CarMax (KMX) is down about 4% as traders digest an intensifying activist situation and leadership transition. Starboard Value has moved from private engagement to a contested board process, nominating directors for the 2026 annual meeting and pushing for operational changes, while CarMax has publicly responded and indicated it will file proxy materials for the meeting. (wtbx.com)

The setup combines two near-term uncertainty catalysts: (1) a new CEO era—Keith Barr became President and CEO on March 16, 2026—alongside executive compensation and integration details disclosed in SEC filings, and (2) the prospect of a contested vote that can reshape strategy, timelines, and capital allocation. With the annual-meeting process underway, investors are discounting the risk that execution issues persist even if governance changes occur. (stocktitan.net)

Starboard is pressing CarMax to improve digital execution, simplify the online selling/trade-in experience, and reduce costs, arguing the company is underperforming its potential. The activist also disclosed it has taken the fight to the ballot box by nominating two director candidates and communicating directly with management and the board. (wtbx.com)

Next catalysts include CarMax’s late-March earnings-related communications referenced in its prior quarterly materials and any additional SEC filings tied to the proxy contest (including the company’s proxy statement and further activist solicitations). Investors will watch for early signals from Barr on priorities—especially cost discipline and online conversion—plus any acceleration of strategic moves in response to the activism. (media.carmax.com)