What Does a Cfius Attorney Do in Corporate Transactions?

Mandatory filing applies when a foreign person acquires voting control or critical infrastructure assets regardless of control percentage. The Foreign Investment Risk Review Modernization Act of 2018 expanded mandatory coverage to include foreign persons acquiring certain real property near military installations, broadband network operators, and other sensitive assets. A foreign person includes foreign governments, state-owned enterprises, and any entity in which a foreign national holds a controlling interest. Corporate counsel must assess not only the direct acquirer but also the ultimate beneficial ownership chain to determine whether a foreign person sits at the top.

Mitigation agreements, negotiated between the foreign investor and CFIUS staff, allow parties to modify transaction structure or impose operational safeguards to resolve national security concerns. Common mitigation measures include board observer rights for U.S. .overnment representatives, restrictions on hiring foreign nationals in sensitive roles, technology transfer controls, and limits on access to proprietary data or facilities. When well-crafted, a mitigation agreement can transform a transaction CFIUS would otherwise block or delay into one that clears within the standard review timeline. Counsel must work closely with CFIUS staff to understand the specific national security issues the Committee perceives and to propose practical, enforceable remedies that address those concerns without destroying transaction economics.

CFIUS decisions are subject to limited judicial review; courts generally defer to the President's national security determinations under the International Emergency Economic Powers Act. Parties challenging a CFIUS block or demanding clearance have narrow grounds for relief. A federal district court in New York or another venue may hear a challenge to a presidential order blocking a transaction, but the court applies highly deferential scrutiny to national security judgments, making successful challenge exceptionally rare. Conversely, CFIUS has no statutory authority to unwind a transaction after closing if the parties fail to file or misrepresent material facts; instead, enforcement typically proceeds through civil or criminal penalties, forced divestiture orders, or national security investigations. Corporate counsel must treat CFIUS compliance as a gate that must be cleared before closing, not a post-closing remedial step.

Strategic filing decisions include timing, voluntary versus mandatory notification, scope of mitigation proposals, and coordination with other regulatory agencies. Early consultation with CFIUS staff through informal outreach can signal the investor's good faith and sometimes yield guidance on whether formal filing is necessary or whether voluntary notification would accelerate certainty. Parties must also assess whether the transaction implicates export control, foreign direct product rules, or other regimes that intersect with CFIUS jurisdiction. When a transaction involves sensitive technology or critical infrastructure, counsel should consider whether to file voluntarily even if CFIUS jurisdiction is marginal, because a post-closing CFIUS investigation or enforcement action carries far greater risk and cost than pre-closing review. Coordination with compliance counsel on sanctions, export controls, and related national security statutes ensures that CFIUS mitigation does not inadvertently create conflicts with other regulatory obligations.

Counsel should document the rationale for any CFIUS filing decision, preserve privilege over legal advice and strategic deliberations, and establish clear timelines for CFIUS clearance as a closing condition. If CFIUS review extends beyond the preliminary 30-day window, parties must evaluate whether to pursue mitigation negotiation, withdraw and refile with modified structure, or proceed to investigation and risk a block. Counsel should also consider whether to engage a CFIUS consultant or former government official to strengthen mitigation proposals and to communicate with CFIUS staff on behalf of the investor. Finally, transaction documentation should specify who bears the risk and cost of CFIUS delay or block, and whether either party has termination rights if clearance is not obtained within a specified window. Recording these decisions and the supporting analysis in contemporaneous memoranda creates a documentary record that can support a good-faith compliance defense if CFIUS later challenges the transaction or investigation surfaces discrepancies.

Corporate counsel navigating foreign investment transactions must recognize that CFIUS review is not a formality but a substantive national security gate. Early engagement with CFIUS guidance, thorough due diligence on the foreign investor, comprehensive disclosure, and strategic mitigation planning can mean the difference between deal certainty and deal failure. Counsel should also remain alert to overlaps with other sensitive legal regimes, such as defamation attorney matters involving reputational risk to the investor, or extortion attorney concerns if third parties attempt to leverage CFIUS concerns for improper advantage. Preparing transaction documentation, conducting sanctions and beneficial ownership screening, and documenting CFIUS strategy before signing the purchase agreement ensures that parties enter the review process with maximum leverage and minimal exposure to enforcement or deal collapse.