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General | Insiders | Insider Transactions | Monthly Overview | Weekly Overview

Overview of all insider trading transactions in Mersana Therapeutics, Inc.. Get notifications about new insider transactions in Mersana Therapeutics, Inc. for free.

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Date	Ticker	Company	Owner	Relationship	Transaction	Code	Cost ($)	Shares	Transaction Value ($)	Total Shares	% Holdings
Apr 13 2020	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Buy	J	0.00	20,000	0	20,000	0 to 20 K
Apr 13 2020	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Sell	J	0.00	40,000	0	0	40 K to 0 (-100.00 %)
Apr 13 2020	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Sell	J	0.00	40,000	0	0	40 K to 0 (-100.00 %)
Apr 13 2020	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Buy	J	0.00	40,000	0	40,000	0 to 40 K
Apr 13 2020	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Buy	J	0.00	40,000	0	40,000	0 to 40 K
Apr 13 2020	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Sell	J	0.00	4,000,000	0	7,959,520	12 M to 8 M (-33.45 %)
Apr 13 2020	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Sell	J	0.00	4,000,000	0	7,959,520	12 M to 8 M (-33.45 %)
Apr 09 2020	MRSN	Mersana Therapeuti ...	Hack Andrew A. F.	Director	Buy	P	7.74	645,667	4,997,463	3,445,667	2.8 M to 3.4 M (+23.06 %)
Apr 09 2020	MRSN	Mersana Therapeuti ...	Hack Andrew A. F.	Director	Buy	P	5.59	2,800,000	15,652,000	2,800,000	0 to 2.8 M
Apr 09 2020	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Buy	P	5.59	538,599	3,010,768	538,599	0 to 538.6 K
Jan 16 2020	MRSN	Mersana Therapeuti ...	Huebner Dirk	Chief Medical Offic ...	Option Exercise	A	0.00	18,333	0	18,333
Jan 16 2020	MRSN	Mersana Therapeuti ...	Huebner Dirk	Chief Medical Offic ...	Option Exercise	A	6.16	82,500	508,200	82,500
Jan 16 2020	MRSN	Mersana Therapeuti ...	DeSchuytner Brian	Sr. VP., FIN, Produ ...	Option Exercise	A	0.00	15,833	0	15,833
Jan 16 2020	MRSN	Mersana Therapeuti ...	DeSchuytner Brian	Sr. VP., FIN, Produ ...	Option Exercise	A	6.16	71,250	438,900	71,250
Jan 16 2020	MRSN	Mersana Therapeuti ...	Protopapas Anna	President & CEO	Option Exercise	A	0.00	70,833	0	70,833
Jan 16 2020	MRSN	Mersana Therapeuti ...	Protopapas Anna	President & CEO	Option Exercise	A	6.16	318,750	1,963,500	318,750
Jan 16 2020	MRSN	Mersana Therapeuti ...	Mandelia Ashish	VP, Controller	Option Exercise	A	0.00	3,333	0	3,333
Jan 16 2020	MRSN	Mersana Therapeuti ...	Mandelia Ashish	VP, Controller	Option Exercise	A	6.16	15,000	92,400	15,000
Jan 16 2020	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Science, Tech ...	Option Exercise	A	0.00	31,667	0	31,667
Jan 16 2020	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Science, Tech ...	Option Exercise	A	6.16	142,500	877,800	142,500
Jan 16 2020	MRSN	Mersana Therapeuti ...	Kaufman Michael J.	Sr., VP, CHEM., MFG ...	Option Exercise	A	0.00	26,667	0	26,667
Jan 16 2020	MRSN	Mersana Therapeuti ...	Kaufman Michael J.	Sr., VP, CHEM., MFG ...	Option Exercise	A	6.16	120,000	739,200	120,000
Jan 16 2020	MRSN	Mersana Therapeuti ...	Jack Eva M.	Chief Bus. Officer, ...	Option Exercise	A	0.00	18,333	0	18,333
Jan 16 2020	MRSN	Mersana Therapeuti ...	Jack Eva M.	Chief Bus. Officer, ...	Option Exercise	A	6.16	82,500	508,200	82,500
Jan 03 2020	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Option Exercise	A	5.36	19,713	105,662	19,713
Jan 03 2020	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Option Exercise	A	5.36	19,713	105,662	19,713
