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National Security and Investment Act 2021

Guidance and information about the National Security and Investment Act.

The National Security and Investment Act (NSI) came into force on 4 January 2022.

The Act gives the government powers to scrutinise and intervene in business transactions, such as takeovers, to protect national security, while providing businesses and investors with the certainty and transparency they need to do business in the UK.

This page provides links to guidance on the rules and the accompanying legislation.

Contact the Investment Security Unit (ISU) for general enquiries or advice about the Act at investment.screening@beis.gov.uk.

Guidance on the rules about acquisitions that could harm the UK's national security

  • NSI Act guidance overview: this guidance sets out what types of acquisitions are covered, when you need to tell the government about an acquisition, and how the government will scrutinise the acquisition
  • Guidance on notifiable acquisitions in the 17 mandatory areas: If an entity you are acquiring performs a certain activity, it could put you in scope of the National Security and Investment Act and you may be legally required to tell the government about it (known as a ‘mandatory notification’). This guidance tells you what these activities are.
  • How to submit a notification form: assists parties when completing a notification form and explains the information parties might need to include when completing the form. This is accompanied by a privacy notice explaining how the ISU processes personal data and how it applies data protection principles.
  • This flowchart is to help you decide whether you need to notify the government about an acquisition
  • Market guidance notes: we will publish regular updates to the market on various aspects of NSI

Statement on the use of the call-in power

The Section 3 Statement sets out how the Secretary of State can exercise the power to give a call-in notice, as set out in section 3 of the NSI Act.

Submitting a notification about an acquisition

We have provided guidance on the information you need to complete a notification form.

We have also published the forms here so you can collect all the information you need before submitting your answers via the NSI notification service.

Submit a notification about an acquisition via the NSI service

Legislation

Read the National Security and Investment Act 2021 on legislation.gov.uk.

Secondary legislation

Published 11 November 2020
Last updated 20 July 2022 + show all updates
  1. Added guidance for new build downstream gas and electricity assets.

  2. Added NSIA annual report 2022, and a Memorandum of understanding on the operation of the National Security and Investment Act 2021.

  3. Added National Security and Investment Act 2021: guidance on compliance and enforcement.

  4. The NSI notification service will be unavailable from 4:00pm Sunday 20 March to 9:00am Monday 21 March 2022, due to routine maintenance work. If you have any notifications in progress they will not be affected.

  5. The National Security and Investment notification service will not be available on Saturday 15 January 2022 between 8:00am and 9:00am while we undertake maintenance. If you have a notification in progress it won't be affected.

  6. The National Security and Investment (NSI) Act came into force on 4 January 2022. The new rules have now started and the National Security and Investment notification service is open.

  7. Added NSI notification service forms to provide details of the information that will be required when you submit a notification. The service goes live on 4 January 2022.

  8. First published.