Ryuichi Isaka has spent more than $25 billion during the past few years to bolster an empire spanning 85,000 convenience stores, gasoline stations and retail outlets. But he wants more.

The chief executive officer of Seven & I Holdings believes that the formula behind the success of 7-Eleven ¡ª the Japanese version, that is ¡ª can be exported across the globe, potentially through acquisitions.

¡°If there¡¯s an opportunity, we¡¯d proactively consider M&A,¡± Isaka said.