London, September 15, 2026. The UK Competition and Markets Authority (CMA) said on Tuesday that Co-op Group’s takeover of Southern Co-op may be expected to result in a substantial lessening of competition, and gave the two societies until September 22 to offer remedies or face an in-depth Phase 2 investigation. The finding is narrow: it centres on convenience grocery competition in local areas around nine Co-op Group stores and ten Southern Co-op stores, plus one overlapping pair of funeral sites. Both parties conceded the point rather than contest it, a procedural choice that pulled the decision forward from the CMA’s original September 28 statutory deadline.
The ruling lands seven weeks after the deal completed. Southern Co-op’s business was transferred into Co-op Group on July 26, 2026 by way of a statutory transfer of engagements, and it now sits inside a wholly owned subsidiary called Siena Co-operative Limited while continuing to trade under the Southern Co-op name. Because the CMA served an initial enforcement order on July 23, the two businesses have been held apart operationally throughout the review, which is why Co-op Group could tell staff and members on Tuesday that there are “no changes for colleagues, members or customers at this stage.”
In short
- The decision: on September 15, 2026 the CMA found that the completed acquisition of Southern Co-op by Co-op Group “may be expected to result in a substantial lessening of competition” in the UK (case ME/7150/26).
- The overlaps: convenience grocery in local areas centred on 9 Co-op Group stores and 10 Southern Co-op stores, plus attended at-need and pre-paid funeral services in local areas around one Co-op Group site and one Southern Co-op site.
- The deadline: the parties have until September 22, 2026 to offer undertakings in lieu (UILs). If none are offered or they fall short, the CMA refers the merger to Phase 2 under sections 22(1) and 34ZA(2) of the Enterprise Act 2002.
- What was cleared: the CMA found no realistic prospect of harm from the merged group restricting rival funeral directors’ access to Southern’s crematoria, because it would have no incentive to do so.
- The context: Southern Co-op told its 330,000 members in April that the most likely alternative to the merger was insolvency, after three consecutive years of losses on sales of about GBP 544 million (about USD 733 million at current rates).
What did the CMA actually decide on September 15?
The CMA’s summary of its Phase 1 decision, published on the case page on Tuesday, sets out a finding that is unusual in one respect. The regulator did not have to prove its case. During the Phase 1 investigation “the Parties formally conceded that the test for reference is met,” the summary says, on the basis that the merger gives rise to a realistic prospect of a substantial lessening of competition (SLC) as a result of horizontal unilateral effects in two product markets.
Those two markets are the retail supply of groceries in convenience stores, and the supply of attended at-need and pre-paid funeral services. In both cases the geographic frame is local: the CMA assesses whether shoppers or bereaved families in a given catchment would be left with fewer meaningful choices once the two societies stop competing. The CMA’s conclusion is that in 19 convenience-store catchments and one funeral catchment, they would.
Co-op Group’s response leaned on what the regulator did not find. “We welcome the update from the Competition and Markets Authority regarding its Phase 1 review of the proposed Southern Co-op transaction,” the group said in a statement carried by Talking Retail. “We are pleased that, as anticipated, the CMA hasn’t identified competition concerns at a national level.” The group added that it “will continue to engage and work with the CMA on the proposed remedies.”
Why the case moved faster than the statutory timetable
The CMA’s formal Phase 1 inquiry opened on July 30, 2026, which set a 40-working-day statutory deadline of September 28. The decision arrived 13 days early because, according to the decision summary, “the Parties requested that the case be fast-tracked to the consideration of undertakings in lieu.” Under the CMA’s mergers procedure, a merging party can concede a realistic prospect of an SLC in defined local areas in order to skip straight to negotiating remedies, rather than spending weeks contesting a finding it expects to lose anyway.
That is a rational choice for a buyer that already owns the target and wants to start integrating it. Every week under an initial enforcement order is a week in which Co-op Group cannot merge buying, logistics, IT or store management with a business it has already absorbed on paper. The concession trades a small number of local divestments for the prospect of a clean exit from the review inside weeks rather than months.
Where exactly do the overlaps sit?
The CMA has not published the list of affected stores in the summary released on Tuesday; that level of detail usually appears in the full Phase 1 decision text, which follows later. What the summary does say is that the concern is “centring around nine CGL convenience stores and 10 Southern convenience stores.” In CMA practice, each of those 19 stores anchors a local catchment in which the merged entity’s combined share, and the number of remaining rival fascias, breach the regulator’s screening thresholds.
