The index gained 5.72 points or 0.0.41 per cent today, to end the day at 1,408.51 points. Turnover was Bt41.5 billion.
The index advanced though foreign investors sold Thai shares for Bt2 billion net on Thursday. This boosted their net-sell this month to Bt33.59 billion.
Local funds’ net buy today are tuned at Bt1.22 billion, boosting their net buy this month to Bt17.5 billion.
Other Asian stock markets were mostly lower on Thursday as investors took a breather after the previous day's rally, taking their lead from a retreat on Wall Street.
Tokyo reversed earlier losses to end higher for a sixth straight session. The Nikkei edged up 10.77 points to 14,681.72, while Sydney fell 0.14 per cent, or 7.68 points, to 5519.5 and Seoul lost 0.24 per cent, or 4.80 points, to close at 2,012.26.
Shanghai shed 0.47 per cent, or 9.63 points, to 2,040.60 and Hong Kong lost 0.30 per cent, or 69.89 points to 23,010.14.
With key US economic data due to be released later in the day, including the second estimate of first-quarter gross domestic product, dealers were keeping to the sidelines after enjoying a healthy pick-up on Wednesday, according to AFP.