Claire Jeffs

Claire Jeffs
Slaughter and May
One Bunhill Row
+44 20 7090 4031
+44 20 7090 5000

Biography: Competition

Claire was educated at Cambridge and Brussels universities and is resident in London.

She has been involved in a large number of high-profile merger cases before the UK and EU competition authorities, as well as coordinating merger approvals worldwide.

On the contentious side she has been involved in many cartel and other behavioural cases, including on appeal to the General Court in Luxembourg.

Recent highlights include advising: Google in relation to the European Commission's ongoing investigation into search and advertising, Ball on its acquisition of Rexam, Dufry on its acquisition of World Duty Free, and Shire on its takeover of Baxalta.

She has been named in Global Competition Review's "40 under 40", The Lawyer's Hot 100 list and Management Today's "35 under 35" list of high-flying young businesswomen. Claire was also named "Best in Competition/Antitrust" at the Euromoney Legal Media Group's Europe Women in Business Law Awards 2013.

Claire is listed as a leading individual in the competition/European law section of the 2016 edition of Chambers UK and was previously listed as a leading individual in Legal 500 and Chambers Belgium while resident in Brussels. 

Claire is fluent in French and Russian, and has good German.

WWL says: A high profile and universally respected lawyer, she is "one of the leading lights in London"

This biography is an extract from The International Who's Who of Competition Lawyers which can be purchased from our Bookstore.

This profile is taken from Who's Who Legal. For more legal practitioner and firm profiles visit

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