Corporate Report: Competition Act 1998: Public Register of Decisions

Why It Matters

The register’s ongoing updates signal rigorous antitrust oversight, affecting market dynamics for major sectors like construction, energy, pharma, and technology. Visibility into investigations helps companies assess compliance risk and adapt strategies accordingly.

Key Takeaways

• Register tracks Competition Act decisions since 2014
• Amazon seller data and Meta data use investigations added 2023
• Housebuilder and SGN probes entered April 2026
• Vifor Pharma joint‑venture scrutiny added September 2025
• Public register enhances transparency of UK competition enforcement

Pulse Analysis

The Competition Act 1998 requires the UK Competition and Markets Authority (CMA) to maintain a public register of its enforcement decisions, offering stakeholders a clear view of antitrust activity. Since its inaugural publication in March 2014, the register has become a vital tool for legal teams, investors, and policy analysts, chronicling everything from routine market reviews to high‑stakes investigations. By cataloguing each decision, the CMA promotes accountability and deters anti‑competitive conduct across industries.

Recent updates underscore the register’s relevance to today’s most scrutinized sectors. In April 2026, the CMA added investigations into major housebuilders and energy distributor SGN, reflecting growing concern over consolidation in construction and utilities. The 2025 entries on Vifor Pharma and the Atlantic Joint Business Agreement highlight the regulator’s focus on pharmaceutical pricing and cross‑border collaborations. Notably, the December 2023 addition of Amazon’s third‑party seller data probe and Meta’s data‑use case illustrates how digital platforms are now front‑and‑center in competition enforcement.

For businesses, the register functions as an early‑warning system. Companies can monitor emerging enforcement trends, benchmark their own practices against identified risks, and adjust compliance programs before formal action is taken. Moreover, investors use the data to gauge regulatory exposure, which can influence valuation and strategic decisions. As the CMA continues to expand the register, its role in shaping competitive behavior and informing market entry strategies will only grow, making it an indispensable resource for anyone operating in the UK market.