Important adjustments to the SSE series composite indices take effect tomorrow.

The Shanghai Stock Exchange issued the "Announcement on Revising the Compilation Scheme of the SSE Series Composite Indices" on September 24, stating that after study, the Shanghai Stock Exchange and China Securities Index Co., Ltd. have decided to revise the compilation schemes of certain SSE series composite indices. This revision involves a total of 4 indices, namely the SSE Composite Index, the SSE A Share Index, the SSE Free Float Index, and the STAR Composite Index. The revisions to the compilation schemes of the above indices and their derivative indices will be implemented on October 26, 2026. According to the announcement, the revisions include: (1) adding a weight cap rule limiting the weight of any single constituent to no more than 15%; (2) adjusting the exclusion timing for securities under risk warning from "the next trading day after the second Friday of the month following the date of implementation of the risk warning" to "the next trading day after the second Friday of the month following the date of the risk warning announcement." The remainder of the index compilation schemes remains unchanged. This article is excerpted from the official website of the "SSE", edited by GMTEight: Feng Qiuyi.