Guidance

Make a whistleblower report

Guidance

Tell onthe howCompetition toand reportMarkets whistleblowingAuthority to(CMA) theabout Competitionsuspected andwrongdoing Marketsby Authority

your current or former employer.

Updates to this page

From:
Competition and Markets Authority
PublishedPublished:
23 November 2023
Last updated:
2 October 2026
Show all updates

  1. Guidance on whistleblowing to the CMA updated.

  2. First published.

Use this service to tell the Competitionthe CMA andabout Marketsyour Authorityemployer (CMA)(or aboutex-employer) anypossibly suspectedbreaking illegalcompetition activities or suspiciousconsumer behaviourlaw. 

Before carriedyou outstart 

Before by the business or organisation you aremake employedyour byreport, orread wereour previouslyguide employedto by.

Tellwhistleblowing. usIt if you believe the business has:explains:

  • participatedwhat inyou cartelcan activitytell us about 
  • brokenhow competitionto lawprepare a report 
  • usedhow unfairwe’ll tradinghandle practices

Anonymity

Asyour partinformation of(including youranonymity report,and youconfidentiality)  

  • what canhappens chooseafter toyou providemake contacta detailsreport 
  • who toelse usyou orcan remainreport anonymous.

    to 

    • DueYou tocan theonly volumemake ofa submissions,whistleblower report to the CMA can’tif respondyou directlysuspect toa everybusiness reporthas webroken receive,competition howeveror weconsumer monitorlaw. informationIf providedyou andwant taketo actionreport wheresomething appropriate.

    Aselse, acheck resultthe list of yourother report,bodies weand may:

    InformationMake youa will need to providereport 

    You willStart notnow be

    If ableyou todon’t savewant your submission and come back to ituse later,this soform, it’s important you havecan thesecall ready:

    way.

    Telephone: Start020 now3738 6556 

    Email address: whistleblower@cma.gov.uk

    Published

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