 DALLAS--BUSINESS WIRE--HollyFrontier Corporation NYSE:HFC HollyFrontier or the Company today reported first quarter net income attributable to HollyFrontier stockholders of 148.2 million, or 0.90 per diluted share, for the quarter ended March 31, 2021, compared to a net loss of 304.6 million, or 1.88 per diluted share, for the quarter ended March 31, 2020. The first quarter results reflect special items that collectively increased net income by a total of 233.5 million. On a 