Common Stock	Grant	Acquire A	No	No	0	17,000	0.00	49,000
15 Jan 24	MRSN Mersana Therapeutics	RSU Common Stock	Grant	Acquire A	No	No	0	44,250	0.00	44,250

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