A European technology group signs a letter of intent to acquire a mid-sized US software company. The deal looks clean on paper. Eighteen months later, the transaction has stalled inside a Committee on Foreign Investment review, and a rival bidder has closed a competing deal. The lost acquisition cost the European group far more than the regulatory fees – it cost market position. Cross-border mergers involving United States targets or acquirers expose foreign parties to a layered regulatory system that operates on federal, state, and sector-specific levels simultaneously. Missing even one clearance path can void a closing or force a divestiture after the fact.
A cross-border merger involving a US company requires navigating federal antitrust review under US competition legislation. National security screening by the Committee on Foreign Investment in the United States (CFIUS), and. for publicly listed parties. disclosure obligations under US securities legislation. The primary legal instruments are the share purchase agreement (SPA) or merger agreement, antitrust filings, and CFIUS notifications, each carrying defined timelines and closing conditions. From signing to close, straightforward deals take four to six months; transactions requiring CFIUS clearance in sensitive sectors routinely extend to twelve to eighteen months.
This guide walks through each procedural stage in sequence: pre-deal structuring choices, the due diligence phase, antitrust and CFIUS filing mechanics. State-level requirements, key documentary obligations. Additionally, the decision framework foreign parties should apply when evaluating deal structure and risk.
Structuring the deal: entity choice and pre-signing considerations
The structural decision made before signing shapes every subsequent regulatory obligation. Foreign acquirers most frequently enter the US market through a Delaware LLC (limited liability company incorporated under Delaware state corporate legislation) or a Delaware corporation. Both vehicles can serve as acquisition vehicles, but they carry different governance rules, tax treatment, and – in some sectors – licensing implications.
A Delaware LLC offers contractual flexibility and pass-through taxation. A Delaware corporation is the preferred vehicle where the target operates in a regulated industry or where future capital-raising in US public markets is anticipated. Choosing the wrong vehicle does not typically invalidate a deal, but it can trigger additional consents from the target's regulators or lenders mid-process.
Before signing, foreign parties should resolve four structural questions.
- Will the acquirer hold shares directly or through a US holding vehicle?
- Does the target hold licences that are non-transferable on change of control?
- Does the transaction cross the filing thresholds under US antitrust legislation?
- Is the target involved in critical technology, critical infrastructure, or sensitive personal data – the three CFIUS triggers?
Practitioners in the United States consistently note that foreign buyers underestimate the complexity of licence transfer requirements. In regulated sectors – telecommunications, banking, defence, aviation. Additionally. Healthcare – the target's existing licences may lapse automatically on change of control unless the acquirer has obtained successor approvals from the relevant federal or state regulator before closing. Identifying these licences during due diligence (the pre-signing investigation of the target's legal, financial, and operational condition) is therefore a pre-condition for an executable signing timeline, not a post-signing administrative step.
For transactions involving publicly listed targets, US securities legislation imposes its own structural constraints. The SEC (Securities and Exchange Commission) requires registration or exemption filings for certain share issuances used as merger consideration. Proxy statement requirements add further lead time. Foreign private acquirers often misjudge how long SEC review cycles take – typically four to eight weeks per review round, with the possibility of multiple rounds.
The regulatory clearance sequence: antitrust, CFIUS, and sector approvals
Most cross-border mergers involving a US party require at least one federal regulatory clearance. Many require two or three running concurrently. The sequence below reflects the practical order in which these processes should be initiated.
Step 1 – Antitrust notification. If the transaction crosses the applicable size-of-transaction and size-of-person thresholds under US antitrust legislation. The parties must file a pre-merger notification with the Federal Trade Commission and the Department of Justice. This is a mandatory, suspensory filing – closing before expiry of the waiting period is prohibited. The initial waiting period is thirty calendar days. Early termination – historically granted for uncontested deals in unconcentrated markets – has become less predictable in recent years. Budget for the full thirty-day period as the base case. Where the agencies issue a Second Request (a demand for further information), the timeline extends significantly – commonly by three to six additional months.
