SET Listing Rules and the Foreign-Ownership Cap by Sector

Questions this report answers

What's required to list on SET? Per Optiwise's 2025 overview and SET official guidance: minimum market capitalisation of THB 7,500M🔒, free-float requirement of 20%🔒 for large companies (paid-up capital >= THB 10B🔒), at least 1,000 minority shareholders, and share-distribution ratio of 20-30%🔒. The mai (Market for Alternative Investment) tier accepts smaller companies with 300-shareholder minimum. The June 2025 SET consultative paper proposes lowering free-float to 17%🔒 for large companies, shifting tier classification from paid-up capital to market capitalisation, and establishing a minimum 30M🔒-shares free float threshold per Thailand Business News.^{[3, 1, 2]}

What's the foreign-ownership-cap framework? The Foreign Business Act B.E. 2542 (1999) caps foreign equity in Thai-incorporated companies at 49%🔒 by default per Baker McKenzie and Clearstream. Sector-specific caps tighten this further: commercial banks at 25%🔒, telecom and insurance at 49%🔒 (with structural exceptions), and private land title at 0%🔒 (foreigners cannot own land freehold in Thailand outside narrow Board of Investment exceptions). The 49%🔒 cap is the structural constraint that makes NVDRs essential for foreign-investor access to capped stocks.^{[5, 6, 9]}

How do NVDRs work? Per Clearstream and SET official guidance: NVDRs were introduced in 2001 by Thai NVDR Company Limited, a wholly-owned SET subsidiary. NVDRs are issued against Thai-listed company shares. Foreign investors purchase NVDRs instead of underlying shares — the NVDRs trade alongside the underlying shares but don't count against the foreign-ownership cap. NVDR holders receive the same financial benefits (dividends, rights issues) as ordinary shareholders but vote only in exceptional circumstances (e.g., company delisting). The structural effect: foreign investors get economic exposure to capped Thai stocks without breaching FBA limits, and Thai companies get cleaner free-float economics.^[6]

What's pending in the regulatory pipeline? The June 2025 SET consultation closed on 25 June 2025; final implementation timing depends on SET board approval and SEC concurrence. The OECD Capital Market Review of Thailand 2025 issued recommendations on free-float modernisation and foreign-ownership-cap reform — these are advisory but historically influential on Thai capital-market policy. Foreign Business Act modernisation is on the policy agenda but lacks a clear 2026 legislative pipeline. Watch SET listing-rules updates Q2-Q3 2026 as the implementation-confirmation window.^{[7, 8]}

Executive summary

Thailand's SET listing rules and foreign-ownership-cap framework are mature, well-documented, and currently undergoing modernising consultation. SET requires THB 7,500M🔒 minimum market capitalisation, 20%🔒 free-float for large companies, at least 1,000 minority shareholders, and 20-30%🔒 share-distribution ratio. The June 2025 SET consultative paper proposes free-float reduction to 17%🔒, tier-classification shift to market-capitalisation basis, and minimum 30M🔒-shares free float threshold per Thailand Business News.^{[3, 1, 2]}

The foreign-ownership-cap structure is the operational reality every Thai-listed equity must navigate. Foreign Business Act B.E. 2542 (1999) caps foreign equity at 49%🔒 default; commercial banks 25%🔒, private land 0%🔒. NVDRs — issued by Thai NVDR Company Limited, an SET wholly-owned subsidiary, since 2001 — provide the regulatory-sanctioned foreign-investor access route for capped stocks. NVDR holders get economic exposure (dividends, rights) but no voting rights except in exceptional circumstances. The structural effect: foreign access works smoothly via NVDRs for most-Thai-listed names, but voting-rights ceiling is real.^{[5, 6]}

Pending regulatory pipeline: SET consultation outcome implementation expected Q2-Q3 2026; OECD recommendations on free-float and foreign-ownership-cap modernisation provide advisory framework. Foreign Business Act modernisation is on the policy agenda but lacks a clear 2026 legislative pipeline. For foreign investors, the practical action set is unchanged in 2025-2026: use NVDRs for most positions, watch consultation-implementation outcomes for free-float thresholds, and monitor sector-specific cap exemptions case-by-case under the Board of Investment promotional framework.^{[7, 8]}

SET vs mai listing requirements at a glance