Brunswick Group is handling 7-Eleven’s $21B cash acquisition of the Speedway convenience store chain of Marathon Petroleum.

The addition of 3,900 Speedway units will bolster 7-Eleven’s US and Canada network to about 14,000 stores. 7-Eleven will strengthen its position on the East Coast and Midwest and have a presence in 47 of the top 50 American markets.

7-Eleven, a unit of Japan’s Seven and i Holdings, operates, franchises and/or licenses more than 70,000 convenience stores in 17 countries.

Jonathan Doorley, head of Brunswick’s US M&A team, leads the deal team from New York. He’s supported by NYC partner Charlie Koons, director Kate Beers and Tokyo’s Daisuke Tsuchiya, who heads the firm’s Japan practice.