SEC Form 4
Quantum-Si Incorporated (QSI) insider trading
In the 12 months to Oct 26, 2026, 2 QSI insiders reported open-market purchases of $564.3K across 2 filings; no open-market sales were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $0
- 0 filings · 0 insiders
- Open-market purchases
- $564.3K
- 2 filings
Who traded QSI, and when
- Purchase
QSI daily close from Oct 27, 2025 to Oct 26, 2026, between $0.70 and $2.34, last $1.43. 0 sale and 2 purchase filings by 2 insiders, marked at their filing dates. Charles R. Kummeth, Director: bought $459.8K across 1 filing, first filed Mar 9, 2026, last Mar 9, 2026. Paula Dowdy, Director: bought $104.5K across 1 filing, first filed Mar 9, 2026, last Mar 9, 2026.
Largest mark · tap a row for others
Charles R. Kummeth · Director
Purchase $459,800
500,000 shares at $0.92 avg
Filed Mar 9, 2026 · traded Mar 5
Close on filing date $0.93
Charles R. Kummeth · Director
Director
$459.8K boughtPaula Dowdy · Director
Director
$104.5K boughtOpen-market trades
2 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Charles R. Kummeth | Director | — | $459.8K | 1 | — | |
| Paula Dowdy | Director | — | $104.5K | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Paula Dowdy Director | Purchase | 109,890 | $0.95 | $104.5K | 269,107 | |
traded | Charles R. Kummeth Director | Purchase | 500,000 | $0.92 | $459.8K | 855,000 |
GET /stocks/filings/vX/form-4?tickers=QSI&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"CAPA",
"QSI"
],
"issuer_cik": "0001816431",
"owner_cik": "0002016312",
"accession_number": "0001140361-26-008320",
"form_type": "4",
"filing_date": "2026-03-09",
"period_of_report": "2026-03-05",
"issuer_name": "Quantum-Si Inc",
"issuer_trading_symbol": "QSI",
"owner_name": "Dowdy Paula",
"is_director": true,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Class A Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-03-05",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 109890,
"transaction_price_per_share": 0.9505,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 269107,
"transaction_value": 104450.445,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "Represents the weighted average purchase price per share. The shares were purchased at prices ranging from $0.9051 to $0.9730 per share. Full information regarding the number of shares purchased at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer."
}
]
},
{
"tickers": [
"CAPA",
"QSI"
],
"issuer_cik": "0001816431",
"owner_cik": "0001534980",
"accession_number": "0001140361-26-008322",
"form_type": "4",
"filing_date": "2026-03-09",
"period_of_report": "2026-03-05",
"issuer_name": "Quantum-Si Inc",
"issuer_trading_symbol": "QSI",
"owner_name": "Kummeth Charles R.",
"is_director": true,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Class A Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-03-05",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 500000,
"transaction_price_per_share": 0.9196,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 855000,
"transaction_value": 459800,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "Represents the weighted average purchase price per share. The shares were purchased at prices ranging from $0.8906 to $0.9735 per share. Full information regarding the number of shares purchased at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer."
}
]
}
]
}
// 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) · 34 records
- Tax withholding (sold to cover)30 records
- Grants and awards4 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.
- 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 Quantum-Si Incorporated's CEO sold stock?
No. Jeffrey Alan Hawkins (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is QSI’s insider data?
These are QSI 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.
Build with AI
Track QSI insider trades with your agent
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 QSI 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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