Rapinnart Prongsiriwattana


Contact Details

T: + 66 2 264 8000
F: + 66 2 657 2222

Rapinnart Prongsiriwattana has over 30 years of experience representing clients in civil, criminal, and administrative law disputes. Rapinnart has successfully represented major corporations in many of the country's most complex and high-profile cases. He has expertise in a wide range of industries, including construction and engineering, consumer products, energy (oil and gas and renewables), government and public sector, hotels and real estate, insurance, logistics, and telecommunications and media technology. He also has expertise in banking and finance, international trade, mergers and acquisitions. Prior to joining the Firm, Rapinnart was legal counsel at two major corporations.

Professional Activities 

Panelist, International Bar Association Asia Pacific International Arbitration Training. 

“Thailand”, Getting the Deal Through – Restructuring & Insolvency (Law Business Research, 2013 -2016).

Recent Experience


Representation of a major petroleum companyin connection with an explosion that occurred on a gas transmission pipeline inOctober 2020, providing integrated services in all potential litigationprocesses, the public investigation, corporate governance matters, insuranceissues, and public relations communications.

Representation of PTT Public Company Limited,the largest corporation in Thailand, in litigation regarding engineering,procurement and construction contracts in relation to a pipeline project valuedat more than THB 8.5 billion.

Representation of PTT Public Company Limited,Thai state-owned SET-listed oil and gas company, in resolving disputes inconnection with the engineering, procurement and construction contracts for theFourth Transmission Pipeline Project, valued at THB 2,261 million and USB 209million.  

Representation of PTT Public Company Limited inlitigation regarding a natural gas price and electricity charges in Thailandbetween 2012 and 2014. The dispute involved the complex energy market andrelated energy regulations in Thailand.   

Assisting Global Power Synergy Public CompanyLimited regarding a transactional dispute concerning the acquisition of a power plant of another leadingpower plant owner in Thailand.  

Assisting Global Green Chemical Public Company Limitedin criminal cases against its senior management and its suppliers inrelation to systematic fraud valued at approximately THB 2,100 million(approximately USD 70 million) at the Economic Crime Suppression Office.

Representation of PTT Public Company Limitedin the largest market capitalization on the Stock Exchange of Thailand as aresult of the corporatization and privatization of the Petroleum Authority ofThailand.  In the Supreme AdministrativeCourt, the client succeeded in having a suit attempting to de-list andprivatize it dismissed. This high-profile win helped to prevent severe damageto the structure of capital markets in Thailand.


Representation of a listed subsidiary of anenergy group in a dispute in relation to an inventory shortfall valued atTHB 2.1 billion (USD 69 million), advising on the investigation into the causeof the shortfall, reporting to the Stock Exchange of Thailand and providing comprehensive,integrated services in order to resolve the issues at every stage of a widerange of in court and out-of-court proceedings, including media and publicrelations communications.

Representation of a rayon company, theleading manufacturer of viscose staple fiber in Thailand, in defending anenvironmental law claim and class action filed by residents, as well as aDepartment of Special Investigations proceedings in connection with the tort ofnuisance and related damages.

Representation of a Thailand-based companyengaged in the manufacture and sale of carbon black, which is suppliedto global markets including Indonesia, Philippines, Malaysia, China, Korea,Taiwan and Australia, in the appeal process in relation to an environmentallawsuit claiming damages suffered from environmental impact from the carbonmanufacturing operations.

Representation of Posco Plantec (Thailand)Company Limited, part of the POSCO Group, a leading company in Korea andworldwide, in successfully resolving a USD 5.7 million arbitration claim in relation to the construction of arecycling plant.

Representation of Thai SteelCable Public Company Limited, a leadingautomobile parts manufacturing company, in litigation against its supplier forcomplex inherent defects in automobile parts.

Representationof Mitsui Sumitomo Insurance Company Limited (Thailand), part ofthe largest insurance group in Japan and worldwide, in successfully defending aTHB 2.154 billion complex litigation claim (approximately USD 69 million) madeby a major multinational automobile company, the plaintiff. The court of firstinstance dismissed all the plaintiff’s claims. This case also set the precedentthat an insurance claim in relation to business operations is a civil case,rather than a consumer case, thereby shifting the burden of proof to theplaintiff and barring claims for punitive damages.

Representation of a leadingmedical supply company in domestic and international litigation andarbitration in Thailand, Singapore, Austria and Switzerland to resolve disputesin relation to a long-term international joint venture agreement. In March 2017,the litigation team worked with the M&A and finance teams to finalize theresolution of these disputes, thereby achieving the clients’ goal of gainingcontrol of the company valued at over USD 150 million.

Representation of Silesia Flavors (Thailand)Company Limited in the IntellectualProperty and International Trade Court in relation to trade secrets and contract disputes involving distributorship and the sale of flavorcodes.

Telecommunications,Media and Technology

Representation of an internet servicesprovider as the defendant in an Administrative Court case defending thecivil law complaint regarding the use of conduits in relation to a concessionagreement filed by CAT Public Company Limited.

Representation of DTAC TriNet insuccessfully defending a THB 449 million Administrative Court case inconnection with CAT Telecom Public Company Limited and telecommunicationsregulations.

Representation of Total Access CommunicationPublic Company Limited (DTAC), one of the largest mobile andtelecommunication providers in Thailand, in successfully resolving anadministrative case and having an injunction lifted in relation to a high-profiledispute with CAT Telecom Public Company Limited regarding a concession contractvalued at THB 3.5 billion.

Real Estate, Engineering and Construction

Representation of Pacific Phuket, Co., Ltd.,one of the largest property development companies in Phuket, Thailand in adispute at the Singapore International Arbitration Center in connection with theconstruction, management and operation of a hotel.

Representation of an engineering and constructioncompany in arbitration proceedings claiming over THB 10 billion compensationfrom a Thai government authority for wrongful termination of a concessioncontract.

Representation of the St. Regis Hotelwith respect to an environmental law dispute before the Central AdministrativeCourt.

Representation of Trans Thai-Malaysia(Thailand) Limited in relation to the dispute on revocation of acertification of utilization of land (Nor Sor 3) in Chana District, SongkhlaProvince.


‘Thailand’, Restructuring and Insolvency - Getting the Deal Through (Law Business Research 2013-2016)


LL.M., International Commercial Law, Nottingham University, UK, 1997

LL.B., Thammasat University, 1992

Thai Bar Association, admitted 1994

Lawyers Council of Thailand, admitted 1993




Thai, English

Recent Accolades

Notable Practitioner – Dispute Resolution, Asialaw Profiles, 2022

Recommended Lawyer - Dispute Resolution, The Legal 500, 2015, 2018-2023

Recommended Lawyer- Technology, Media and Telecommunication, The Legal 500, 2018-2019

Litigation Star – Dispute Resolution, Benchmark Litigation, 2023

Litigation Star – Commercial and Transactions, Benchmark Litigation, 2023

Leading Lawyer, Energy and Infrastructure Disputes, IFLR 1000, 2016-2017

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