Major Stock Index Adjustments for A-Shares and HK Stocks Take Effect Today

A series of significant index adjustments across mainland China and Hong Kong stock exchanges took effect on September 14, 2026, according to official reports from financial outlets including Sina Finance and Guangzhou Daily. The changes impact several major market benchmarks, altering constituent stocks for the CSI Science and Technology Innovation Board 50 Index, commonly known as the STAR 50, alongside adjustments for the Beijing Stock Exchange’s BSE 50 index and various mainland and Hong Kong composite trackers.

STAR 50 Index Adds Five New Companies

The STAR 50 index officially welcomed five new companies into its sample pool on September 14, 2026, according to reporting by Securities Market Weekly. The adjustments reflect ongoing portfolio rebalancing designed to capture shifts in the hard technology and advanced manufacturing sectors on the Shanghai Stock Exchange’s STAR Market. Exchange data cited by financial media indicates that the newly included firms align with strategic national technology directives.

Index providers routinely review constituent selections to ensure benchmarks accurately represent sector performance and market capitalization trends. Market observers note that periodic component updates often trigger portfolio adjustments among exchange-traded funds and institutional tracking portfolios that benchmark against the STAR 50.

BSE 50 and Broader Market Benchmark Rebalancing

Simultaneously, composite indices tracking mainland and Hong Kong equities implemented scheduled constituent changes on September 14, 2026, as detailed by Sina Finance and East Money. The Beijing Stock Exchange also enacted its official sample stock adjustments for the BSE 50 index on the same date.

These multi-market index revisions highlight the ongoing mechanisms used by index compilers to maintain liquidity and representation standards across China’s primary trading venues. Detailed lists of incoming and outgoing constituents for each affected benchmark have been published through official exchange channels for institutional investors and market participants.