Jan 03 2020	MRSN	Mersana Therapeuti ...	Hege Kristen	Director	Option Exercise	A	5.36	11,264	60,375	11,264
Jan 03 2020	MRSN	Mersana Therapeuti ...	Hege Kristen	Director	Option Exercise	A	5.36	11,264	60,375	11,264
Jan 03 2020	MRSN	Mersana Therapeuti ...	Dere Willard H	Director	Option Exercise	A	5.36	11,264	60,375	11,264
Jan 03 2020	MRSN	Mersana Therapeuti ...	Dere Willard H	Director	Option Exercise	A	5.36	11,264	60,375	11,264
Jan 03 2020	MRSN	Mersana Therapeuti ...	Alleva Lawrence M	Director	Option Exercise	A	5.36	11,264	60,375	11,264
Jan 03 2020	MRSN	Mersana Therapeuti ...	Alleva Lawrence M	Director	Option Exercise	A	5.36	11,264	60,375	11,264
Jul 19 2019	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Option Exercise	A	0.00	40,000	0	40,000
Jul 19 2019	MRSN	Mersana Therapeuti ...	Kaufman Michael J.	Sr VP Chemistry, Ma ...	Option Exercise	A	0.00	40,000	0	40,000
Jul 19 2019	MRSN	Mersana Therapeuti ...	Jack Eva M.	CBO, Treasurer & Se ...	Option Exercise	A	0.00	40,000	0	40,000
Jul 19 2019	MRSN	Mersana Therapeuti ...	Huebner Dirk	Chief Medical Offic ...	Option Exercise	A	0.00	40,000	0	40,000
Jul 19 2019	MRSN	Mersana Therapeuti ...	Protopapas Anna	President & CEO	Option Exercise	A	0.00	100,000	0	100,000
Jul 12 2019	MRSN	Mersana Therapeuti ...	DeSchuytner Brian	Sr. VP, Finance & P ...	Option Exercise	A	3.99	240,000	957,600	240,000
Jun 11 2019	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Option Exercise	A	4.31	25,000	107,750	25,000
Jun 11 2019	MRSN	Mersana Therapeuti ...	Alleva Lawrence M	Director	Option Exercise	A	4.31	25,000	107,750	25,000
Jun 11 2019	MRSN	Mersana Therapeuti ...	Hege Kristen	Director	Option Exercise	A	4.31	25,000	107,750	25,000
Jun 11 2019	MRSN	Mersana Therapeuti ...	Dere Willard H	Director	Option Exercise	A	4.31	25,000	107,750	25,000
Jun 11 2019	MRSN	Mersana Therapeuti ...	Hack Andrew A. F.	Director	Option Exercise	A	4.31	25,000	107,750	25,000
Mar 06 2019	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Buy	P	4.00	3,750,000	15,000,000	11,890,138	8.1 M to 11.9 M (+46.07 %)
Mar 06 2019	MRSN	Mersana Therapeuti ...	New Enterprise Associates 14, ...	10% Owner	Buy	P	4.00	3,750,000	15,000,000	11,890,138	8.1 M to 11.9 M (+46.07 %)
Jan 25 2019	MRSN	Mersana Therapeuti ...	Jack Eva M.	CBO, Treasurer & Se ...	Option Exercise	A	3.51	60,000	210,600	60,000
Jan 25 2019	MRSN	Mersana Therapeuti ...	Spellman David A	Chief Financial Off ...	Option Exercise	A	3.51	100,000	351,000	100,000
Jan 25 2019	MRSN	Mersana Therapeuti ...	Kaufman Michael J.	Sr VP Chemistry, Ma ...	Option Exercise	A	3.51	60,000	210,600	60,000
Jan 25 2019	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Option Exercise	A	3.51	60,000	210,600	60,000
Jan 25 2019	MRSN	Mersana Therapeuti ...	Protopapas Anna	President & CEO	Option Exercise	A	3.51	217,500	763,425	217,500
Jan 25 2019	MRSN	Mersana Therapeuti ...	Foster Wayne	Vice President of F ...	Option Exercise	A	3.51	30,750	107,933	30,750
Jan 04 2019	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Option Exercise	A	4.31	25,292	109,009	25,292
Jan 04 2019	MRSN	Mersana Therapeuti ...	Dere Willard H	Director	Option Exercise	A	4.31	13,619	58,698	13,619
Jan 04 2019	MRSN	Mersana Therapeuti ...	Alleva Lawrence M	Director	Option Exercise	A	4.31	13,619	58,698	13,619
Dec 03 2018	MRSN	Mersana Therapeuti ...	Huebner Dirk	Chief Medical Offic ...	Option Exercise	A	5.30	100,000	530,000	100,000
Sep 25 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Option Exercise	M	1.40	3,500	4,900	89,833
Sep 25 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Sell	S	11.63	3,500	40,705	12,491	16 K to 12.5 K (-21.89 %)
