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Allen & Gledhill LLP

Work +65 6890 7188
Fax +65 6327 3800
Singapore, Yangon

William Ong

Work +65 6890 7894
Allen & Gledhill LLP

Work Department

International Arbitration, Litigation, Restructuring & Insolvency




William’s areas of practice encompass international arbitration, banking litigation, corporate insolvency and restructuring as well as corporate litigation.

William has substantial experience in banking litigation, financial and securities-related disputes, and regularly represents banks and financial institutions in disputes involving structured products, margin trading, valuations, guarantees and enforcement of security. He is also actively involved in representing clients in shareholder and directors’ disputes, as well as joint venture disputes.

He practises in the field of licensing, distribution and franchise disputes, and they span different industries ranging from computer software to boiler technology to pharmaceutical products. William has special interest in the field of assessment of damages and valuation methodology, as he believes that most disputes would be ultimately concerned with damages and its assessment - he is familiar with the technical and legal aspects of this area which is valued by clients.

William is effectively bilingual in English and Mandarin and has rendered expert opinions before the English courts and the courts of the People's Republic of China. He has also conducted arbitration and inquisitorial hearings in Mandarin, and regularly acts in arbitrations involving Chinese parties.

Called to the Singapore Bar in 2000 and joined Allen & Gledhill in the same year.


English, Mandarin


Singapore Institute of Arbitrators, Fellow.


Graduated from the National University of Singapore with an LLB (Hons) degree in 1999.

Singapore: Dispute resolution

Dispute resolution – Local firms

Within: Dispute resolution – Local firms

At Allen & Gledhill LLP, Dr Stanley Lai, SC ('a good strategist and IP litigator') is now the firm's sole Senior Counsel litigator following the departures of Ang Cheng Hock SC to the bench and Edwin Tong SC, who became Senior Minister of State for Law and Health. Despite these departures, the firm maintains a high market share of big-ticket Singapore disputes. Lai recently led the team that represented Credit Suisse Trust in a headline dispute concerning a trust set up by Bidzina Ivanishvili, the Georgian billionaire and former Prime Minister of Georgia. The 'truly excellent', 'professional' and 'fantastic' team features William Ong, who 'can zero in on the key issues of concern, map out strategic solutions and passionately deliver legal arguments'. Vincent Leow provides 'very good and practical advice' and 'impresses with the quality of his work'. Jason Chan is noted for white-collar crime and investigations, while Yong Seng Tay 'truly goes above and beyond' and 'understands what the business is and what the business wants'. Peh Aik Hin is a 'top-tier lawyer' who is 'razor sharp in getting to the issues and addressing concerns'. Kristy Tan has has joined the Attorney General's Chambers.

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Singapore: Intellectual property

Intellectual property – Local firms

Within: Intellectual property – Local firms

Allen & Gledhill LLP fields 'a fabulous team that knows its stuff and can deliver outcomes'. Practice head Dr Stanley Lai, SC is 'a good strategist and has the seniority to reach out to third parties and their counsel to mediate and deliver outcomes'. Other key members of the team include Low Pei Lin, Tham Kok Leong and William Ong. The group has a range of expertise in areas such as chemistry, biotechnology and engineering and undertakes patent and trade mark prosecution work and infringement matters together with transactional work including the negotiation of commercial agreements. It is acting for ASM Technology Singapore in an appeal to the Court of Appeal against a High Court decision regarding patent infringement and validity concerning a patent relating to a process and apparatus to seal electronic components with moulding resin. It is also representing a group of defendants in a dispute pertaining to allegations of copyright infringement and breach of confidence. Alexander Yap is a key name for commercial transactions relating to intellectual property, information technology and the protection and management of data.

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