BRENTWOOD, Tenn.--(BUSINESS WIRE)--Delek US Holdings, Inc. (NYSE: DK) (“Delek US”) today announced financial results for its second quarter ended June 30, 2015. Delek US reported a second quarter net income of $48.3 million, or $0.79 per diluted share, versus net income of $54.9 million, or $0.92 per diluted share, for the quarter ended June 30, 2014. Operating income in the second quarter 2014 included a one-time non-cash expense of approximately $22.6 million before tax related to the financi