A foreign technology group completes a US acquisition and receives a second request from the Department of Justice within weeks of closing. The deal had passed every internal compliance screen. Yet the enforcement division has opened a full investigation, the transaction is on hold, and legal exposure is mounting by the day. This scenario is far more common than international clients expect when entering US markets.
Competition law in the United States operates through a dual federal enforcement system administered by the Department of Justice Antitrust Division and the Federal Trade Commission. International businesses must satisfy merger notification requirements under federal premerger rules. Avoid conduct that constitutes price-fixing or monopolisation under federal antitrust legislation. Additionally, manage the risk of private litigation in US District Court alongside regulatory review. Enforcement timelines range from thirty days for an initial merger review to several years for contested monopolisation cases.
This page sets out the principal legal instruments available to international clients, the procedural steps and timelines involved. The most consequential pitfalls practitioners see in cross-border matters. Additionally, a self-assessment framework for businesses entering or operating in US markets.
The regulatory environment: how US antitrust law reaches international business
US competition law rests on two principal branches of federal antitrust legislation. The first addresses agreements and combinations that restrain trade. The second prohibits monopolisation and attempts to monopolise a market. Both branches apply to conduct that has a direct, substantial, and reasonably foreseeable effect on US commerce – regardless of where the parties are incorporated or where the conduct occurs.
That extraterritorial reach is the starting point for every cross-border analysis. A cartel formed between European or Latin American competitors can attract US enforcement if the cartel affects the price or supply of goods sold into the United States. Courts applying federal antitrust legislation have consistently held that nationality or place of incorporation does not insulate a party from US jurisdiction when US commerce is affected.
The two primary enforcement agencies divide jurisdiction by industry sector and deal type. The Department of Justice handles criminal cartel prosecution and merger review in sectors including technology, financial services, and defence. The Federal Trade Commission focuses on consumer protection-adjacent conduct, pharmaceutical mergers, and markets where deceptive practices intersect with anti-competitive behaviour. Both agencies can bring civil actions; only the DOJ prosecutes criminal price-fixing. State attorneys general add a further layer through parallel state antitrust statutes.
Private plaintiffs represent the most financially significant enforcement risk. Under federal antitrust legislation, a successful private claimant is entitled to treble damages – three times the actual damages proven – plus attorneys' fees. This private enforcement mechanism distinguishes the US system sharply from most EU, Brazilian, and other civil law systems. The practical consequence is that even conduct that regulators do not prioritise can generate catastrophic litigation exposure if a competitor, customer, or supplier brings a private action in a US District Court.
Market dominance is not itself unlawful under US antitrust legislation. The prohibition targets the wilful acquisition or maintenance of monopoly power through exclusionary conduct, rather than dominance achieved through superior products, innovation, or historic market development. This distinction matters enormously for international technology clients who enter the US market with already-strong positions in their home regions.
Key legal instruments and procedural timelines
Four instruments dominate the practice: merger notification and review, cartel investigation and leniency, monopolisation and abuse of dominance proceedings, and private antitrust litigation.
Merger notification. Transactions exceeding size-of-transaction and size-of-person thresholds under federal premerger notification rules must be filed with both the DOJ and FTC before closing. The filing triggers an initial waiting period, typically thirty calendar days. If either agency issues a second request – a demand for extensive additional documents and data – the waiting period extends until the parties have substantially complied and an additional thirty-day review period has elapsed. Second requests routinely take four to twelve months to resolve. International clients forming a Delaware LLC or acquiring a US entity must assess notification obligations early; closing without notification where required is a civil violation carrying daily financial penalties.
The parties bear the cost of assembling second-request productions, which can run into the hundreds of thousands of dollars for large document sets. Beyond direct cost, management distraction during a prolonged review is a significant indirect loss. Practitioners consistently note that deal teams underestimate how resource-intensive a contested second request becomes.
Cartel investigation and the leniency programme. The DOJ Corporate Leniency Programme offers complete immunity from criminal prosecution to the first company to report a cartel and cooperate fully. Subsequent cooperating parties can receive reduced penalties but not immunity. This creates a race dynamic: the first to approach the DOJ secures the most favourable position. Immunity is unavailable once the DOJ has opened its own investigation, which means the leniency programme's value is time-sensitive.
Parallel leniency applications in the EU and Brazil are often necessary when a cartel operates across multiple jurisdictions. The timing of applications across systems requires careful coordination. A disclosure made in one jurisdiction can affect privilege and confidentiality positions in another. For businesses operating between the US, EU, and Brazil, this multi-system coordination is the central strategic challenge in any cartel matter. Our analysis of competition law in Brazil addresses the specific leniency and administrative sanction regime that runs in parallel with US proceedings for businesses active in both markets.
Monopolisation proceedings. DOJ and FTC investigations into alleged monopolisation typically begin with civil investigative demands – broad information-gathering tools that compel document production and testimony. These investigations unfold over months or years before any formal enforcement action. The investigation stage is where the legal strategy is won or lost. Presenting a robust procompetitive justification for the challenged conduct, supported by economic evidence, can lead to closure without litigation. Failure to engage constructively at the investigative stage often means contested litigation before a US District Court, with the associated costs and public exposure.
Private antitrust litigation. Any person injured by conduct that violates federal antitrust legislation can sue in a US District Court. Class actions are the dominant vehicle for private cartel damages claims. A class certified against a defendant effectively aggregates thousands of individual claims into a single proceeding. The treble-damages multiplier and attorney fee-shifting mean that even modest per-unit overcharges can produce aggregate liability in the hundreds of millions of dollars. Settlement is the statistical norm, but the leverage created by class certification heavily influences settlement terms.
