Latest filingSep 01, 2026Most recent Form 4
QTRX
Quanterix Corp
NasdaqIndustrialsLaboratory Analytical Instruments
Insider activity for last month from 08/03 to 09/03. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$00 sells
Net open-market+$03 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period22transactions
- M · Option exercise · dominant16 · 73%
- F · Tax withholding6 · 27%
Activity by reported role
A joint filing can contribute to multiple roles22transactions
- CTO · dominant18 · 82%
- Director4 · 18%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (3)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeMiller Michael FrancisCommon Stock · Direct
37,409Aug 31, 2026
Miller Michael FrancisRestricted Stock Unit · Direct
0Aug 31, 2026
Donnelly William PRestricted Stock Unit · Direct
0Aug 17, 2026
Donnelly William PCommon Stock · Direct
162,401Aug 17, 2026
Elliott Jeffrey ThomasRestricted Stock Unit · Direct
4,075Aug 19, 2026
Elliott Jeffrey ThomasCommon Stock · Direct
15,345Aug 19, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 03 → Sep 03
LessMore
Top insiders
By absolute net value across the selected period- MF-$1.3k
- ET+$0
- DP+$0
Recent filing activity
Most recent 12 transactions · color = transaction code- MOption exercise09/01$0SEC
- FTax withholding09/01-$12.8kSEC
- MOption exercise09/01—SEC
- MOption exercise08/20$0SEC
- MOption exercise08/20—SEC
- MOption exercise08/19$0SEC
- MOption exercise08/19—SEC
- MOption exercise08/17$0SEC
- MOption exercise08/17$0SEC
- MOption exercise08/17$0SEC
- MOption exercise08/17$0SEC
- MOption exercise08/17$0SEC
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
QTRX transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| QTRX | Miller Michael Francis | CTO | exercise | 159 | $0 | M | 0.0% | 09/01 | 08/31 | |
| QTRX | Miller Michael Francis | CTO | withholding | 48 | -$12.8k | F | 0.0% | 09/01 | 08/31 | |
| QTRX | Miller Michael Francis | CTO | exercise | 159 | — | M | 0.0% | 09/01 | 08/31 | |
| QTRX | Elliott Jeffrey Thomas | DIR | exercise | 3.95k | $0 | M | −19.9% | 08/20 | 08/19 | |
| QTRX | Elliott Jeffrey Thomas | DIR | exercise | 3.95k | — | M | −19.9% | 08/20 | 08/19 | |
| QTRX | DONNELLY WILLIAM P | DIR | exercise | 2.80k | $0 | M | −15.5% | 08/19 | 08/17 | |
| QTRX | DONNELLY WILLIAM P | DIR | exercise | 2.80k | — | M | −15.5% | 08/19 | 08/17 | |
| QTRX | Miller Michael Francis | CTO | exercise | 834 | $0 | M | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | exercise | 372 | $0 | M | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | exercise | 135 | $0 | M | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | exercise | 136 | $0 | M | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | exercise | 81 | $0 | M | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | withholding | 249 | -$64.4k | F | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | exercise | 834 | — | M | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | withholding | 111 | -$28.7k | F | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | exercise | 372 | — | M | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | withholding | 41 | -$10.6k | F | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | exercise | 135 | — | M | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | withholding | 41 | -$10.6k | F | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | exercise | 136 | — | M | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | withholding | 25 | -$6.47k | F | −14.4% | 08/17 | 08/15 | |
| QTRX | Miller Michael Francis | CTO | exercise | 81 | — | M | −14.4% | 08/17 | 08/15 |
Quanterix Corp Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Quanterix Corp?
Miller Michael Francis, Elliott Jeffrey Thomas, DONNELLY WILLIAM P.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
No code-S sale is available for this period.
What is the recent purchase and sale balance?
No code-P purchases or code-S sales were reported in the selected period.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.