Blackford Quentin S. — SEC Form 4 Insider Trading Activity

Summary

Updated Jul 16, 2026

Blackford Quentin S. has filed 2 SEC Form 4 filings across 2 companies in the last 90 days — selling. Lifetime open-market sales: $11.30M.

Profile

Quentin S. Blackford is the President and CEO of iRhythm Technologies, Inc., a digital healthcare company specializing in cardiac monitoring solutions. He has also held director roles at Alphatec Holdings, Inc., contributing to the growth and innovation in the medical technology sector.

Board memberships

• iRhythm Technologies, Inc.
• Alphatec Holdings, Inc.

Awards & honors

• Leadership in digital healthcare innovation
• Expansion of cardiac monitoring services
• Director roles in notable medical technology companies

Recent Transactions

Companies — Last 90 Days

• Alphatec Holdings, Inc. (ATEC) — 1 filings, last 2026-06-12
• iRhythm Holdings, Inc. (IRTC) — 1 filings, last 2026-06-01

Frequently Asked Questions

Who is Blackford Quentin S.?

Quentin S. Blackford is the President and CEO of iRhythm Technologies, Inc., a digital healthcare company specializing in cardiac monitoring solutions. He has also held director roles at Alphatec Holdings, Inc., contributing to the growth and innovation in the medical technology sector.…

How many SEC Form 4 filings has Blackford Quentin S. submitted recently?

2 primary Form 4 filings in the last 90 days, covering 2 companies.

Has Blackford Quentin S. been buying or selling stock?

Recorded transactions: 0 open-market purchases () and 12 open-market sales ($11.30M) across all tracked filings.

Where can I see all of Blackford Quentin S.'s SEC filings?

All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.

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