Step 2 – CFIUS review. Foreign acquisitions that give a foreign person control over a US business, or that involve non-controlling but covered investments in businesses with CFIUS-sensitive characteristics, require engagement with CFIUS. Two filing paths exist. A mandatory declaration – a short-form filing of approximately five pages – is required for certain acquisitions in businesses that produce, design, test, manufacture, or develop critical technology. The mandatory declaration process runs on a thirty-day review clock. Where a mandatory declaration is not required, parties may file a voluntary full notice instead. Voluntary notices trigger an initial thirty-day review, followed – if CFIUS determines further review is warranted – by a forty-five-day investigation period, which can itself be extended by fifteen additional days in exceptional circumstances. Pre-filing engagement with CFIUS staff is strongly advisable before submitting a formal notice. This informal dialogue can take four to eight weeks and meaningfully de-risks the formal process.
Step 3 – Sector-specific approvals. Banking acquisitions require approval from the Federal Reserve, the Office of the Comptroller of the Currency, or state banking regulators, depending on the target's charter. Telecommunications transactions require FCC consent. Defence contractors trigger DCSA facility clearance considerations. Energy transactions may require FERC approval. Each of these processes runs on its own clock, independent of antitrust and CFIUS timelines. Effective deal management requires mapping all applicable sector approvals before signing and building realistic parallel-track timelines into the SPA's closing conditions.
The closing conditions section of the SPA must therefore list every required regulatory approval with specificity. A generic "all material regulatory approvals" formulation invites disputes over whether a particular consent is, in fact, material. Experienced counsel will enumerate each approval individually and assign responsibility for obtaining it to the appropriate party.
For a tailored strategy on cross-border regulatory clearance in the United States, reach out to info@ferrazwhitmore.com.
Documentary requirements and the SPA framework
The primary transaction document in a US cross-border merger is the SPA – the share purchase agreement governing the sale of the target's equity, or the merger agreement in a statutory merger structure. US SPAs are typically long-form documents. They are considerably more detailed than equivalent instruments in civil law jurisdictions. A foreign buyer accustomed to a twenty-page French or Portuguese protocole de cession will encounter a US SPA running to two hundred pages or more, including extensive schedules.
The most significant substantive provisions for foreign parties are the representations and warranties (contractual statements by the seller about the condition of the target) and the indemnification regime. US practice has developed a market for representations and warranties insurance, which transfers indemnification risk to an insurer. This mechanism is now effectively standard in mid-market and larger US transactions. Foreign buyers who decline to engage with it may find sellers unwilling to accept escrow-backed indemnification structures that are common in other jurisdictions.
The documentary checklist for a cross-border US merger closing typically includes the following categories.
- Executed merger agreement or SPA, with all schedules and exhibits
- Board and shareholder resolutions of both parties authorising the transaction
- Antitrust filing confirmation and expiry or termination of waiting period
- CFIUS clearance letter or safe harbour declaration, where applicable
- All sector-specific regulatory approvals obtained and in final form
Beyond the core documents, the closing checklist will include officer certificates, legal opinions, payoff letters for debt to be repaid at closing, and bring-down certificates confirming that representations remain accurate as of the closing date. Foreign parties frequently underestimate the volume of bring-down documentation. In a transaction with an extended pre-closing period. common where CFIUS review is involved. the seller's obligation to operate the business in the ordinary course. Additionally. To re-certify that no material adverse change has occurred, generates ongoing documentation obligations from signing through to closing.
Dispute resolution provisions in US cross-border SPAs often designate a specific arbitral body or court as the exclusive forum. JAMS (Judicial Arbitration and Mediation Services) and AAA arbitration (American Arbitration Association) are the two most widely used private arbitration providers for commercial disputes in the United States. Many parties also designate the US District Court for the relevant federal district – typically the Southern District of New York or the District of Delaware – as the exclusive judicial forum for non-arbitrable claims. Foreign parties should ensure that their chosen dispute resolution mechanism is enforceable in their home jurisdiction before accepting it in the SPA.
