The S&P 500 Oil & Gas Refining & Marketing Index has climbed 108% over the past
12 months to about 3,250, near record highs. The index tracks large U.S.
refiners, marketers and transporters. This is the biggest 12-month gain since
the post-2020 recovery; only 2013 and 2005 produced comparable 30-year
performances. Refining and marketing stocks are up 175% since April 2025, and
markets are positioning for a strong upswing in U.S. refining.