US Refinery Gains $34 Billion in Market Cap in One Day

Delek US Holdings, Inc. (NYSE: DK) recently jumped 8.57% on the New York Stock Exchange, closing at $45.97. Its market capitalization rose to about $2.75 billion—an increase of roughly $260 million in a single day—on trading volume of approximately 1.05 million shares.

At its February 19 board meeting, Delek US approved a quarterly dividend of $0.255 per share, which was paid in cash to shareholders on March 9. The company also released its fourth-quarter and full-year 2025 results, updating investors on refining and logistics performance, financial structure, and future investment plans. Meanwhile, the Big Spring refinery in Texas entered a planned maintenance turnaround in early February, curtailing operations through the end of March.

Headquartered in Brentwood, Tennessee, Delek US Holdings is a downstream energy company operating four refineries—in Tyler and Big Spring, Texas; El Dorado, Arkansas; and Krotz Springs, Louisiana—with a combined capacity of about 300,000 barrels per day. Founded in 2001 as a subsidiary of Israel’s Delek Group, the company has grown into a mid-sized refiner supplying gasoline and diesel to the U.S. South and inland markets through its refining, logistics, and biofuels businesses.