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United Kingdom
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Key definition
Article 101 definition

What does Article 101 mean? In practice, Article 101 is the EU competition law rule that bans anti‑competitive agreements and concerted practices—such as cartels, price‑fixing, market‑sharing, bid‑rigging and resale price maintenance—where they prevent, restrict or distort competition and affect trade between EU member States. It covers agreements between undertakings, decisions of associations of undertakings and informal coordination; the test is whether the conduct has an anti‑competitive object or effect. The rule is set out in Article 101 TFEU and developed by Court of Justice case law. Prohibited agreements are void and can attract fines and damages claims. Exemptions may apply under Article 101(3) where...

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Closed UK Chapter I/Article 101 behavioural investigations tracker—CMA, OFT and sectoral regulators (2013 to date)

Practice notes
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This table summarises concluded CMA, OFT and sectoral regulator probes from 2013 brought under Article 101 TFEU/Chapter I of the Competition Act 1998. Only matters placed in the public domain appear here. For live conduct cases, see UK behavioural investigations—ongoing cases tracker. For appeal updates, see UK competition appeals—ongoing cases tracker. For closed Article 102/Chapter II conduct, see UK behavioural investigations—closed cases tracker. For CMA director disqualification actions, see UK competition director disqualifications—cases tracker.

2025 Case name, companies under investigation and industry Competition Authority Issues Developments

  • Housebuilders (51392) — Barratt Developments plc, Bellway plc, The Berkeley Group plc, Bloor Homes Limited, Persimmon plc, Redrow plc, Taylor Wimpey plc and Vistry Group plc — CMA — Anti-competitive arrangements—information exchange
    • Commitments accepted — 30/10/2025
    • Consultation on commitments launched — 09/07/2025
    • Investigation opened — 26/02/2024
  • Atlantic Joint Business Agreement (Case 50616) — IAG (EI, BA, IB), AA and AY — CMA — Anti-competitive arrangements
    • Commitments accepted — 06/08/2025
    • Consultation on modified commitments launched — 03/07/2025
    • Consultation on commitments launched — 28/03/2025
    • CMA to assess the Atlantic Joint Business Agreement in the context of post-COVID recovery in the aviation sector — 28/09/2023
    • Interim measures issued — 04/04/2022...
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Web page updated on 21/05/2026

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