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Buy VSTM
Verastem Stock Insider Power
Based on the 100 latest insides trades, we have calculated the insider power to be negative at -19.68. In total, the insiders bought 1.15M and sold 132.91K VSTM shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.
Insider Power
|
-19.68 |
| ● Buy | 1.15M shares |
| ● Sell | 132.91K shares |
|
48% Buy Activity
Moderate Negative Correlation
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Historical Insider Trades
| Date | Type | Person | Role | Amount |
|---|---|---|---|---|
|
May 21, 2026 Buy |
Bailey Michael P Director |
108 000 Value: $461.2K |
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May 21, 2026 Buy |
Bailey Michael P |
0 Value: $0 |
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May 21, 2026 Buy |
Johnson John Director |
36 000 Value: $153.7K |
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May 21, 2026 Buy |
Bunn Paul A. Director |
36 000 Value: $153.7K |
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May 21, 2026 Buy |
Kapur Anil Director |
36 000 Value: $153.7K |
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May 21, 2026 Buy |
Robertson Michelle Director |
36 000 Value: $153.7K |
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May 21, 2026 Buy |
Tollefson Karin Anna Director |
36 000 Value: $153.7K |
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May 21, 2026 Buy |
Stuglik Brian M Director |
36 000 Value: $153.7K |
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May 21, 2026 Buy |
Rowinsky Eric K Director |
36 000 Value: $153.7K |
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|
May 04, 2026 Sell |
Paterson Dan President And CEO |
806 Value: $5K |
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Mar 20, 2026 Buy |
Calkins Daniel Chief Financial Officer |
57 Value: $327 |
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Feb 04, 2026 Sell |
Paterson Dan President And CEO |
970 Value: $6K |
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Jan 21, 2026 Buy |
Paterson Dan President And CEO |
213 785 Value: $1.36M |
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Jan 21, 2026 Buy |
Calkins Daniel Chief Financial Officer |
16 665 Value: $106.0K |
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Jan 12, 2026 Sell |
Calkins Daniel Chief Financial Officer |
5 039 Value: $36.1K |
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Jan 12, 2026 Sell |
Paterson Dan President And CEO |
10 321 Value: $73.9K |
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Jan 06, 2026 Buy |
Kauffman Michael President Of Development |
200 000 Value: $1.38M |
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Dec 24, 2025 Sell |
Calkins Daniel Chief Financial Officer |
80 Value: $629 |
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Dec 16, 2025 Sell |
Stuglik Brian M Director |
592 Value: $5K |
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Dec 16, 2025 Sell |
Paterson Dan President And CEO |
393 Value: $4K |
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Dec 16, 2025 Sell |
Gagnon Robert E. Director |
283 Value: $3K |
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Dec 11, 2025 Sell |
Paterson Dan President And CEO |
2 000 Value: $20.0K |
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Dec 10, 2025 Sell |
Paterson Dan President And CEO |
2 000 Value: $20.1K |
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Dec 09, 2025 Sell |
Paterson Dan President And CEO |
2 000 Value: $20.5K |
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Dec 08, 2025 Sell |
Paterson Dan President And CEO |
2 000 Value: $21.0K |
About Insider Power
Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.
It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.
While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.
* October 6th, 2025 - Tested on 5562 stocks
