A major overhaul of the Topix is underway, which will be the largest in its history. The changes will affect hundreds of Japanese stocks. Japan Exchange Group has announced that 683 companies are set to be removed from the index.

This removal is a result of tougher inclusion rules being implemented. The rules aim to refine the composition of the Topix.

Further details about the overhaul and the new inclusion rules can be found through Japan Exchange Group's announcements.