OCS-Mitie acquisition: what the £3.1bn deal means for UK FM competition

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OCS announced its recommended acquisition of Mitie on 21 July. £3.1 billion for the equity, around £8.5 billion of combined revenue, completion expected in the first quarter of 2027 subject to shareholder, court and regulatory approval.

Those numbers came from the announcement, and by now everyone has them. They tell you the size of the combined business. They tell you nothing about which contracts move next, or who is placed to take them.

So we went back to the Baachu Rain database, took the latest snapshot to 4 July, traced every trading name across both groups and rebuilt the combined business from its individual contracts. Four findings matter to anyone buying or selling FM in the UK.

1. Fourteen names, not two

Between them the two groups trade as OCS, Atalian Servest, EMCOR UK, FES FM, Maxim FM, Accuro, Profile Security, Exclusive Services, City Group Security, Mitie, Interserve, Marlowe, JCA Engineering and Argus Fire. Fourteen names, twelve of which hold contracts we track.

Search a supplier register for “Mitie” and “OCS” and you find about three quarters of the real footprint. Contracts held under acquired brands can remain invisible.

For buyers that is a governance problem, since registers built around trading names will understate concentration. For providers it is account intelligence. Search your target accounts across the whole corporate family rather than the two headline names. A customer running Mitie in one region and EMCOR in another, or OCS on soft services and Atalian Servest through a framework, may be considerably more exposed than its own procurement records suggest, and may not have worked that out yet.

2. Broad rather than deep

Across both groups and the businesses they have bought we track 1,268 contracts, 844 on the Mitie side and 424 on the OCS side. Of the 534 not known to have expired, 263 carry a published end date. Those carry £2.66 billion of annual value, of which £633 million is estimated from sector benchmarks where no value has been disclosed.

Looking only at contracts worth more than £5 million a year with a published value and a published end date, there are 296 in our data. The proposed group holds 84. ISS, the next largest, holds 23.

That is 3.7 times ISS by contract count. By annual value it is 2.4 times, £1,863 million against £790 million.

The gap between those two figures is the most useful thing here. ISS holds fewer but larger contracts on average, £34.3 million against the proposed group’s £22.2 million. The proposed group’s advantage is breadth: a large portfolio of substantial rather than exceptionally large contracts. That creates more individual renewal points at which challengers can compete, even though no single loss would materially change the enlarged group’s scale.

3. Where the recorded position is strongest

Central government is the finding that carries weight. Seventy-five contracts is by some distance our best coverage.

Manufacturing and pharmaceutical estates read higher at 58 per cent, but across twelve contracts, so a single award moves it by eight points. Treat it as an account-level signal and check it for yourself rather than building a campaign on it.

Read across the table and what it says to a competitor is this. Central government is the largest concentration finding and the hardest market to enter, so a challenger needs credible scale, security clearance, mobilisation depth and supply chain reach before the argument is worth making. Healthcare carries enough concentration to justify a proper look at NHS and healthcare estates specifically. And in local government and housing, do not run a concentration argument, because the evidence does not support it and any competent procurement lead will know that.

4. What is coming up for renewal

Seventy-two contracts with a published value and a published end date expire within 24 months, carrying £705 million of annual value. Forty of those expire within twelve months, carrying £418 million.

Completion is expected in the first quarter of 2027, which places the integration directly across that window.

Not every expiry will become a new competition. Some contracts will be extended, varied or retained without a full re-procurement. The opportunity lies in identifying which customers have both a contractual decision point and a genuine reason to test the market.

Within that 72-contract renewal pool, 42 contracts sit below the £5 million line, carrying £61 million of annual value. The remaining 30 sit above it and carry £644 million. The smaller tier is individually modest but collectively meaningful, and it sits within reach of many regional, specialist and mid-sized FM providers.

5. What this means for providers

Two things in our data give a competitor something specific to act on, rather than the general observation that integrations create openings.

The 49 dual-supplier accounts are the place to start. Baachu Rain identifies 49 organisations that appear across both corporate families: central government departments, defence and nuclear operators, a national broadcaster, transport authorities, water utilities, NHS bodies and FTSE-listed companies. If the deal completes, those relationships sit under one owner. Several operate formal supplier concentration policies, which gives them an internal reason to look at their exposure. These are not cold prospects. They are accounts where the customer will have a question to answer, and a provider who arrives with the resilience and continuity argument already made is having a different conversation from one making a cold approach.

Half the renewal picture is not on the portals. Of the 1,268 contracts we track across the two groups, 580 are private sector. Find a Tender and Contracts Finder are built around public procurement and do not systematically capture privately awarded FM work. A competitor working only from those portals sees part of the picture and misses the rest, and the part they miss is where concentration reads highest in our data, manufacturing and office estates. That half has to come from trade reporting, customer announcements and direct account research.

One point of timing sits underneath both. Where a whole estate is out of reach, before publishing a tender notice, a contracting authority must consider whether the services could reasonably be supplied under more than one contract and whether those contracts could appropriately be awarded by reference to lots, with preliminary market engagement beforehand. The moment to shape a lot you can actually win is during that engagement, before the procurement strategy is fixed. By the time the notice appears, the lot structure is usually settled. Lotting is not automatically better procurement, and buyers know it: it can reduce dependency but it hands integration and interface risk back to the authority. That is the argument a credible challenger has to answer, not dodge.

6. What buyers should do now

Map every contract, framework and specialist package against the full corporate family rather than the two names in the headline. Most registers will understate the position, because they were built brand by brand as the work was let.

