David R Walt 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 David reports to the SEC
Open-market buys and sales
378 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Jun 13, 2025 | QTRX | ↑ Buy | 160,000 | $6.16 | $985K | Direct | Jun 13, 2025 (0d) |
| Jun 9, 2025 | QTRX | ↑ Buy | 210,000 | $5.40 | $1.1M | Direct | Jun 9, 2025 (0d) |
| Aug 20, 2024 | QTRX | ↑ Buy | 47,000 | $13.29 | $625K | Direct | Sep 17, 2024 (28d) |
| Aug 10, 2022 | QTRX | ↑ Buy | 150,000 | $8.62 | $1.3M | Direct | Aug 10, 2022 (0d) |
| Mar 13, 2020 | QTRX | ↑ Buy | 54,064 | $16.66 | $901K | Direct | Mar 17, 2020 (4d) |
| Mar 13, 2020 | XCUR | ↑ Buy | 291,066 | $1.21 | $353K | Direct | Mar 16, 2020 (3d) |
| Aug 2, 2019 | XCUR | ↑ Buy | 1,000,000 | $2.00 | $2.0M | Direct | Aug 6, 2019 (4d) |
| Dec 11, 2017 | QTRX | ↑ Buy | 200,000 | $15.00 | $3.0M | Direct | Dec 13, 2017 (2d) |
| Sep 26, 2017 | XCUR | ↑ Buy | 268,333 | $3.00 | $805K | Direct | Sep 28, 2017 (2d) |
| Apr 7, 2016 | ILMN | ↓ Sell10b5-1 | 4,000 | $168.90 | $676K | Direct | Apr 11, 2016 (4d) |
| Mar 15, 2016 | ILMN | ↓ Sell10b5-1 | 4,000 | $149.99 | $600K | Direct | Mar 16, 2016 (1d) |
| Feb 22, 2016 | CERU | ↑ Buy | 2,291 | $2.08 | $5K | Direct | Feb 23, 2016 (1d) |
| Feb 18, 2016 | CERU | ↑ Buy | 8,960 | $2.10 | $19K | Direct | Feb 19, 2016 (1d) |
| Feb 16, 2016 | CERU | ↑ Buy | 8,811 | $2.00 | $18K | Direct | Feb 17, 2016 (1d) |
| Feb 11, 2016 | CERU | ↑ Buy | 8,850 | $2.05 | $18K | Direct | Feb 12, 2016 (1d) |
| Feb 9, 2016 | CERU | ↑ Buy | 9,000 | $2.15 | $19K | Direct | Feb 10, 2016 (1d) |
| Feb 5, 2016 | CERU | ↑ Buy | 8,563 | $2.30 | $20K | Direct | Feb 8, 2016 (3d) |
| Feb 3, 2016 | CERU | ↑ Buy | 8,413 | $2.32 | $20K | Direct | Feb 4, 2016 (1d) |
| Feb 1, 2016 | CERU | ↑ Buy | 5,700 | $2.38 | $14K | Direct | Feb 2, 2016 (1d) |
| Jan 28, 2016 | CERU | ↑ Buy | 9,000 | $2.46 | $22K | Direct | Jan 29, 2016 (1d) |
| Jan 26, 2016 | CERU | ↑ Buy | 8,800 | $2.39 | $21K | Direct | Jan 27, 2016 (1d) |
| Jan 22, 2016 | CERU | ↑ Buy | 9,000 | $2.28 | $21K | Direct | Jan 25, 2016 (3d) |
| Jan 20, 2016 | CERU | ↑ Buy | 8,900 | $2.43 | $22K | Direct | Jan 21, 2016 (1d) |
| Jan 15, 2016 | CERU | ↑ Buy | 8,572 | $2.53 | $22K | Direct | Jan 19, 2016 (4d) |
| Jan 13, 2016 | CERU | ↑ Buy | 8,684 | $2.79 | $24K | Direct | Jan 14, 2016 (1d) |
| Jan 11, 2016 | CERU | ↑ Buy | 8,855 | $2.87 | $25K | Direct | Jan 12, 2016 (1d) |
| Jan 7, 2016 | CERU | ↑ Buy | 8,800 | $2.95 | $26K | Direct | Jan 8, 2016 (1d) |
| Jan 5, 2016 | CERU | ↑ Buy | 8,801 | $3.03 | $27K | Direct | Jan 6, 2016 (1d) |
