The index fell sharply after Thailand registered 576 new Covid-19 cases on Sunday, its largest single-day spike since the outbreak began.
The 10 stocks with the highest trade value today were KBANK, BANPU, PTT, STGT, CPALL, AOT, ADVANC, IVL, CPF and PTTGC.
As of 4.30pm, the price of oil dropped by US$1.95 or 3.97 per cent to $47.15 per barrel, while gold rose by $11.30 or 0.60 per cent, to $1,900.20 per ounce.
Other Asian indices were mixed:
Japan’s Nikkei Index closed at 26,714.42, down 48.97 points or 0.18 per cent.
China’s Shang Hai SE Composite Index closed at 3,420.57, up 25.67 points or 0.76 per cent, while Shenzhen SE Component Index closed at 14,134.85, up 280.73 points or 2.03 per cent.
Hong Kong's Hang Seng Index closed at 26,306.68, down 191.92 points or 0.72 per cent.
South Korea's KOSPI Index closed at 2,778.65, up 6.47 points or 0.23 per cent.
Taiwan's TAIEX Index closed at 14,384.96, up 135.00 points or 0.95 per cent.
Singapore's Straits Times Index closed at 2,844.30, down 4.68 points or 0.16 per cent.
Vietnam's Ho Chi Minh Stock Index closed at 1,081.08, up 13.62 points or 1.28 per cent.