Blackford Quentin S. — SEC Form 4 filings
SEC reporting owner CIK 1612451. 23 Form 4 filings on record with FilingPulse; latest filed 2026-08-31.
Transaction summary — filings shown
Covers all 23 filings on record, filed 2024-02-29 to 2026-08-31. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): 1 leg across 1 filing — 20,000 shares, $256,600 total (shares × price as filed).
- Open-market sales (code S, non-derivative): 18 legs across 10 filings — 185,735 shares, $24,081,372 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 18.
- Largest priced transaction: sale of 25,540 shares @ $135.42 ($3,458,599) in iRhythm Holdings, Inc., filed 2026-02-26.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| iRhythm Holdings, Inc. (IRTC) | President and CEO, Director | 14 | — | 18 legs · 185,735 sh · $24,081,372 | 10 |
| Alphatec Holdings, Inc. (ATEC) | Director | 6 | 1 leg · 20,000 sh · $256,600 | — | 5 |
| Paragon 28, Inc. (FNA) | Director | 2 | — | — | 2 |
| ALIGN TECHNOLOGY INC (ALGN) | Director | 1 | — | — | 1 |
Form 4 filings — Blackford Quentin S.
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-31 | 4 | ALIGN TECHNOLOGY INC (ALGN) | Grant/award (A): 1,376 (derivative) @ $0 | EDGAR |
| 2026-08-11 | 4 | iRhythm Holdings, Inc. (IRTC) | Grant/award (A): 48,534 @ $0 · Sale (S): 26,859 @ $124.65 | EDGAR |
| 2026-06-12 | 4 | Alphatec Holdings, Inc. (ATEC) | Grant/award (A): 32,012 @ $0 | EDGAR |
| 2026-06-01 | 4 | iRhythm Holdings, Inc. (IRTC) | Grant/award (A): 178 @ $96.81 | EDGAR |
| 2026-03-03 | 4 | iRhythm Holdings, Inc. (IRTC) | Sale (S): 4,347 @ $128.44 · Sale (S): 4,043 @ $128.44 · Sale (S): 5,423 @ $128.44 | EDGAR |
| 2026-02-27 | 4 | iRhythm Holdings, Inc. (IRTC) | Grant/award (A): 31,842 @ $0 | EDGAR |
| 2026-02-26 | 4 | iRhythm Holdings, Inc. (IRTC) | Grant/award (A): 46,687 @ $0 · Sale (S): 25,540 @ $135.42 | EDGAR |
| 2025-11-04 | 4 | iRhythm Technologies, Inc. (IRTC) | Sale (S): 14,059 @ $182.94 | EDGAR |
| 2025-08-06 | 4 | iRhythm Technologies, Inc. (IRTC) | Sale (S): 8,726 @ $158.85 · Sale (S): 9,775 @ $160.06 · Sale (S): 4,905 @ $160.73 · Sale (S): 1,600 @ $161.92 · Sale (S): 1,514 @ $163.30 · Sale (S): 3,174 @ $163.93 · +1 more | EDGAR |
| 2025-06-13 | 4 | Alphatec Holdings, Inc. (ATEC) | Grant/award (A): 15,131 @ $0 | EDGAR |
| 2025-06-03 | 4 | iRhythm Technologies, Inc. (IRTC) | Grant/award (A): 297 @ $71.46 | EDGAR |
| 2025-05-06 | 4 | Alphatec Holdings, Inc. (ATEC) | Gift (G): 21,000 @ $0 | EDGAR |
| 2025-04-21 | 4 | Paragon 28, Inc. (FNA) | Disposition to issuer (D): 50,554 | EDGAR |
| 2025-03-04 | 4 | iRhythm Technologies, Inc. (IRTC) | Sale (S): 8,145 @ $108.77 | EDGAR |
| 2025-02-27 | 4 | iRhythm Technologies, Inc. (IRTC) | Grant/award (A): 40,610 @ $0 · Grant/award (A): 38,599 @ $0 · Sale (S): 22,252 @ $112.13 | EDGAR |
| 2024-12-05 | 4 | Alphatec Holdings, Inc. (ATEC) | Gift (G): 15,114 @ $0 | EDGAR |
| 2024-11-05 | 4 | iRhythm Technologies, Inc. (IRTC) | Grant/award (A): 280 @ $74.98 · Sale (S): 16,145 @ $77.41 | EDGAR |
| 2024-06-14 | 4 | Alphatec Holdings, Inc. (ATEC) | Grant/award (A): 16,747 @ $0 | EDGAR |
| 2024-05-21 | 4 | Paragon 28, Inc. (FNA) | Grant/award (A): 15,906 @ $0 | EDGAR |
| 2024-03-08 | 4 | Alphatec Holdings, Inc. (ATEC) | Purchase (P): 20,000 @ $12.83 | EDGAR |
| 2024-03-05 | 4 | iRhythm Technologies, Inc. (IRTC) | Sale (S): 4,221 @ $111.14 | EDGAR |
| 2024-03-01 | 4 | iRhythm Technologies, Inc. (IRTC) | Grant/award (A): 30,938 @ $0 · Sale (S): 24,701 @ $121.96 | EDGAR |
| 2024-02-29 | 4 | iRhythm Technologies, Inc. (IRTC) | Grant/award (A): 45,268 @ $0 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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