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Welcome to ProlegisProlegis LLC is a premier boutique corporate and commercial law firm in Singapore, advising local and multinational corporations, financial institutions and government entities. Our Formal Law Alliance (FLA) with international law firm Herbert Smith Freehills allows Prolegis' clients seamless access to services across Asia, Australia, Europe, the Middle East and the US. more
Pan Asian ExperienceOur lawyers have more than 50 years' collective experience across Asia with leading international and national law firms, allowing us to act as your legal guide to this complex and diverse region. We work to the highest international standards across matters and jurisdictions, and place particular emphasis on sensitivity to cultural nuances. more
Relationship FocusAt Prolegis, we look to the long term. We invest time getting to know our clients and their businesses. With this understanding, we can tailor our services and their delivery to each client's needs. We are constantly innovating and expanding the scope of value-added services on offer.more
  • 'Prolegis is…….particularly adept in cross-border transactions. Clients highlight its 'extensive experience in complicated corporate matters', 'proactive' approach and 'value-for-money package'.

    (Ranked Leading Firm, Corporate and M&A, Asia Pacific Legal 500, 2018)
  • Ban Leong Oo is praised for his 'intellect, commercial pragmatism and commitment to client service', he 'inspires confidence, is incredibly persuasive in an uncofrontational way and is a smooth and strategic operator'.

    (Ranked Leading Firm, Corporate and M&A, Asia Pacific Legal 500, 2018)
  • ...'smart, hardworking and incisive', 'extremely commercial and pragmatic' and 'a trusted business adviser that adds value beyond what is expected of a traditional legal adviser'.

    (Ranked Leading Firm, Corporate and M&A, Asia Pacific Legal 500, 2018)
  • …'Stands out for the quality of its advice’ and team members that are ‘commercial and have a real depth and breadth of experience’, enabling them to ‘advise not only on the technical legal issues but on market practice

    Ranked Leading Firm, Corporate and M&A, Asia Pacific Legal 500, 2017/18
  • Ban Leong Oo is ‘client-oriented, responsive and the person to go to when market knowledge or strategic decisions are critical’. Safa Zahedi is ‘astute, with a pragmatic approach and fine sense of the commercial realities driving the transaction’.

    Corporate & M&A, Asia Pacific Legal 500, 2017/18
  • ‘Noted Firm’

    Corporate/M&A, Chambers 2017/18
  • Within Allen & Overy [Singapore]'s M&A practice, the firm's star performer. Very thorough. Responsive, meets tight deadlines and provides excellent products.

    Ban Leong Oo - Ranked Leading Lawyer, M&A (Foreign Firms) IFLR 2012
  • …One client notes: 'The lawyer responsible for our files has been Ban Leong Oo. He is very professional, incredibly service-minded and a very good lawyer…Safa Zahedi, also assisted and gave me a solid impression. We also saw willingness to be flexible on rate arrangements and a wish to find an equitable solution'.

    Ranked Leading Lawyer – Mergers & Acquisitions (Foreign Firms) IFLR 2011
  • Sources describe Ban Leong Oo as 'extremely good, reliable and responsive'. He considers every option and thinks things through, and brings more than a decade of cross-border experience to the team. Recent highlights include advising Tyco, in its disposals by separate auctions of various businesses in multiple jurisdictions across Asia.

    Ranked Leading Lawyer – M&A; (International Firms) Chambers 2012
  • …very professional, incredibly service-minded and a very good lawyer………

    Ban Leong Oo - Ranked Leading Lawyer, Mergers & Acquisitions (Foreign Firms) IFLR 2011
  • …Ban Leong Oo is 'extremely understanding of the pressures of running a business'. According to sources, 'he inspires confidence in finding the best course of action to take'.

    Ranked Leading Lawyer, Corporate – M&A; (International Firms) Chambers 2011
  • …Ban Leong Oo continues to impress. "He has come up with practical and creative solutions to complex problems in some very difficult jurisdictions," says one client, while another describes him as "very thorough" and "responsive". "He covers all possible legal and commercial angles when he looks at a problem and he meets tight deadlines. I've been very pleased," adds the client… AsiaLawProfiles 2012

  • …Ban Leong Oo is approachable, prompt and thorough, but the best thing about him is his ability to reconcile our commercial needs with the law', report clients…

    Ranked Up-and-coming Individual, Corporate M&A/International Firms - Chambers 2010
  • …recognised leader in the Group…

    AsiaLawProfiles 2010
  • …Ban Leong Oo wins fans with his responsive and committed approach - you can get him at all hours, and if you say you need an answer, you can count on getting it .… He is also a fine communicator who gets and conveys points very quickly…

    Ranked Up-and-coming Individual, Corporate M&A/International Firms - Chambers 2009
  • …Ban Leong Oo deploys his strong legal expertise with finesse and diplomacy while always keeping his eye on the ball…

    Asia Pacific Legal 500, 2009