Blackford Quentin S. insider trades
Blackford Quentin S. has filed 34 Form 4s with the SEC that we hold, for iRhythm Holdings, Inc. (IRTC) (President and CEO, Director), Alphatec Holdings, Inc. (ATEC) (Director), FNA (Director) and Align Technology INC (ALGN) (Director), among 6 companies in all. Across all of them we count 2 purchases worth $1.3M and 34 sales worth $35.9M reported on Form 4. In the last 12 months: 0 purchases ($0) and 6 sales ($11.2M). The largest single trade was a sale of 7,639 shares of Dexcom INC worth $4.2M, dated 2021-09-08. The first filing on our record is dated 2021-09-10 and the latest 2026-08-31.
iRhythm Holdings, Inc. (IRTC)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2022-11-02 | S, sale reported on Form 4 | 284 | $33.6K | 2022-11-04 |
| 2022-11-02 | S, sale reported on Form 4 | 12,415 | $1.5M | 2022-11-04 |
| 2023-06-06 | P, purchase reported on Form 4 | 9,755 | $997.6K | 2023-12-06 |
| 2024-02-29 | S, sale reported on Form 4 | 24,701 | $3.0M | 2024-03-01 |
| 2024-03-04 | S, sale reported on Form 4 | 4,221 | $469.1K | 2024-03-05 |
| 2024-11-04 | S, sale reported on Form 4 | 16,145 | $1.2M | 2024-11-05 |
| 2025-02-26 | S, sale reported on Form 4 | 22,252 | $2.5M | 2025-02-27 |
| 2025-03-03 | S, sale reported on Form 4 | 8,145 | $885.9K | 2025-03-04 |
| 2025-08-05 | S, sale reported on Form 4 | 9,775 | $1.6M | 2025-08-06 |
| 2025-08-05 | S, sale reported on Form 4 | 306 | $50.5K | 2025-08-06 |
| 2025-08-05 | S, sale reported on Form 4 | 1,600 | $259.1K | 2025-08-06 |
| 2025-08-05 | S, sale reported on Form 4 | 1,514 | $247.2K | 2025-08-06 |
| 2025-08-05 | S, sale reported on Form 4 | 3,174 | $520.3K | 2025-08-06 |
| 2025-08-05 | S, sale reported on Form 4 | 8,726 | $1.4M | 2025-08-06 |
| 2025-08-05 | S, sale reported on Form 4 | 4,905 | $788.4K | 2025-08-06 |
| 2025-11-03 | S, sale reported on Form 4 | 14,059 | $2.6M | 2025-11-04 |
| 2026-02-25 | S, sale reported on Form 4 | 25,540 | $3.5M | 2026-02-26 |
| 2026-03-02 | S, sale reported on Form 4 | 4,043 | $519.3K | 2026-03-03 |
| 2026-03-02 | S, sale reported on Form 4 | 5,423 | $696.5K | 2026-03-03 |
| 2026-03-02 | S, sale reported on Form 4 | 4,347 | $558.3K | 2026-03-03 |
| 2026-08-10 | S, sale reported on Form 4 | 26,859 | $3.3M | 2026-08-11 |
Alphatec Holdings, Inc. (ATEC)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2024-03-07 | P, purchase reported on Form 4 | 20,000 | $256.6K | 2024-03-08 |
FNA
No purchase or sale of common stock reported here; these filings cover grants, option exercises or other codes.
Align Technology INC (ALGN)
No purchase or sale of common stock reported here; these filings cover grants, option exercises or other codes.
Axogen, Inc. (AXGN)
No purchase or sale of common stock reported here; these filings cover grants, option exercises or other codes.
Dexcom INC (DXCM)
| Trade date | Code | Shares | Value as filed | Filed |
|---|---|---|---|---|
| 2021-09-08 | S, sale reported on Form 4 | 42 | $22.9K | 2021-09-10 |
| 2021-09-08 | S, sale reported on Form 4 | 7,639 | $4.2M | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 515 | $278.8K | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 300 | $162.8K | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 19 | $10.3K | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 1,534 | $830.4K | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 100 | $54.4K | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 100 | $54.5K | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 900 | $492.6K | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 1,200 | $658.1K | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 2,394 | $1.3M | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 2,200 | $1.2M | 2021-09-10 |
| 2021-09-09 | S, sale reported on Form 4 | 200 | $110.3K | 2021-09-10 |
| 2021-09-10 | S, sale reported on Form 4 | 1,519 | $848.1K | 2021-09-10 |
Counted from the Form 4 filings this reporting owner (SEC CIK 1612451) filed on EDGAR. Values are the transaction values as filed. See every filing on EDGAR, or browse insider buying and today's insider purchases.
Source: U.S. Securities and Exchange Commission (EDGAR) and other official
government data · Updated 2026-10-12 ·
For informational purposes only, not investment advice.
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