Nippon Steel / U.S. Steel: CFIUS Veto and Lessons for Cross-Border M&A

In December 2023, Japan's Nippon Steel Corporation announced a definitive agreement to acquire Pittsburgh-based U.S. Steel Corporation for approximately $14.9 billion — a 40% premium to U.S. Steel's pre-announcement share price. The transaction was structured as a cash merger at $55.00 per share and represented one of the largest cross-border steel industry acquisitions in history.

Nippon Steel, the world's fourth-largest steelmaker, positioned the deal as a strategic investment to modernize U.S. Steel's aging blast furnace infrastructure, preserve American jobs, and strengthen the U.S.-Japan alliance in critical manufacturing. U.S. Steel's board unanimously approved the transaction.

By January 2025, President Biden had blocked the deal — a rare and consequential exercise of presidential authority under the CFIUS framework.

The Committee on Foreign Investment in the United States (CFIUS) is an interagency body chaired by the Secretary of the Treasury. It reviews foreign acquisitions of U.S. businesses for national security implications under the authority of the Defense Production Act of 1950, as amended by the Foreign Investment Risk Review Modernization Act of 2018 (FIRRMA).

CFIUS has jurisdiction over:

• Acquisitions of control over a U.S. business by a foreign person
• Certain non-controlling investments in U.S. businesses involved in critical technology, critical infrastructure, or sensitive personal data (TID U.S. businesses)
• Real estate transactions near military installations

Under FIRRMA, certain transactions require mandatory CFIUS filing:

• Foreign government-controlled investors acquiring any interest in TID U.S. businesses
• Foreign investors acquiring a "substantial interest" in TID U.S. businesses

The Nippon Steel / U.S. Steel transaction was subject to voluntary filing — Nippon Steel was not government-controlled, and U.S. Steel, while critical to domestic manufacturing, did not fall squarely within the mandatory filing categories. However, given the deal's size and political sensitivity, the parties filed voluntarily in March 2024.

The referral to the President — rather than CFIUS reaching its own determination — was itself significant. It reflected deep political divisions within the committee and the extraordinary political pressure surrounding the deal.

The Biden administration's blocking order cited three primary national security concerns:

1. Domestic steel production capacity: U.S. Steel operates blast furnaces that produce steel for defense applications, including naval vessels and military vehicles. CFIUS expressed concern that foreign ownership could compromise the reliability of this supply chain.

2. Critical infrastructure vulnerability: Steel production facilities are classified as critical infrastructure. CFIUS has broad authority to impose conditions or block transactions involving critical infrastructure, even where the acquirer is a close ally.

3. Supply chain resilience: The administration invoked broader concerns about maintaining domestic industrial capacity — particularly in light of lessons from COVID-19 supply chain disruptions and ongoing geopolitical tensions.

The national security rationale, while legally sufficient, was widely viewed as secondary to political considerations:

• United Steelworkers (USW) opposition: The union, which represents approximately 11,000 U.S. Steel workers, vigorously opposed the deal, arguing it threatened jobs and collective bargaining agreements. USW's political influence in Pennsylvania — a critical swing state — was substantial.
• Presidential election year: The deal was reviewed during a presidential election year, with both major party candidates competing for union support in Pennsylvania.
• Bipartisan opposition: Senators from both parties, including those from steel-producing states, publicly opposed the transaction.

Nippon Steel and U.S. Steel argued — credibly — that the blocking order was driven by politics rather than genuine national security concerns. Nippon Steel had offered extensive mitigation measures, including commitments to maintain U.S. production levels, preserve union agreements, and accept CFIUS monitoring.

Following the blocking order, Nippon Steel and U.S. Steel filed suit in the U.S. Court of Appeals for the D.C. Circuit, challenging the President's order as arbitrary and capricious. The litigation raised important questions about the scope of presidential authority under CFIUS and the adequacy of the process afforded to the parties.

As of early 2025, the litigation remained pending — a rare instance of a foreign acquirer directly challenging a presidential CFIUS determination in federal court.

Under 50 U.S.C. § 4565(d), the President may:

• Suspend a proposed transaction pending CFIUS review
• Prohibit a transaction that threatens national security and cannot be mitigated
• Divest a completed transaction (requiring the foreign acquirer to unwind the deal)

Presidential action is rare. In most cases, CFIUS resolves transactions through negotiated mitigation agreements — legally binding commitments by the acquirer to address specific security concerns. Common mitigation measures include:

• National security agreements (NSAs) with ongoing monitoring
• Proxy board arrangements for sensitive subsidiaries
• Supply chain commitments
• Personnel security requirements

Before filing, acquirers must determine whether their transaction is a "covered transaction" subject to CFIUS jurisdiction. Key questions include:

1. Is the acquirer a "foreign person"? This includes foreign nationals, foreign entities, and entities in which foreign persons hold a 25%+ interest.
2. Is the target a "U.S. business"? Broadly defined to include any entity engaged in interstate commerce.
3. Does the transaction result in "control"? Control is broadly defined and includes the ability to determine, direct, or decide important matters affecting a U.S. business.
4. Is the target a TID U.S. business? If so, even non-controlling investments may be subject to CFIUS review.