Sep 25 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Buy	M	1.40	3,500	4,900	15,991	12.5 K to 16 K (+28.02 %)
Sep 21 2018	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Option Exercise	A	12.27	10,000	122,700	10,000
Sep 21 2018	MRSN	Mersana Therapeuti ...	Alleva Lawrence M	Director	Option Exercise	A	12.27	10,000	122,700	10,000
Sep 21 2018	MRSN	Mersana Therapeuti ...	Hege Kristen	Director	Option Exercise	A	12.27	10,000	122,700	10,000
Sep 21 2018	MRSN	Mersana Therapeuti ...	Hack Andrew A. F.	Director	Option Exercise	A	12.27	10,000	122,700	10,000
Aug 29 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Option Exercise	M	7.43	3,500	26,005	1,611
Aug 29 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Sell	S	13.15	3,500	46,025	12,491	16 K to 12.5 K (-21.89 %)
Aug 29 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Buy	M	7.43	3,500	26,005	15,991	12.5 K to 16 K (+28.02 %)
Jul 25 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Sell	S	11.06	3,500	38,710	12,491	16 K to 12.5 K (-21.89 %)
Jul 05 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Option Exercise	M	1.40	10,000	14,000	93,333
Jul 05 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Buy	M	1.40	10,000	14,000	15,991	6 K to 16 K (+166.92 %)
Mar 21 2018	MRSN	Mersana Therapeuti ...	Dere Willard H	Director	Option Exercise	A	17.38	20,000	347,600	20,000
Mar 14 2018	MRSN	Mersana Therapeuti ...	Spellman David A	Chief Financial Off ...	Option Exercise	A	13.97	150,000	2,095,500	150,000
Feb 23 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Option Exercise	M	6.98	5,911	41,259	0
Feb 23 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Buy	M	6.98	5,911	41,259	5,911	0 to 5.9 K
Feb 06 2018	MRSN	Mersana Therapeuti ...	Lowinger Timothy B	Chief Scientific Of ...	Option Exercise	A	14.23	56,884	809,459	56,884
Feb 06 2018	MRSN	Mersana Therapeuti ...	Protopapas Anna	President & CEO	Option Exercise	A	14.23	200,000	2,846,000	200,000
Feb 06 2018	MRSN	Mersana Therapeuti ...	Jack Eva M.	CBO, Treasurer & Se ...	Option Exercise	A	14.23	50,057	712,311	50,057
Feb 06 2018	MRSN	Mersana Therapeuti ...	Foster Wayne	Vice President of F ...	Option Exercise	A	14.23	20,250	288,158	20,250
Feb 06 2018	MRSN	Mersana Therapeuti ...	Kaufman Michael J.	Sr.VP Chemistry,Man ...	Option Exercise	A	14.23	50,057	712,311	50,057
Feb 06 2018	MRSN	Mersana Therapeuti ...	Bergstrom Donald A	Chief Medical Offic ...	Option Exercise	A	14.23	56,884	809,459	56,884
Feb 01 2018	MRSN	Mersana Therapeuti ...	Foster Wayne	Vice President of F ...	Option Exercise	M	6.98	2,499	17,443	10,834
Feb 01 2018	MRSN	Mersana Therapeuti ...	Foster Wayne	Vice President of F ...	Option Exercise	M	4.10	3,262	13,374	8,155
Feb 01 2018	MRSN	Mersana Therapeuti ...	Foster Wayne	Vice President of F ...	Option Exercise	M	1.53	8,055	12,324	12,084
Feb 01 2018	MRSN	Mersana Therapeuti ...	Foster Wayne	Vice President of F ...	Option Exercise	M	1.62	889	1,440	889
Feb 01 2018	MRSN	Mersana Therapeuti ...	Foster Wayne	Vice President of F ...	Buy	M	6.98	2,499	17,443	71,083	68.6 K to 71.1 K (+3.64 %)
Feb 01 2018	MRSN	Mersana Therapeuti ...	Foster Wayne	Vice President of F ...	Buy	M	4.10	3,262	13,374	68,584	65.3 K to 68.6 K (+4.99 %)
Feb 01 2018	MRSN	Mersana Therapeuti ...	Foster Wayne	Vice President of F ...	Buy	M	1.53	8,055	12,324	65,322	57.3 K to 65.3 K (+14.07 %)
Feb 01 2018	MRSN	Mersana Therapeuti ...	Foster Wayne	Vice President of F ...	Buy	M	1.62	889	1,440	57,267	56.4 K to 57.3 K (+1.58 %)
Jan 04 2018	MRSN	Mersana Therapeuti ...	Nayeem Sara M.	Director	Option Exercise	A	17.39	3,560	61,908	3,560
