MRSN - Mersana Therapeutics, Inc. - Insider Stock Trading

Filing Date	T Date	Ticker	Sector	Ind	Industry	Owner	oSt	Rel	Title	T	TVal	Price	Qty	oc	Own	H
10/28/25 16:10	10/27/25	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	S.d	-1	9.90	0	-3	3	D
10/28/25 16:10	10/25/25	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	M.d	0	0.00	0	9	3	D
9/15/25 16:26	9/12/25	MRSN	Health	Drug	Pharmaceutical Preparations	Huber Martin H. Jr.	MA	DO	P,CEO	S.d	-15	7.31	-2	-17	10	D
9/15/25 16:26	9/11/25	MRSN	Health	Drug	Pharmaceutical Preparations	Huber Martin H. Jr.	MA	DO	P,CEO	M.d	0	0.00	7	230	10	D
1/17/25 19:27	1/16/25	MRSN	Health	Drug	Pharmaceutical Preparations	Mandelia Ashish	MA	O	VP,Chief	S.d	-2	0.5800	-4	-6	58	D
1/17/25 19:27	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Mandelia Ashish	MA	O	VP,Chief	M.d	0	0.00	9	18	58	D
1/17/25 19:26	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Protopapas Anna	MA	D		M.d	0	0.00	21	5	481	D
1/17/25 19:26	1/16/25	MRSN	Health	Drug	Pharmaceutical Preparations	Protopapas Anna	MA	D		S.d	-5	0.5800	-9	-2	481	D
1/17/25 19:25	1/16/25	MRSN	Health	Drug	Pharmaceutical Preparations	Lowinger Timothy B	MA	O	SVP,Chie	S.d	-5	0.5800	-8	-3	258	D
1/17/25 19:25	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Lowinger Timothy B	MA	O	SVP,Chie	M.d	0	0.00	20	8	258	D
1/17/25 19:21	1/16/25	MRSN	Health	Drug	Pharmaceutical Preparations	Huber Martin H. Jr.	MA	DO	P,CEO	S.d	-3	0.5800	-5	-4	123	D
1/17/25 19:21	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Huber Martin H. Jr.	MA	DO	P,CEO	M.d	0	0.00	11	10	123	D
1/17/25 19:20	1/16/25	MRSN	Health	Drug	Pharmaceutical Preparations	Deschuytner Brian	MA	O	SVP,COO,	S.d	-5	0.5800	-8	-7	121	D
1/17/25 19:20	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Deschuytner Brian	MA	O	SVP,COO,	M.d	0	0.00	21	21	121	D
1/17/25 19:18	1/16/25	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	S.d	-3	0.5800	-5	-6	78	D
1/17/25 19:18	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	M.d	0	0.00	13	19	78	D
1/17/25 19:18	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	M.d	0	0.00	15	27	69	D
1/17/25 19:18	1/16/25	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	S.d	-3	0.5800	-6	-8	69	D
1/16/25 17:25	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Protopapas Anna	MA	D		S.d	-4	0.6300	-6	-1	468	D
1/16/25 17:25	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Protopapas Anna	MA	D		M.d	0	0.00	17	4	468	D
1/16/25 17:25	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Mandelia Ashish	MA	O	VP,Chief	S.d	-1	0.6300	-2	-3	52	D
1/16/25 17:25	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Mandelia Ashish	MA	O	VP,Chief	M.d	0	0.00	5	10	52	D
1/16/25 17:24	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Lowinger Timothy B	MA	O	SVP,Chie	S.d	-1	0.6300	-2	-1	246	D
1/16/25 17:24	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Lowinger Timothy B	MA	O	SVP,Chie	M.d	0	0.00	5	2	246	D
1/16/25 17:23	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Deschuytner Brian	MA	O	SVP,COO,	M.d	0	0.00	6	6	109	D
