Blackford Quentin S.
Director · Officer · ALGN, IRTC, ATEC, FNA
As of 2026-09-16, Blackford Quentin S. has 29 Form 4 transactions on record across 4 companies — 12 in the trailing 12 months.
Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.
Pattern in the record: open-market sales filed in August in multiple years since 2025 — a recurring calendar cadence, more consistent with scheduled activity than a one-off decision.
Reconstructed holdings
Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.
Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.
Trades by company
Filing ledger
| Date | Company | Action | Shares @ price | Value | Ownership Δ | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-08-10 | IRTC | Sale | 26,859 @ $124.65 | $3.3M | −10.6% of holding | 226,008 | Form 4 |
| 2026-03-02 | IRTC | Sale | 5,423 @ $128.44 | $697K | −2.6% of holding | 204,155 | Form 4 |
| 2026-03-02 | IRTC | Sale | 4,347 @ $128.44 | $558K | −2.0% of holding | 213,621 | Form 4 |
| 2026-03-02 | IRTC | Sale | 4,043 @ $128.44 | $519K | −1.9% of holding | 209,578 | Form 4 |
| 2026-02-25 | IRTC | Sale | 25,540 @ $135.42 | $3.5M | −12.1% of holding | 186,126 | Form 4 |
| 2025-11-03 | IRTC | Sale | 14,059 @ $182.94 | $2.6M | −7.9% of holding | 164,979 | Form 4 |
| 2025-08-05 | IRTC | Sale | 9,775 @ $160.06 | $1.6M | −4.9% of holding | 190,537 | Form 4 |
| 2025-08-05 | IRTC | Sale | 8,726 @ $158.85 | $1.4M | −4.2% of holding | 200,312 | Form 4 |
| 2025-08-05 | IRTC | Sale | 4,905 @ $160.73 | $788K | −2.6% of holding | 185,632 | Form 4 |
| 2025-08-05 | IRTC | Sale | 3,174 @ $163.93 | $520K | −1.7% of holding | 179,344 | Form 4 |
| 2025-08-05 | IRTC | Sale | 1,600 @ $161.92 | $259K | −0.9% of holding | 184,032 | Form 4 |
| 2025-08-05 | IRTC | Sale | 1,514 @ $163.30 | $247K | −0.8% of holding | 182,518 | Form 4 |
| 2025-08-05 | IRTC | Sale | 306 @ $165.00 | $50K | −0.2% of holding | 179,038 | Form 4 |
| 2025-03-03 | IRTC | Sale | 8,145 @ $108.77 | $886K | −3.8% of holding | 208,741 | Form 4 |
| 2025-02-26 | IRTC | Sale | 22,252 @ $112.13 | $2.5M | −9.3% of holding | 216,886 | Form 4 |
14 award / exercise / gift records — not counted as purchases
| Date | Company | Action | Shares | Owned after | Filing |
|---|---|---|---|---|---|
| 2026-08-27 | ALGN | Award / grant | 1,376 | 1,376 | Form 4 |
| 2026-08-07 | IRTC | Award / grant | 48,534 | 252,867 | Form 4 |
| 2026-06-10 | ATEC | Award / grant | 32,012 | 600,381 | Form 4 |
| 2026-05-29 | IRTC | Award / grant | 178 | 204,333 | Form 4 |
| 2026-02-25 | IRTC | Award / grant | 31,842 | 217,968 | Form 4 |
| 2026-02-24 | IRTC | Award / grant | 46,687 | 211,666 | Form 4 |
| 2025-06-11 | ATEC | Award / grant | 15,131 | 568,369 | Form 4 |
| 2025-05-30 | IRTC | Award / grant | 297 | 209,038 | Form 4 |
| 2025-05-05 | ATEC | Gift | 21,000 | 553,238 | Form 4 |
| 2025-04-21 | FNA | Disposition | 50,554 | 0 | Form 4 |
| 2025-04-21 | FNA | Disposition | 50,554 | 0 | Form 4 |
| 2025-02-26 | IRTC | Award / grant | 38,599 | 239,138 | Form 4 |
| 2025-02-25 | IRTC | Award / grant | 40,610 | 200,539 | Form 4 |
| 2024-11-21 | ATEC | Gift | 15,114 | 574,238 | Form 4 |
Source: SEC Form 4 filings. Each row links to its original filing.
Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.