CMA Clears Co-operative Group's Acquisition of Southern Co-operative Subject to Store Disposal Undertakings
The Competition and Markets Authority has moved to clear Co-operative Group Limited's completed acquisition of The Southern Co-operative Limited without a full Phase 2 investigation, after proposing to accept a remedies package in lieu of reference. The CMA's Phase 1 decision on 15 September 2026 found the merger had resulted, or may be expected to result, in a substantial lessening of competition in one or more UK markets. Rather than refer the deal for in-depth scrutiny, the CMA on 29 September 2026 concluded there were reasonable grounds to believe that undertakings offered by Co-operative Group, or a modified version, might be accepted under the Enterprise Act 2002. On 12 October 2026, the CMA launched a formal consultation on those proposed undertakings in lieu, which are understood to involve store disposals. The case was opened on 4 June 2026 and an initial enforcement order was served on 23 July 2026 to hold the businesses separate pending clearance. The retail and wholesale grocery sector is the market in focus, with the CMA scrutinising local overlaps between the two co-operative societies' convenience store networks.
Why this matters
The willingness of the CMA to pursue undertakings in lieu, rather than a lengthy Phase 2, signals continued appetite for negotiated structural remedies in completed-deal grocery mergers, particularly where local rather than national competition concerns dominate. The Co-op Group/Southern Co-op combination is the latest test of how the CMA calibrates proportionality when two mission-aligned mutual businesses merge, raising the question of whether co-operative ownership status affects the competitive analysis. If the undertakings are accepted, the case will confirm that targeted store disposals remain the CMA's preferred tool for resolving local overlap concerns in convenience retail, a market already under consolidation pressure. The outcome will be watched closely by other regional co-operative societies and by private equity-backed convenience chains eyeing similar roll-up strategies.
On the Ground
The case activates competition law advice on merger control and remedies design, alongside corporate and real estate work on identifying, ringfencing, and ultimately divesting the overlap stores. Counsel and economists will be needed to advise on the scope and sufficiency of the undertakings offered. A trainee would be expected to monitor the CMA case page for remedy consultation responses and deadline updates, prepare summaries of derogations granted under the initial enforcement order, and assist in due diligence on sites identified for disposal.
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“What does the CMA's decision to pursue undertakings in lieu rather than a Phase 2 reference tell us about how it approaches competition concerns in completed grocery mergers?”
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