BP America's national convenience-store brand is ampm, a fully franchised banner on the West Coast. The brand is looking to attract millennial and Gen Z consumers, which is reflected in its testing of bitcoin-enabled ATMs, stocking of CBD snacks and topicals, and its social-media savvy.

The ampm brand's key focus is foodservice, with a program that emphasizes coffee, bakery, fresh sandwiches and hot prepared foods. A large fountain program offers up to 24 varieties of soda and proprietary drinks. Stores have an open floor plan, with some featuring open-air refrigerated cases carrying a selection of fresh sandwiches, fruit and yogurt.

In 2018, BP formed a joint-venture partnership with ArcLight Capital Partners to acquire the privately owned Thorntons Inc. c-store chain. Since then, the newly renamed Thorntons LLC (No. 38 here) has grown to 200 stores, all retaining the Thorntons store and fuel brand. It operates independently from the rest of BP's retail network.

For benchmarking purposes, store counts are as of Jan. 1, 2021.

Headquarters:La Palma, California
No. of Stores:1026
Rank Last Year:8