Firm Profile > Siam Premier International Law Office Limited > Bangkok, Thailand

Siam Premier International Law Office Limited

Corporate and M&A (including capital markets) Tier 2

Siam Premier International Law Office Limited has experience acting for targets and acquirers in public and private M&A, both domestically and internationally. In particular, the team has historically been most active in the construction, hospitality, transportation, insurance and technology sectors. Key figures in the practice group include Kulkanist  Khamsirivatchara and Linda Osathaworanan, who is rated for her experience in corporate restructurings, foreign investment transactions, and conversions from private to public companies. Recent highlights included Chatchavej Chitvarakorn acting for Continental AG in its proposed transaction to carve out its power train business. Also recommended is Bancha Wudhiprecha, who has experience of commercial transactions, antitrust and compliance matters.  

Practice head(s):

Kulkanist Khamsirivatchara; Linda Osathaworanan; Chatchavej Chitvarakorn; Bancha Wudhiprecha

Key clients


Audemars Piguet

Continental AG




Singha Venture

Kering Group

Dispute resolution Tier 2

Siam Premier International Law Office Limited has notable experience in representing Thai and foreign corporations at every level of Thai court, and also in proceedings at the Thai Arbitration Institute. Techatat Udomsiri has handled commercial and employment disputes as well as administrative proceedings; Kong Suriyamontol has particular expertise in mining and natural resources disputes; and senior consultant Sumit Masrungson has decades of experience acting for public and private sector clients in commercial and administrative disputes.

Practice head(s):

Techatat Udomsiri; Kong Suriyamontol; Sumit Masrungson

Labour and employment Tier 2

Siam Premier International Law Office Limited's labour and employment practice represents domestic and foreign employers in both contentious and non-contentious matters. The team is led by Rawat Chomsri a labour and industrial relations expert, who has extensive experience in the Thai Labour Court, and is regularly instructed by corporates to advise on contract drafting and reviews of work regulations. Sumit  Masrungson handles labour and employment disputes for public and private sector clients, and associate rising star Phatcharapon Sunlakawit is also recommended.

Practice head(s):

Rawat Chomsri

Other key lawyers:

Sumit Masrungson

Key clients

Isuzu Motors (Thailand)

Siemens Limited (Thailand)

Suzuki Motors (Thailand)

Real estate and construction Tier 2

Siam Premier International Law Office Limited advises lenders, sponsors, and government bodies on foreign investments, construction agreements, PPP development projects, and all related project and contract disputes. The team is also active in the energy infrastructure space, where it acts for a number of domestic and international oil companies. Rawat Chomsri handles a range contentious and non-contentious matters and has particular expertise in the renewable energy sector, and Chatchavej Chitvarakorn has extensive experience in construction, most notably PPP work, where he advises governmental authorities, banks and bidders. Associate Ajjima Kanokmaneechotikul is active in acquisition due diligence and leasing transactions.

Practice head(s):

Rawat Chomsri; Chatchavej Chitvarakorn

Other key lawyers:


‘The heart and soul of the practice is the ability and leadership of Chatchavej Chitvarakorn. He takes ownership of all matters on which his team works, and personally ensures that the work product and service is the best in Thailand.’

‘Chatchavej Chitvarakorn is the best real estate and corporate lawyer in Thailand. His work ethic is unmatched, and he provides advice that is commercial and tailored’

‘Chatchavej Chitvarakorn is responsive, accommodating, and wins over clients and opposing parties with personal charm, intelligence and a fair and balanced approach.’

Key clients


Electricity Generating Authority of Thailand

Electricity Generating

PTT Exploration and Production


Banking and finance Tier 3

Siam Premier International Law Office Limited advises public sector borrowers and a variety of financial institutions including commercial and investment banks works on a range of transactional and regulatory banking and finance matters. The practice group is jointly led by Suttiphat  Khamsirivatchara, who has expertise in bank lending and structured finance, and Nithi Soomswasdi, who is a name to note for debt restructuring and project finance. The firm also fields an experienced litigation team that acts in banking disputes. Torsakul Cunvong is also recommended.

Practice head(s):

Suttiphat Khamsirivatchara; Nithi Soomswasdi

Other key lawyers:

Capital markets Tier 3

Siam Premier International Law Office Limited's capital markets practice is spearheaded by Kulkanist Khamsirivatchara, who has experience of securities transactions, take private deals, and myriad regulatory matters. The team is active in the debt and equity markets, where it is regularly involved in IPOs and secondary capital raisings.

Tax Tier 3

Siam Premier International Law Office Limited handles tax litigation and corporate tax planning, and advises on the Thai law elements of M&A and other corporate transactions. Practice head Praphan Phichaiwatkomol has extensive experience in contentious and non-contentious tax matters, and associate Keerada Rungtanakiat is rated for tax advice on inbound and outbound investment transactions. Energy, aviation, shipping and property are key sectors for the firm.

Practice head(s):

Praphan Phichaiwatkomol

Other key lawyers:

Siam Premier is a leading independent Thai law firm, advising foreign and local clients on the full spectrum of domestic and cross-border corporate transactions, major projects, regulatory matters and disputes in Thailand.

Established in 1990, we have a strong history of providing pragmatic and innovative solutions to our clients’ legal challenges, enabling our clients to unlock opportunities and achieve commercial outcomes.

Our relationship-focused approach includes working closely with our clients to understand their needs, challenges and business objectives, while closely monitoring local legal developments. This approach, coupled with our deep sector experience, enables us to deliver solutions designed to give our clients the commercial edge.

