Jurisdiction(s):
United Kingdom

UK National Security and Investment Act 2021: buyer due diligence—assessing mandatory notification, call-in risk, trigger events since 12 November 2020, prior outcomes and structuring

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Checklists

This Checklist sets out the matters a buyer’s legal due diligence ought to cover to evaluate the potential effect of the UK’s National Security and Investment Act 2021 (NSI Act) on the deal...

Preliminary considerations

The buyer’s legal due diligence should factor in the potential implications of the UK’s NSI Act on the transaction (see Practice Note: The National Security and Investment Act 2021). The principal NSI Act-related diligence points include:

confirming whether any undertaking within the target’s group conducts activities that fall within sectors of the economy requiring mandatory notification under the NSI Act
where the transaction does not meet the mandatory notification criteria, assessing whether there remains a meaningful risk of the transaction being called in for a national security review
checking whether any member of the target’s group has been involved in a trigger event since 12 November 2020, which could be examined and potentially acted upon under the government’s call-in power in the NSI Act

What is the NSI Act

The NSI Act took effect on 4 January 2022...

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Web page updated on 20/05/2026

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