Core Insights - HF Sinclair Corp exceeded Wall Street profit estimates for the fourth quarter, driven by increased refining margins [1] - CEO Tim Go announced a voluntary leave of absence, with Franklin Myers temporarily taking over [1] Financial Performance - U.S. refinery margins rose approximately 45% in the fourth quarter compared to the previous year [1] - HF Sinclair's adjusted refinery gross margin increased to $16.28 per barrel, up from $6.68 per barrel a year ago [1] - The refining segment reported an adjusted core profit of $403 million, a significant recovery from a loss of $169 million in the prior year [1] - The company posted an adjusted profit of $1.20 per share, surpassing analysts' average estimate of 45 cents per share [1]