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Siwarut Thammarong

Associate

Biography

Siwarut Thammarong is an associate in the intellectual property department at Tilleke & Gibbins in Bangkok. He specializes in a wide range of intellectual property matters, including trademark prosecution, dispute resolution, enforcement, and litigation. Siwarut advises clients on intellectual property protection, working with a diverse clientele ranging from small and medium enterprises to publicly listed corporations and government agencies.

In addition to intellectual property protection, Siwarut provides counsel on intellectual property management and strategic utilization, including licensing, franchising, investment, and research funding.

Before joining Tilleke & Gibbins, Siwarut began his career in the intellectual property field at a fast-growing, full-service intellectual property and innovation consulting firm, where he acquired extensive experience and a diverse set of skills. He later led the trademark practice in the intellectual property department of a well-established international law firm in Thailand, where he developed workflows, managed all trademark matters, handled IP disputes and IP-related agreements, and built client relationships.

Siwarut holds an LLB in business law from Prince of Songkla University. He is an extraordinary member of the Thai Bar Association and is licensed as a lawyer and a notarial services attorney by the Lawyers Council of Thailand.

Experience

  • Provided comprehensive assistance to a world-renowned institution specializing in culinary and hospitality education on the prosecution of trademarks, meticulous management of its intellectual property portfolio, and strategic trademark licensing in Thailand.
  • Assisted one of the world’s largest hotel chains in resolving a copyright dispute in Thailand by strategically countering a cease-and-desist letter, leading to a favorable settlement that avoided the need for compensation payments, safeguarded the client’s interests, and mitigated potential financial liabilities.
  • Provided comprehensive assistance to one of the world’s largest social media companies in reviewing and refining employment contracts for remote workers to ensure the company’s rights to any intellectual property developed by employees during their work-from-home periods.
  • Provided expert assistance to a Thai state enterprise in the thorough review and analysis of strategic research funding agreements, with the aim of securing the enterprise’s rights to patent any innovations resulting from the foreground research, ensuring effective protection and management of their intellectual property.
  • Assisted government agencies in developing their internal intellectual property management systems, which enhanced their ability to protect and leverage intellectual property, positively impacting the development and efficiency of their public services.
ABOUT Siwarut

Location

Languages

    Thai

    English

Education

    LLB, Prince of Songkla University

Insights

August 20, 2026
As part of its membership in Lex Mundi, Tilleke & Gibbins has released the latest edition of its Guide to Doing Business in Thailand, providing an overview of the legal, regulatory, and commercial considerations for companies establishing or expanding operations in Thailand. The 2026 edition offers practical insight into the country’s business environment, investment framework, and operational requirements. The guide covers a wide range of topics relevant to foreign and domestic investors, including: Investment incentives and promotion schemes Financial facilities and banking regulations Exchange controls and money transfers Import and export regulations Business structures and incorporation options Requirements for establishing a business Operational and compliance considerations Business cessation and insolvency procedures Employment and labor laws Taxation Immigration and visa requirements Prepared by Tilleke & Gibbins lawyers across multiple practice areas, the publication outlines key aspects of doing business in Thailand, including foreign investment restrictions, regulatory compliance obligations, corporate structures, employment requirements, and recent legal and economic developments affecting investors. The publication forms part of Lex Mundi’s Country Guides series, a global collection of jurisdiction-specific reference materials prepared by member firms around the world. Together, these guides help companies evaluate opportunities, compare regulatory environments, and plan international business activities across multiple markets. The full Guide to Doing Business in Thailand 2026 is available through the button below.
August 10, 2026
Thailand has finalized its social media KYC (“know your customer”) rules under Notification of the Electronic Transactions Commission on Measures to Prevent Technological Crimes for Social Media Service Providers (No. 2), which was published in the Government Gazette on May 5, 2026, and will take effect on November 1, 2026. While an early draft of the notification proposed requiring social media platforms to arrange identification of every user account, the final notification is significantly more targeted, focusing on paid online advertising and advertiser identity verification. Though the regulatory initiative primarily aims to combat online fraud and technology-related crimes, it also has important consequences for intellectual property enforcement, because the verified platform records that will be generated under the new requirements can help IP rights holders to identify anonymous online infringers. Key Regulatory Mandates The notification requires social media service providers to verify the identity of advertisers before their paid advertisements are published and disseminated in Thailand through social media, regardless of whether the advertising fees come from the advertisers or third parties. Verification of an advertiser is valid for one year, after which verification would have to be performed again before the platform could publish additional paid advertisements from the advertiser. Permitted verification methods are specified under the notification. A platform may verify an advertiser by checking identity evidence and confirming the connection between the advertiser and that identity evidence, with the notification giving facial comparison against certain government-issued identity documents as an example. Alternatively, platforms may verify advertisers through a digital identity verification and authentication system with an identity-proofing assurance level not lower than the level prescribed by Thailand’s Electronic Transactions Commission. The notification further requires platforms to retain only the advertiser’s information necessary to identify the advertiser, beginning from the start of the advertising activity and for
February 26, 2026
Thailand is preparing to offer new tools for intellectual property enforcement as the Electronic Transactions Development Agency (ETDA) recently released for public consultation a draft notification requiring social media platforms to verify user identities and conduct know-your-customer (KYC) checks on advertisers. The draft Notification of the Electronic Transactions Commission on Measures to Prevent Technological Crimes for Social Media Service Providers, which is to be issued under the Emergency Decree on Measures for the Prevention and Suppression of Technological Crimes B.E. 2566 (2023), as amended in 2025, primarily aims to combat online fraud and technology-related crimes. However, its new obligations also provide IP owners with valuable tools to identify anonymous infringers. Key Regulatory Mandates The draft notification imposes several verification requirements on social media platforms operating in Thailand. These requirements also strengthen IP rights holders’ ability to identify anonymous infringers, as platforms must: Verify user identities through registered phone numbers and link all accounts to verifiable identities. Conduct KYC checks on advertisers, including individuals, companies, and any third-party payers. Perform heightened identity checks for high-risk or repeat offenders before publishing advertisements. Promptly remove content flagged by the Anti-Technology Crime Division and prescreen advertisements for prohibited or high-risk content. How IP Owners Can Use This Notification for Enforcement The phone number–based verification requirement enables IP owners to work more effectively with enforcement authorities in tracing individuals or entities responsible for infringing content. The comprehensive advertiser KYC obligations, including mandatory disclosure of third-party payment sources, create a clear audit trail even when bad actors attempt to obscure their identity through intermediaries or shell accounts. This traceability is essential for pursuing damages and dismantling organized counterfeit operations. The ETDA is now considering adjustments to the draft notification after receiving comments during the public consultation period, which ended on February 2, 2026. Following finalization
December 9, 2025
Tilleke & Gibbins is proud to announce that four litigation cases handled by the firm have been selected among the nine Distinguished Judgment Awards granted by Thailand’s Central Intellectual Property and International Trade Court (IP&IT Court) for the period from October 1, 2024, to August 31, 2025. This recognition highlights the complexity, novelty, and legal significance of these cases, which were chosen based on stringent criteria including new legal issues, high evidentiary volume, and intricate legal arguments. Among these four cases, one was singled out as the “Most Distinguished Judgment” – the landmark trademark squatting case involving the trademark rights of our client, Thailand’s largest state-owned energy conglomerate, and its subsidiary. In this case, the defendants had filed 52 trademark applications mimicking our client’s marks, making it the largest trademark squatting dispute in Thai history. On April 30, 2025, the IP&IT Court ordered the cancellation of multiple infringing trademarks, setting a benchmark for IP enforcement against trademark squatters in Thailand. The other three recognized cases demonstrate Tilleke & Gibbins’ breadth of expertise in IP litigation: Patent infringement and invalidation involving trade secrets misappropriation. Trade dress infringement of a unique packaging. Landmark Luckin Coffee case involving trademark infringement and invalidation. The IP&IT Court handles approximately 200 IP civil litigation cases each year, and our IP litigation team has typically been involved in 25–30% of them, reflecting our dominant role in shaping IP jurisprudence in Thailand.