CFIUS scrutiny varies significantly by sector. The highest-risk sectors include:

• Defense and defense supply chain
• Semiconductors and advanced technology
• Telecommunications and 5G infrastructure
• Energy (including steel for energy infrastructure)
• Ports and transportation infrastructure
• Sensitive personal data businesses

Turkish acquirers face a nuanced CFIUS environment. Turkey is a NATO ally, which generally reduces — but does not eliminate — national security concerns. However, several factors can heighten CFIUS scrutiny of Turkish transactions:

1. Turkish government ownership or influence: Transactions involving Turkish state-owned enterprises (SOEs) or entities with significant government ties receive heightened scrutiny. CFIUS applies a "foreign government control" analysis that looks beyond formal ownership to actual influence.

2. Dual-use technology: Turkish companies acquiring U.S. businesses with export-controlled technology (ITAR, EAR) face additional review layers, including coordination with the Departments of State and Commerce.

3. Sector overlap: Turkish conglomerates with interests in steel, energy, construction, and telecommunications — sectors that overlap with U.S. critical infrastructure — should anticipate CFIUS review.

4. Third-country connections: Turkish entities with significant business relationships in Russia, China, or Iran may face heightened scrutiny regardless of the transaction's direct national security implications.

For Turkish acquirers contemplating U.S. targets, a proactive CFIUS strategy is essential:

1. Early CFIUS counsel engagement Engage experienced CFIUS counsel before signing a letter of intent. CFIUS analysis should inform deal structure, pricing, and timeline.

2. Jurisdictional analysis Determine whether the transaction is a covered transaction and, if so, whether mandatory or voluntary filing is appropriate. Voluntary filing provides certainty and avoids the risk of CFIUS initiating a review post-closing.

3. Mitigation planning Identify potential national security concerns early and develop a mitigation package. Proactive mitigation proposals — offered before CFIUS raises concerns — are viewed more favorably than reactive responses.

4. Political intelligence Assess the political environment surrounding the target. Transactions involving unionized workforces, defense contractors, or politically sensitive industries require political as well as legal analysis.

5. Deal structure considerations Consider whether a minority investment, joint venture, or licensing arrangement could achieve commercial objectives while reducing CFIUS exposure. Non-controlling investments in non-TID businesses generally receive less scrutiny.

6. Timeline planning Build CFIUS review time into deal timelines. A full CFIUS review — initial review plus investigation — can take up to 90 days. Presidential referrals add additional time. Deals in sensitive sectors should plan for 6–12 months from signing to closing.

The Nippon Steel / U.S. Steel transaction offers several lessons that extend well beyond the steel industry:

1. Allied status is not a shield Japan is among America's closest allies. The blocking of a Japanese acquisition of a U.S. company demonstrates that CFIUS national security concerns can override alliance relationships when domestic political and industrial policy considerations are sufficiently strong.

2. Mitigation offers may not be enough Nippon Steel offered extensive mitigation measures — arguably more comprehensive than those accepted in comparable transactions. The blocking order suggests that in politically charged deals, mitigation may be insufficient regardless of its substantive adequacy.

3. Labor relations are a CFIUS factor The USW's opposition was central to the political dynamics that drove the blocking order. Foreign acquirers of unionized U.S. businesses should engage with labor stakeholders early and develop a credible labor relations strategy.

4. Presidential authority is broad and reviewable only at the margins The D.C. Circuit litigation will test the limits of judicial review of presidential CFIUS determinations. Historically, courts have been highly deferential to presidential national security judgments. The outcome will have significant implications for future cross-border M&A.

5. Political risk is a deal risk Cross-border M&A in the United States is not purely a legal and financial exercise. Political risk — including the risk that a legally approvable transaction is blocked for political reasons — must be assessed and priced into deal economics.

The Nippon Steel / U.S. Steel transaction is a landmark case study in the intersection of national security review, industrial policy, and electoral politics. For Turkish acquirers pursuing U.S. targets, it underscores the importance of early CFIUS analysis, proactive mitigation planning, and realistic assessment of political risk.

ULF New York advises Turkish and international clients on CFIUS strategy, cross-border M&A structuring, and U.S. regulatory compliance. Contact us to discuss how CFIUS considerations apply to your specific transaction.

This article is for informational purposes only and does not constitute legal advice. For advice specific to your transaction, please consult qualified legal counsel.