Kio Gwilliam

Kio Gwilliam

  • Senior Associate
  • London
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Kio specialises in competition litigation, data protection claims and commercial disputes. He was promoted to Senior Associate in January 2022.


In addition to representing clients in large scale competition disputes with Big Tech corporations, Kio is currently part of the legal team advising:

  • Duncan McCann in his representative action on behalf of affected children and parents against Google for various data breaches on the YouTube platform, the UK’s first representative data breach action of its kind.
  • Justin Gutmann in his competition collective claim against various train operators for abuses of their dominant positions, the UK’s first standalone competition collective claim of its kind.

In addition to various commercial and pro bono matters, Kio was part of the legal team acting for over 100 claimants in the Air Cargo litigation against British Airways in the High Court and Court of Appeal.

Prior to joining Hausfeld, Kio trained at Berwin Leighton Paisner LLP and undertook a 3-month competition secondment in Brussels. 


Kio has experience representing clients on a range of antitrust, competition and data protection issues across a variety of sectors, including technology, utilities and transport.