Insider Holders & Insider Ownership - Mersana Therapeutics Inc. (MRSN)

List of insiders holdings for Mersana Therapeutics Inc.:
  1. Shares directly owned by the insider.
  2. Shares indirectly owned by the insider.
  3. Total shares owned by the insider (sum of shares directly and indirectly owned).
  4. Total market value if available.
  5. Shares are not adjusted for stock split.
"Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise"
- Peter Lynch
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#Insider Holder NameReport
Date Time		Shares Owned
Directly
Indirectly		Total
Shares Owned		Filing
1NEXTECH CROSSOVER I SCSP
Nextech Crossover I GP S.a r.l.
Charoub Ian
Constantinides Costas
Sgobbo Rocco
10% Owner		2024-12-30 16:12:1712,067,246
0		12,067,246Form 3
2BARRETT M JAMES
10% Owner		2017-07-06 17:16:280
8,140,138		8,140,138Form 4
3Viswanathan Ravi
10% Owner		2017-07-06 17:20:300
8,140,138		8,140,138Form 4
4NEA Partners 14 L.P.
NEA 14 GP LTD
10% Owner		2020-09-16 16:43:0840,000
7,959,520		7,999,520Form 4
5Florence Anthony A. Jr.
10% Owner		2020-09-16 16:45:354,285
2,080,520		2,084,805Form 4
6BASKETT FOREST
10% Owner		2020-09-16 16:44:180
2,073,464		2,073,464Form 4
7SANDELL SCOTT D
10% Owner		2020-09-16 16:47:360
2,072,194		2,072,194Form 4
8KERINS PATRICK J
10% Owner		2020-09-16 16:46:354,796
2,060,000		2,064,796Form 4
9Sonsini Peter W.
10% Owner		2020-09-16 16:48:25993
2,061,192		2,062,185Form 4
10Huber Martin H. Jr.
President, CEO		2025-01-17 19:21:151,153,763
0		1,153,763Form 4
11FMR LLC
See Remark 1		2018-02-13 09:40:30884,015
0		884,015Form 13G
12Lowinger Timothy B
SVP, Chief Sci.&Tech. Officer		2025-01-17 19:25:05593,090
0		593,090Form 4
13DeSchuytner Brian
SVP, COO & CFO		2025-01-17 19:20:02508,893
0		508,893Form 4
14Bala Mohan
SVP, Chief Development Officer		2025-01-17 19:18:07456,372
0		456,372Form 4
15Carvajal Alejandra
SVP, Chief Legal Officer		2025-01-17 19:18:50413,713
0		413,713Form 4
16Yang Arvin
SVP, Chief Medical Officer		2023-01-18 20:29:00317,903
0		317,903Form 4
17MISRA TUSHAR
SVP, Chief Manuf. Officer		2024-01-17 17:21:21271,299
0		271,299Form 4
18Mandelia Ashish
VP, Chief Accounting Officer		2025-01-17 19:27:39161,687
0		161,687Form 4
19Huebner Dirk
Chief Medical Officer		2020-01-16 16:34:44100,833
0		100,833Form 4
20Spellman David A
Chief Financial Officer		2019-01-25 16:07:18100,000
0		100,000Form 4
21MOTT DAVID M
Director		2025-06-13 16:55:2061,500
0		61,500Form 4
22Hack Andrew A. F.
Director		2025-06-13 17:10:4061,500
0		61,500Form 4
23Dere Willard H
Director		2025-06-13 17:02:4261,500
0		61,500Form 4
24Diaz Allene M.
Director		2025-06-13 17:00:0861,500
0		61,500Form 4
25Protopapas Anna
Director		2025-06-13 16:58:4961,500
0		61,500Form 4
26Hege Kristen
Director		2025-06-13 16:57:2261,500
0		61,500Form 4
27Alleva Lawrence M
Director		2025-06-13 17:15:1261,500
0		61,500Form 4
28Bergstrom Donald A
Chief Medical Officer		2018-02-06 16:24:3556,884
0		56,884Form 4
29Jack Eva M.
Chief Bus. Officer, Tres, Sec.		2020-09-16 18:31:2235,248
0		35,248Form 4
30Kaufman Michael J.
Chief Manufacturing Officer		2021-07-19 20:50:2132,622
0		32,622Form 4
31Foster Wayne
Vice President of Finance		2019-01-25 16:05:0530,750
0		30,750Form 4
32Nayeem Sara M.
Director		2018-01-04 16:31:303,560
0		3,560Form 4
33EcoR1 Capital LLC
10% Owner		2025-05-15 14:16:440
0		0Form 13G
34New Enterprise Associates 14 L.P.
10% Owner		2020-12-10 13:17:310
0		0Form 13D
35New Enterprise Associates 14 L.P.
Sonsini Peter W.
NEA 14 GP LTD
NEA Partners 14 L.P.
BARRIS PETER J
BASKETT FOREST
Florence Anthony A. Jr.
KERINS PATRICK J
SANDELL SCOTT D
10% Owner		2020-12-10 13:17:310
0		0Form 13D
36Jones Elaine V
Director		2017-06-27 19:36:060
0		0Form 3