Quentin S. Blackford
CIK 1612451 · President and CEO · last filed 2026-06-12
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
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Disclosed Exposure
$43.25M
Companies
6
Total Filings
74
Lifetime Open-Market Net
-$57.84M
Holdings By Company
Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| ATEC | Director | 600,381 | $9.31 | $5.59M | $256.6K | 13 | 2026-06-12 |
| IRTC | President and CEO | 204,333 | $127.84 | $26.12M | -$21.29M | 18 | 2026-06-01 |
| Paragon 28, Inc. (FNA) Delisted | Director | 0 | $13.09 | $0 | $0 | 4 | 2025-04-21 |
| AXGN | Director | 27,335 | $46.43 | $1.27M | $435.3K | 9 | 2022-04-01 |
| DXCM | Chief Operating Officer | 121,212 | $84.75 | $10.27M | -$35.96M | 16 | 2021-09-10 |
| NUVASIVE INC (NUVA) Delisted | CFO | 24,270 | $39.75 | $964.7K | -$1.28M | 13 | 2017-02-10 |
Recent Filings · Page 3 of 8
74 filingsInsider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2024-03-01 | IRTC | Mixed | +6,237 | -$3.01M | EDGAR |
| 2024-02-29 | IRTC | Grant (A) | +45,268 | $0 | EDGAR |
| 2023-12-06 | IRTC | Buy (P) | +9,755 | $997.6K | EDGAR |
| 2023-06-21 | ATEC | Grant (A) | +9,908 | $0 | EDGAR |
| 2023-06-06 | IRTC | Grant (A) | +9,755 | $997.6K | EDGAR |
| 2023-05-19 | Paragon 28, Inc. (FNA) Delisted | Grant (A) | +8,361 | $0 | EDGAR |
| 2023-03-01 | IRTC | Grant (A) | +28,775 | $0 | EDGAR |
| 2022-11-04 | IRTC | Sell (S) | −12,699 | -$1.55M | EDGAR |
| 2022-08-04 | Paragon 28, Inc. (FNA) Delisted | Grant (A) | +16,287 | $300.0K | EDGAR |
| 2022-06-17 | ATEC | Grant (A) | +18,546 | $0 | EDGAR |
Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.