Date Press Release Event Transcript 10-Q / 10-K
November 1, 2017 Q3 HollyFrontier Corporation Earnings Release Listen to webcast    
August 2, 2017 Q2 HollyFrontier Corporation Earnings Release Listen to webcast    
May 3, 2017 Q1 HollyFrontier Corporation Earnings Release Listen to webcast Transcript Form 10-Q

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