19 out of 16, optical communication takes up several spots on the list—could this be a bet on AI computing infrastructure? That sharp surge late in the session should have been driven by tracking funds scrambling to accumulate positions.

In the late trading on May 29, several stocks quickly surged by more than 2%. O-Film, Stone Technology, and Bull Group fell by more than 2%. On May 13, MSCI released its May review results, which will take effect after the close on the 29th. A total of 19 A-shares will be added and 16 will be removed. The additions include Guangku Technology, Changfei Optical Fiber, Changxin Bochuang, and Baili Tianheng, while the removals include Stone Technology, Shouchuang Securities, and China Communications Signal, among others.