Robinson Oil Corp.

Operating retail under the Rotten Robbie brand, Robinson Oil owns stores centered in northern California, with stores varying in size from small kiosks to larger units with a full selection of core c-store products. 

While its store count stands at 38, officials expect a new store to come online this year. The chain functions as an independent, private-brand marketer, with most stores in the San Francisco Bay Area.

The company's strategy leans toward selling a high volume of fuel at competitive prices, a tactic also used with cigarettes and energy drinks. 

For benchmarking purposes, store counts are as of Jan. 1, 2025.