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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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2026

4 events
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…
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…

2024

12 events
10 Sep 2024 | Policy paper Cabinet Office ISU linked direct

National Security and Investment Act 2021: Annual Report 2022-23

Why linked: Matched expansion phrase: National Security and Investment Act 2021

Annual report on the implementation of the National Security and Investment Act 2021 covering 2022-23

▤ View document · ↗ GOV.UK · ↓ National Security and Investment Act 2021: annu… (57pp)
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↓ National Security and Investment Act 2021: annual report 20… ↓ Supplementary background information
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
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…
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↓ 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…
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…
+2 more
↓ 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
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…

2023

4 events
7 Jul 2023 | Statutory Instrument ISU linked direct

The Secretaries of State for Energy Security and Net Zero, for Science, Innovation and Technology, for Business and Trade, and for Culture, Media and Sport and the Transfer of Functions (National Security and Investment Act 2021 etc) Order 2023

Why linked: Alternative legislation.gov.uk listing of the same May 2023 Transfer of Functions Order.

This Order in Council is made under sections 1 and 2 of the Ministers of the Crown Act 1975. It makes provision in connection with the establishment of the Department for Energy Security and Net Zero, the Department for Science, …

▤ View document · ↗ GOV.UK
7 Jul 2023 | Statutory Instrument ISU linked direct

The Secretaries of State for Energy Security and Net Zero, for Science, Innovation and Technology, for Business and Trade, and for Culture, Media and Sport and the Transfer of Functions (National Security and Investment Act 2021 etc) Order 2023

Why linked: Transfer of Functions Order 2023 making NSI Act functions concurrently exercisable by the Chancellor of the Duchy of Lancaster — the machinery change that moved the regime to the Cabinet Office.

This Order in Council is made under sections 1 and 2 of the Ministers of the Crown Act 1975. It makes provision in connection with the establishment of the Department for Energy Security and Net Zero, the Department for Science, …

▤ View document · ↗ GOV.UK

2022

2 events
29 Mar 2022 | Statutory Instrument ISU linked direct

The National Security and Investment Act 2021 (Prescribed Form and Content of Notices and Validation Applications) (Amendment) Regulations 2022

Why linked: Corrective amendment regulations made March 2022 following JCSI scrutiny of drafting defects in the Prescribed Form regulations.

These Regulations correct errors identified by the Joint Committee on Statutory Instruments in its 22nd Report of 2021-2022 by amending the National Security and Investment Act 2021 (Prescribed Form and Content of Notices and Validations Applications) Regulations 2021. In Schedules …

▤ View document · ↗ GOV.UK

2021

25 events
20 Dec 2021 | Statutory Instrument ISU linked direct

The National Security and Investment Act 2021 (Commencement No. 2 and Transitional and Saving Provision) Regulations 2021

Why linked: NSI Act 2021 Commencement No. 2 Regulations 2021 — brought the substantive regime into force on 4 January 2022 with transitional savings.

These Regulations are the second commencement regulations made under the National Security and Investment Act 2021 (c. 25) (“the 2021 Act”) and commence the remaining provisions of the Act and make transitional and saving provision.

▤ View document · ↗ GOV.UK
16 Nov 2021 | Statutory Instrument ISU linked direct

The National Security and Investment Act 2021 (Monetary Penalties) (Turnover of a Business) Regulations 2021

Why linked: NSI Act 2021 (Monetary Penalties) (Turnover of a Business) Regulations 2021 — defines turnover calculation for the penalty regime.

These Regulations make provision for the purposes of section 41 of the National Security and Investment Act 2021 (c. 25) (“the Act”), for determining when a business is to be treated as controlled by a business and for determining the …

▤ View document · ↗ GOV.UK
16 Nov 2021 | Statutory Instrument ISU linked direct

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

Why linked: Legislation.gov.uk page for the NSI Act 2021 (Notifiable Acquisition) Regulations 2021 — the central operationalising SI.

Under section 6(2) of the National Security and Investments Act 2021 (“the Act”), a notifiable acquisition takes place when a person gains control of a qualifying entity of a specified description, by virtue of one or more of the cases …

▤ View document · ↗ GOV.UK
16 Nov 2021 | Statutory Instrument ISU linked direct

The National Security and Investment Act 2021 (Prescribed Form and Content of Notices and Validation Applications) Regulations 2021

Why linked: NSI Act 2021 (Prescribed Form and Content of Notices and Validation Applications) Regulations 2021 — a core operationalising SI of the regime.

The National Security and Investment Act 2021 (“the Act”) provides for persons to notify the Secretary of State about acquisitions that constitute trigger events and to apply for retrospective validation of a notifiable acquisition. These Regulations set out the information …

▤ View document · ↗ GOV.UK
15 Nov 2021 | Statutory Instrument ISU linked direct

The National Security and Investment Act 2021 (Procedure for Service) Regulations 2021

Why linked: NSI Act 2021 (Procedure for Service) Regulations 2021 — operationalising SI governing how notices and orders are served under the regime.

These Regulations specify the procedure for serving (or giving) documents which are required or allowed to be given under the National Security and Investment Act 2021 (“the Act”).