For the corporate law dimensions of structuring a US acquisition vehicle, see our corporate law services for the United States, which covers entity formation, governance, and compliance obligations in depth.
Common errors by foreign clients and how to avoid them
Foreign parties entering a US cross-border merger for the first time make a recognisable set of errors. Each one carries a cost – in time, money, or deal value.
Misjudging the CFIUS risk profile. Many foreign buyers, particularly those from jurisdictions with close US security relationships, assume their nationality provides immunity from CFIUS scrutiny. In practice, CFIUS applies a transaction-specific analysis based on the nature of the target's business, not solely the acquirer's domicile. Targets with government contracts, proximity to sensitive facilities, access to large volumes of US personal data, or involvement in critical technology supply chains carry CFIUS sensitivity regardless of the acquirer's country of origin. A non-filing decision should be the product of a reasoned legal analysis, not an assumption.
Underestimating the due diligence scope. US targets accumulate legal exposure across federal and state levels simultaneously. Employment litigation, environmental liability, intellectual property ownership chains, and data privacy compliance under state-level privacy legislation all require examination. Foreign buyers accustomed to more consolidated legal systems sometimes narrow the due diligence scope prematurely. The consequence is post-closing indemnification claims that erode transaction value significantly.
Accepting a Delaware LLC structure without analysing the tax consequences. A Delaware LLC is transparent for US tax purposes. For a European acquirer, its home jurisdiction may treat the same vehicle as an opaque entity. This mismatch – known as a hybrid mismatch – can produce unexpected tax results in the acquirer's home country. The cross-border tax analysis must be completed before entity selection is finalised.
Agreeing to a fixed long-stop date without CFIUS contingency. SPAs typically include a long-stop date – the date after which either party may terminate if closing has not occurred. Foreign buyers sometimes agree to long-stop dates of six to nine months without adequately accounting for the possibility of a full CFIUS investigation. Where CFIUS issues a Request for Information during the investigation period, the timeline can extend well beyond nine months. A long-stop date that expires before CFIUS clearance is obtained forces the buyer into a difficult renegotiation or a termination.
Failing to address foreign law closing conditions. A cross-border deal may require not only US regulatory approvals but also merger control filings or investment screening approvals in the acquirer's home jurisdiction. A European buyer may need approval from its home competition authority. A Brazilian acquirer will need to engage Brazilian antitrust legislation. Parties sometimes focus exclusively on US clearances and allow the home-country filing to fall off the critical path. Missing a mandatory home-country filing can expose the acquirer to fines and, in some jurisdictions, transaction invalidity.
Practitioners working on US inbound M&A consistently note that the cost of correcting structural errors identified after signing – rather than before – is disproportionately high. The SPA is already signed. Renegotiating deal terms to accommodate a newly discovered regulatory obstacle requires the seller's consent, which is rarely given without a price adjustment. Rigorous pre-signing structuring analysis is the single most effective cost-control measure available to foreign buyers.
Our M&A advisory for the United States covers the full transaction lifecycle, from pre-deal structuring through regulatory clearance and post-closing integration.
Decision framework and self-assessment checklist
Before committing to a cross-border merger involving a US target or acquirer, foreign parties should work through the following decision points. This checklist does not substitute for legal advice, but it identifies the threshold questions that determine which regulatory paths apply.
Antitrust filing obligation. A mandatory antitrust pre-merger notification applies if the transaction value exceeds the applicable threshold under US antitrust legislation and both parties meet the size-of-person tests. If these thresholds are not crossed, no mandatory antitrust filing is required – but a voluntary assessment of competitive effects is still advisable if the parties have overlapping business activities in the same US markets.
CFIUS mandatory filing. A mandatory CFIUS declaration is required if the target is a US business that produces, designs, tests, manufactures. Alternatively. Develops a critical technology. Additionally, the acquirer is a foreign person acquiring any voting interest, board seat. Alternatively, access to material non-public technical information. Outside the mandatory category, a voluntary full notice is strongly advisable where the target operates in sectors with historical CFIUS sensitivity. defence supply chain. Telecommunications infrastructure, semiconductors, large-scale data processing. Alternatively, proximity to US government facilities.
