National Security and Investment Act 2021

Cabinet Office Investment Security Unit · 2026-07-14 · UK · verified record

Themes: Cross-sector · Investment security

Ecosystems: UK NSI Act

National Security and Investment Act 2021 Guidance and information about the National Security and Investment Act. The NSI notification service will be unavailable on Saturday 22 August 2026 while essential maintenance takes place. We apologise for any inconvenience caused. The government has now published its response to the consultation on the NSI Act Notifiable Acquisition Regulations (NARs). This consultation response summarises the feedback received and sets out the changes that the government will take forward for each schedule of the NARs. The National Security and Investment Act (NSI)

National Security and Investment Act 2021 Guidance and information about the National Security and Investment Act. The NSI notification service will be unavailable on Saturday 22 August 2026 while essential maintenance takes place. We apologise for any inconvenience caused. The government has now published its response to the consultation on the NSI Act Notifiable Acquisition Regulations (NARs). This consultation response summarises the feedback received and sets out the changes that the government will take forward for each schedule of the NARs. The National Security and Investment Act (NSI) came into force on 4 January 2022. The NSI 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. 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. In exercising its statutory functions under the National Security and Investment Act 2021, the Investment Security Unit within the Cabinet Office may observe, monitor, record, retain and share within government internet data which is available to anyone. This is known as ‘open source’ material and includes: - News reports - Internet sites - Public records such as Companies House and Land Registry - Blogs and social networking sites where no privacy settings have been applied The Cabinet Office may also use third party service providers, including aggregators of open-source information, to obtain information. Submit a notification about an acquisition via the NSI service Once accepted, all notifications are reviewed within 30 days, in line with statutory requirements.…

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