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Quentin S. Blackford

CIK 1612451 · President and CEO · last filed 2026-08-31

Quentin S. Blackford is a President and CEO who has filed 76 SEC Form 4 insider transactions across 7 companies since 2014. The most recent filing, for ALGN, was dated Aug 31, 2026. Across all open-market trades the lifetime net is −$61.2M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $45.6M across reported positions.

"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

$45.60M

Companies

7

Total Filings

76

Lifetime Open-Market Net

-$61.19M

Filer Profile

Reported Address
C/O IRHYTHM TECHNOLOGIES, INC.
699 8TH STREET, STE 600
SAN FRANCISCO, CA 94103
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

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
ALGN Director — $146.84 — $0 1 2026-08-31
IRTC President and CEO 252,867 $109.91 $27.79M -$24.64M 19 2026-08-11
ATEC Director 600,381 $10.12 $6.07M $256.6K 13 2026-06-12
Paragon 28, Inc. (FNA) Delisted Director 0 $13.09 $0 $0 4 2025-04-21
AXGN Director 27,335 $43.56 $1.19M $435.3K 9 2022-04-01
DXCM Chief Operating Officer 121,212 $87.02 $10.55M -$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

76 filings
Insider 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
2026-08-31 ALGN Grant (A) — $0 EDGAR
2026-08-11 IRTC Mixed +21,675 -$3.35M EDGAR
2026-06-12 ATEC Grant (A) +32,012 $0 EDGAR
2026-06-01 IRTC Grant (A) +178 $17.2K EDGAR
2026-03-03 IRTC Sell (S) −13,813 -$1.77M EDGAR
2026-02-27 IRTC Grant (A) +31,842 $0 EDGAR
2026-02-26 IRTC Mixed +21,147 -$3.46M EDGAR
2025-11-04 IRTC Sell (S) −14,059 -$2.57M EDGAR
2025-08-06 IRTC Sell (S) −30,000 -$4.82M EDGAR
2025-08-05 IRTC Notice (144) −30,000 -$4.82M EDGAR
Showing 1–10 of 76
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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.