SEC Form 4
Quanterix Corporation (QTRX) insider trading
In the 12 months to Oct 24, 2026, 2 QTRX insiders reported open-market purchases of $296.0K 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
- $296.0K
- 2 filings
Who traded QTRX, and when
- Purchase
QTRX daily close from Oct 24, 2025 to Oct 23, 2026, between $2.42 and $8.06, last $2.86. 0 sale and 2 purchase filings by 2 insiders, marked at their filing dates. William P. Donnelly, Director: bought $286.4K across 1 filing, first filed Aug 14, 2026, last Aug 14, 2026. Benjamin Meadows, Chief Commercial Officer: bought $9.7K across 1 filing, first filed Jun 12, 2026, last Jun 12, 2026.
Largest mark · tap a row for others
William P. Donnelly · Director
Purchase $286,354
99,400 shares at $2.88 avg
Filed Aug 14, 2026 · traded Aug 12
Close on filing date $2.59
William P. Donnelly · Director
Director
$286.4K boughtBenjamin Meadows · Chief Commercial Officer
Chief Commercial Officer
$9.7K boughtHas the Quanterix Corporation's CEO sold stock?
No. Everett Cunningham and Masoud Toloue (CEOs) made no open-market sales filed as CEO in the last 12 months.
Open-market trades
2 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| William P. Donnelly | Director | — | $286.4K | 1 | — | |
| Benjamin Meadows | Chief Commercial Officer | — | $9.7K | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | William P. Donnelly Director | Purchase | 99,400 | $2.88 | $286.4K | Multiple accounts | |
traded | Benjamin Meadows Chief Commercial Officer | Purchase | 3,500 | $2.77 | $9.7K | 3,500 |
GET /stocks/filings/vX/form-4?tickers=QTRX&filing_date.gte=2025-10-24&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"QTRX"
],
"issuer_cik": "0001503274",
"owner_cik": "0001207928",
"accession_number": "0001207928-26-000008",
"form_type": "4",
"filing_date": "2026-08-14",
"period_of_report": "2026-08-12",
"issuer_name": "Quanterix Corp",
"issuer_trading_symbol": "QTRX",
"owner_name": "DONNELLY WILLIAM P",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-12",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 27155,
"transaction_price_per_share": 2.75,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 27155,
"transaction_value": 74676.25,
"not_subject_to_section_16": false,
"direct_or_indirect": "I",
"nature_of_ownership": "See footnote",
"footnotes": [
{
"id": "F1",
"description": "The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.58 to $2.95, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."
},
{
"id": "F2",
"description": "Owned jointly by trusts established by the reporting person and his spouse."
}
]
},
{
"tickers": [
"QTRX"
],
"issuer_cik": "0001503274",
"owner_cik": "0001207928",
"accession_number": "0001207928-26-000008",
"form_type": "4",
"filing_date": "2026-08-14",
"period_of_report": "2026-08-12",
"issuer_name": "Quanterix Corp",
"issuer_trading_symbol": "QTRX",
"owner_name": "DONNELLY WILLIAM P",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-13",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 72245,
"transaction_price_per_share": 2.93,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 99400,
"transaction_value": 211677.85,
"not_subject_to_section_16": false,
"direct_or_indirect": "I",
"nature_of_ownership": "See Footnote",
"footnotes": [
{
"id": "F3",
"description": "The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.85 to $3.13, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."
},
{
"id": "F2",
"description": "Owned jointly by trusts established by the reporting person and his spouse."
}
]
}
]
}
// 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) · 157 records
- Option exercises66 records
- Tax withholding71 records
- Grants and awards20 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
Build this yourself
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 QTRX 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.
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.