Asia Chair, Member of Management Committee, Co-leader of Corporate & Securities

Hannah C. L. Ha

Antitrust & Competition, Mergers & Acquisitions, Private Equity

"Extremely professional and wise, with great commercial sense and a wonderful personality. What else can a client ask for?"


Hannah is the Asia Chair and serves on the global Management Committee of Mayer Brown. She is a partner of the Corporate & Securities practice based in Hong Kong and a co-leader of the global Corporate & Securities practice. Clients turn to Hannah Ha for advice on mergers and acquisitions, leveraging her extensive experience in foreign direct investment in China, cross-border mergers and acquisitions, private equity transactions and general corporate and commercial matters. Hannah's practice also covers competition law, and she co-heads the firm's award winning Antitrust & Competition Team in Asia.

Hannah advises a wide range of clients, including sovereign wealth funds, blue-chip companies, multi-national corporations and mainland Chinese companies. Her industry experience is wide-ranging, including aviation, chemicals, construction, consumer products, pharmaceuticals, transport, financial services and real estate.

Hannah is a China-Appointed Attesting Officer (appointed by the Ministry of Justice of PRC) and a Notary Public in Hong Kong. She speaks English, Cantonese and Mandarin.


M&A Experience


  • A French ecological transformation company on its takeover of a French utility company which operates largely in the water and waste management sectors. More than 150 Mayer Brown lawyers in various jurisdictions globally assisted the transaction.
  • Alpargatas S.A., a Brazil-based, global footwear company creator of the famous flip flop "Havaianas," in its $475 million Series B investment in Rothy's, Inc., a San Francisco-based online retailer of eco-friendly footwear, bags and accessories. The Mayer Brown team included lawyers across multiple practices and offices in the US, Brazil and Asia.
  • A leading operator in the courier express parcel market in Europe on the regulatory aspects of the acquisition of a United Arab Emirates-based multinational logistics, courier and package delivery company. The Mayer Brown team included lawyers across multiple practices and offices in Europe and Asia.
  • A leading global bank on its acquisition of an insurance broker in Hong Kong, which in turn acquired another insurance broker in Mainland China under the Mainland and Hong Kong Closer Economic Partnership Arrangement (CEPA).


  • Expert, Competition and Antitrust – Expert Guides: Women in Business Law (2012, 2014, 2016, 2021)
  • Leading Individual - Competition/Antitrust, China (International Firms) – Chambers Global (2012-2023)
  • Leading Individual - Competition/Antitrust, China (International Firms) – Chambers Greater China Region (2022, 2023)
  • Leading Individual - Competition/Antitrust, China (International Firms) – Chambers Asia Pacific (2009-2021)
  • Recommended - Corporate and M&A: Foreign Firms, China – The Legal 500 Asia Pacific (2021, 2022). Described Hannah as “well-positioned to guide local clients through investigations initiated by the Competition Commission, while on the non-contentious side, as well as her regular involvement in merger clearance work, Ha also assists multinational corporations to implement compliance programmes for antitrust and anti-corruption in Asia”.
  • Recommended - Corporate (Including M&A), Hong Kong – The Legal 500 Asia Pacific (2020-2024)


  • The University of Warwick, MBA
  • The University of Hong Kong, PCLL
  • The University of Hong Kong, LLB


  • New York
  • New Zealand
  • Australia, Queensland
  • Australia, New South Wales
  • Australia, Victoria
  • Australia, Tasmania
  • England und Wales
  • Hong Kong


  • Englisch
  • Kantonesisch
  • Mandarin


  • Standards and Development Committee, Hong Kong Society of Notaries
  • Council Member, Hong Kong Society of Notaries
  • Member, Competition Law Working Group, Association of China-Appointed Attesting Officers & Society of Notaries
  • Member, Disciplinary Committee of Association of China-Appointed Attesting Officers
  • Member, New York Bar Association
  • Member, Chartered Institute of Arbitrators  
  • Member, Executive Committee of the Hong Kong Competition Association