Southern Co-op is a regional society. It was founded as the Portsea Island Society in Portsmouth in 1873 and operates across the south of England, with a heavy concentration in Hampshire, Dorset, Sussex and the Isle of Wight, according to the society’s own merger documentation. Co-op Group runs more than 2,300 food stores nationally, so the overlaps are, by construction, the towns and suburbs in that southern belt where both fascias sit within a short drive of each other and few other convenience operators do.
The funeral overlap
The second overlap is easy to overlook but matters to the remedy design. Both societies are large funeral directors: Co-op Group operates roughly 800 funeral homes nationally, and Southern Co-op runs 69 funeral homes, three crematoria and four burial grounds. The CMA found a realistic prospect of an SLC in attended at-need and pre-paid funeral services in one local area, centred on one Co-op Group site and one Southern Co-op site.
The CMA also examined a vertical theory of harm. Because Southern owns crematoria, the regulator asked whether the merged group might restrict rival funeral directors’ access to those facilities in order to advantage its own funeral branches. It concluded that the merger “does not give rise to a realistic prospect of an SLC as a result of input foreclosure,” because the evidence showed the merged entity “would not have the incentive to foreclose.” That clears the crematoria from the remedy conversation.
| Concern examined by the CMA | Finding | Scope |
|---|---|---|
| Convenience grocery, local competition | Realistic prospect of SLC (conceded by parties) | Local areas around 9 Co-op Group stores and 10 Southern Co-op stores |
| Attended at-need and pre-paid funeral services, local competition | Realistic prospect of SLC (conceded by parties) | Local areas around 1 Co-op Group site and 1 Southern Co-op site |
| Foreclosure of rival funeral directors from Southern’s crematoria | No realistic prospect of SLC | Merged entity lacks the incentive to foreclose |
| National grocery or funeral competition | No concern identified | Co-op Group statement: no concerns “at a national level” |
What happens between now and September 22?
The Enterprise Act gives merging parties five working days from an SLC decision to offer undertakings in lieu of a reference. Counting from Tuesday, that lands on Monday, September 22, 2026, which is the date in the CMA’s summary. The parties are not obliged to offer anything; if they stay silent, the reference to Phase 2 is automatic. If they do offer UILs, the CMA must decide within a further short window whether there are reasonable grounds for believing the package might be acceptable, and then consult publicly before formally accepting it.
Under the CMA’s published timetable for Phase 1 remedies, the whole process from SLC decision to formal acceptance normally runs to about 50 working days, extendable by up to 40 more where the CMA needs time to approve a purchaser. That means a realistic outside date for final sign-off of early-to-mid December 2026, assuming the parties table a credible package on or before September 22 and the CMA does not need a second round.
What a remedy package would look like
At Phase 1 the CMA accepts only remedies that are “clear-cut” and capable of resolving the concern without further investigation. In local retail cases that almost always means structural divestment: the merged group sells specified stores to an independent buyer approved by the CMA, rather than promising to hold prices or keep a fascia open. Behavioural promises are rarely accepted at this stage because the regulator cannot police them cheaply.
Given that the CMA’s concern is framed around 19 stores, the parties’ offer would typically involve selling one store from each overlapping pair, or in some catchments both, so that an independent operator restores the choice that the merger removed. In practice the divestment count is often lower than the number of stores named, because the CMA measures the concern per catchment and one sale can fix two overlapping areas. Which stores go, Co-op Group’s or Southern Co-op’s, is a commercial choice for the seller, subject to the buyer being able to run them as a viable competitor.
Who buys 19 convenience stores in southern England?
The buyer question is where Phase 1 divestments most often stall. The CMA insists on an “upfront buyer” in cases where it doubts a purchaser will emerge, and the store estate has to be sold as a going concern to an operator with the scale and supply arrangements to compete. The natural candidates in UK convenience are the symbol-group wholesalers and their larger retailers (Nisa, Spar, Premier and Londis franchisees), regional multiples, and forecourt operators that have been buying convenience sites aggressively.
Southern Co-op is itself a franchisor: it supplies 77 Welcome-branded franchise stores alongside its 173 company-owned food stores. That gives the merged group an unusual option of selling overlapping company stores to existing franchise operators, though the CMA would look closely at whether a buyer that depends on the seller for supply is genuinely independent.
The Phase 2 alternative
If no acceptable package emerges, the merger goes to a Phase 2 investigation by an independent inquiry group, with a 24-week statutory timetable that can be extended by eight weeks. A Phase 2 would keep the initial enforcement order in force into spring 2027 and would reopen the whole case, not just the 19 stores. For a buyer that has already completed and wants to run the target, that is the outcome to avoid, and the parties’ concession on Tuesday signals that they intend to avoid it.
