BRENTWOOD, Tenn.--(BUSINESS WIRE)--Delek US Holdings, Inc. (NYSE: DK) today announced that Mark Smith, Executive Vice President of Commercial Operations, and other members of management will participate in the Tudor Pickering Holt Energy Conference in Houston, Texas on Thursday, June 18, 2015. A copy of Delek US’ latest investor presentation will be provided at the conference. An electronic copy of this presentation is currently available in the “Investors” section of the Delek US website at ht