SSE implements revised Shanghai composite index methodology from Aug 26

The single-constituent weight cap is a structural change to how the Shanghai Composite and its siblings are constructed, but its practical effect depends entirely on whether any constituent was actually approaching that threshold — a detail the notice does not address. The faster removal of risk-warning securities is the more consequential tweak for index-tracking products, since it shortens the window in which flagged names linger in the benchmark. Whether the revised methodology meaningfully shifts index behavior, or turns out to be largely housekeeping, is the open question worth watching as the next rebalance cycles play out.