Mersana Therapeutics, Inc. (MRSN) has 20 known insider and institutional holders on record. The largest holder is NEXTECH CROSSOVER I SCSP with 12,067,246 shares. Other notable holders include EcoR1 Capital, LLC and New Enterprise Associates 14, L.P..
Over the last 12 months, insiders have made 7 transactions in MRSN stock — 7 buys (valued at $154.98K) and 0 sells (valued at RSU Award). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
MRSN Insider Ownership
Top Holder
NEXTECH CROSSOVER I SCSP
12,067,246 shares
Buys (12 mo)
7
$154.98K value
Sells (12 mo)
0
$0.00 value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Nextech Crossover I Scsp |
10 Percent Owner |
12,067,246 |
2024-12-30 |
|
| 2 |
Ecor1 Capital, Llc |
10 Percent Owner |
8,036,688 |
2024-12-23 |
|
| 3 |
New Enterprise Associates 14, L.p. |
10 Percent Owner |
5,959,520 |
2020-09-16 |
|
| 4 |
Lowinger Timothy B |
SVP, Chief Sci.&tech. Officer |
257,673 |
2025-01-17 |
|
| 5 |
Deschuytner Brian |
SVP, COO & CFO |
121,393 |
2025-01-17 |
|
| 6 |
Spellman David A |
Chief Financial Officer |
100,000 |
2019-01-25 |
|
| 7 |
Hege Kristen |
Director |
61,500 |
2025-06-13 |
|
| 8 |
Mott David M |
Director |
61,500 |
2025-06-13 |
|
| 9 |
Dere Willard H |
Director |
61,500 |
2025-06-13 |
|
| 10 |
Hack Andrew A. F. |
Director |
61,500 |
2025-06-13 |
|
| 11 |
Diaz Allene M. |
Director |
61,500 |
2025-06-13 |
|
| 12 |
Protopapas Anna |
Director |
61,500 |
2025-06-13 |
|
| 13 |
Alleva Lawrence M |
Director |
61,500 |
2025-06-13 |
|
| 14 |
Mandelia Ashish |
VP, Chief Accounting Officer |
57,519 |
2025-01-17 |
|
| 15 |
Bergstrom Donald A |
Chief Medical Officer |
56,884 |
2018-02-06 |
|
| 16 |
Yang Arvin |
SVP, Chief Medical Officer |
48,333 |
2023-01-18 |
|
| 17 |
Bala Mohan |
SVP, Chief Development Officer |
43,750 |
2025-01-17 |
|
| 18 |
Kaufman Michael J. |
Chief Manufacturing Officer |
38,934 |
2021-07-19 |
|
| 19 |
Carvajal Alejandra |
SVP, Chief Legal Officer |
37,500 |
2025-01-17 |
|
| 20 |
Huber Martin H. Jr. |
President, CEO |
33,188 |
2025-01-17 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2025-06-12 |
Diaz Allene M. |
Director |
RSU Award |
61,500 |
$0.36 |
$22.14K |
| 2025-06-12 |
Hack Andrew A. F. |
Director |
RSU Award |
61,500 |
$0.36 |
$22.14K |
| 2025-06-12 |
Alleva Lawrence M |
Director |
RSU Award |
61,500 |
$0.36 |
$22.14K |
| 2025-06-12 |
Protopapas Anna |
Director |
RSU Award |
61,500 |
$0.36 |
$22.14K |
| 2025-06-12 |
Dere Willard H |
Director |
RSU Award |
61,500 |
$0.36 |
$22.14K |
| 2025-06-12 |
Hege Kristen |
Director |
RSU Award |
61,500 |
$0.36 |
$22.14K |
| 2025-06-12 |
Mott David M |
Director |
RSU Award |
61,500 |
$0.36 |
$22.14K |