1/16/25 17:23	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Deschuytner Brian	MA	O	SVP,COO,	S.d	-1	0.6300	-2	-2	109	D
1/16/25 17:23	1/15/25	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	S.d	-1	0.6300	-1	-1	71	D
1/16/25 17:23	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	M.d	0	0.00	3	4	71	D
1/15/25 21:20	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Protopapas Anna	MA	D		S.d	-8	0.6600	-12	-2	457	D
1/15/25 21:20	1/13/25	MRSN	Health	Drug	Pharmaceutical Preparations	Protopapas Anna	MA	D		M.d	0	0.00	31	7	457	D
1/15/25 21:19	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Mandelia Ashish	MA	O	VP,Chief	S.d	-1	0.6600	-1	-2	49	D
1/15/25 21:19	1/13/25	MRSN	Health	Drug	Pharmaceutical Preparations	Mandelia Ashish	MA	O	VP,Chief	M.d	0	0.00	3	6	49	D
1/15/25 21:18	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Lowinger Timothy B	MA	O	SVP,Chie	S.d	-2	0.6600	-3	-1	243	D
1/15/25 21:18	1/13/25	MRSN	Health	Drug	Pharmaceutical Preparations	Lowinger Timothy B	MA	O	SVP,Chie	M.d	0	0.00	9	4	243	D
1/15/25 21:17	1/13/25	MRSN	Health	Drug	Pharmaceutical Preparations	Deschuytner Brian	MA	O	SVP,COO,	M.d	0	0.00	10	11	105	D
1/15/25 21:17	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Deschuytner Brian	MA	O	SVP,COO,	S.d	-2	0.6600	-4	-3	105	D
1/15/25 21:17	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	S.d	-2	0.6600	-3	-5	69	D
1/15/25 21:17	1/13/25	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	M.d	0	0.00	9	15	69	D
1/15/25 21:16	1/14/25	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	S.d	-2	0.6600	-3	-5	60	D
1/15/25 21:16	1/13/25	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	M.d	0	0.00	9	17	60	D
10/29/24 16:43	10/28/24	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	S.d	-4	1.90	-2	-3	55	D
10/29/24 16:43	10/25/24	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	M.d	0	0.00	6	13	55	D
10/7/24 17:48	10/2/24	MRSN	Health	Drug	Pharmaceutical Preparations	Deschuytner Brian	MA	O	SVP,COO,	S.dm	-27	1.98	-14	-13	95	D
10/7/24 17:48	10/1/24	MRSN	Health	Drug	Pharmaceutical Preparations	Deschuytner Brian	MA	O	SVP,COO,	M.d	0	0.00	50	112	95	D
10/7/24 17:48	10/1/24	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	M.d	0	0.00	50	365	64	D
10/7/24 17:48	10/2/24	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	S.dm	-27	1.98	-14	-18	64	D
10/7/24 17:47	10/2/24	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	S.dm	-27	1.98	-14	-21	50	D
10/7/24 17:47	10/1/24	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	M.d	0	0.00	50	999%	50	D
10/7/24 17:47	10/2/24	MRSN	Health	Drug	Pharmaceutical Preparations	Mandelia Ashish	MA	O	VP,Chief	S.dm	-16	1.98	-8	-15	48	D
10/7/24 17:47	10/1/24	MRSN	Health	Drug	Pharmaceutical Preparations	Mandelia Ashish	MA	O	VP,Chief	M.d	0	0.00	30	169	48	D
10/7/24 17:46	10/2/24	MRSN	Health	Drug	Pharmaceutical Preparations	Lowinger Timothy B	MA	O	SVP,Chie	S.dm	-27	1.98	-14	-5	236	D
10/7/24 17:46	10/1/24	MRSN	Health	Drug	Pharmaceutical Preparations	Lowinger Timothy B	MA	O	SVP,Chie	M.d	0	0.00	50	27	236	D
9/13/24 17:08	9/12/24	MRSN	Health	Drug	Pharmaceutical Preparations	Huber Martin H. Jr.	MA	DO	P,CEO	S.d	-89	1.76	-50	-30	116	D