How has the CMA handled grocery deals before?
The CMA’s track record in grocery mergers is a useful guide to what a fast-track remedy looks like. Most local-overlap cases at Phase 1 end in accepted divestments, while the two biggest national deals of the past decade went to Phase 2 with opposite outcomes.
| Deal | Year | Stage reached | Outcome |
|---|---|---|---|
| Tesco / Booker | 2017–2018 | Phase 2 | Cleared unconditionally |
| Co-op Group / Nisa Retail | 2018 | Phase 1 | Cleared unconditionally |
| Sainsbury’s / Asda | 2018–2019 | Phase 2 | Blocked |
| Morrisons / McColl’s | 2022 | Phase 1 with UILs | Divestment of 28 stores accepted |
| Asda / Co-op Group petrol forecourts | 2022 | Phase 1 with UILs | Divestment of 13 sites accepted |
| Co-op Group / Southern Co-op | 2026 | Phase 1 SLC finding, UILs due September 22 | Pending |
The Morrisons acquisition of McColl’s is the closest precedent. There, the CMA identified local concerns in 35 areas and accepted the sale of 28 convenience stores as a Phase 1 remedy, with the whole process completing within a few months of the initial decision. The Asda purchase of Co-op Group’s forecourt estate is instructive for a different reason: it shows Co-op Group has been on the selling side of a CMA divestment remedy before, and knows how the buyer-approval process works.
Regular readers will recall that the same regulator has spent much of 2026 on the structural side of grocery competition, notably its move to curb the land agreements that Aldi and Lidl use to block rival stores. That work and this merger review share a premise: in UK grocery, competition is won and lost catchment by catchment, not in national market-share tables.
Why did Southern Co-op need this deal?
The merger was never framed as a growth play. When the two societies announced it on April 8, 2026, Southern Co-op told members that the alternative was, in the society’s own words, that “the most likely outcome is that Southern Co-op will enter insolvency.” The society had reported three consecutive years of losses and said it had “relied on ongoing support from our banks and suppliers to continue operating,” support that “cannot now be increased.”
The numbers behind that warning are modest by national grocery standards but severe for a regional mutual. According to Southern Co-op’s merger documentation, the society lost GBP 4.5 million in 2024 on sales of GBP 543.9 million, after a GBP 2.6 million loss in 2023 on sales of GBP 545.8 million. At Tuesday’s rate of about USD 1.35 to the pound, that is a 2024 loss of roughly USD 6.1 million on revenue of about USD 733 million.
| Metric | Southern Co-op | Co-op Group |
|---|---|---|
| Food stores | 173 company-owned plus 77 Welcome franchise stores | More than 2,300 |
| Funeral homes | 69, plus 3 crematoria and 4 burial grounds | About 800 |
| Other businesses | 83 Starbucks coffeehouses under franchise | Wholesale supplying about 8,000 outlets, insurance, legal services |
| Members | About 330,000 | About 7 million |
| Latest disclosed annual sales | GBP 543.9m (about USD 733m) | Combined group sales after merger about GBP 11.5bn (about USD 15.5bn) |
| Home region | South of England, from 1873 | National, Manchester-based |
Members backed the transaction in two special general meetings, as co-operative rules require for a transfer of engagements. The first, on May 6, 2026, returned 97.07 percent in favour; the confirmatory vote later in May returned 97.8 percent on a turnout of 16,091 members, according to The Grocer and Talking Retail. A campaign group calling itself Save Our Southern opposed the deal and argued for alternatives, but never came close to the threshold needed to block it.
The mutual-sector backdrop
Southern Co-op’s difficulties are not unique. Smaller UK retail societies have been consolidating into Co-op Group or into larger regional peers for two decades, squeezed by the same cost pressures independent shops report: energy, wages, employer national insurance, business rates and shoplifting. The pressures that the convenience sector documented in the ACS Local Shop Report 2026, where the sector’s rates bill has nearly doubled in two years while investment stalled, bear directly on a 173-store operator with thin margins and a regional footprint.
What does the merger mean for Co-op Group?
For Co-op Group, Southern is an in-fill acquisition in a region where it was comparatively under-represented. Interim chief executive Kate Allum called completion in July “a historic milestone for both societies and the wider co-operative movement,” pointing to more than 300 years of combined co-operative heritage. Chair Debbie White has been on the group side of the deal since April.
