Another UK outsourcer heads private: Mitie's £3.1bn sale to OCS and the slow drain of the London mid-cap

Mitie Group, the London-listed outsourcing group that runs cleaning, security, engineering and energy contracts for the UK government and a long tail of FTSE 100 estates, has agreed to be taken over by privately owned rival OCS in a deal worth roughly £3.1bn. The Mitie board is recommending the offer to shareholders, who will be asked to vote on a transaction that, if approved, removes another mid-cap industrial name from public markets at a moment when London's primary listings are already thinner than they have been in a generation.

The transaction matters less for its price than for what it signals. A government contractor with deep Whitehall relationships and a national footprint is exiting public scrutiny at the very point when ministers are relying on the same firms to deliver on net-zero targets, defence estates work, and the slow rebuilding of public-service capacity. The buyer is itself owned by private equity. The seller is a publicly listed company whose investors have spent a decade getting comfortable with its governance, audit and disclosure regime. After completion, that regime falls away, and the public interest in Mitie's work will be policed almost entirely by contract clauses, not by the City.

The terms on the table

Mitie's directors have recommended a deal that values the group at about £3.1bn, a headline figure that frames the recommended offer price, the implied premium to the undisturbed share price and the expected completion window. The recommendation is conditional on shareholder approval and on the usual regulatory clearances. OCS, the acquirer, is owned by private equity: the buyer is a private-equity-backed competitor that already runs facilities services at a comparable scale. The Mitie board has accepted the offer on the basis that it offers shareholders a clean cash exit at a meaningful premium to where the stock traded in the run-up to the announcement. Existing Mitie shareholders will receive the headline price per share as set out in the scheme document; the precise per-share figure, the precise premium and the precise timetable are the elements that the formal offer document will fix.

The commercial logic is straightforward. Both groups operate in the same low-margin, labour-intensive end of the UK outsourcing market. They sell to the same buyers (Whitehall departments, NHS trusts, university estates, large corporates) and they compete on much the same contracts. A combined group can strip out duplicated back office, fold two similar estates into one, and present a single face to the government's procurement gatekeepers. Whether that consolidation produces better services, worse services or simply fatter margins for the parent is the question the regulator, the Cabinet Office and a handful of trade unions will try to answer over the next several months.

Why the City is reading this as a referendum

London's mid-cap market has spent most of 2025 and the first half of 2026 absorbing a steady drumbeat of take-private deals, secondary listings choosing New York, and small-cap issuers quietly delisting when the cost of going public stops paying for itself. Each transaction, taken alone, looks like an ordinary corporate event. Taken together, they describe a market that is losing its roster of mid-sized industrial and services companies at a pace that visibly erodes the index's industrial weight. Asset managers point to this as a structural problem: when the FTSE 250 is no longer the natural home for a UK outsourcer with £3.1bn of enterprise value, the City stops being a credible venue for the next generation of mid-cap issuers.

The other reason the City is watching closely is the buyer. OCS is owned by private equity, and the assumption embedded in the share-price reaction is that a private-equity owner will run Mitie for cash, cut where it can, and prepare the asset either for resale in three to five years or for a refinancing that lets the sponsor crystallise its return. The Mitie board's recommendation implicitly endorses that outcome as fair to shareholders. Whether it is also fair to UK taxpayers who will still be writing the contracts on the other side of the transaction is a question that falls outside the takeover code and inside the slow, opaque world of public procurement.

The government contractor question

Mitie is not a household name, but it is woven into the everyday operation of the British state. Its contracts cover cleaning, security, building maintenance, energy management and, increasingly, decarbonisation work on public estates. The group's importance is precisely that it is unglamorous and pervasive: when a court heating system fails, when a hospital corridor needs a security presence, when a ministry needs to retrofit a building to meet a net-zero milestone, the firm that turns up is often an outsourcer, and on a meaningful share of those contracts the outsourcer is Mitie.

Moving that contract base into a private-equity-owned parent changes the accountability chain. A listed company files annual reports, submits to shareholder votes on remuneration, and answers to a non-executive board whose members are publicly named. A privately owned subsidiary does not. The work itself does not change; the visibility does. Public-sector clients will still have the same contractual levers, and the same remedies for under-performance, but those levers have always been weaker than procurement theory suggests. The Cabinet Office, NHS England and the Ministry of Defence will, in practice, be dealing with a counterparty whose ultimate owner is a fund with a five-to-seven-year holding horizon.

Stakes and what to watch

The deal still has to clear three tests. First, the Mitie shareholder vote, which the recommendation makes likely but not certain if a dissident group of institutional investors argues the price undervalues a long-dated decarbonisation pipeline. Second, competition clearance in the UK facilities-management market, where OCS and Mitie already overlap and where the regulator will have to decide whether the combined share in any sub-segment triggers a deeper inquiry. Third, a softer but harder test: the public-procurement reaction. If the Cabinet Office signals discomfort, large departments can quietly reshape tender specifications to favour non-Mitie suppliers; that is not a legal block but it is a commercial one.

The longer stakes sit elsewhere. The transaction adds another name to a list of London-listed companies that have concluded the public market is not paying them to stay public. Each exit reduces the gravitational pull of the London exchange on UK and European mid-cap issuers who might otherwise have listed there. That is the real headline: not the £3.1bn, but the steady, transactional way the industrial mid-cap is migrating from public to private hands. The next data point to watch is the scheme document, which will pin down the precise price, premium and timetable, and set the clock running on shareholder approval.

The sources do not specify which private-equity sponsor backs OCS or the precise per-share terms of the recommended offer. The headline figure, the recommended-offer status and the identity of buyer and seller are the load-bearing facts. The rest will become clearer once the formal offer document is in the public domain.