Thailand's SET Index closed midday down 14.46 points (0.90%) at 1,599.32, pressured by big-cap selloffs (DELTA, AOT, KBANK, GULF). The market lacks clear catalysts and is rotating between sectors. Key risks to monitor: Jackson Hole meeting signals on US Fed policy and FTSE index rebalancing that will downgrade several Thai stocks—though analysts see this as a sentiment-driven correction presenting buying opportunity for fundamentally sound companies.