Blackford Quentin S. (CIK 1612451) reported 24 SEC Form 4 insider transactions across 3 companies over the past 18 months (most recent 2026-06-12). Recent activity: Buy ATEC (32,012 shares), Buy IRTC (178 shares), Sell IRTC (4,347 shares), Sell IRTC (4,043 shares), Sell IRTC (5,423 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-12 | Alphatec Holdings, Inc. (ATEC) | Director | Buy | 32,012 | $0 |
| 2026-06-01 | iRhythm Holdings, Inc. (IRTC) | President and CEO | Buy | 178 | $17,233 |
| 2026-03-03 | iRhythm Holdings, Inc. (IRTC) | President and CEO | Sell | 4,347 | $558,329 |
| 2026-03-03 | iRhythm Holdings, Inc. (IRTC) | President and CEO | Sell | 4,043 | $519,283 |
| 2026-03-03 | iRhythm Holdings, Inc. (IRTC) | President and CEO | Sell | 5,423 | $696,530 |
| 2026-02-27 | iRhythm Holdings, Inc. (IRTC) | President and CEO | Buy | 31,842 | $0 |
| 2026-02-26 | iRhythm Holdings, Inc. (IRTC) | President and CEO | Buy | 46,687 | $0 |
| 2026-02-26 | iRhythm Holdings, Inc. (IRTC) | President and CEO | Sell | 25,540 | $3.5M |
| 2025-11-04 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Sell | 14,059 | $2.6M |
| 2025-08-06 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Sell | 1,600 | $259,072 |
| 2025-08-06 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Sell | 9,775 | $1.6M |
| 2025-08-06 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Sell | 4,905 | $788,381 |
| 2025-08-06 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Sell | 8,726 | $1.4M |
| 2025-08-06 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Sell | 1,514 | $247,236 |
| 2025-08-06 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Sell | 3,174 | $520,314 |
| 2025-08-06 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Sell | 306 | $50,490 |
| 2025-06-13 | Alphatec Holdings, Inc. (ATEC) | Director | Buy | 15,131 | $0 |
| 2025-06-03 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Buy | 297 | $21,224 |
| 2025-05-06 | Alphatec Holdings, Inc. (ATEC) | Director | Sell | 21,000 | $0 |
| 2025-04-21 | Paragon 28, Inc. (FNA) | Director | Sell | 50,554 | $0 |
| 2025-03-04 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Sell | 8,145 | $885,932 |
| 2025-02-27 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Buy | 40,610 | $0 |
| 2025-02-27 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Buy | 38,599 | $0 |
| 2025-02-27 | iRhythm Technologies, Inc. (IRTC) | President and CEO | Sell | 22,252 | $2.5M |
Source: SEC Form 4 filings · as of 2026-06-12