Canadian convenience store chain Alimentation Couche-Tard has reported a 38% rise in third-quarter profit due to higher sales at its expanded US network. The Montreal-based company, which operates under the Couche-Tard, Mac's, Backer's and Dairy Mart banners, said it earned C$14m (US$9.4m) in the quarter to 2 February, compared to $10.2m a year earlier.