TS Oon & Partners


Established in 2002, TS Oon & Partners is a leading full-service law firm in Malaysia that has significant experience in assisting international companies with their foreign direct investment needs in Malaysia.

The firm also offers a wide range of legal services to companies and individuals such as: corporate; dispute resolution; employment; family; private client; and real estate. A large part of the firm’s business is advising on multijurisdictional transactions and disputes. The firm also has the ability to provide clients with immediate assistance as soon as a fraud is discovered. Our lawyers are specialists in obtaining urgent protective injunctions and freezing orders to prevent a fraudster from dissipating monies or assets.


Oon Thian Seng

Managing Partner, Head of Shipping & Head of Corporate

+60 3 2283 6200

Thian Seng is the Managing Partner at TS Oon & Partners.

Thian Seng is noted for his ability to handle transactions involving highly technical issues and is regularly instructed by clients in the shipping, oil & gas, banking, international trade, insurance and construction industries.

Thian Seng’s work involves charters and Engineering, Procurement, Construction, Installation & Commissioning (EPCIC) contracts throughout Southeast Asia and India. He also acts for the building, sale and purchase, and charter of vessels and rigs, ownership structures for oil and gas vessel owners to set up businesses and joint venture agreements for projects in Malaysia (including Labuan offshore structures) and Singapore.

He advises regional and international underwriters on liability under various classes of insurance including marine, property, CAR, professional indemnity and public liability cover. He also has extensive experience appearing as counsel in trials and appeals in the superior courts in Malaysia as well as in international arbitrations.

Chambers Asia Pacific ranks Thian Seng as a top tier lawyer for Shipping while Legal 500 Asia Pacific recognises Thian Seng for his work in Shipping in Malaysia. He is recommended as a Distinguished Practitioner for his work in Shipping by Asialaw Leading Lawyers and as a Dispute Resolution Star for his work in Shipping by Benchmark Litigation Asia Pacific.

Oon Thian Seng’s Professional Accolades

Kelly Yap

Head of Litigation, Senior Accredited Specialist in Maritime and Shipping Law

+60 3 2283 6200

Kelly handles the full suite of commercial disputes, with a particular focus on international trade and shipping matters. He also leads the Shipping Practice and China Practice.

His expertise covers charter party disputes, crew claims, cargo claims, marine casualties involving collisions, groundings, fires, loss of life and salvage, bunker disputes, marine insurance, international trade, letters of credit disputes, and freight forwarding disputes, and ship chandler claims. He regularly acts for traders in all manner of disputes involving quality, shortage, and cargo damage claims.

Kelly also frequently deals with ship arrests, whether for the arresting party or for the owner of the arrested ship. Kelly has also represented companies and creditors in legal proceedings involving issues of fraud and breaches of directors’ fiduciary duties as well as asset tracing.

To aid his clients in court or arbitration proceedings, Kelly has obtained urgent freezing injunctions and mandatory injunctions.

Kelly’s Professional Accolades