Thailand’s stock market is having its best year among Southeast Asian peers thanks to strong investor interest in AI-related companies, according to reports from June 25, 2026 [1, 2, 3]. Much of this gain is led by Delta Electronics (Thailand) Pcl, a maker of power-management systems for AI data centers. Delta’s stock has surged more than 80% this year, making it the country’s first company valued at over $100 billion—higher than the combined value of Thailand’s next four largest stocks [1, 2, 3].

Delta Electronics now accounts for about one-fifth of the Stock Exchange of Thailand (SET) Index, more than double its weighting from June 2025 when it was less than one-tenth of the index [2, 3]. The company ranks as Southeast Asia’s second-most valuable firm in the MSCI ASEAN Index, behind Singapore’s DBS Group Holdings Ltd [2, 3].

Despite these gains, Thailand’s stock market remains less dependent on technology than South Korea and Taiwan, where semiconductor firms dominate. Bloomberg Intelligence strategist Sufianti said, "Thailand isn’t a pure AI market, but its exposure to data centers, electronics, power systems and digital infrastructure gives investors a new way to view Thai equities beyond the traditional tourism, banks and domestic consumption cycle" [2].

Delta is the only pure technology company among the country’s largest stocks, which also include Advanced Info Service, PTT, Gulf Development, and Airports of Thailand [3]. Analyst Suwat Sinsadok of Globlex Securities highlighted Delta’s "timely capacity expansion to capture the surging demand for data centres globally" as a key factor behind its rise [2]. He added that Delta’s "earnings have consistently beaten expectations every quarter over the past two years, despite headwinds from US tariffs and the conflict in the Middle East; profit outperformance is likely to continue" [2].

Thailand’s exposure to AI comes through infrastructure such as data centers, electronics, and power systems rather than direct AI markets [2, 3]. The latest reports confirm sustained investor confidence in Delta Electronics and Thailand’s stock market leadership in Southeast Asia’s AI-related gains this year [1, 2, 3].