Nuttachart Mekmasin, executive director of the research department, said the brokerage expects the Stock Exchange of Thailand (SET) index to improve in the first half of May due to internal and external factors. Pornprom SatrabhayaAsia Plus Securities (ASPS) said buying is more likely than selling this month with fund flows especially after the general election. "Statistically, in the years that the SET index fell in January-April, selling is unlikely in May. The SET index stands at around 1,500, lower than the first-quarter average of 1,645. ASPS expects the SET index to be around 1,610 points with limited upside.