The UK Defence Deal-Screening Gate
What 1,324 notifications and nine interventions reveal about control risk
The United Kingdom’s National Security and Investment regime is usually described through its headline clearance rate, and the headline understates what the regime actually does. In the 2025–26 reporting year the government reviewed 1,220 notified acquisitions and took no further action in 95.6 per cent of them, while 54 were called in for detailed assessment. Yet of the 53 called-in acquisitions on which a decision was reached, 17 per cent ended in a final order; the government identified 42 potential offences of completing a notifiable acquisition without approval and imposed no penalty in any of them; and three of the nine final orders made in the year concerned acquisitions that had never been notified at all. The practical screening gate is not broad and indiscriminate. It is selective, legally structured and concentrated around a narrow set of control risks, and its most material consequences fall on parties who misjudge the filing obligation rather than on parties who are refused.
The report separates the aggregate statistics from the conditional ones, and both from the published record of what the government actually required. It sets out the institutional logic of the regime under the section 3 statement, distinguishing target risk, acquirer risk and control risk. It then reconstructs the legal architecture: mandatory and voluntary notification, retrospective validation, the non-notified perimeter, the statutory clocks and their extensions, the automatic voidness of unapproved notifiable acquisitions, and the interaction with merger control and export control. It maps the industrial pattern visible across the public final orders into three clusters — sovereign supply continuity, irreplaceable know-how, and access to data and systems — and tests the assumption that acquirer nationality predicts intervention against a record in which UK-linked acquirers feature in five of the nine orders. It closes with the implications for deal planning, valuation, integration and financing, and with the reform trajectory announced but not enacted at the cut-off date.