Verastem, Inc. (VSTM) has 20 known insider and institutional holders on record. The largest holder is RA CAPITAL MANAGEMENT, L.P. with 16,142,051 shares. Other notable holders include CLARKE JOHN K and CHP III LP.
Over the last 12 months, insiders have made 55 transactions in VSTM stock — 12 buys (valued at $2.22M) and 40 sells (valued at $1.37M). Insider selling has exceeded buying during this period.
VSTM Insider Ownership
Top Holder
RA CAPITAL MANAGEMENT, L.P.
16,142,051 shares
Buys (12 mo)
12
$2.22M value
Sells (12 mo)
40
$1.37M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Ra Capital Management, L.p. |
10 Percent Owner |
16,142,051 |
2020-06-29 |
|
| 2 |
Clarke John K |
Director |
2,329,121 |
2013-06-13 |
|
| 3 |
Chp Iii Lp |
10 Percent Owner |
2,305,950 |
2013-06-13 |
|
| 4 |
Longwood Fund, L.p. |
10 Percent Owner |
1,869,877 |
2014-01-27 |
|
| 5 |
Bvf Partners L P/il |
10 Percent Owner |
994,353 |
2022-02-07 |
|
| 6 |
Westphal Christoph H |
Executive Chairman |
665,224 |
2015-07-01 |
|
| 7 |
Paterson Dan |
President and CEO |
612,919 |
2026-02-05 |
|
| 8 |
Gupta Piyush |
10 Percent Owner |
442,857 |
2012-01-26 |
|
| 9 |
Weinberg Robert A |
10 Percent Owner |
363,442 |
2012-01-26 |
|
| 10 |
Lander Eric S |
10 Percent Owner |
358,892 |
2012-01-26 |
|
| 11 |
Forrester Robert |
President and CEO |
240,000 |
2019-01-07 |
|
| 12 |
Kauffman Michael |
President of Development |
200,000 |
2026-01-08 |
|
| 13 |
Berk Gregory |
Chief Medical Officer |
150,000 |
2017-01-11 |
|
| 14 |
Neumann Frank |
Chief Medical Officer |
150,000 |
2021-01-08 |
|
| 15 |
Calkins Daniel |
Chief Financial Officer |
121,327 |
2026-03-23 |
|
| 16 |
Stuglik Brian M |
Director |
101,147 |
2025-12-18 |
|
| 17 |
Horobin Joanna |
Chief Medical Officer |
100,118 |
2015-01-12 |
|
| 18 |
Solomon Lesley Kim |
Director |
62,500 |
2022-12-20 |
|
| 19 |
Lobacki Joseph M |
Executive VP & Cco |
62,500 |
2019-01-07 |
|
| 20 |
Pachter Jonathan |
VP, Head of Research |
62,249 |
2014-08-05 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-20 |
Calkins Daniel |
Chief Financial Officer |
RSU Award (Return) |
57 |
$5.74 |
$327.18 |
| 2026-02-04 |
Paterson Dan |
President and CEO |
Informative Sell |
970 |
$6.69 |
$6.49K |
| 2026-01-21 |
Calkins Daniel |
Chief Financial Officer |
RSU Award |
16,665 |
- |
- |
| 2026-01-21 |
Paterson Dan |
President and CEO |
RSU Award |
213,785 |
- |
- |
| 2026-01-12 |
Calkins Daniel |
Chief Financial Officer |
Informative Sell |
5,039 |
$7.16 |
$36.08K |
| 2026-01-12 |
Paterson Dan |
President and CEO |
Informative Sell |
10,321 |
$7.16 |
$73.9K |
| 2026-01-06 |
Kauffman Michael |
President of Development |
RSU Award |
200,000 |
$6.88 |
$1.38M |
| 2025-12-24 |
Calkins Daniel |
Chief Financial Officer |
Informative Sell |
80 |
$7.86 |
$628.80 |
| 2025-12-16 |
Stuglik Brian M |
Director |
Informative Sell |
592 |
$9.14 |
$5.41K |
| 2025-12-16 |
Paterson Dan |
President and CEO |
Informative Sell |
393 |
$9.14 |
$3.59K |
| 2025-12-16 |
Gagnon Robert E. |
Director |
Informative Sell |
283 |
$9.14 |
$2.59K |
| 2025-12-11 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.00 |
$20K |
| 2025-12-10 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.07 |
$20.14K |
| 2025-12-09 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.25 |
$20.5K |
| 2025-12-08 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.50 |
$21K |
| 2025-12-05 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.61 |
$21.22K |
| 2025-12-04 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.00 |
$20K |
| 2025-12-03 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.00 |
$20K |
| 2025-12-02 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.32 |
$20.64K |
| 2025-12-01 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.39 |
$20.78K |
| 2025-11-28 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.79 |
$21.58K |
| 2025-11-26 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.32 |
$20.64K |
| 2025-11-21 |
Bunn Paul A. |
Director |
Informative Sell |
6,250 |
$10.00 |
$62.5K |
| 2025-11-25 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.00 |
$20K |
| 2025-11-24 |
Paterson Dan |
President and CEO |
Informative Sell |
2,000 |
$10.00 |
$20K |