Sector licensing analysis. The transaction requires a licence-transfer analysis if the target holds any federal or state licence that is material to its operations. The analysis must determine whether the licence is assignable, requires prior regulator consent, or lapses on change of control. This step must be completed before signing, not after.
Dispute resolution forum. Where the SPA designates a federal court. typically a US District Court. as the exclusive forum. The foreign party must verify that judgments from that court are enforceable in its home jurisdiction under applicable civil procedure and recognition rules. Where the SPA designates AAA arbitration or JAMS, the foreign party should confirm that any resulting award will be recognisable under the New York Convention in its home jurisdiction.
Cross-border tax analysis. Before finalising the acquisition structure, the foreign buyer's tax counsel must analyse the treatment of the chosen US entity type – including any Delaware LLC – under the buyer's home-country tax legislation. Hybrid mismatch rules, controlled foreign corporation regimes, and withholding tax obligations on dividends and interest must all be addressed.
This approach is applicable if the following conditions are met. The acquirer is a non-US entity or individual. The target is incorporated or primarily operating in the United States. The transaction results in a change of control or a covered investment as defined under US investment legislation. At least one of the parties has revenues, assets, or market presence that crosses the applicable antitrust filing thresholds.
For a preliminary review of your cross-border merger situation in the United States, email info@ferrazwhitmore.com.
For parties considering a parallel transaction involving a Latin American component, our guide to cross-border mergers involving Brazil addresses the distinct regulatory requirements under Brazilian corporate and competition legislation.
Frequently asked questions
Q: How long does a cross-border merger involving a US company typically take to close?
A: A straightforward cross-border merger can close in four to six months from signing the share purchase agreement. Deals requiring CFIUS review or multi-jurisdictional antitrust clearance regularly extend to nine to eighteen months. Complex transactions in regulated industries can take longer still.
Q: Is CFIUS review mandatory for every foreign acquisition of a US company?
A: CFIUS review is not mandatory for every transaction. However, it is compulsory for acquisitions that give a foreign person control over a US business. Additionally. For certain non-controlling investments in businesses tied to critical technology, critical infrastructure, or sensitive personal data. Mandatory filing thresholds are defined under US investment legislation. Voluntary filing is advisable whenever national security concerns could plausibly arise, because CFIUS can initiate its own review even after closing.
Q: What is the most common misconception foreign buyers have about US merger law?
A: Many foreign buyers assume that structuring a deal through a Delaware LLC automatically simplifies regulatory obligations. In practice, federal antitrust law, CFIUS rules, and sector-specific licensing requirements apply regardless of the acquisition vehicle chosen. Engaging a lawyer in the United States with cross-border M&A experience early in the process is essential to avoid costly restructuring mid-transaction.
About Ferraz & Whitmore
Ferraz & Whitmore is an international law firm based in Lisbon, advising business clients across 46 jurisdictions. Our team combines Portuguese civil law expertise with English common law tradition to deliver cross-border legal solutions in M&A transactions, including inbound and outbound deals involving United States counterparties. We assist international entrepreneurs, institutional investors, and in-house legal teams with the full regulatory clearance sequence – from pre-signing structuring through antitrust and CFIUS filings to post-closing integration. As a law firm advising on United States cross-border matters, we bring experience before arbitral bodies including JAMS and AAA arbitration panels, as well as before courts in English-speaking jurisdictions. The firm's practice covers 15 practice areas across Europe, the Americas, Asia, and the Middle East, supported by a network of local counsel. To discuss your cross-border merger situation in the United States, contact us at info@ferrazwhitmore.com.
Disclaimer: This publication is provided for informational purposes only and does not constitute legal advice. The information herein should not be relied upon as a substitute for professional legal counsel tailored to your specific circumstances. Ferraz & Whitmore assumes no liability for actions taken or not taken based on the contents of this material. For advice regarding your particular situation, please contact info@ferrazwhitmore.com.