Verastem's three largest insider shareholders as of September 29, 2026 are Dan Paterson (President And Ceo, 589.94K shares), Brian M Stuglik (Chief Executive Officer, 137.15K shares), Daniel Calkins (Chief Financial Officer, 118.01K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Dan Paterson | President And Ceo | 589,940 | 0 | 589,940 | 43.3% | 05 Aug, 2026 |
| 2 | Brian M Stuglik | Chief Executive Officer | 137,147 | 0 | 137,147 | 10.1% | 26 May, 2026 |
| 3 | Daniel Calkins | Chief Financial Officer | 118,014 | 0 | 118,014 | 8.7% | 23 Sep, 2026 |
| 4 | Michael P Bailey | Director | 108,000 | 0 | 108,000 | 7.9% | 27 May, 2026 |
| 5 | Karin Anna Tollefson | Director | 52,666 | 0 | 52,666 | 3.9% | 26 May, 2026 |
| 6 | Eric K Rowinsky | Director | 52,666 | 0 | 52,666 | 3.9% | 26 May, 2026 |
| 7 | John Johnson | Director | 52,666 | 0 | 52,666 | 3.9% | 26 May, 2026 |
| 8 | Anil Kapur | Director | 52,666 | 0 | 52,666 | 3.9% | 26 May, 2026 |
| 9 | Michelle Robertson | Director | 52,666 | 0 | 52,666 | 3.9% | 26 May, 2026 |
| 10 | Matthew Ros | Chief Operating Officer | 50,000 | 0 | 50,000 | 3.7% | 03 Apr, 2025 |
| 11 | Paul A. Bunn | Director | 44,333 | 0 | 44,333 | 3.3% | 26 May, 2026 |
| 12 | Robert E. Gagnon | Chief Financial Officer | 41,678 | 0 | 41,678 | 3.1% | 18 Dec, 2025 |
| 13 | Michael Kauffman | Director | 8,666 | 0 | 8,666 | 0.6% | 25 Nov, 2025 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 21 Sep, 2026 | Daniel Calkins | Chief Financial Officer | Disposed S | 55 | $7.70 | $424 | 118,014 | Direct |
| 03 Aug, 2026 | Dan Paterson | President And Ceo | Disposed S | 1,302 | $5.81 | $7.56K | 589,940 | Direct |
| 22 Jun, 2026 | Daniel Calkins | Chief Financial Officer | Disposed S | 4,032 | $4.18 | $16.85K | 117,295 | Direct |
| 22 Jun, 2026 | Dan Paterson | President And Ceo | Disposed S | 20,871 | $4.18 | $87.24K | 591,242 | Direct |
| 22 Jun, 2026 | Daniel Calkins | Chief Financial Officer | Disposed S | 57 | $4.13 | $235 | 117,238 | Direct |
| 21 May, 2026 | Michael P Bailey | Director | Acquired A | 108,000 | $0.00 | $0 | 108,000 | Direct |
| 21 May, 2026 | John Johnson | Director | Acquired A | 36,000 | $0.00 | $0 | 52,666 | Direct |
| 21 May, 2026 | Paul A. Bunn | Director | Acquired A | 36,000 | $0.00 | $0 | 44,333 | Direct |
| 21 May, 2026 | Karin Anna Tollefson | Director | Acquired A | 36,000 | $0.00 | $0 | 52,666 | Direct |
| 21 May, 2026 | Brian M Stuglik | Director | Acquired A | 36,000 | $0.00 | $0 | 137,147 | Direct |
| 21 May, 2026 | Eric K Rowinsky | Director | Acquired A | 36,000 | $0.00 | $0 | 52,666 | Direct |
| 21 May, 2026 | Michelle Robertson | Director | Acquired A | 36,000 | $0.00 | $0 | 52,666 | Direct |
| 21 May, 2026 | Anil Kapur | Director | Acquired A | 36,000 | $0.00 | $0 | 52,666 | Direct |
| 04 May, 2026 | Dan Paterson | President And Ceo | Disposed S | 806 | $5.82 | $4.69K | 612,113 | Direct |
| 20 Mar, 2026 | Daniel Calkins | Chief Financial Officer | Disposed A | 57 | $5.74 | $327 | 121,327 | Direct |
| 04 Feb, 2026 | Dan Paterson | President And Ceo | Disposed S | 970 | $6.69 | $6.49K | 612,919 | Direct |
| 21 Jan, 2026 | Daniel Calkins | Chief Financial Officer | Acquired A | 16,665 | $0.00 | $0 | 121,384 | Direct |
| 21 Jan, 2026 | Dan Paterson | President And Ceo | Acquired A | 213,785 | $0.00 | $0 | 613,889 | Direct |
| 12 Jan, 2026 | Daniel Calkins | Chief Financial Officer | Disposed S | 5,039 | $7.16 | $36.08K | 104,719 | Direct |
| 12 Jan, 2026 | Dan Paterson | President And Ceo | Disposed S | 10,321 | $7.16 | $73.90K | 400,104 | Direct |