Blackford Quentin S., President and CEO of iRhythm Holdings, Inc. ($IRTC), sold shares on the open market 12 times over the last 365 days, totaling $12.6 million. His most recent sale occurred on March 2, 2026. These sales rank 944th among 11,678 individual insiders in our database, where the average is $8.6 million across about 6.4 transactions. Blackford made no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 2, 2026 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 4043 | $128.44 | 209,578.0000 | 32,316,760 | 1.89% | 0.01% |
| March 2, 2026 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 4347 | $128.44 | 213,621.0000 | 32,316,760 | 1.99% | 0.01% |
| March 2, 2026 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 5423 | $128.44 | 204,155.0000 | 32,316,760 | 2.59% | 0.02% |
| Feb. 25, 2026 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | A | Common Stock | 31842 | $0.00 | 217,968.0000 | 32,316,760 | 17.11% | 0.10% |
| Feb. 24, 2026 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | A | Common Stock | 46687 | $0.00 | 211,666.0000 | 32,316,760 | 28.30% | 0.14% |
| Feb. 25, 2026 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 25540 | $135.42 | 186,126.0000 | 32,316,760 | 12.07% | 0.08% |
| Nov. 3, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 14059 | $182.94 | 164,979.0000 | 32,219,143 | 7.85% | 0.04% |
| Aug. 5, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 4905 | $160.73 | 185,632.0000 | 31,409,617 | 2.57% | 0.02% |
| Aug. 5, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 1600 | $161.92 | 184,032.0000 | 31,409,617 | 0.86% | 0.01% |
| Aug. 5, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 1514 | $163.30 | 182,518.0000 | 31,409,617 | 0.82% | 0.00% |
| Aug. 5, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 3174 | $163.93 | 179,344.0000 | 31,409,617 | 1.74% | 0.01% |
| Aug. 5, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 306 | $165.00 | 179,038.0000 | 31,409,617 | 0.17% | 0.00% |
| Aug. 5, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 9775 | $160.06 | 190,537.0000 | 31,409,617 | 4.88% | 0.03% |
| Aug. 5, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 8726 | $158.85 | 200,312.0000 | 31,409,617 | 4.17% | 0.03% |
| June 11, 2025 | Alphatec Holdings, Inc. | $ATEC | Blackford Quentin S. | Not found | A | Common Stock | 15131 | $0.00 | 568,369.0000 | 142,946,000 | 2.73% | 0.01% |
| May 30, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | A | Common Stock | 297 | $71.46 | 209,038.0000 | 31,409,617 | 0.14% | 0.00% |
| May 5, 2025 | Alphatec Holdings, Inc. | $ATEC | Blackford Quentin S. | Not found | G | Common Stock | 21000 | $0.00 | 553,238.0000 | 142,946,000 | 3.66% | 0.01% |
| March 3, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 8145 | $108.77 | 208,741.0000 | 31,409,617 | 3.76% | 0.03% |
| Feb. 26, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 22252 | $112.13 | 216,886.0000 | 31,409,617 | 9.31% | 0.07% |
| Feb. 26, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | A | Common Stock | 38599 | $0.00 | 239,138.0000 | 31,409,617 | 19.25% | 0.12% |
| Feb. 25, 2025 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | A | Common Stock | 40610 | $0.00 | 200,539.0000 | 31,409,617 | 25.39% | 0.13% |
| Nov. 21, 2024 | Alphatec Holdings, Inc. | $ATEC | Blackford Quentin S. | Not found | G | Common Stock | 15114 | $0.00 | 574,238.0000 | 143,492,000 | 2.56% | 0.01% |
| May 31, 2024 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | A | Common Stock | 280 | $74.98 | 176,074.0000 | 0 | 0.16% | 0.00% |
| Nov. 4, 2024 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 16145 | $77.41 | 159,929.0000 | 0 | 9.17% | 0.00% |
| June 12, 2024 | Alphatec Holdings, Inc. | $ATEC | Blackford Quentin S. | Not found | A | Common Stock | 16747 | $0.00 | 589,352.0000 | 121,242,000 | 2.92% | 0.01% |
| March 7, 2024 | Alphatec Holdings, Inc. | $ATEC | Blackford Quentin S. | Not found | P | Common Stock | 20000 | $12.83 | 572,605.0000 | 121,242,000 | 3.62% | 0.02% |
| March 4, 2024 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 4221 | $111.14 | 175,794.0000 | 0 | 2.34% | 0.00% |
| Feb. 29, 2024 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | S | Common Stock | 24701 | $121.96 | 180,015.0000 | 0 | 12.07% | 0.00% |
| Feb. 28, 2024 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | A | Common Stock | 30938 | $0.00 | 204,716.0000 | 0 | 17.80% | 0.00% |
| Feb. 27, 2024 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | A | Common Stock | 45268 | $0.00 | 173,778.0000 | 0 | 35.23% | 0.00% |
| June 6, 2023 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | P | Common Stock | 9755 | $102.27 | 128,510.0000 | 0 | 8.21% | 0.00% |
| June 20, 2023 | Alphatec Holdings, Inc. | $ATEC | Blackford Quentin S. | Not found | A | Common Stock | 9908 | $0.00 | 552,605.0000 | 103,373,000 | 1.83% | 0.01% |
| June 6, 2023 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | A | Common Stock | 9755 | $102.27 | 128,510.0000 | 0 | 8.21% | 0.00% |
| Feb. 27, 2023 | iRhythm Holdings, Inc. | $IRTC | Blackford Quentin S. | President and CEO | A | Common Stock | 28775 | $0.00 | 118,524.0000 | 0 | 32.06% | 0.00% |