The structure is worth understanding because it shapes what the CMA can and cannot order. Under a transfer of engagements, Southern Co-op as a legal society passed its business into Co-op Group, which placed it inside Siena Co-operative Limited, a wholly owned subsidiary. Southern Co-op keeps trading under its own fascia, and the initial enforcement order requires it to be run as a standalone business until the CMA is satisfied. The CMA granted a series of derogations from that order on July 29 and 30, August 13, 17 and 26, and September 3, which typically allow limited coordination on matters such as banking facilities, insurance or supplier contracts without integrating the businesses.
What integration has been waiting for
The obvious synergies are in buying and supply. Co-op Group’s wholesale arm already supplies roughly 8,000 outlets, and folding 173 company stores and 77 franchise stores onto that platform is the kind of volume gain that a distressed regional society could not achieve alone. The funeral side is similar: 69 branches join an estate of about 800. None of that can start in earnest while the enforcement order stands, which is the commercial reason the parties chose to concede at Phase 1 and get to remedies quickly.
A remedy that sells a dozen or so stores out of a combined estate of more than 2,500 is a rounding error on scale, but a real cost in the specific towns affected. Each divested store is a location Co-op Group would otherwise have kept, and each remaining pair of nearby stores would have been rationalised over time in any case. The CMA’s process forces that rationalisation to happen through a sale to a rival rather than a closure.
What does it mean for shoppers, staff and rival retailers?
For customers, nothing changes yet. Both fascias continue to trade, prices are set independently under the enforcement order, and Southern Co-op members retain their benefits during the transition period, according to the society’s merger documentation. The CMA’s concern is prospective: it is about what would happen in 19 catchments once the businesses combine, not about anything that has already occurred.
For staff, the picture is governed by the terms already agreed. Colleagues transferred under TUPE regulations, which protect existing terms and conditions, and Co-op Group has said it intends to retain as many stores and funeral homes as possible. A divestment remedy would move employees of the sold stores to the acquiring retailer, again under TUPE, rather than making them redundant.
For rivals, the decision is an opportunity. Any convenience operator with a presence in the south of England now knows that a small package of established, trading stores in overlapping catchments is likely to come to market within weeks, with a seller under regulatory pressure to complete. The discount and convenience operators that have been expanding into the region, and the forecourt groups that have been buying convenience sites, are the obvious bidders. It is the same logic that has made distressed UK store estates attractive to consolidators elsewhere on the high street this year.
The local competition test in practice
The CMA’s local screening for grocery looks at drive-time catchments around each store and counts the “effective competitors” that remain after a merger. In a town where Co-op and Southern Co-op are the only two convenience operators within a short drive, the merger removes the only rival, and the regulator treats that as a presumption of harm. In a town with a Tesco Express, a Sainsbury’s Local and a symbol-group store as well, the same merger removes one of several rivals and typically clears.
That is why the number of stores flagged, 19 out of a combined estate of more than 2,500, is small. The concern is not that Co-op Group becomes too big in convenience nationally; its share there is well below the levels that would trouble the regulator. The concern is that in a handful of villages and suburbs on the south coast, shoppers would be left with a single fascia for a top-up shop.
How does this fit the CMA’s wider grocery agenda?
The CMA’s 2026 grocery work has two strands that converge on this case. The first is the enforcement of the Groceries Market Investigation Order rules on land agreements, where the regulator has gone after the restrictive covenants that large chains use to keep rivals out of nearby sites, the subject of the Aldi and Lidl property rules reckoning this summer. The second is merger control, where the regulator reviews any deal that could reduce the number of fascias competing in a local catchment.
Both strands rest on the same finding from the CMA’s earlier market investigations: UK grocery pricing and service quality respond to local competition, so a regulator that wants to protect shoppers has to look at store-level maps rather than national league tables. In that framework, a regional co-operative merger with 19 flagged stores is handled the same way as a national chain’s covenant portfolio, one catchment at a time.
The decision also arrives while the sector’s expansion story is dominated by discounters. Aldi is opening a store a week in September on its way to a 1,500-shop target, and Lidl continues to add sites. Every new discounter store inside a Co-op or Southern Co-op catchment adds an effective competitor and, over time, reduces the number of overlaps a regulator would flag. The CMA assesses the market as it stands at the time of the decision, however, not as it may look in 2027.
