The SET Index (SET) fell 0.9 percent to 1,189.22, headed for the largest decrease since June 21.
Oil companies: PTT Pcl (PTT) , Thailand’s largest energy company, dropped 1.2 percent to 330 baht, on course for the steepest decline since June 25. PTT Exploration & Production Pcl (PTTEP) , the country’s only publicly traded oil explorer, lost 1.1 percent to 175 baht.
Crude oil slid 3.2 percent on the New York Mercantile Exchange on July 6, the biggest decline since June 21.
Bangchak Petroleum Pcl (BCP) , a state-controlled oil refiner, fell for a fourth day, losing 1.8 percent to 21.70 baht. The stock is poised for the lowest close since Feb. 14. The company may shut its crude-processing unit for three months for maintenance after a fire, it said on July 5.
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