When a foreign buyer wants to acquire an American company, the deal can be reviewed, reshaped, or blocked by a committee most people have never heard of. It is called CFIUS, the Committee on Foreign Investment in the United States, and if you work anywhere near cross-border transactions, it shapes deals long before it ever blocks one.
I spent part of my pre-law career helping a Hong Kong headquartered company establish its first North American office. Nobody in that world talks about CFIUS the way statutes describe it. They talk about it the way sailors talk about weather: something you plan around. Here is the plain English version of what it actually is.
What CFIUS is
CFIUS is an interagency committee of the federal government, chaired by the Treasury Department, with members from agencies like Defense, State, Commerce, Homeland Security, and Justice. Its job is narrow on paper: review certain foreign investments in US businesses for national security risk, and recommend action to the President if a risk cannot be resolved.
That is the whole mandate. CFIUS does not review deals for economic policy, job impact, or whether the price is fair. National security is the only lens. In practice, “national security” has proven to be a wide lens.
What kinds of deals it can review
Three broad categories matter.
First, control transactions. If a foreign person acquires control of a US business, CFIUS can review it. Control is defined functionally, not by percentage. A minority stake with board seats and veto rights can be control.
Second, certain non-controlling investments. A 2018 statute called FIRRMA expanded CFIUS jurisdiction to cover some minority investments in US businesses involved with critical technologies, critical infrastructure, or sensitive personal data. Lawyers shorthand these as TID businesses (technology, infrastructure, data).
Third, certain real estate transactions, mainly property near military installations, ports, and other sensitive facilities.
Who has to file
Here is the part that surprises people: most CFIUS filings are voluntary. Parties file because the alternative is worse. If you close a covered deal without filing, CFIUS can review it later, years later, with no time limit, and can order divestiture after the fact. Filing and getting clearance buys a safe harbor. Skipping the filing leaves the deal permanently exposed.
A smaller set of transactions carries mandatory filing requirements, mainly certain deals involving critical technologies or substantial foreign government ownership. Get those wrong and there are civil penalties.
What happens in a review
The process runs in stages. Parties can submit a short-form declaration or a full notice. CFIUS then assesses whether the deal presents a national security risk. Most transactions clear. Some clear with conditions, called mitigation agreements: things like security protocols, board restrictions, or fencing off certain data or facilities from the foreign investor.
A small number cannot be mitigated. For those, CFIUS refers the matter to the President, who has statutory authority to block the transaction or unwind it. Presidential blocks are rare. They are rare partly because deals that would be blocked usually die quietly first, restructured or abandoned once the parties see where the review is heading.
That is the practical lesson: CFIUS matters most in the deals it never formally touches. Transaction lawyers structure around it from day one. Who is the ultimate investor? What does the target actually touch? Is there a mandatory filing? Is the risk mitigable? Those questions get asked before a term sheet is signed, not after.
Why a law student writes about this
Because cross-border deal work is where business judgment and regulatory law meet, and that intersection is where I spent years before law school, on the business side, without the legal vocabulary. Learning that vocabulary is a large part of why I am here.
Further reading
- Setting Up in the US: Legal Basics for Foreign Companies
- Cross-Border M&A: What Changes, Plainly
- Business Law: all posts
I am a law student, not a lawyer. This post is general education, not legal advice. If you are contemplating a transaction with any foreign investment component, talk to counsel who does this work.