We frequently work with leading law firms from across the globe on cross-border and multi-jurisdictional transactions and disputes, where we add value by understanding the nuances of local challenges, navigating complex regulatory frameworks, and providing valuable insight into the local business and legal environment in Thailand.

Driven by our clients’ needs in an ever-changing landscape, our forward thinking and diverse team of lawyers are dedicated to delivering exceptional outcomes for our clients, wherever their businesses take them.

Department Name Email Telephone
Managing Partner Phisud Dejakaisaya +6626461888
Partner Apichart Chirabandhu +6626461888
Corporate Commercial Bancha Wudhiprecha +6626461888
Corporate/M&A, Antitrust and Competition, Foreign Direct Investment, Insurance, Projects & Energy, PPPs, Real Property & Construction, Litigation & Dispute Resolution Chatchavej Chitvarakorn +6626461888
Corporate/M&A, Foreign Direct Investment, Capital Markets, Banking and Finance, Antitrust and Competition Kanokon Worachanyawong +6626461888
Litigation and Dispute Resolution Kong Suriyamontol +6626461888
M&A, Capital Markets, Securities Regulations, Public Company and Corporate, Foreign Investment, Litigation Strategy Kulkanist Khamsirivatchara +6626461888
Corporate/M&A, Foreign Direct Investment, Capital Markets Linda Osathaworanan +6626461888
Banking & Finance, Debt Restructure, Mergers & Acquisitions Nithi Soomswasdi +6626461888
Banking & Finance, Corporate Commercial, Capital Markets, Foreign Direct Investment, Restructuring & Insolvency, Projects & Energy, Real Property & Construction Phasunsook Ayanaputra +6626461888
Taxation, Foreign Investment, Mergers & Acquisitions, Commercial, Corporate, Property Praphan Phichaiwatkomol +6626461888
Capital Markets, Corporate/M&A, Employment & Labour, Foreign Direct Investment, Litigation & Dispute Resolution Rawat Chomsri +6626461888
Corporate/M&A, Commercial, Capital Markets Saithip Mansri +6626461888
Corporate / M&A, Commercial, Banking & Finance Siripun Kriangwattanapong +6626461888
Capital Markets, Corporate / M&A, EPC & Project Finance, Energy, Real Estate, Foreign Investment Suttiphat Khamsirivatchara +6626461888
Litgation and Dispute Resolution Techatat Udomsiri +6626461888
Banking & Finance, Corporate Commercial Torsakul Cunvong +6626461888
Senior Consultant: Corporate Commercial, Foreign Direct Investment, Capital Markets, Real Property & Construction, Employment & Labour Piyamarn Pongtornpipat +6626461888
Senior Consultant: Litgation and Dispute Resolution, Labour & Employment Sumit Masrungson +6626461888
Senior Consultant: Dispute Resolution Suthee Dumnuadee +6626461888
Special Counsel: Litigation and Dispute Resolution Chakrapong Boonchan +6626461888
Special Counsel: Litigation and Dispute Resolution Kasem Pumpuang +6626461888
Special Counsel: Real Property Sawat Sangkavisit +6626461888
Special Counsel: Litgation and Dispute Resolution, Labour & Employment Somchai Yungkarn +6626461888
Photo Name Position Profile
Mr Phasunsook Ayanaputra  photo Mr Phasunsook Ayanaputra
Mr Chakrapong Boonchan  photo Mr Chakrapong Boonchan
Mr Apichart Chirabandhu  photo Mr Apichart Chirabandhu
Mr Chatchavej Chitvarakorn  photo Mr Chatchavej Chitvarakorn
Mr Rawat Chomsri photo Mr Rawat Chomsri
Mr Torsakul Cunvong  photo Mr Torsakul Cunvong
Mr Phisud Dejakaisaya photo Mr Phisud Dejakaisaya
Mr Suttiphat Khamsirivatchara  photo Mr Suttiphat Khamsirivatchara
Ms Kulkanist Khamsirivatchara  photo Ms Kulkanist Khamsirivatchara
Ms Siripun Kriangwattanapong  photo Ms Siripun Kriangwattanapong
Ms Saithip Mansri  photo Ms Saithip Mansri
 Sumit Masrungson photo Sumit Masrungson
Ms Linda Osathaworanan  photo Ms Linda Osathaworanan
Mr Praphan Phichaiwatkomol  photo Mr Praphan Phichaiwatkomol
Ms Piyamarn Pongtornpipat  photo Ms Piyamarn Pongtornpipat
Mr Kasem Pumpuang  photo Mr Kasem Pumpuang
Mr Sawat Sangkavisit  photo Mr Sawat Sangkavisit
Prof Dr Surakiart Sathirathai  photo Prof Dr Surakiart Sathirathai
Mr Nithi Soomswasdi  photo Mr Nithi Soomswasdi
Mr Kong Suriyamontol  photo Mr Kong Suriyamontol
Mr Techatat Udomsiri  photo Mr Techatat Udomsiri
Ms Kanokon Worachanyawong  photo Ms Kanokon Worachanyawong
Mr Bancha Wudhiprecha  photo Mr Bancha Wudhiprecha
Mr Somchai Yungkarn  photo Mr Somchai Yungkarn
Number of lawyers : 90+
Singapore-Thai Chamber of Commerce (STCC)
The Australian-Thai Chamber of Commerce