9/13/24 17:08	9/11/24	MRSN	Health	Drug	Pharmaceutical Preparations	Huber Martin H. Jr.	MA	DO	P,CEO	M.d	0	0.00	167		116	D
1/17/24 17:21	1/16/24	MRSN	Health	Drug	Pharmaceutical Preparations	Protopapas Anna	MA	D		S.d	-80	2.71	-29	-6	438	D
1/17/24 17:21	1/13/24	MRSN	Health	Drug	Pharmaceutical Preparations	Protopapas Anna	MA	D		M.dm	0	0.00	87	25	438	D
1/17/24 17:21	1/16/24	MRSN	Health	Drug	Pharmaceutical Preparations	Misra Tushar	MA	O	SVP,Chie	S.d	-9	2.71	-3	-16	18	D
1/17/24 17:21	1/13/24	MRSN	Health	Drug	Pharmaceutical Preparations	Misra Tushar	MA	O	SVP,Chie	M.dm	0	0.00	9	91	18	D
1/17/24 17:20	1/16/24	MRSN	Health	Drug	Pharmaceutical Preparations	Mandelia Ashish	MA	O	VP,Chief	S.d	-14	2.71	-5	-18	23	D
1/17/24 17:20	1/13/24	MRSN	Health	Drug	Pharmaceutical Preparations	Mandelia Ashish	MA	O	VP,Chief	M.dm	0	0.00	13	121	23	D
1/17/24 17:19	1/16/24	MRSN	Health	Drug	Pharmaceutical Preparations	Lowinger Timothy B	MA	O	SVP,Chie	S.d	-28	2.71	-10	-5	199	D
1/17/24 17:19	1/13/24	MRSN	Health	Drug	Pharmaceutical Preparations	Lowinger Timothy B	MA	O	SVP,Chie	M.dm	0	0.00	29	17	199	D
1/17/24 17:18	1/16/24	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	S.d	-12	2.71	-4	-14	27	D
1/17/24 17:18	1/13/24	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	M.dm	0	0.00	11	72	27	D
1/17/24 17:18	1/16/24	MRSN	Health	Drug	Pharmaceutical Preparations	Deschuytner Brian	MA	O	SVP,COO,	S.d	-25	2.71	-9	-15	55	D
1/17/24 17:18	1/13/24	MRSN	Health	Drug	Pharmaceutical Preparations	Deschuytner Brian	MA	O	SVP,COO,	M.dm	0	0.00	26	94	55	D
1/17/24 17:16	1/16/24	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	S.d	-9	2.71	-3	-20	14	D
1/17/24 17:16	1/13/24	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	M.d	0	0.00	9	165	14	D
10/27/23 16:07	10/26/23	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	S.d	-2	1.13	-2	-18	9	D
10/27/23 16:07	10/25/23	MRSN	Health	Drug	Pharmaceutical Preparations	Bala Mohan	MA	O	SVP,Chie	M.d	0	0.00	6	252	9	D
8/18/23 16:01	8/17/23	MRSN	Health	Drug	Pharmaceutical Preparations	Misra Tushar	MA	O	SVP,Chie	S.d	-2	1.18	-2	-14	12	D
8/18/23 16:01	8/16/23	MRSN	Health	Drug	Pharmaceutical Preparations	Misra Tushar	MA	O	SVP,Chie	M.d	0	0.00	6	119	12	D
4/28/23 16:15	4/26/23	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	M.d	0	0.00	13	187	20	D
4/28/23 16:15	4/27/23	MRSN	Health	Drug	Pharmaceutical Preparations	Carvajal Alejandra	MA	O	SVP,GC	S.d	-15	3.89	-4	-16	20	D

D	Derivative transaction in filing (usually option exercise)
M	Multiple transactions in filing; earliest reported transaction date and weighted average transaction price
A	Amended filing
E	Error detected in filing

S - Sale	Sale of securities on an exchange or to another person
S - Sale+OE	Sale of securities on an exchange or to another person (after option exercise)
F - Tax	Payment of exercise price or tax liability using portion of securities received from the company
P - Purchase	Purchase of securities on an exchange or from another person

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