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LS Horizon Limited

Work +66 2 627 3443
Fax +66 2 627 3250
Bangkok, Vientiane, Yangon
LS Horizon Limited, Wanchai Yiamsamatha, Bangkok, THAILAND

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Wanchai Yiamsamatha

Work +662 6273443
LS Horizon Limited

Work Department

Head of the Administrative and Constitutional Law Practice Group.


Wanchai Yiamsamatha is a partner of LS Horizon specializing in Administrative and Constitutional Law and Regulatory and Government matters. He has represented international and Thai entities in complex actions brought against the State agencies in the Administrative Courts and the Constitutional Court. He also defends administrative agencies in actions brought before the Administrative Courts. He also provides legal advice in respect of telecommunications and broadcasting law, energy business law, State Joint Venture law, consumer protection law, administrative procedure law and administrative court law, as well as constitutional law. His major clients include Stock Exchange of Thailand, True Group, Gulf JP Group, Siam Makro Public Company Limited etc.


Thai and English


Thai Bar Association, Member of Sub-Committee on Scrutiny of Violation of Economics, Social and Culture Rights, National Human Rights Commission, He is an adviser to the Executive Board, Master Degree Project for Financial Executives (Special Class), Business School, Kasetsat University.


LL.B. from Thammasat University (1985); Thai Bar Association (1987); LL.M. from Southern Methodist University (1990); LL.M. from University of Pennsylvania (1996); Certificate of Achievement on the Training Program for Administrative Case Officials for the General Public, Chulalongkorn University and Office of the Administrative Courts (2003); Directors’ Certificate Program -Thai Institute of Directors Association (Class 66/2005); Training Program for Mid-level Executives of Justice Administration, Class 4, Ministry of Justice (2012); and Training Course on Administrative Justice for Executives (AJE) (2012), Class 3, Office of the Administrative Courts (2012). Thammasat Leadership Program, Class 3, Thammasat University (2014)


Dispute resolution

Within: Leading individuals

Wanchai Yiamsamatha - LS Horizon Limited

Within: Dispute resolution

The service provided by LS Horizon Limited’s disputes resolution team is, by some clients’ measure, ‘above the standard of many Thai firms’. With experience in commercial litigation and ADR, it has strengths across a number of sectors, but is especially active in banking and finance, real estate and construction disputes. The department is jointly headed by Prechaya Ebrahim, who specialises in labour and employment law, Lersak Kancvalskul, who focuses on insolvency and bankruptcy, and administrative court specialist Wanchai Yiamsamatha. In one precedent-setting matter, Yiamsamatha, ‘one of the most valued legal advisers in Thailand’, acted for the Stock Exchange of Thailand and its board of directors in a Central Administrative Court case brought by Scan Global regarding the delisting of shares in a public limited company. Kancvalskul assisted Bali Hai Co, a luxury condominium project company, with its filing for rehabilitation with the Central Bankruptcy Court. Ebrahim is instructed by clients such as Banpu Public Company, Nation Multimedia and Sojitz Corporation regarding a variety of commercial disputes.

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