For central government this is no longer a single-contract question. The proposed group holds 35 of the 75 large central government contracts in our data, so departments and relevant Crown Representatives need to assess exposure across the portfolio rather than authority by authority.

Work out how many credible alternatives you actually have in your sector at your scale. On this evidence the answer differs sharply. A local authority still has a genuine field. A large manufacturing or central government estate may find it thinner than expected.

And read your change of control provisions. Whether consent or novation is required will depend on the contracting entity, the transaction structure and the drafting, but it is a contractual lever every existing customer should understand before completion.

7. The UK procurement dimension

This is where a UK deal differs from the same transaction anywhere else, and where the practical consequences land first. Four points matter.

Change of control and novation. Many public sector FM contracts contain change of control provisions. Depending on the drafting, a change in ultimate parent may require the contracting authority’s prior consent, may trigger a right to be consulted, or may give the authority a termination right. Contracts held by the acquired businesses may also need novating. Whether any of that bites depends on the contracting entity, the transaction structure and the wording of each agreement, but every authority holding a Mitie contract has a clause to read and a decision to take, and the enlarged group will spend a good part of 2027 seeking consents rather than winning work.

Strategic supplier status. The Cabinet Office designates a limited number of companies as strategic suppliers, each with a Crown Representative as the single point of contact with government and performance monitored through a memorandum of understanding. Mitie is currently designated. The combination would materially increase the central government FM exposure sitting behind one such relationship, and is likely to prompt government to reassess how the enlarged group is managed within the regime. Post-acquisition treatment is not automatic.

Corporate resolution planning. Standard central government call-off terms now include a corporate resolution planning schedule, the mechanism introduced after Carillion collapsed in 2018 and took a large volume of public contracts down with it. Nobody is suggesting that risk here. The point is structural: the more public contracts sit inside one entity, the more weight a single resolution plan is asked to carry, and concentration and resilience become the same conversation viewed from two ends.

The Procurement Act 2023 gives authorities room to respond. The Act went live on 24 February 2025. Through the competitive flexible procedure, dynamic markets and lotting, an authority worried about concentration has more room than the old regime allowed to divide a requirement into lots, shape smaller lots that credible challengers can realistically bid for, and run preliminary market engagement that builds up alternative capability before a tender notice appears. Whether authorities use those tools is a separate question. The mechanisms exist, and this transaction gives them a reason to.

Crown Commercial Service became the Government Commercial Agency on 1 April 2026. Historic awards continue under their existing CCS names and terms.

8. What happens next, and what we are watching

The likely response from buyers is not wholesale termination. Switching a large FM contract is expensive and disruptive, and few clients do it out of principle. The more probable pattern over 2027 and 2028 is increased lotting, selective re-tendering of the parts of an estate where alternatives genuinely exist, harder scrutiny of change of control provisions at renewal, and deliberate efforts to bring additional providers into competitions where the credible field has narrowed.

It is a slower shift than the headline implies, and it surfaces in contract data before it surfaces in revenue.

Consolidation at the top of this industry has not reached the whole market. For capable regional, specialist and mid-sized providers, the transaction may create a two-year opening while two major groups direct management attention towards integration.

That does not make the enlarged group vulnerable by default. It keeps the advantages of incumbency, customer knowledge, mobilisation capability and scale. The 72 contracts approaching renewal are not work waiting to be collected. They are where its ability to defend a portfolio meets the rest of the market’s ability to offer a credible alternative, and the winners will be the providers who have already worked out which of those contracts are genuinely contestable rather than the ones complaining about concentration.

If the transaction completes, the clearest immediate beneficiaries are Mitie’s shareholders. Everyone else is in a two-year contest that will be settled contract by contract, in public where the portals can see it and in private where they cannot.

The £3.1 billion deal is the corporate story. Who retains or wins across the £705 million renewal window is the FM market story.

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Three things will show whether this changes the market or simply consolidates a balance sheet. Whether the CMA examines specific sectors rather than treating FM as one national market, as it did with Mitie and Interserve. Whether the 2027 and 2028 re-tenders show authorities actually dividing requirements into lots rather than merely being entitled to. And whether the enlarged group holds its retention rate across the 72 contracts approaching renewal, which is the number that will tell you the integration is working long before an annual report does.

9. About this analysis

Figures come from the Baachu Rain database, snapshot to 4 July 2026, which tracks 12,656 UK FM contracts across thirteen sectors, public and private.

Contract counts and values measure who holds contracts we track. They are not market share and not revenue. We track contract holders, not everyone who tendered, so this says nothing about who could win the work next time.

Multi-supplier framework panels are excluded, because a company named on a panel alongside twenty others has not won that value. Annual value is calculated as total contract value divided by term. The large-contract and renewal figures use published values only. Where a value has not been published we estimate from sector benchmarks and say so; £633 million of the £2.66 billion total is estimated on that basis.

No FM database is complete, including ours. Our data leans toward awards that were announced, which may over-represent the most publicity-active suppliers, and that includes both parties to this transaction.

The transaction is proposed and subject to shareholder, court and regulatory approval. Until it completes, OCS and Mitie remain two suppliers and should be treated that way on any register.

Baskar Sundaram spent eleven years in commercial roles at Serco and founded Baachu, which operates Baachu Rain, a UK FM contract intelligence platform.

Read the follow-up: OCS-Mitie and the CMA: the 2020 competitor map redrawn