SemGroup was a midstream service provider that gathered, transported, stored, processed, and marketed crude oil, refined products, and natural gas liquids before being acquired by Energy Transfer.
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Updated
Apr 7, 2026
SemGroup was a midstream service provider that gathered, transported, stored, processed, and marketed crude oil, refined products, and natural gas liquids before being acquired by Energy Transfer.
HollyFrontier was an independent petroleum refiner and marketer that produced and marketed gasoline, diesel fuel, jet fuel, asphalt, and specialty lubricant products before becoming HF Sinclair.
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