William P Donnelly insider trades: Quanterix (QTRX) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where William reports to the SEC
Open-market buys and sales
64 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 13, 2026 | QTRX | ↑ Buy | 99,400 | $2.88 | $286K | Indirect | Aug 14, 2026 (1d) |
| Jun 6, 2025 | QTRX | ↑ Buy | 93,113 | $5.44 | $506K | Direct | Jun 9, 2025 (3d) |
| Sep 8, 2023 | QTRX | ↑ Buy | 20,200 | $24.85 | $502K | Direct | Sep 11, 2023 (3d) |
| Nov 28, 2018 | MTD | ↓ Sell | 3,816 | $606.44 | $2.3M | Direct | Nov 29, 2018 (1d) |
| Nov 26, 2018 | MTD | ↓ Sell | 4,000 | $602.82 | $2.4M | Direct | Nov 27, 2018 (1d) |
| Nov 19, 2018 | MTD | ↓ Sell | 2,500 | $598.20 | $1.5M | Direct | Nov 20, 2018 (1d) |
| Sep 6, 2018 | MTD | ↓ Sell | 2,873 | $586.78 | $1.7M | Direct | Sep 7, 2018 (1d) |
| Aug 31, 2018 | MTD | ↓ Sell | 1,000 | $583.50 | $584K | Direct | Sep 5, 2018 (5d) |
| Aug 29, 2018 | MTD | ↓ Sell | 2,000 | $579.08 | $1.2M | Direct | Aug 31, 2018 (2d) |
| Aug 27, 2018 | MTD | ↓ Sell | 1,000 | $571.50 | $572K | Direct | Aug 29, 2018 (2d) |
| Aug 16, 2018 | MTD | ↓ Sell | 500 | $570.00 | $285K | Direct | Aug 20, 2018 (4d) |
| Aug 9, 2018 | MTD | ↓ Sell | 500 | $585.00 | $293K | Direct | Aug 13, 2018 (4d) |
| Aug 8, 2018 | MTD | ↓ Sell | 1,500 | $587.67 | $882K | Direct | Aug 9, 2018 (1d) |
| Aug 6, 2018 | MTD | ↓ Sell | 3,000 | $590.07 | $1.8M | Direct | Aug 7, 2018 (1d) |
| May 18, 2018 | MTD | ↓ Sell | 3,372 | $564.73 | $1.9M | Direct | May 21, 2018 (3d) |
| May 14, 2018 | MTD | ↓ Sell | 4,000 | $567.85 | $2.3M | Direct | May 16, 2018 (2d) |
| May 11, 2018 | MTD | ↓ Sell | 5,000 | $563.38 | $2.8M | Direct | May 14, 2018 (3d) |
| Feb 14, 2018 | MTD | ↓ Sell | 10,105 | $612.17 | $6.2M | Direct | Feb 14, 2018 (0d) |
| Nov 16, 2017 | MTD | ↓ Sell | 5,000 | $632.14 | $3.2M | Direct | Nov 20, 2017 (4d) |
| Nov 14, 2017 | MTD | ↓ Sell | 10,000 | $630.02 | $6.3M | Direct | Nov 15, 2017 (1d) |
| Aug 7, 2017 | MTD | ↓ Sell | 7,985 | $579.67 | $4.6M | Direct | Aug 9, 2017 (2d) |
| Aug 3, 2017 | MTD | ↓ Sell | 2,845 | $576.92 | $1.6M | Direct | Aug 4, 2017 (1d) |
| May 24, 2017 | GDI | ↑ Buy | 42,642 | $23.37 | $997K | Direct | May 26, 2017 (2d) |
| May 10, 2017 | MTD | ↓ Sell | 5,830 | $550.35 | $3.2M | Direct | May 12, 2017 (2d) |
| May 9, 2017 | MTD | ↓ Sell | 5,000 | $546.18 | $2.7M | Direct | May 10, 2017 (1d) |
| Feb 9, 2017 | MTD | ↓ Sell | 4,830 | $466.47 | $2.3M | Direct | Feb 10, 2017 (1d) |
| Feb 7, 2017 | MTD | ↓ Sell | 6,000 | $464.22 | $2.8M | Direct | Feb 8, 2017 (1d) |
