| Insiders | Shares | % | Avg Price | Total $ | |
|---|---|---|---|---|---|
| Buys | 0 | ||||
| Sells | 6 | -169,790 | 100% | $8.21 | -$1,393,337 |
| Net | -6 | -169,790 | -100% | -$1,393,337 |
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Report Date |
|---|---|---|---|---|---|
| BVF PARTNERS L P/IL | 10%+ Owner | $10,888,165 | 25 Jan 2022 | ||
| Dan Paterson | President and CEO, Director | $4,100,428 | -$992,234 | -19% | 04 Feb 2026 |
| Daniel Calkins | Chief Financial Officer | $937,060 | -$149,882 | -14% | 21 Jan 2026 |
| Brian M. Stuglik | Director | $924,483 | -$18,752 | -2% | 16 Dec 2025 |
| Robert E. Gagnon | Director | $380,936 | -$8,972 | -2.3% | 16 Dec 2025 |
| Matthew Ros | Chief Operating Officer | $352,000 | 01 Apr 2025 | ||
| John Johnson | Director | $116,495 | 22 May 2025 | ||
| Karin Anna Tollefson | Director | $116,495 | 22 May 2025 | ||
| Michelle Robertson | Director | $116,495 | 22 May 2025 | ||
| Anil Kapur | Director | $116,495 | 22 May 2025 | ||
| Eric K. Rowinsky | Director | $116,495 | 22 May 2025 | ||
| Michael Kauffman | President of Development, Director | $86,660 | -$85,500 | -50% | 06 Jan 2026 |
| Paul A. Bunn | Director | $27,248 | -$137,997 | -84% | 21 Nov 2025 |
| Timothy J. Barberich | Director | 28 Jun 2021 | |||
| Lesley Kim Solomon | Director | 22 Jun 2022 | |||
| Gina Consylman | Director | 28 Jun 2021 |
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Dan Paterson | VSTM | Common Stock | Sale | -0.16% | $6,489 | $6.69 | -970 | 612,919 | 04 Feb 2026 | Direct |
| Daniel Calkins | VSTM | Common Stock | Award | 15.9% | 16,665 | 121,384 | 21 Jan 2026 | Direct | ||
| Dan Paterson | VSTM | Common Stock | Award | 53.4% | 213,785 | 613,889 | 21 Jan 2026 | Direct | ||
| Dan Paterson | VSTM | Common Stock | Sale | -2.51% | $73,898 | $7.16 | -10,321 | 400,104 | 12 Jan 2026 | Direct |
| Daniel Calkins | VSTM | Common Stock | Sale | -4.59% | $36,079 | $7.16 | -5,039 | 104,719 | 12 Jan 2026 | Direct |
| Michael Kauffman | VSTM | Stock Option (right to buy) | Award | 200,000 | 200,000 | 06 Jan 2026 | Direct | |||
| Daniel Calkins | VSTM | Common Stock | Sale | -0.07% | $629 | $7.86 | -80 | 109,758 | 24 Dec 2025 | Direct |
| Brian M. Stuglik | VSTM | Common Stock | Sale | -0.58% | $5,411 | $9.14 | -592 | 101,147 | 16 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.1% | $3,592 | $9.14 | -393 | 410,425 | 16 Dec 2025 | Direct |
| Robert E. Gagnon | VSTM | Common Stock | Sale | -0.67% | $2,587 | $9.14 | -283 | 41,678 | 16 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.48% | $20,000 | $10.00 | -2,000 | 410,818 | 11 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.48% | $20,140 | $10.07 | -2,000 | 412,818 | 10 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.48% | $20,500 | $10.25 | -2,000 | 414,818 | 09 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.48% | $21,000 | $10.50 | -2,000 | 416,818 | 08 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.48% | $21,220 | $10.61 | -2,000 | 418,818 | 05 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.47% | $20,000 | $10.00 | -2,000 | 420,818 | 04 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.47% | $20,000 | $10.00 | -2,000 | 422,818 | 03 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.47% | $20,640 | $10.32 | -2,000 | 424,818 | 02 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.47% | $20,780 | $10.39 | -2,000 | 426,818 | 01 Dec 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.46% | $21,580 | $10.79 | -2,000 | 428,818 | 28 Nov 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.46% | $20,640 | $10.32 | -2,000 | 430,818 | 26 Nov 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.46% | $20,000 | $10.00 | -2,000 | 432,818 | 25 Nov 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.46% | $20,000 | $10.00 | -2,000 | 434,818 | 24 Nov 2025 | Direct |