Key dates to watch
| Date | Event |
|---|---|
| April 8, 2026 | Co-op Group and Southern Co-op announce the proposed transfer of engagements |
| May 6, 2026 | First Southern Co-op special general meeting: 97.07% in favour |
| Late May 2026 | Confirmatory vote: 97.8% in favour, 16,091 members voting |
| June 4, 2026 | CMA invitation to comment issued (open to June 18) |
| July 23, 2026 | CMA serves initial enforcement order |
| July 26, 2026 | Transfer of engagements completes; Southern’s business moves into Siena Co-operative Limited |
| July 30, 2026 | Formal Phase 1 inquiry launched (statutory deadline September 28) |
| September 15, 2026 | Phase 1 decision: realistic prospect of SLC in 19 convenience-store catchments and one funeral catchment |
| September 22, 2026 | Deadline for the parties to offer undertakings in lieu |
| Late September 2026 | CMA decides whether any UILs offered are capable of acceptance; public consultation follows if so |
| Q4 2026 | Formal acceptance of UILs and buyer approval, or reference to Phase 2 |
The CMA maintains the full public record of the case, including the initial enforcement order, each derogation and the Phase 1 summary, on its Co-operative Group / Southern Co-operative merger inquiry page. The full text of the Phase 1 decision, with the list of affected local areas, is expected to be published there after confidentiality redactions.
What is the bottom line?
This is a remedy negotiation, not a threat to the deal. The merger has already completed, the CMA has found no national concern, and the parties chose to concede a handful of local overlaps to get to the remedy stage fast. The next signal to watch is whether a UIL package is tabled by September 22 and whether the CMA judges it capable of acceptance in the days that follow. If it does, expect a short public consultation, a buyer-approval process and a formal acceptance before the end of the year, at which point Co-op Group can finally begin integrating a regional society that told its members in April it could not survive alone.
If it does not, the case becomes the CMA’s most significant in-depth grocery merger investigation since Sainsbury’s and Asda in 2019, with an enforcement order that keeps two overlapping businesses apart deep into 2027. Given what both societies have said about the economics, that is the outcome neither of them can afford, and it is the reason the concession on Tuesday matters more than the finding itself.
Frequently asked questions
What did the CMA decide about the Co-op Group and Southern Co-op merger?
On September 15, 2026 the CMA found that the completed acquisition may be expected to result in a substantial lessening of competition in the UK. The concern is limited to local convenience grocery competition around 9 Co-op Group and 10 Southern Co-op stores, and to funeral services in one local area. No national concerns were identified.
Is the merger blocked?
No. The merger completed on July 26, 2026 and the CMA’s finding does not unwind it. The parties have until September 22, 2026 to offer undertakings in lieu, typically the sale of overlapping stores to an approved buyer. Only if no acceptable remedy is offered does the case go to a Phase 2 investigation.
Why did Co-op Group and Southern Co-op concede the competition concern?
According to the CMA’s decision summary, the parties formally conceded that the test for reference is met and asked for the case to be fast-tracked to the consideration of undertakings in lieu. Conceding a narrow local finding lets them move to remedies weeks sooner than contesting it, which matters because an initial enforcement order is preventing integration.
Which stores are affected?
The CMA’s summary refers to local areas centred on nine Co-op Group convenience stores and ten Southern Co-op convenience stores, plus one Co-op Group and one Southern Co-op funeral site, but does not name them. The full Phase 1 decision, which usually lists the affected areas, is expected to be published on the CMA case page after redactions.
What happens on September 22, 2026?
That is the last day for the parties to offer undertakings in lieu of a Phase 2 reference. If they offer a package, the CMA decides shortly afterwards whether it has reasonable grounds to believe the undertakings could be accepted, and then consults publicly before formal acceptance. If nothing is offered, the merger is referred for an in-depth Phase 2 investigation.
Will Southern Co-op stores close or change name?
Not as a result of this decision. Co-op Group said there are no changes for colleagues, members or customers at this stage, and Southern Co-op continues to trade under its own name inside a Co-op Group subsidiary. A divestment remedy would transfer specific stores to another retailer, which would then decide on branding.
How big is Southern Co-op?
According to its merger documentation, Southern Co-op operates 173 food stores, 77 Welcome franchise stores, 83 Starbucks coffeehouses, 69 funeral homes, three crematoria and four burial grounds, with about 330,000 members. It reported a 2024 loss of GBP 4.5 million on sales of GBP 543.9 million, roughly USD 733 million at current exchange rates.
What did the CMA clear in this decision?
The CMA found no realistic prospect of harm from input foreclosure in funeral services. It examined whether the merged group might restrict rival funeral directors’ access to Southern Co-op’s crematoria and concluded that the merged entity would not have the incentive to do so.
How long could a Phase 2 investigation take?
A Phase 2 investigation runs on a 24-week statutory timetable, extendable by up to eight weeks, and is conducted by an independent inquiry group. It would keep the initial enforcement order in force and delay integration into 2027, which is why both parties have an incentive to agree remedies at Phase 1.