| Nov 8, 2016 | MTD | ↓ Sell | 30,067 | $427.88 | $12.9M | Direct | Nov 9, 2016 (1d) |
| Aug 18, 2016 | MTD | ↓ Sell | 5,033 | $402.11 | $2.0M | Direct | Aug 22, 2016 (4d) |
| Aug 12, 2016 | MTD | ↓ Sell | 10,000 | $403.23 | $4.0M | Direct | Aug 15, 2016 (3d) |
| May 16, 2016 | MTD | ↓ Sell | 2,967 | $370.87 | $1.1M | Direct | May 18, 2016 (2d) |
| May 13, 2016 | MTD | ↓ Sell | 10,783 | $369.85 | $4.0M | Direct | May 16, 2016 (3d) |
| Feb 8, 2016 | MTD | ↓ Sell | 13,750 | $299.63 | $4.1M | Direct | Feb 10, 2016 (2d) |
| Nov 10, 2015 | MTD | ↓ Sell | 15,250 | $327.52 | $5.0M | Direct | Nov 12, 2015 (2d) |
| Aug 10, 2015 | MTD | ↓ Sell | 3,182 | $334.15 | $1.1M | Direct | Aug 12, 2015 (2d) |
| Aug 7, 2015 | MTD | ↓ Sell | 10,518 | $327.64 | $3.4M | Direct | Aug 10, 2015 (3d) |
| Aug 3, 2015 | MTD | ↓ Sell | 1,300 | $337.99 | $439K | Direct | Aug 5, 2015 (2d) |
| May 14, 2015 | MTD | ↓ Sell | 3,782 | $324.20 | $1.2M | Direct | May 15, 2015 (1d) |
| May 12, 2015 | MTD | ↓ Sell | 13,718 | $325.24 | $4.5M | Direct | May 13, 2015 (1d) |
| Feb 11, 2015 | MTD | ↓ Sell | 13,750 | $303.64 | $4.2M | Direct | Feb 12, 2015 (1d) |
| Nov 10, 2014 | MTD | ↓ Sell | 13,750 | $278.70 | $3.8M | Direct | Nov 12, 2014 (2d) |
| Jul 29, 2014 | MTD | ↓ Sell | 13,750 | $261.12 | $3.6M | Direct | Jul 30, 2014 (1d) |
| May 15, 2014 | MTD | ↓ Sell | 12,250 | $241.83 | $3.0M | Direct | May 16, 2014 (1d) |
| May 13, 2014 | MTD | ↓ Sell | 1,500 | $243.50 | $365K | Direct | May 14, 2014 (1d) |
| Feb 11, 2014 | MTD | ↓ Sell | 5,750 | $254.20 | $1.5M | Direct | Feb 13, 2014 (2d) |
| Feb 10, 2014 | MTD | ↓ Sell | 8,000 | $254.78 | $2.0M | Direct | Feb 11, 2014 (1d) |
| Nov 13, 2013 | MTD | ↓ Sell | 13,750 | $240.03 | $3.3M | Direct | Nov 14, 2013 (1d) |
| Jul 30, 2013 | MTD | ↓ Sell | 8,000 | $221.15 | $1.8M | Direct | Jul 31, 2013 (1d) |
| May 8, 2013 | MTD | ↓ Sell | 8,000 | $224.10 | $1.8M | Direct | May 10, 2013 (2d) |
| Feb 11, 2013 | MTD | ↓ Sell | 16,000 | $221.31 | $3.5M | Direct | Feb 12, 2013 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other QTRX insiders
Open-market trades in the last 12 months
About William P Donnelly's insider trades
William P Donnelly is an insider at Quanterix (QTRX). Since Aug 9, 2005, William has reported 4 open-market purchases worth $2.3M and 60 sales worth $147.6M on SEC Form 4. In the last 12 months: 1 buy ($286K).
Their filings also include option exercises (67 filings), grants and awards (53 filings), gifts (4 filings), other transactions (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every QTRX insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.