"Following the earthquake incident, the Stock Exchange of Thailand hereby announces the immediate suspension of all trading activities," the bourse operator said on its website.
"The closure affects all markets, including SET, the Market for Alternative Investment (MAI), and the Thailand Futures Exchange (TFEX), for today's afternoon session."
The benchmark SET index was last trading 1.05% lower at an over one-week low of 1,175.45 points. It traded around that level most of the session as stocks remained pressured by new U.S. auto tariffs.
Reuters