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Claire Jeffs

Partner; Claire is Co-Chair of the Competition Group globally and works in Slaughter and May’s Brussels and London offices. Claire has extensive experience of both EU and UK competition law. She has been involved in a large number of high-profile merger cases before the EU and UK 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. · Slaughter and May

EnglandCompetition / Antitrust, Merger ControlFrench, Russian, German

About

Claire Jeffs is a partner and Co-Chair of Slaughter and May’s global Competition Group, based in the Brussels and London offices. She has extensive experience in EU and UK competition law, advising on high‑profile merger cases and coordinating worldwide merger approvals, and on the contentious side has acted in cartel and other behavioural cases including on appeal to the General Court in Luxembourg.

Practice areas

Competition / AntitrustMerger ControlInvestigationsMedia & TelecomsDispute ResolutionCompetition Litigation

Office

Expertise

EU and UK competition lawHigh‑profile merger control and global coordination of merger approvalsCartel and behavioural investigations and litigationAppeals before the General Court (EU)Media and telecommunications sector work

Languages

FrenchRussianGerman