The NSI notification service will be unavailable for much of the day on Sunday 6th March 2025 while essential maintenance takes place.We apologise for any inconvenience caused.
You may need to tell the government about certain acquisitions before you can go through with them. You do this by completing and submitting a form through the National Security and Investment notification service - see link below.
Published 17 December 2021 Last updated 14 March 2025 +show all updates
Updated to include a message regarding maintenance taking place
Removed a message regarding now completed maintenance
Added a message regarding upcoming maintenance on the system
Replaced the following documents with their updated version:Mandatory notification form Voluntary notification form Retrospective validation form
Removed a message regarding now completed maintenance
Added a message regarding upcoming maintenance on the system
Replaced the following documents with updated versions:Mandatory notification formVoluntary notification formRetrospective validation form
Updated the section 'Supply relationships with the UK government' in the document 'Guidance on completing and registering a notification form'
Removed a message regarding now completed maintenance
Added a message regarding upcoming maintenance on the system
Removed a message regarding now completed maintenance on the system.
Added a message regarding upcoming maintenance on the system
Removed a message regarding maintenance
Added a message regarding maintenance
Removed a note regarding planned maintenance
Added a note regarding planned maintenance
Updated with the latest information
Removed a notice on maintenance work due to its completion.
Added a notice that the NSI notification service will be unavailable for much of the day on Saturday 17th of February 2024 while essential maintenance takes place.
Updated contact email address for investment screening
