SEC Form 4
Verastem, Inc. (VSTM) insider trading
In the 12 months to Oct 26, 2026, 6 VSTM insiders reported open-market sales of $1.1M across 22 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $1.1M
- 22 filings · 6 insiders
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 22 of 22
- All $1.1M sold was pre-arranged
Who traded VSTM, and when
- Sale
- Sale, pre-arranged (10b5-1)
VSTM daily close from Oct 27, 2025 to Oct 26, 2026, between $3.45 and $10.64, last $10.03. 22 sale and 0 purchase filings by 6 insiders, marked at their filing dates. Dan Paterson, President and CEO: sold $855.1K across 13 filings, first filed Nov 6, 2025, last Oct 2, 2026. Michael Kauffman, Director: sold $85.5K across 1 filing, first filed Nov 25, 2025, last Nov 25, 2025. Daniel Calkins, Chief Financial Officer: sold $74.7K across 5 filings, first filed Dec 29, 2025, last Oct 2, 2026. Paul A. Bunn, Director: sold $62.5K across 1 filing, first filed Nov 25, 2025, last Nov 25, 2025. Brian M. Stuglik, Director: sold $5.4K across 1 filing, first filed Dec 18, 2025, last Dec 18, 2025. Robert E. Gagnon, Director: sold $2.6K across 1 filing, first filed Dec 18, 2025, last Dec 18, 2025.
Largest mark · tap a row for others
Dan Paterson · President and CEO
Sale $352,968
44,121 shares at $8.00 avg
Filed Oct 2, 2026 · traded Oct 1
Pre-arranged (10b5-1) · close on filing date $7.70
Dan Paterson · President and CEO
President and CEO
$855.1K soldMichael Kauffman · Director
Director
$85.5K soldDaniel Calkins · Chief Financial Officer
Chief Financial Officer
$74.7K soldPaul A. Bunn · Director
Director
$62.5K soldBrian M. Stuglik · Director
Director
$5.4K soldRobert E. Gagnon · Director
Director
$2.6K soldOpen-market trades
22 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Dan Paterson | President and CEO | $855.1K | — | 13 | 100% of sales | |
| Michael Kauffman | Director | $85.5K | — | 1 | 100% of sales | |
| Daniel Calkins | Chief Financial Officer | $74.7K | — | 5 | 100% of sales | |
| Paul A. Bunn | Director | $62.5K | — | 1 | 100% of sales | |
| Brian M. Stuglik | Director | $5.4K | — | 1 | 100% of sales | |
| Robert E. Gagnon | Director | $2.6K | — | 1 | 100% of sales |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Daniel Calkins Chief Financial Officer | SalePre-arranged (10b5-1) | 2,566 | $8.00 | $20.5K | 123,781 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 44,121 | $8.00 | $353.0K | 652,712 | |
traded | Daniel Calkins Chief Financial Officer | SalePre-arranged (10b5-1) | 55 | $7.70 | $424 | 118,014 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 1,302 | $5.81 | $7.6K | 589,940 | |
traded | Daniel Calkins Chief Financial Officer | SalePre-arranged (10b5-1) | 4,089 | $4.18 | $17.1K | 117,295 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 20,871 | $4.18 | $87.2K | 591,242 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 806 | $5.82 | $4.7K | 612,113 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 970 | $6.69 | $6.5K | 612,919 | |
traded | Daniel Calkins Chief Financial Officer | SalePre-arranged (10b5-1) | 5,039 | $7.16 | $36.1K | 104,719 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 10,321 | $7.16 | $73.9K | 400,104 | |
traded | Daniel Calkins Chief Financial Officer | SalePre-arranged (10b5-1) | 80 | $7.86 | $629 | 109,758 | |
traded | Robert E. Gagnon Director | SalePre-arranged (10b5-1) | 283 | $9.14 | $2.6K | 41,678 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 393 | $9.14 | $3.6K | 410,425 | |
traded | Brian M. Stuglik Director | SalePre-arranged (10b5-1) | 592 | $9.14 | $5.4K | 101,147 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 4,000 | $10.04 | $40.1K | 410,818 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 6,000 | $10.45 | $62.7K | 414,818 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 6,000 | $10.11 | $60.6K | 420,818 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 6,000 | $10.50 | $63.0K | 426,818 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 6,000 | $10.00 | $60.0K | 432,818 | |
traded | Michael Kauffman Director | SalePre-arranged (10b5-1) | 8,550 | $10.00 | $85.5K | 8,666 | |
traded | Paul A. Bunn Director | SalePre-arranged (10b5-1) | 6,250 | $10.00 | $62.5K | 2,083 | |
traded | Dan Paterson President and CEO | SalePre-arranged (10b5-1) | 3,299 | $9.74 | $32.1K | 438,818 |
GET /stocks/filings/vX/form-4?tickers=VSTM&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"VSTM"
],
"issuer_cik": "0001526119",
"owner_cik": "0001563202",
"accession_number": "0001104659-26-113362",
"form_type": "4",
"filing_date": "2026-10-02",
"period_of_report": "2026-09-30",
"issuer_name": "Verastem, Inc.",
"issuer_trading_symbol": "VSTM",
"owner_name": "Paterson Dan",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "President and CEO",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-01",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 44121,
"transaction_price_per_share": 8,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 652712,
"transaction_value": 352968,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F2",
"description": "The sale reported on this Form 4 represents shares sold by the Reporting Person to satisfy statutory withholding requirements in connection with the vesting of RSUs."
}
]
},
{
"tickers": [
"VSTM"
],
"issuer_cik": "0001526119",
"owner_cik": "0001951861",
"accession_number": "0001104659-26-113361",
"form_type": "4",
"filing_date": "2026-10-02",
"period_of_report": "2026-09-30",
"issuer_name": "Verastem, Inc.",
"issuer_trading_symbol": "VSTM",
"owner_name": "Calkins Daniel",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Financial Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-01",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 2566,
"transaction_price_per_share": 8,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 123781,
"transaction_value": 20528,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F2",
"description": "The sale reported on this Form 4 represents shares sold by the Reporting Person to satisfy statutory withholding requirements in connection with the vesting of RSUs."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 14 records
- Option exercises1 record
- Grants and awards13 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has Verastem, Inc.'s CEO sold stock?
Yes. Dan Paterson (CEO) sold 110,083 shares ($855.1K) between Nov 2025 and Oct 2026, all under a pre-arranged 10b5-1 plan.
How current is VSTM’s insider data?
These are VSTM Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for VSTM every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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