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 Name Report
Date Time		 Shares Owned
Directly
Indirectly		 Total
Shares Owned		 Filing
1 NEXTECH CROSSOVER I SCSP
Nextech Crossover I GP S.a r.l.
Charoub Ian
Constantinides Costas
Sgobbo Rocco
10% Owner		 2024-12-30 16:12:17 12,067,246
0		 12,067,246 Form 3
2 EcoR1 Capital LLC
10% Owner		 2024-12-23 19:50:22 11,578,447
0		 11,578,447 Form 13G
3 BARRETT M JAMES
10% Owner		 2017-07-06 17:16:28 0
8,140,138		 8,140,138 Form 4
4 Viswanathan Ravi
10% Owner		 2017-07-06 17:20:30 0
8,140,138		 8,140,138 Form 4
5 NEA Partners 14 L.P.
NEA 14 GP LTD
10% Owner		 2020-09-16 16:43:08 40,000
7,959,520		 7,999,520 Form 4
6 Florence Anthony A. Jr.
10% Owner		 2020-09-16 16:45:35 4,285
2,080,520		 2,084,805 Form 4
7 BASKETT FOREST
10% Owner		 2020-09-16 16:44:18 0
2,073,464		 2,073,464 Form 4
8 SANDELL SCOTT D
10% Owner		 2020-09-16 16:47:36 0
2,072,194		 2,072,194 Form 4
9 KERINS PATRICK J
10% Owner		 2020-09-16 16:46:35 4,796
2,060,000		 2,064,796 Form 4
10 Sonsini Peter W.
10% Owner		 2020-09-16 16:48:25 993
2,061,192		 2,062,185 Form 4
11 Huber Martin H. Jr.
President, CEO		 2025-01-17 19:21:15 1,153,763
0		 1,153,763 Form 4
12 FMR LLC
See Remark 1		 2018-02-13 09:40:30 884,015
0		 884,015 Form 13G
13 Lowinger Timothy B
SVP, Chief Sci.&Tech. Officer		 2025-01-17 19:25:05 593,090
0		 593,090 Form 4
14 DeSchuytner Brian
SVP, COO & CFO		 2025-01-17 19:20:02 508,893
0		 508,893 Form 4
15 Protopapas Anna
Director		 2025-01-17 19:26:45 168,041
312,507		 480,548 Form 4
16 Bala Mohan
SVP, Chief Development Officer		 2025-01-17 19:18:07 456,372
0		 456,372 Form 4
17 Carvajal Alejandra
SVP, Chief Legal Officer		 2025-01-17 19:18:50 413,713
0		 413,713 Form 4
18 Yang Arvin
SVP, Chief Medical Officer		 2023-01-18 20:29:00 317,903
0		 317,903 Form 4
19 MISRA TUSHAR
SVP, Chief Manuf. Officer		 2024-01-17 17:21:21 271,299
0		 271,299 Form 4
20 Mandelia Ashish
VP, Chief Accounting Officer		 2025-01-17 19:27:39 161,687
0		 161,687 Form 4
21 Huebner Dirk
Chief Medical Officer		 2020-01-16 16:34:44 100,833
0		 100,833 Form 4
22 Spellman David A
Chief Financial Officer		 2019-01-25 16:07:18 100,000
0		 100,000 Form 4
23 Bergstrom Donald A
Chief Medical Officer		 2018-02-06 16:24:35 56,884
0		 56,884 Form 4
24 Dere Willard H
Director		 2024-06-12 16:51:05 55,000
0		 55,000 Form 4
25 Diaz Allene M.
Director		 2024-06-12 16:51:43 55,000
0		 55,000 Form 4
26 Hege Kristen
Director		 2024-06-12 16:52:46 55,000
0		 55,000 Form 4
27 MOTT DAVID M
Director		 2024-06-12 16:53:31 55,000
0		 55,000 Form 4
28 Hack Andrew A. F.
Director		 2024-06-12 17:31:06 55,000
0		 55,000 Form 4
29 Jack Eva M.
Chief Bus. Officer, Tres, Sec.		 2020-09-16 18:31:22 35,248
0		 35,248 Form 4
30 Kaufman Michael J.
Chief Manufacturing Officer		 2021-07-19 20:50:21 32,622
0		 32,622 Form 4
31 Foster Wayne
Vice President of Finance		 2019-01-25 16:05:05 30,750
0		 30,750 Form 4
32 Alleva Lawrence M
Director		 2025-01-03 16:39:05 12,521
0		 12,521 Form 4
33 Nayeem Sara M.
Director		 2018-01-04 16:31:30 3,560
0		 3,560 Form 4
34 New Enterprise Associates 14 L.P.
10% Owner		 2020-12-10 13:17:31 0
0		 0 Form 13D
35 New 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 13:17:31 0
0		 0 Form 13D
36 Jones Elaine V
Director		 2017-06-27 19:36:06 0
0		 0 Form 3