| Dec 3, 2015 | CERU | ↑ Buy | 10,000 | $3.75 | $37K | Direct | Dec 7, 2015 (4d) |
| Nov 30, 2015 | CERU | ↑ Buy | 5,374 | $3.25 | $17K | Direct | Dec 2, 2015 (2d) |
| Nov 27, 2015 | CERU | ↑ Buy | 12,117 | $3.32 | $40K | Direct | Nov 30, 2015 (3d) |
| Nov 10, 2015 | ILMN | ↓ Sell10b5-1 | 2,000 | $154.03 | $308K | By Spouse | Nov 12, 2015 (2d) |
| Sep 29, 2015 | ILMN | ↓ Sell10b5-1 | 2,000 | $171.65 | $343K | By Spouse | Oct 1, 2015 (2d) |
| Sep 15, 2015 | ILMN | ↓ Sell10b5-1 | 2,000 | $206.45 | $413K | By Spouse | Sep 17, 2015 (2d) |
| Sep 1, 2015 | ILMN | ↓ Sell10b5-1 | 2,000 | $195.08 | $390K | By Spouse | Sep 1, 2015 (0d) |
| Aug 18, 2015 | ILMN | ↓ Sell10b5-1 | 2,000 | $206.89 | $414K | By Spouse | Aug 19, 2015 (1d) |
| Aug 11, 2015 | ILMN | ↓ Sell10b5-1 | 5,497 | $208.69 | $1.1M | Direct | Aug 12, 2015 (1d) |
| Aug 4, 2015 | ILMN | ↓ Sell10b5-1 | 10,000 | $215.03 | $2.2M | Direct | Aug 6, 2015 (2d) |
| Aug 4, 2015 | ILMN | ↓ Sell10b5-1 | 2,000 | $214.99 | $430K | By Spouse | Aug 6, 2015 (2d) |
| Jul 28, 2015 | ILMN | ↓ Sell10b5-1 | 10,000 | $217.29 | $2.2M | Direct | Jul 29, 2015 (1d) |
| Jul 21, 2015 | ILMN | ↓ Sell10b5-1 | 10,000 | $235.24 | $2.4M | Direct | Jul 23, 2015 (2d) |
| Jul 21, 2015 | ILMN | ↓ Sell10b5-1 | 2,000 | $235.23 | $470K | By Spouse | Jul 23, 2015 (2d) |
| Jul 14, 2015 | ILMN | ↓ Sell10b5-1 | 10,000 | $227.39 | $2.3M | Direct | Jul 16, 2015 (2d) |
| Jul 7, 2015 | ILMN | ↓ Sell10b5-1 | 10,000 | $220.22 | $2.2M | Direct | Jul 8, 2015 (1d) |
| Jul 7, 2015 | ILMN | ↓ Sell10b5-1 | 2,000 | $220.16 | $440K | By Spouse | Jul 8, 2015 (1d) |
| Jun 30, 2015 | ILMN | ↓ Sell10b5-1 | 10,000 | $217.64 | $2.2M | Direct | Jun 30, 2015 (0d) |
| Jun 23, 2015 | ILMN | ↓ Sell10b5-1 | 10,000 | $220.09 | $2.2M | Direct | Jun 24, 2015 (1d) |
| Jun 23, 2015 | ILMN | ↓ Sell10b5-1 | 2,000 | $220.17 | $440K | By Spouse | Jun 24, 2015 (1d) |
| Jun 16, 2015 | ILMN | ↓ Sell10b5-1 | 10,000 | $215.14 | $2.2M | Direct | Jun 18, 2015 (2d) |
| Jun 9, 2015 | ILMN | ↓ Sell10b5-1 | 10,000 | $213.48 | $2.1M | Direct | Jun 11, 2015 (2d) |
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 David R Walt's insider trades
David R Walt is an insider at Quanterix (QTRX). Since May 4, 2005, David has reported 29 open-market purchases worth $11.5M and 349 sales worth $113.9M on SEC Form 4. There have been no open-market trades in the last 12 months.
341 sales (97% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include grants and awards (36 filings), option exercises (15 filings), gifts (4 filings), conversions (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.