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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.

This flowchart is to help you decide whether you need to notify the government about an acquisition.

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

Legislation

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

Secondary legislation

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

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

The privacy notice explains how we will treat any personal data you submit in connection with the NSI Act, and the terms and conditions relate to usage of the notification service.

Published 11 November 2020
Last updated 16 June 2022 + show all updates
  1. Added NSIA annual report 2022, and a Memorandum of understanding on the operation of the National Security and Investment Act 2021.

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

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. First published.