The National Security Investment Act 2021 (the “Act”) came into effect on 4 January 2022 and introduced a new UK investment screening regime focused on national security risks (the “NSI Regime”). It is similar to the Committee on Foreign Investment in the United States (“CFIUS”) regime. The Act is wide reaching; it provides the UK government with the power to review and intervene in transactions that may pose a UK national security risk due to a transfer of control of sensitive entities or assets.