Calum Warren

Latham & Watkins (London)
Lawyer (Associate)

Calum Warren is an associate in the Litigation Department of Latham & Watkins and a member of the global Antitrust and Competition Practice in London. Mr. Warren represents clients in complex multi-jurisdictional merger control proceedings and antitrust investigations in a broad range of business sectors, notably FMCG, media and technology, oil & gas and chemicals, aviation, pharmaceuticals, and medical devices.


Linked authors

Vinge (Stockholm)
Latham & Watkins (Hambourg)
Latham & Watkins (London)
British Competition Authority - CMA (London)
Latham & Watkins (Washington)


893 Bulletin

Calum Warren, Jana K. Dammann De Chapto, John Colahan, Jonathan Parker, Steven Croley The UK Government adopts new powers to investigate smaller merger transactions which raise national security concerns


The expansion of the UK government’s foreign investment review powers will require additional scrutiny of potential deals for the early identification of additional steps in the regulatory approval strategy. Key Points: The new UK rules are part of a wider global trend, with heightened (...)

John Colahan, Calum Warren The UK Competition Appeal Tribunal grants an application by the claimant in a damages action in the automobile industry for disclosure of licensing arrangements made by the defendant (Peugeot / NSK)


CAT Rules on Disclosure in Peugeot S.A. and others v NSK Ltd and others* The CAT’s specific disclosure ruling addresses the use of licensing to support anticompetitive behaviour. On 2 March 2018, the Chairman of the UK Competition Appeals Tribunal (CAT) granted an application for further (...)

Calum Warren, Grant McKelvey The UK Competition Appeal Tribunal upholds the OFT’s jurisdiction to review the acquisition of a minority shareholding in a merger in the airline sector (Ryanair / Aer Lingus)


I. Introduction On 28 July 2011 the Competition Appeal Tribunal (“CAT”) handed down a unanimous judgment, upholding the UK Office of Fair Trading’s (“OFT”) jurisdiction to review Ryanair‘s 29.8% minority shareholding in rival Irish airline Aer Lingus, which the former acquired almost five years ago. (...)

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