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National Security and Investment Act Regulations

The Cabinet Office, Department for Business, Energy & Industrial Strategy, and Department for Energy Security and Net Zero are implementing and updating regulations under the National Security and Investment Act 2021 to control acquisitions of qualifying entities that pose national security risks. The regulatory framework specifies which entities trigger mandatory notification requirements, with ongoing consultation with industry stakeholders on notifiable acquisition thresholds and definitions.

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26 Mar 2026 | Guidance Cabinet Office ISU linked direct

Operation of the National Security and Investment Act 2021: memorandum of understanding between the Cabinet Office and the CMA

Why linked: MoU between the Cabinet Office and the CMA on operation of the NSI Act — the principal inter-regulator coordination instrument.

Memorandum of Understanding between the Cabinet Office and the Competition and Markets Authority on the operation of the National Security and Investment Act 2021.

▤ View document · ↗ GOV.UK · ↓ MoU between Cabinet Office and the CMA on the o…
21 May 2024 | Guidance Cabinet Office ISU linked direct

National Security and Investment (NSI) Act: Market Guidance

Why linked: May 2024 NSI Market Guidance.

The topics in the Market Guidance are based on analysis of the notifications received under the NSI Act and feedback from stakeholders on their experience of the system.

▤ View document · ↗ GOV.UK · ↓ National Security and Investment: Market Guidan…
+2 more
↓ National Security and Investment: Market Guidance, April 20… ↓ National Security and Investment: Market Guidance (July 202…
21 May 2024 | Guidance Cabinet Office ISU linked direct

National security and investment: statement about exercise of the call-in power

Why linked: May 2024 refreshed section 3 statement on the use of the call-in power.

The section 3 statement sets out how the Secretary of State expects to exercise powers under the NSI Act to call-in certain acquisitions for scrutiny.

▤ View document · ↗ GOV.UK · ↓ Foreword to the statement for the purposes of s…
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↓ National Security and Investment Act 2021: Statement for th… ↓ National Security and Investment Act 2021: Statement for th…
6 Feb 2024 | Guidance Cabinet Office ISU linked direct

National Security and Investment Act 2021: guidance for new build downstream gas and electricity assets

Why linked: February 2024 NSI Act guidance on new-build downstream gas and electricity assets.

This guidance helps developers of new build downstream gas and electricity infrastructure to understand the scope of the National Security and Investment Act 2021.

▤ View document · ↗ GOV.UK · ↓ Applicability of the National Security and Inve…