Department profile
CMS

Competition Law

UK Guide 2026 : London (Firms)

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CMS

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Provided by CMS

Please visit the CMS website for more details about the practice and our work:

Antitrust, Competition & Trade | UK | International law firm CMS

Chambers Review

Provided by Chambers

Competition Law - London (Firms)

Band 4

What the Team is Known For

CMS assists clients with the competition aspects of corporate transactions, including obtaining merger clearance and NSIA approval. The law firm also advises on CMA behavioural investigations and assists with subsidy control and compliance issues. The team is also able to represent clients in competition law disputes, often collaborating with members of the firm's litigation department. The London office of CMS often works alongside the law firm's other offices across the UK and globally on competition law matters.

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Work Highlights

Provided by Chambers

  • CMS advised Fox Media on merger control filings in connection with a proposed sports streaming service with Warner Bros Discovery and Disney.

Strengths

Provided by Chambers

  • The team always provide pragmatic, strategic advice.

    Competition Law respondentUK

  • CMS is distinguished by its breadth of experience and regulator relationships, which you would expect from a leading team but with a commercial and client-friendly approach.

    Competition Law respondentUK

  • CMS was responsive and demonstrated deep expertise combined with commercial awareness.

    Competition Law respondentUK

  • CMS provides broad coverage over a number of key jurisdictions and has expert knowledge of our sector.

    Competition Law respondentUK

  • We appreciate the team's commercial acumen and pragmatism in a complex area.

    Competition Law respondentUK

Notable Practitioners

Provided by Chambers

  • Brian Sher
    Brian Sher

    Brian Sher

    Brian Sher acts for clients that are subject to CMA investigations, including in the transportation and media sectors. He has further experience in competition law compliance mandates, including around subsidy control and advertising issues.

    • Brian Sher is a wonderful, technical black letter competition lawyer.

      Competition Law respondentUK

    • He was extremely knowledgeable, provided a nice client service, responded quickly and took a very commercial approach.

      Competition Law respondentUK

    • Brian Sher is an industry expert with a deep understanding of the law and processes involved.

      Competition Law respondentUK

    • He is an all-round excellent lawyer, who is held in high regard both with me and my key stakeholders.

      Competition Law respondentUK
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  • Jacqueline Vallat
    Jacqueline Vallat

    Jacqueline Vallat

    Jacqueline Vallat enters the rankings this year on the back of her broad competition law practice, that covers both acting for clients on merger control and foreign investment control matters, as well as representing them in investigations into alleged cartels.

    • I think she's very good.

      Competition Law respondentUK

    • Jacqueline Vallat was a pleasure to work with. She provided both legal assurances and commercial insights.

      Competition Law respondentUK

    • She is really excellent. She's very practical and good at cutting through the noise and talking sense.

      Competition Law respondentUK
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Ranked Individuals at CMS (2)

London (Firms)

Members

Provided by CMS

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