OCS Group has agreed to acquire facilities management rival Mitie in a transaction valued at £3.1 billion.
The deal marks the latest high-profile exit from the London Stock Exchange, as foreign and private buyers continue to strip the UK's mid-cap index of listed constituents.
The acquisition underscores a broader trend of consolidation within the UK outsourcing sector.
Larger players are increasingly targeting smaller peers to achieve scale, while the London market faces persistent pressure from delistings.
This development adds to growing concerns among investors and policymakers about the depth and liquidity of the UK equity market.
Mitie, a long-standing FTSE 250 component, will be taken private following the completion of the transaction.