上證50股指期貨（IH）主力合約失守2900點，日內跌幅0.59%。

UK Maritime Trade Operations said on Aug 18 it received a report that a vessel departing the Strait of Hormuz was struck by an unknown projectile, damaging its engine room; one crew member was injured and may have died. Remaining crew were rescued by the Oman coastguard.

Goldman Sachs trimmed its Thailand 2026 GDP forecast to 1.8% from 1.9% after a sharp second-quarter slowdown, analysts Chris Po and Danny Suwanapruti said. Domestic demand weakened as both private and public consumption fell; private consumption contracted for the first time since Q3 2021, with declines across services and goods. Private investment, roughly two-thirds of total investment, remained resilient but was offset by a large drop in public investment.