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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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12 Mar 2026 | Consultation (open) Cabinet Office ISU linked direct

National Security and Investment Act (Notifiable Acquisition) (Specification of Qualifying Entities) Regulations 2021 (HTML)

Why linked: HTML version of the March 2026 consultation document on NSI Notifiable Acquisition Regulations.

HTML version of the March 2026 consultation document on NSI Notifiable Acquisition Regulations.

In response to: Consultation on the NSI Act Notifiable Acquisition Regulations

▤ View document · ↗ GOV.UK
12 Mar 2026 | Consultation outcome Cabinet Office ISU linked direct

Consultation on the NSI Act Notifiable Acquisition Regulations

Why linked: The 2025-2026 Citizen Space consultation on the NSI Notifiable Acquisition Regulations — the direct successor consultation to the original SI 2021/1264 design.

This consultation seeks views on proposed changes to the National Security and Investment Act (Notifiable Acquisition) (Specification of Qualifying Entities) Regulations 2021

▤ View document · ↗ GOV.UK · ↓ National Security and Investment Act (Notifiabl… (73pp)
+3 more
↓ National Security and Investment Act (Notifiable Acquisitio… ↓ National Security and Investment Act (Notifiable Acquisitio… (37pp) ↓ National Security and Investment Act (Notifiable Acquisitio…
27 Aug 2024 | Consultation outcome NESO linked direct

CMP390: Updating application forms to enable disclosure of information to government for purposes of the National Security and Investment (NSI) Act 2021

Why linked: August 2024 CMP390 consultation outcome on amending the energy code to enable disclosure for NSI Act purposes — operational implementation detail.

Source: National Energy System Operator code modification register Code: CUSC Modification status: Implemented - Pending Decision Last updated: 2024-08-27 The National Security and Investment (NSI) Act 2021 enables Government to scrutinise the acquisition of rights in entities and assets and …

▤ View document · ↗ GOV.UK · ↓ CMP390 Legal Text
+9 more
↓ CMP390 Proposal Form ↓ CMP390 Code Administrator Consultation and Annexes ↓ CMP390 Code Administrator Consultation Response Proforma ↓ CMP390 Code Administrator Consultation ↓ CMP390 Final Modification Report Annexes ↓ CMP390 Final Modification Report ↓ CMP390 Draft Final Modification Report Annexes ↓ CMP390 Draft Final Modification Report ↓ CMP390 Authority Decision
18 Apr 2024 | Consultation (closed) Cabinet Office ISU linked direct

Call for Evidence - National Security and Investment Act

Why linked: April 2024 Call for Evidence on the NSI Act — first-order review of the regime.

We want to hear your views on how the NSI regime can be even more business friendly while maintaining and honing the essential protections we need for our national security

▤ View document · ↗ GOV.UK · ↓ Call for Evidence - National Security and Inves…
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↓ Privacy Notice for National Security and Investment Act: C… ↓ National Security and Investment Act 2021: Call for Evidenc…
18 Apr 2024 | Consultation outcome Cabinet Office ISU linked direct

Government response to the Business and Trade Committee’s submission to the National Security and Investment Act Call for Evidence 2023

Why linked: Government response to the Business and Trade Committee's submission to the NSI Call for Evidence — direct committee scrutiny of the regime.

This is the Government’s response to the Business and Trade Committee’s submission to the NSI Call for Evidence.

▤ View document · ↗ GOV.UK
2 Nov 2021 | Consultation outcome Department for Business, Energy & Industrial Strategy ISU linked direct

National Security and Investment Act 2021: statement on the use of the power to call in acquisitions

Why linked: Original consultation on the Section 3 Statement on use of the NSI call-in power.

We're seeking views on the draft statement concerning the use of the call-in power under section 3 of the National Security and Investment Act 2021.

▤ View document · ↗ GOV.UK · ↓ National Security and Investment Act 2021: cons… (15pp)
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↓ Draft statement on the use of the power to call in acquisit… (9pp) ↓ National Security and Investment: statement for the purpose… (14pp)
1 Mar 2021 | Government response Cabinet Office Department for Business, Energy & Industrial Strategy Department for Energy Security and Net Zero evidence

National Security and Investment: Government Response to the Sectors in Scope of the Mandatory Regime Consultation (March 2021)

Why linked: Filled the "Consultation responses and impact assessments on regulatory scope" gap via web research

The foundational government response to the November 2020 consultation on which sectors and activities fall within the NSI Act's mandatory notification regime, covering all 17 sensitive areas of the economy and setting out revised draft sector definitions ahead of the …

▤ View document · ↗ GOV.UK