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Mayer Brown

Work +85 2 2843 2211
Fax +85 2 2845 9121

Hannah Ha

Work +852 2843 4378
Mayer Brown

Work Department

Antitrust & Competition, Corporate/M&A.


Hannah Ha is a partner of the Corporate & Securities practice of Mayer Brown in Hong Kong. Hannah’s primary practice focuses on mergers and acquisitions and she has extensive experience in foreign direct investment in China, cross-border mergers and acquisitions, private equity transactions and general corporate and commercial matters.

Hannah advises 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.

Consistently recognised by independent commentators, IFLR1000 2014 describes Hannah as “extremely dedicated and competent” and clients say “it was an enriching experience to work with her". She has also been named leading lawyer for Mergers and Acquisitions by Expert Guides: Women in Business Law in 2014-2016 and leading Corporate/M&A Lawyer by Chambers Asia Pacific 2011-2017.

Hannah’s practice also covers competition law, and she co-heads the firm's award winning Antitrust & Competition Team in Asia. 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.


Admitted in Hong Kong, England & Wales, Australia - Tasmania, Australia - Victoria, Australia - New South Wales, Australia - Queensland, New Zealand, and New York.


English, Cantonese and Mandarin.


The University of Warwick, MBA; The University of Hong Kong, PCLL; The University of Hong Kong, LLB.

Hong Kong

Antitrust and competition

Within: Antitrust and competition

Co-headed by Hannah Ha and John Hickin, Mayer Brown's two-partner Hong Kong team is a pivotal practice that provides a coordinated service, alongside other Asian offices, to clients from a range of industry sectors including real estate, telecoms and manufacturing on their pan-Asian competition law concerns. Leveraging the firm’s strong global corporate M&A practice, the team is a vital resource for clients on accompanying merger control clearance work. Particularly accomplished on the advisory front, Ha is well-versed in the changing complexion of antitrust law in Hong Kong and other Asian jurisdictions, and is well-regarded by clients for successfully handling a range of M&A merger clearance matters, general compliance work and advisory assistance. Leveraging his broad-ranging litigation skills, Hickin is more focused on contentious antitrust matters and has represented numerous clients in investigations initiated by the Hong Kong Competition Commission.

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