Quentin S. Blackford is COO & CFO at DEXCOM INC (DXCM). They have made 25 open-market trades across 4 companies since 2014, most recently 2026-08-10.
CIK 0001612451
3 open-market purchases totalling $1.5M since 2019, against 22 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| IRTC | 226,008 | $24.6M |
| ATEC | 600,381 | $6.3M |
| DXCM | 19,280 | $1.7M |
| NUVA | 24,270 | $965K |
| AXGN | 27,335 | $947K |
| FNA | 50,554 | $662K |
| Total | $35.1M |
Shares reported on the most recent Form 4, priced at the 2026-08-11 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| IRTC | SELL | 2026-08-10 | 2026-08-11 | $124.65 | $3.3M | +5.9% | -7.2% | — |
| IRTC | SELL | 2026-03-02 | 2026-03-03 | $128.44 | $1.8M | -10.3% | -7.3% | -13.3% |
| IRTC | SELL | 2026-02-25 | 2026-02-26 | $135.42 | $3.5M | -12.5% | -17.1% | -19.0% |
| IRTC | SELL | 2025-11-03 | 2025-11-04 | $182.94 | $5.1M | -5.8% | +0.0% | -14.1% |
| IRTC | SELL · 10b5-1 | 2025-08-05 | 2025-08-06 | $160.52 | $9.6M | +0.4% | +15.1% | +15.1% |
| IRTC | SELL | 2025-03-03 | 2025-03-04 | $108.77 | $1.8M | -5.4% | -0.5% | +32.2% |
| IRTC | SELL | 2025-02-26 | 2025-02-27 | $112.13 | $5.0M | -0.8% | -0.0% | +35.0% |
| IRTC | SELL | 2024-11-04 | 2024-11-05 | $77.41 | $2.5M | -10.0% | -8.9% | +21.8% |
| ATEC | BUY | 2024-03-07 | 2024-03-08 | $12.83 | $257K | +6.2% | +7.9% | -21.0% |
| IRTC | SELL | 2024-03-04 | 2024-03-05 | $111.14 | $938K | -5.7% | -0.9% | -22.4% |
| IRTC | SELL | 2024-02-29 | 2024-03-01 | $121.96 | $6.0M | -7.6% | +1.9% | -22.3% |
| IRTC | BUY | 2023-06-06 | 2023-12-06 | $102.27 | $998K | +18.3% | +23.7% | +26.2% |
| IRTC | SELL | 2022-11-02 | 2022-11-04 | $122.45 | $3.1M | +2.6% | -1.7% | +6.4% |
| DXCM | SELL | 2021-09-08 | 2021-09-10 | $547.45 | $17.7M | +5.3% | -2.3% | +3.4% |
| DXCM | SELL | 2021-05-28 | 2021-06-01 | $375.00 | $2.7M | +9.5% | +16.8% | +42.8% |
| DXCM | SELL | 2021-03-10 | 2021-03-12 | $362.22 | $4.7M | +0.6% | +9.4% | +12.8% |
| DXCM | SELL | 2020-09-09 | 2020-09-11 | $399.68 | $16.3M | -0.0% | +2.1% | -10.1% |
| DXCM | SELL | 2020-03-11 | 2020-03-13 | $251.65 | $5.2M | +11.3% | +27.1% | +68.7% |
| DXCM | SELL | 2020-03-09 | 2020-03-10 | $261.00 | $233K | -22.8% | +1.5% | +35.9% |
| DXCM | SELL | 2019-09-10 | 2019-09-12 | $141.47 | $2.2M | +5.4% | +10.0% | +45.9% |
| DXCM | SELL | 2019-09-09 | 2019-09-11 | $149.86 | $3.5M | +5.3% | +5.4% | +46.2% |
| AXGN | BUY | 2019-08-09 | 2019-08-13 | $14.01 | $218K | -11.5% | +3.3% | +6.1% |
| DXCM | SELL | 2019-05-29 | 2019-05-30 | $118.95 | $2.1M | +16.4% | +27.3% | +47.2% |
| DXCM | SELL | 2019-03-12 | 2019-03-13 | $142.79 | $1.5M | -15.7% | -19.9% | -5.9% |
| DXCM | SELL | 2018-09-11 | 2018-09-13 | $147.40 | $2.0M | +0.1% | -13.5% | -13.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.