▤ View document · ↗ GOV.UK
11 Nov 2021 | Statutory Instrument Cabinet Office Department for Business, Energy & Industrial Strategy Department for Energy Security and Net Zero evidence

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

Why linked: Filled the "Guidance on qualifying entities and notifiable acquisitions thresholds" gap via web research

The statutory instrument (SI 2021/1264) that legally specifies, across 17 schedules, the descriptions of qualifying entities and the UK activities they must carry on to fall within mandatory notification requirements under section 6(2) of the NSI Act. It is the …

▤ 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)
+2 more
↓ Draft statement on the use of the power to call in acquisit… (9pp) ↓ National Security and Investment: statement for the purpose… (14pp)
1 Nov 2021 | Bill stage ISU linked

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

Considered in Grand Committee 16:12:00 Moved by Lord Callanan: That the Grand Committee do consider the National Security and Investment Act 2021 (Notifiable Acquisition) (Specification of Qualifying Entities) Regulations 2021. Relevant document: 13th Report from the Secondary Legislation Scrutiny Committee …

▤ View Bill · ↗ Parliament
2 Jul 2021 | Statutory Instrument ISU linked direct

The National Security and Investment Act 2021 (Commencement No. 1 and Transitional Provision) Regulations 2021

Why linked: NSI Act 2021 Commencement No. 1 Regulations 2021 — commenced the powers needed to make the operationalising SIs ahead of the substantive regime.

These Regulations bring into force certain provisions of the National Security and Investment Act 2021 (c.25) (“the Act”) and make transitional provision.

▤ View document · ↗ GOV.UK
28 Apr 2021 | Bill stage ISU linked

National Security and Investment Bill

Commons Reason 13:32:00 Motion A Moved by Lord Callanan: That this House do not insist on its Amendments 11 and 15, to which the Commons have disagreed for their Reason 11A. 11A : Because it is appropriate and sufficient for …

▤ View Bill · ↗ Parliament
28 Apr 2021 | Bill stage ISU linked

National Security and Investment Bill

Consideration of Lords message Clause 61 Annual report 16:44:00 The Parliamentary Under-Secretary of State for Business, Energy and Industrial Strategy (Paul Scully): I beg to move, That this House disagrees with Lords amendments 11B and 11C. The amendments made in …

▤ View Bill · ↗ Parliament
28 Apr 2021 | Bill stage ISU linked

National Security and Investment Bill

Commons Reason 21:26:00 Motion A Moved by Lord Callanan: That this House do not insist on its Amendments 11B and 11C, to which the Commons have disagreed for their Reason 11D. 11D: Because it is appropriate and sufficient for oversight …

▤ View Bill · ↗ Parliament
26 Apr 2021 | Bill stage ISU linked

National Security and Investment Bill

Consideration of Lords amendments Clause 4 Consultation and parliamentary procedure 22:44:00 The Parliamentary Under-Secretary of State for Business, Energy and Industrial Strategy (Paul Scully): I beg to move, That this House agrees with Lords amendment 1. Madam Deputy Speaker (Dame …

▤ View Bill · ↗ Parliament
22 Apr 2021 | Bill stage ISU linked

National Security and Investment Bill

Third Reading 13:30:00 Motion Moved by Lord Callanan: That the Bill do now pass. The Parliamentary Under-Secretary of State, Department for Business, Energy and Industrial Strategy (Lord Callanan) (Con): My Lords, I start by expressing my gratitude to noble Lords …

▤ View Bill · ↗ Parliament
15 Apr 2021 | Bill stage ISU linked

National Security and Investment Bill

Report 13:31:00 Clause 3: Statement about exercise of call-in power Amendment 1 Moved by 1: Clause 3, page 3, line 9, at end insert— “( ) details of the circumstances in which the application to an asset of any export …

▤ View Bill · ↗ Parliament
16 Mar 2021 | Bill stage ISU linked

National Security and Investment Bill

Committee (3rd Day) 14:04:00 Clause 11: Exceptions relating to control of assets Amendment 38 not moved. Amendment 39 Moved by 39: Clause 11, page 7, line 36, at end insert— “(aa) prescribe circumstances which are not to be regarded as …

▤ View Bill · ↗ Parliament
9 Mar 2021 | Bill stage ISU linked

National Security and Investment Bill

Committee (2nd Day) 14:31:00 The Deputy Chairman of Committees (Baroness Healy of Primrose Hill) (Lab): My Lords, the hybrid Grand Committee will now begin. Some Members are here in person, respecting social distancing, others are participating remotely, but all Members …

▤ View Bill · ↗ Parliament
2 Mar 2021 | Bill stage ISU linked

National Security and Investment Bill

Committee (1st Day) 14:31:00 The Deputy Chairman of Committees (Baroness Healy of Primrose Hill) (Lab): My Lords, the hybrid Grand Committee will now begin. Some Members are here in person, respecting social distancing, others are participating remotely, but all Members …

▤ View Bill · ↗ Parliament
4 Feb 2021 | Bill stage ISU linked

National Security and Investment Bill

Second Reading 14:13:00 Moved by Lord Callanan: That the Bill be now read a second time. The Parliamentary Under-Secretary of State, Department for Business, Energy and Industrial Strategy (Lord Callanan) (Con): My Lords, this Bill represents a major upgrade to …

▤ View Bill · ↗ Parliament
20 Jan 2021 | Bill stage ISU linked

National Security and Investment Bill

[ Relevant d ocument : Oral evidence taken before the Defence Sub-Committee on 14 December 2020 on Foreign Involvement in the Defence Supply Chain, HC 699 .] Consideration of Bill, not amended in the Public Bill Committee New Clause 1 …

▤ View Bill · ↗ Parliament

2020

1 event
17 Nov 2020 | Bill stage ISU linked

National Security and Investment Bill

Second Reading. 13:52:00 The Secretary of State for Business, Energy and Industrial Strategy (Alok Sharma): I beg to move, That the Bill be now read a Second time. Our country has always been a beacon for inward investment and a …

▤ View Bill · ↗ Parliament