Jan 04 2018	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Option Exercise	A	17.39	6,611	114,965	6,611
Dec 21 2017	MRSN	Mersana Therapeuti ...	Protopapas Anna	President and CEO	Option Exercise	M	1.53	10,417	15,938	748,366
Dec 21 2017	MRSN	Mersana Therapeuti ...	Protopapas Anna	President and CEO	Buy	M	1.53	10,417	15,938	130,719	120.3 K to 130.7 K (+8.66 %)
Sep 07 2017	MRSN	Mersana Therapeuti ...	Alleva Lawrence M	Director	Option Exercise	A	17.50	20,000	350,000	20,000
Jul 06 2017	MRSN	Mersana Therapeuti ...	Viswanathan Ravi	10% Owner	Option Exercise	C	0.00	2,216,626	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	Viswanathan Ravi	10% Owner	Option Exercise	C	0.00	18,001,419	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	Viswanathan Ravi	10% Owner	Option Exercise	C	0.00	11,931,173	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	Viswanathan Ravi	10% Owner	Buy	P	15.00	1,000,000	15,000,000	8,140,138	7.1 M to 8.1 M (+14.01 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	Viswanathan Ravi	10% Owner	Buy	C	0.00	7,140,138	0	7,140,138	0 to 7.1 M
Jul 06 2017	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Option Exercise	C	0.00	2,216,626	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Option Exercise	C	0.00	18,001,419	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Option Exercise	C	0.00	11,931,173	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Buy	P	15.00	1,000,000	15,000,000	8,140,138	7.1 M to 8.1 M (+14.01 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	Sonsini Peter W.	10% Owner	Buy	C	0.00	7,140,138	0	7,140,138	0 to 7.1 M
Jul 06 2017	MRSN	Mersana Therapeuti ...	SANDELL SCOTT D	10% Owner	Option Exercise	C	0.00	2,216,626	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	SANDELL SCOTT D	10% Owner	Option Exercise	C	0.00	18,001,419	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	SANDELL SCOTT D	10% Owner	Option Exercise	C	0.00	11,931,173	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	SANDELL SCOTT D	10% Owner	Buy	P	15.00	1,000,000	15,000,000	8,140,138	7.1 M to 8.1 M (+14.01 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	SANDELL SCOTT D	10% Owner	Buy	C	0.00	7,140,138	0	7,140,138	0 to 7.1 M
Jul 06 2017	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Option Exercise	C	0.00	2,216,626	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Option Exercise	C	0.00	18,001,419	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Option Exercise	C	0.00	11,931,173	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Buy	P	15.00	1,000,000	15,000,000	8,140,138	7.1 M to 8.1 M (+14.01 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	MOTT DAVID M	Director	Buy	C	0.00	7,140,138	0	7,140,138	0 to 7.1 M
Jul 06 2017	MRSN	Mersana Therapeuti ...	Protopapas Anna	President and CEO	Option Exercise	C	0.00	325,189	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	Protopapas Anna	President and CEO	Buy	C	0.00	72,263	0	192,565	120.3 K to 192.6 K (+60.07 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	KERINS PATRICK J	10% Owner	Option Exercise	C	0.00	2,216,626	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	KERINS PATRICK J	10% Owner	Option Exercise	C	0.00	18,001,419	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	KERINS PATRICK J	10% Owner	Option Exercise	C	0.00	11,931,173	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	KERINS PATRICK J	10% Owner	Buy	P	15.00	1,000,000	15,000,000	8,140,138	7.1 M to 8.1 M (+14.01 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	KERINS PATRICK J	10% Owner	Buy	C	0.00	7,140,138	0	7,140,138	0 to 7.1 M
