ARTICLE
11 December 2025

The NSI Act

KM
Katten Muchin Rosenman LLP

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Katten is a firm of first choice for clients seeking sophisticated, high-value legal services globally. Our nationally and internationally recognized practices include corporate, financial markets and funds, insolvency and restructuring, intellectual property, litigation, real estate, structured finance and securitization, transactional tax planning, private credit and private wealth.
The article examines the UK's National Security and Investment Act 2021, which grants the government the authority to review and intervene in acquisitions of control over UK entities and assets...
United Kingdom Technology
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The article examines the UK's National Security and Investment Act 2021, which grants the government the authority to review and intervene in acquisitions of control over UK entities and assets — regardless of deal value or investor nationality — particularly in sensitive sectors such as artificial intelligence (AI), defense, energy and data infrastructure. It outlines mandatory and voluntary notification triggers, review timelines, potential civil/criminal penalties (including void transactions and fines up to the higher of £10 million or 5 percent of global turnover), and the government's call-in, information-gathering and remedial powers. It emphasizes practical steps for accountants and deal teams, including integrating NSI screening into early due diligence, planning for timing, considering voluntary filings and maintaining accurate records.

"The NSI Act," International Accountant – The Professional Journal of the Association of International Accountants, November/December 2025

The content of this article is intended to provide a general guide to the subject matter. Specialist advice should be sought about your specific circumstances.

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