Bangkok, Thailand – October 31, 2025 – PRESSADVANTAGE –
Siam Legal International, a leading law firm specializing in international business law in Thailand, emphasizes the continuing significance of the U.S.-Thailand Treaty of Amity as it approaches its sixth decade of facilitating American business investment in Southeast Asia’s second-largest economy.
Signed in 1966, the Treaty of Amity stands as one of the earliest and most enduring trade agreements between the United States and an ASEAN nation. The agreement has provided American businesses with preferential treatment in Thailand for nearly 60 years, granting privileges that remain unavailable to most other foreign investors.
The Treaty allows U.S. citizens and companies to hold majority ownership in Thai companies, up to 100 percent in most sectors, while providing national treatment that ensures American enterprises receive the same rights as Thai nationals in conducting business. These provisions have made Thailand an increasingly attractive destination for U.S. investment across manufacturing, services, technology, and renewable energy sectors.
“The Treaty of Amity continues to serve as a cornerstone of U.S.-Thai economic relations, providing American investors with unique advantages in one of Asia’s most dynamic markets,” said Rex Baay, Spokesperson for Siam Legal International. “We regularly assist American companies in navigating the Treaty certification process and establishing compliant business structures that maximize these benefits while ensuring full regulatory compliance.”
Thailand’s strategic position within ASEAN and its developed infrastructure have positioned the country as a preferred base for U.S. companies expanding throughout Asia. The nation’s commitment to improving ease of doing business and regulatory transparency has further strengthened bilateral investment flows, with American enterprises contributing significantly to Thailand’s economy through technology transfer, job creation, and sustainability initiatives.
The Treaty’s relevance extends beyond traditional sectors, now encompassing digital innovation, clean energy, fintech, and logistics industries. This evolution reflects both countries’ adaptation to changing global economic dynamics while maintaining the fundamental principles of mutual respect and economic cooperation that have characterized U.S.-Thai relations for over 190 years.
Siam Legal International has developed extensive expertise in assisting American investors with company formation under the Treaty of Amity framework. The firm’s bilingual legal team specializes in Treaty certification, Board of Investment applications, work permit processing, and ongoing compliance requirements. For detailed information about establishing a business under the Treaty of Amity, comprehensive guidance is available at https://www.siam-legal.com/Business-in-Thailand/US-Thai%20Amity.php.
As emerging opportunities in digital trade, smart manufacturing, and sustainable energy partnerships continue to develop, the Treaty of Amity remains instrumental in shaping the next phase of U.S.-Thai business collaboration. The agreement’s protection against nationalization and guarantee of fair treatment provide American investors with the confidence needed to pursue long-term ventures in Thailand.
Siam Legal International maintains offices in Bangkok, Chiangmai, Phuket, and Pattaya and provides comprehensive legal services covering business registration, immigration, property transactions, and litigation support. The firm specializes in bridging the gap between U.S. corporate standards and Thai regulatory requirements, ensuring smooth market entry and operational compliance for American businesses.
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For more information about Siam Legal International, contact the company here:
Siam Legal International
Rex Baay
+662 254 8900
info@siam-legal.com
18th Floor, Unit 1806 Two Pacific Place,
142 Sukhumvit Rd, Khlong Toei,
Bangkok 10110, Thailand