Jul 06 2017	MRSN	Mersana Therapeuti ...	Florence Anthony A. Jr.	10% Owner	Option Exercise	C	0.00	2,216,626	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	Florence Anthony A. Jr.	10% Owner	Option Exercise	C	0.00	18,001,419	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	Florence Anthony A. Jr.	10% Owner	Option Exercise	C	0.00	11,931,173	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	Florence Anthony A. Jr.	10% Owner	Buy	P	15.00	1,000,000	15,000,000	8,140,138	7.1 M to 8.1 M (+14.01 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	Florence Anthony A. Jr.	10% Owner	Buy	C	0.00	7,140,138	0	7,140,138	0 to 7.1 M
Jul 06 2017	MRSN	Mersana Therapeuti ...	BASKETT FOREST	10% Owner	Option Exercise	C	0.00	2,216,626	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	BASKETT FOREST	10% Owner	Option Exercise	C	0.00	18,001,419	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	BASKETT FOREST	10% Owner	Option Exercise	C	0.00	11,931,173	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	BASKETT FOREST	10% Owner	Buy	P	15.00	1,000,000	15,000,000	8,140,138	7.1 M to 8.1 M (+14.01 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	BASKETT FOREST	10% Owner	Buy	C	0.00	7,140,138	0	7,140,138	0 to 7.1 M
Jul 06 2017	MRSN	Mersana Therapeuti ...	BARRIS PETER J	10% Owner	Option Exercise	C	0.00	2,216,626	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	BARRIS PETER J	10% Owner	Option Exercise	C	0.00	18,001,419	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	BARRIS PETER J	10% Owner	Option Exercise	C	0.00	11,931,173	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	BARRIS PETER J	10% Owner	Buy	P	15.00	1,000,000	15,000,000	8,140,138	7.1 M to 8.1 M (+14.01 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	BARRIS PETER J	10% Owner	Buy	C	0.00	7,140,138	0	7,140,138	0 to 7.1 M
Jul 06 2017	MRSN	Mersana Therapeuti ...	BARRETT M JAMES	10% Owner	Option Exercise	C	0.00	2,216,626	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	BARRETT M JAMES	10% Owner	Option Exercise	C	0.00	18,001,419	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	BARRETT M JAMES	10% Owner	Option Exercise	C	0.00	11,931,173	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	BARRETT M JAMES	10% Owner	Buy	P	15.00	1,000,000	15,000,000	8,140,138	7.1 M to 8.1 M (+14.01 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	BARRETT M JAMES	10% Owner	Buy	C	0.00	7,140,138	0	7,140,138	0 to 7.1 M
Jul 06 2017	MRSN	Mersana Therapeuti ...	New Enterprise Associates 14, ...	10% Owner	Option Exercise	C	0.00	2,216,626	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	New Enterprise Associates 14, ...	10% Owner	Option Exercise	C	0.00	18,001,419	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	New Enterprise Associates 14, ...	10% Owner	Option Exercise	C	0.00	11,931,173	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	New Enterprise Associates 14, ...	10% Owner	Buy	P	15.00	1,000,000	15,000,000	8,140,138	7.1 M to 8.1 M (+14.01 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	New Enterprise Associates 14, ...	10% Owner	Buy	C	0.00	7,140,138	0	7,140,138	0 to 7.1 M
Jul 06 2017	MRSN	Mersana Therapeuti ...	FMR LLC		Option Exercise	C	0.00	611,606	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	FMR LLC		Option Exercise	C	0.00	718,375	0	0
Jul 06 2017	MRSN	Mersana Therapeuti ...	FMR LLC		Buy	C	0.00	611,606	0	1,329,981	718.4 K to 1.3 M (+85.14 %)
Jul 06 2017	MRSN	Mersana Therapeuti ...	FMR LLC		Buy	C	0.00	718,375	0	718,375	0 to 718.4 K

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