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KMX - Carmax Inc

Insider Purchase by Oneil Mark F (Dir)

6 Months
After Trade
Before Trade

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Trade Summary

4 months ago, Oneil Mark F, serving as Dir at Carmax Inc (KMX), purchased 10,816 shares at $46.21 per share, for a total transaction value of $499,807.00. Following this transaction, Oneil Mark F now holds 24,690 shares of KMX.

This purchase represents a 78.00% increase in Oneil Mark F's stake in the company. This is considered a high-conviction trade given the significant change in ownership.

The trade was executed on Thursday, October 2, 2025 and publicly disclosed via SEC Form 4 filing on Monday, October 6, 2025, 4 days after the trade was made.

Carmax Inc operates in the CONSUMER CYCLICAL sector, specifically within the AUTO & TRUCK DEALERSHIPS industry. Insider buying activity in this sector can provide valuable signals about industry trends and company-specific developments.

Oneil Mark F

Dir

Mark F. O'Neil is an independent director on the board of CarMax, Inc. (NYSE: KMX), having joined in October 2019.[[1]](https://investors.carmax.com/news-and-events/news/news-details/2019/Mark-ONeil-Joins-CarMaxs-Board-of-Directors/default.aspx)[[4]](https://investors.carmax.com/governance/board-of-directors/person-details/default.aspx?ItemId=61c5393c-131e-4e0c-a0d1-c84107defbd4)[[6]](https://fintool.com/app/research/companies/KMX/people/mark-oneil) A veteran of the automotive industry, he contributed to the development and rollout of CarMax from 1992 to 2000, serving in various roles including vice president from 1997 to 2000.[[1]](https://investors.carmax.com/news-and-events/news/news-details/2019/Mark-ONeil-Joins-CarMaxs-Board-of-Directors/default.aspx)[[2]](https://www.directorsandboards.com/roster_individual/mark-f-oneil/)[[4]](https://investors.carmax.com/governance/board-of-directors/person-details/default.aspx?ItemId=61c5393c-131e-4e0c-a0d1-c84107defbd4) O'Neil earned a Bachelor of Science in Industrial Engineering from Worcester Polytechnic Institute and an MBA from Harvard Business School, beginning his career at Intel Corporation and McKinsey & Co.[[3]](https://www.coxautoinc.com/wp-content/uploads/2017/07/Mark-ONeil.pdf)[[4]](https://investors.carmax.com/governance/board-of-directors/person-details/default.aspx?ItemId=61c5393c-131e-4e0c-a0d1-c84107defbd4) He later served as President of Ertley MotorWorld in the late 1980s, was President and COO of Greenlight.com (2000-2001), CEO, President (2001-2014), and Chairman (2005-2015) of Dealertrack Technologies, Inc., leading its growth and sale to Cox Automotive in 2015.[[1]](https://investors.carmax.com/news-and-events/news/news-details/2019/Mark-ONeil-Joins-CarMaxs-Board-of-Directors/default.aspx)[[3]](https://www.coxautoinc.com/wp-content/uploads/2017/07/Mark-ONeil.pdf)[[4]](https://investors.carmax.com/governance/board-of-directors/person-details/default.aspx?ItemId=61c5393c-131e-4e0c-a0d1-c84107defbd4)[[5]](https://www.autoremarketing.com/ar/retail/former-cox-auto-coo-oneil-joins-carmax-board/) He then became COO of Cox Automotive from 2016 until retiring in March 2019, overseeing brands like Autotrader and Dealertrack.[[1]](https://investors.carmax.com/news-and-events/news/news-details/2019/Mark-ONeil-Joins-CarMaxs-Board-of-Directors/default.aspx)[[3]](https://www.coxautoinc.com/wp-content/uploads/2017/07/Mark-ONeil.pdf)[[4]](https://investors.carmax.com/governance/board-of-directors/person-details/default.aspx?ItemId=61c5393c-131e-4e0c-a0d1-c84107defbd4)[[6]](https://fintool.com/app/research/companies/KMX/people/mark-oneil)

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Trade Price

$46.21

Quantity

10,816

Total Value

$499,807.00

Shares Owned

24,690

Trade Date

Thursday, October 2, 2025

143 days ago

SEC Filing Date

Monday, October 6, 2025

Filed 4 days after trade

CONSUMER CYCLICALAUTO & TRUCK DEALERSHIPS

About Carmax Inc

Company Overview

No company information available
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