| Paul A. Bunn | VSTM | Common Stock | Options Exercise | 300% | 6,250 | 8,333 | 21 Nov 2025 | Direct | ||
| Paul A. Bunn | VSTM | Common Stock | Sale | -75% | $62,500 | $10.00 | -6,250 | 2,083 | 21 Nov 2025 | Direct |
| Paul A. Bunn | VSTM | Stock Options (right to buy) | Options Exercise | -50% | -6,250 | 6,250 | 21 Nov 2025 | Direct | ||
| Michael Kauffman | VSTM | Common Stock | Sale | -49.7% | $85,500 | $10.00 | -8,550 | 8,666 | 21 Nov 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.46% | $20,000 | $10.00 | -2,000 | 436,818 | 21 Nov 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.75% | $32,146 | $9.74 | -3,299 | 438,818 | 03 Nov 2025 | Direct |
| Paul A. Bunn | VSTM | Common Stock | Sale | -50% | $75,497 | $9.06 | -8,333 | 8,333 | 09 Oct 2025 | Direct |
| Daniel Calkins | VSTM | Common Stock | Sale | -0.02% | $231 | $9.23 | -25 | 109,838 | 24 Sep 2025 | Direct |
| Daniel Calkins | VSTM | Common Stock | Sale | -0.05% | $518 | $9.08 | -57 | 109,863 | 22 Sep 2025 | Direct |
| Brian M. Stuglik | VSTM | Common Stock | Sale | -0.57% | $5,864 | $9.99 | -587 | 101,739 | 16 Sep 2025 | Direct |
| Robert E. Gagnon | VSTM | Common Stock | Sale | -0.67% | $2,807 | $9.99 | -281 | 41,961 | 16 Sep 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.09% | $3,896 | $9.99 | -390 | 442,117 | 16 Sep 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.3% | $7,739 | $5.81 | -1,332 | 442,507 | 06 Aug 2025 | Direct |
| Daniel Calkins | VSTM | Common Stock | Sale | -0.02% | $118 | $4.71 | -25 | 109,920 | 23 Jun 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -3.86% | $91,355 | $5.13 | -17,808 | 443,839 | 20 Jun 2025 | Direct |
| Daniel Calkins | VSTM | Common Stock | Sale | -3.6% | $21,084 | $5.13 | -4,110 | 109,945 | 20 Jun 2025 | Direct |
| Dan Paterson | VSTM | Common Stock | Sale | -0.07% | $1,893 | $5.65 | -335 | 461,647 | 16 Jun 2025 | Direct |
| Robert E. Gagnon | VSTM | Common Stock | Sale | -0.67% | $1,605 | $5.65 | -284 | 42,242 | 16 Jun 2025 | Direct |
| Brian M. Stuglik | VSTM | Common Stock | Sale | -0.58% | $3,356 | $5.65 | -594 | 102,326 | 16 Jun 2025 | Direct |
| Michelle Robertson | VSTM | Common Stock | Award | 100% | 8,333 | 16,666 | 22 May 2025 | Direct | ||
| Michelle Robertson | VSTM | Stock Option (right to buy) | Award | 12,500 | 12,500 | 22 May 2025 | Direct | |||
| Paul A. Bunn | VSTM | Common Stock | Award | 100% | 8,333 | 16,666 | 22 May 2025 | Direct | ||
| Paul A. Bunn | VSTM | Stock Option (right to buy) | Award | 12,500 | 12,500 | 22 May 2025 | Direct | |||
| Anil Kapur | VSTM | Common Stock | Award | 100% | 8,333 | 16,666 | 22 May 2025 | Direct | ||
| Anil Kapur | VSTM | Stock Option (right to buy) | Award | 12,500 | 12,500 | 22 May 2025 | Direct | |||
| Brian M. Stuglik | VSTM | Common Stock | Award | 8.81% | 8,333 | 102,920 | 22 May 2025 | Direct | ||
| Brian M. Stuglik | VSTM | Stock Option (right to buy) | Award | 12,500 | 12,500 | 22 May 2025 | Direct |