Mark F. Oneil
Director · CARMAX INC
IndividualBuying only
- 2025
- Jun 29, 2026
- 4
Filings (90d)
0
Other insiders active in the same stocks
Insiders who reported open-market trades in the last 12 months at the companies Mark F. Oneil files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Keith Barr - $498K in KMX purchases and sales in the last 12 months
- Peter J. Bensen - $131K in KMX purchases and sales in the last 12 months
- Sona Chawla - $107K in KMX purchases and sales in the last 12 months
- Marcella Shinder - $30K in KMX purchases and sales in the last 12 months
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Frequently asked questions
Who is Mark F. Oneil?
Mark F. Oneil is a corporate insider, tracked as Director of CARMAX INC (KMX). InsiderAlpha holds 4 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Mark F. Oneil last file a Form 4?
The most recent primary Form 4 on record is dated 29 June 2026, one of 4 filings going back to 2025.
Has Mark F. Oneil been buying or selling stock?
Recorded transactions: 3 open-market purchases ($1.00M) and 0 open-market sales across all tracked filings.
