May 30 (Bloomberg) -- Shares of the following companies had unusual moves in Thailand trading. Stock symbols are in parentheses and prices are as of the close in Bangkok.
The SET Index slid 1.3 percent to 1,138.63, the first drop in five days. The gauge has declined 7.3 percent this month, headed for the first monthly loss since September.
Oil companies: PTT Pcl (PTT TB), Thailand’s largest energy company, dropped 1.9 percent to 307 baht. PTT Exploration & Production Pcl (PTTEP TB), the nation’s only publicly traded oil explorer, lost 2.6 percent to 153 baht. Crude oil decreased as much as 1.3 percent to $89.55 a barrel in New York.
Rubber producers: Sri Trang Agro-Industry Pcl (STA TB), Thailand’s largest rubber producer, fell 2.6 percent to 15 baht. Thai Rubber Latex Corp. (Thailand) Pcl (TRUBB TB) dropped 3.6 percent to 3.18 baht.
Rubber futures slumped as much as 2.2 percent to 265.8 yen a kilogram ($3,350 a metric ton) before settling at 271.7 yen on the Tokyo Commodity Exchange.
Vinythai Pcl (VNT TB), a maker of polyvinyl chloride, climbed 2.4 percent to 17 baht, the highest close since May 17. The company will spend about 1 billion baht ($31.4 million) to acquire Solvay Biochemicals (Taixing) Ltd. in China, according to a regulatory filing. Solvay Biochemicals will invest 7.2 billion baht in a new plant in China, it said.
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