Platypus: UK Merger Control Analysis

Like the duck-billed egg-laying mammal the platypus (ornithorhynchus paradoxus), the UK’s merger control regime confounds neat classification.

A “voluntary” regime for sellers – that isn’t voluntary for buyers; and a “non-suspensory” regime that allows deals to complete before clearance, but imposes hold separate orders that make other regimes' gun-jumping rules look tame. As regimen paradoxum it is the rare monotreme among the world’s mammals of merger control. A successful encounter in the wild requires careful planning and a healthy respect for its habitat and way of life.

Platypus is our digital platform for UK merger control analysis:

The stats modules, updated fortnightly, focus on Phase 2 and Phase 1 outcomes, showing data from 1 January 2024 - 31 October 2025 (and comparative stats for 2020-2024), and, on the procedural side, a league table of fines imposed in merger cases since the first case in mid-2018.
We also publish analysis on UK merger control, following the themes du jour, including UK/EU divergence, UK merger control process, and the CMA's approach to assessment of both competition issues and remedies that could solve them.

Platypus’ sister platform Rhino offers the same for EU merger control (and UK v. EU Deal Mortality stats are available here).

UK Merger Control Cases and Statistics

This data is updated fortnightly

Phase 2 Outcomes

Period 1 January 2024 to 31 October 2025

Deal mortality and remedies endgames in UK Phase 2 (set of 10 cases – substantive outcomes at Final Report stage):

30% result in deal mortality (comprising prohibition, unwind, and deal abandonment upon referral or during Phase 2); this compares to 54% for the period from 1 January 2020 - 31 December 2024;
60% result in "intervention" in the sense of deal mortality or imposition of remedies, with 40% unconditionally cleared; this 60:40 split compares to a 76:24 split for the period from 1 January 2020 - 31 December 2024 .

Completed deals going to Phase 2 (set of 11 cases – all Phase 2 cases):

45% of cases sent to Phase 2 are completed deals, i.e. subject to hold-separate orders (IEOs) etc. and risk of substantive intervention (2 deal unwinds in the period); this compares to 40% for the period from 1 January 2020 - 31 December 2024.

Parallel Review:

Following the UK's departure from the EU, the one-stop-shop principle (whereby cases notified to the European Commission need not be notified to individual EU Member States) ceased to apply to the UK, creating the possibility of parallel EU/UK review.
18% of Phase 2 cases have been / are being reviewed in parallel by the European Commission and the CMA (2 total).

Statistical definitions and more detail on our core stats modules can be found here

Platypus Phase I stats

Click on the link for our analysis on Phase I outcomes

Platypus Phase II stats

Click on the link for our analysis on Phase II outcomes

Platypus - Fines

Click on the link for our analysis on CMA Fines in Merger Control cases