Awards & Rankings

September 11, 2026
Tilleke & Gibbins has been named TMT Firm of the Year at the Asia Legal Awards 2026, presented by Law.com International. The winners were announced at an awards ceremony in Singapore on September 10, 2026. The TMT Firm of the Year award recognizes Tilleke & Gibbins’ work in the technology, media, and telecommunications sector, where its lawyers advise clients on complex legal and regulatory matters arising from technological development and the rapidly evolving digital economy. The Asia Legal Awards recognize significant transactions, cases, and legal work across Asia. Presented by Law.com International and open to law firms with offices in the region, the awards honor the firms, teams, and individuals demonstrating innovation, impact, and excellence in the legal industry. For more information, please see the full list of Asia Legal Awards 2026 winners and finalists.
August 13, 2026
Tilleke & Gibbins has been recognized in the inaugural Asia Top Cybersecurity & Data Law Firms 2026 list from Asian Legal Business (ALB), published in the magazine’s August 2026 edition. The new ranking highlights leading law firms across Asia with dedicated cybersecurity, privacy, and data regulation practices, recognizing firms with a proven track record of advising clients on complex cybersecurity and data law matters. Tilleke & Gibbins is one of only 21 firms included in the inaugural list, reflecting the firm’s strength in data privacy, cybersecurity, technology, and regulatory matters throughout Southeast Asia. According to ALB, the firms selected for inclusion are recognized for their capabilities in areas such as privacy compliance, incident response, digital investigations, and technology-enabled client service. The recognition underscores the continued growth and regional prominence of Tilleke & Gibbins’ data privacy and cybersecurity practice, which advises clients across a broad range of industries on data protection compliance, cybersecurity preparedness and response, technology transactions, digital platform regulation, and emerging regulatory developments. This latest honor reflects the firm’s commitment to helping clients navigate an increasingly complex digital and regulatory landscape and reinforces its reputation as a leading adviser on technology, privacy, and cybersecurity issues across the region.
May 14, 2026
Asian Legal Business (ALB) has published the ALB Asia IP Rankings 2026, the latest edition of its annual guide recognizing leading intellectual property firms across the region. Continuing the approach introduced last year, the rankings present a unified table in each jurisdiction, combining patent and trademark/copyright work to provide a more holistic view of the IP market. Tilleke & Gibbins has retained strong rankings in all three jurisdictions covered by the survey: Thailand: Tier 1 Vietnam: Tier 1 Indonesia: Tier 2 The rankings are based on work conducted between February 2025 and February 2026, covering both ongoing and completed contentious and noncontentious matters. ALB’s research draws on firm submissions, client feedback, editorial resources, and market input to identify the region’s leading IP practices. Tilleke & Gibbins’ IP team has maintained a strong track record across all ranked jurisdictions since the inception of the ALB IP Rankings in 2018. To view the full rankings, please see the May 2026 issue of ALB.

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