HF Sinclair Corporation's stock plummeted 8.79% in pre-market trading following the announcement that its Chief Executive Officer, Tim Go, has taken a voluntary leave of absence and that the company's audit committee is reviewing certain disclosure processes.

The energy refiner stated that board chair Franklin Myers will serve as interim CEO and president while the board determines next steps for the leadership role. The company released its 2025 fourth-quarter and full-year results on an unaudited basis and expects to file its annual report on time, but the disclosure review has introduced uncertainty among investors.

Despite reporting better-than-expected quarterly earnings, with adjusted EPS of $1.20 beating analyst estimates of $0.45, the market reaction was dominated by concerns over the sudden leadership change and the ongoing assessment of disclosure controls. The company did not provide specific details on the nature of the disclosure matters under review.