The Japanese owner of 7-Eleven said Friday it had rejected a takeover bid from retail giant Alimentation Couche-Tard (ACT), saying the proposal "grossly undervalues" the company.

As the world's biggest convenience store chain, 7-Eleven operates more than 85,000 outlets globally.

A letter from the board of Seven & I Holdings to its Canadian rival said it was open to "engaging in sincere discussions should you put forth a proposal that fully recognizes our standalone intrinsic value."