Who
Quentin S. Blackford
Director
Company insider
Files Form 4 as: Director, Align Technology; President and CEO, iRhythm Holdings; Director, Alphatec Holdings; Director, Paragon 28; Director, Axogen; Chief Operating Officer, DexCom; CFO, Nuvasive.
In numbers
- Trades disclosed
- 193
- Buys
- 6
- Sells
- 30
- Bought
- $1.7M
- Sold
- $71.5M
- Companies
- 7
- Companies where not an officer
- 4
- First trade
- 3 Oct 2014
- Last trade
- 27 Aug 2026
- Last filed
- 31 Aug 2026
Companies traded
Activity over time
1 Nov 2024 – 1 Oct 2026
Buys above the line, sells below, each month.
Every trade
| Traded | Company | What | Amount | |
|---|---|---|---|---|
| 27 Aug 2026filed 31 Aug 2026 | ALGN Align Technologyoption or derivative · Medical Devices | SEC FORM 4 Code A | —1,376 at $0.00 | filing |
| 27 Aug 2026filed 31 Aug 2026 | ALGN Align Technologyoption or derivative · Medical Devices | SEC FORM 4 Code A | —1,376 at $0.00 | filing |
| 10 Aug 2026filed 11 Aug 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Sold | $3.3M26,859 at $124.65 | filing |
| 10 Aug 2026filed 11 Aug 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Sold | $3.3M26,859 at $124.65 | filing |
| 7 Aug 2026filed 11 Aug 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Code A | —48,534 at $0.00 | filing |
| 7 Aug 2026filed 11 Aug 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Code A | —48,534 at $0.00 | filing |
| 10 Jun 2026filed 12 Jun 2026 | ATEC Alphatec HoldingsMedical Devices | SEC FORM 4 Code A | —32,012 at $0.00 | filing |
| 10 Jun 2026filed 12 Jun 2026 | ATEC Alphatec HoldingsMedical Devices | SEC FORM 4 Code A | —32,012 at $0.00 | filing |
| 29 May 2026filed 1 Jun 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Code A | $17K178 at $96.82 | filing |
| 29 May 2026filed 1 Jun 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Code A | $17K178 at $96.82 | filing |
| 2 Mar 2026filed 3 Mar 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Sold | $558K4,347 at $128.44 | filing |
| 2 Mar 2026filed 3 Mar 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Sold | $519K4,043 at $128.44 | filing |
| 2 Mar 2026filed 3 Mar 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Sold | $697K5,423 at $128.44 | filing |
| 2 Mar 2026filed 3 Mar 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Sold | $558K4,347 at $128.44 | filing |
| 2 Mar 2026filed 3 Mar 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Sold | $519K4,043 at $128.44 | filing |
| 2 Mar 2026filed 3 Mar 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Sold | $697K5,423 at $128.44 | filing |
| 25 Feb 2026filed 27 Feb 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Code A | —31,842 at $0.00 | filing |
| 25 Feb 2026filed 27 Feb 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Code A | —31,842 at $0.00 | filing |
| 25 Feb 2026filed 26 Feb 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Sold | $3.5M25,540 at $135.42 | filing |
| 25 Feb 2026filed 26 Feb 2026 | IRTC iRhythm HoldingsMedical Devices | SEC FORM 4 Sold | $3.5M25,540 at $135.42 | filing |
News
No headline names them, or the companies they trade most, lately.