JAMS and AAA arbitration clauses in commercial contracts do not displace antitrust claims, which are treated as non-arbitrable statutory rights in many circuit courts. International clients who assume that AAA arbitration clauses in US supply agreements will channel competition disputes away from federal court may find that assumption incorrect.
To receive an expert assessment of your competition law exposure in the United States, contact us at info@ferrazwhitmore.com.
Practical insights and common pitfalls for international clients
International businesses entering the US market consistently encounter a cluster of misapprehensions about how US competition law operates. Understanding these gaps early avoids costly corrections later.
The resale price maintenance trap. Many international manufacturers set minimum resale prices in their home markets as a straightforward brand protection measure. In the US, minimum resale price maintenance. an agreement between a manufacturer and a distributor on the minimum price at which the distributor may resell. is assessed under a rule-of-reason analysis rather than per se condemnation. Following the Supreme Court's development of the relevant doctrine. However, this does not mean the practice is safe. A rule-of-reason challenge can still succeed if the plaintiff demonstrates anticompetitive effects. And several US states maintain per se prohibitions under their own competition legislation. International clients who import their pricing practices without US-specific legal review face meaningful exposure.
Information exchange risks in trade associations. Trade association meetings are a standard feature of most industries. In the US, the exchange of competitively sensitive information – pricing, output volumes, customer allocation – between competitors, even informally at a trade association event, can form the evidentiary foundation of a cartel claim. The competition authority does not require a formal written agreement. A series of emails and meeting notes showing that competitors knew each other's pricing intentions can suffice. International executives accustomed to looser information-sharing norms in other markets frequently underestimate this risk.
Gun-jumping in mergers. Federal premerger rules prohibit parties from implementing a transaction before the waiting period expires. Gun-jumping – coordination between the buyer and seller during the pre-closing period that goes beyond legitimate pre-closing cooperation – is a separate civil violation. Clients who begin integrating operations, exchanging competitively sensitive customer data, or aligning pricing before the regulatory clock has run face penalties independent of whether the underlying deal is ultimately approved.
Merger remedies and behavioural commitments. When the DOJ or FTC identifies competition concerns in a merger. The agencies may seek structural remedies. typically divestitures of overlapping businesses. or, less frequently, behavioural remedies such as firewalls or access commitments. International clients sometimes assume that offering a behavioural remedy will resolve concerns. In practice, the DOJ has expressed a strong preference for structural remedies in recent years. Entering negotiations with a structural offer already prepared, rather than leading with behavioural commitments, positions the parties more credibly before the reviewing agency.
For international clients managing related litigation risks. Our team's experience in corporate disputes in the United States covers the intersection between antitrust exposure and shareholder or contractual litigation that frequently arises in the same transaction or investigation context.
The SEC overlap. In sectors regulated by the SEC, antitrust conduct can attract parallel scrutiny from securities regulators. Market allocation arrangements between financial intermediaries, or information-sharing between asset managers, may simultaneously violate federal antitrust legislation and securities legislation. International fund managers and financial institutions entering US markets through a Delaware LLC structure must map both regulatory regimes before establishing operations.
Cross-border and strategic considerations
US competition investigations increasingly intersect with proceedings in the EU and Brazil. The same cartel or merger may be under review by the DOJ, the European Commission, and Brazil's competition authority simultaneously. Each system operates on different timelines, uses different evidentiary standards, and offers different leniency conditions.
The EU and US have a formal cooperation agreement that allows the two competition authorities to share information and coordinate investigative activity in cartel matters. This cooperation is not symmetric: protections for leniency applicants under EU rules do not automatically translate into protections before US authorities. Businesses that apply for leniency in the EU must carefully assess whether voluntary disclosures in Brussels create exposure in Washington, particularly for criminal cartel prosecution where the DOJ may access evidence independently.
Brazil's competition authority conducts its own merger review for transactions that meet Brazilian thresholds, in parallel with US review. A merger between parties with operations in both markets requires a coordinated filing strategy. The timing mismatch between Brazilian and US review periods is a common source of delay. Experienced counsel manage the two tracks to achieve the earliest possible global closing date. Our detailed examination of the Brazilian dimension is available through our page on competition law in Brazil.
For businesses considering alternative dispute resolution mechanisms in competition-adjacent commercial disputes, it is worth noting that JAMS and AAA arbitration remain useful for contract and commercial claims that do not raise core antitrust issues. Where the claim is purely contractual – a distributor claiming breach of a supply agreement – arbitration under JAMS or AAA rules can provide a faster and more confidential resolution than federal court litigation. The decision of whether to include an arbitration clause must account for the possibility that antitrust claims may arise from the same commercial relationship.
Transaction structuring also has a competition dimension. A Delaware LLC acquisition structured as an asset purchase rather than a share purchase may alter the analysis of what assets and revenues are counted toward notification thresholds. These structuring decisions require competition counsel to be involved at the letter-of-intent stage, not after the purchase agreement is drafted.
For a tailored strategy on competition law compliance and risk management in the United States, reach out to info@ferrazwhitmore.com.
Self-assessment checklist before taking action
US competition law engagement is appropriate when one or more of the following conditions applies to your business situation:
- Your business is acquiring a US entity or assets and the transaction value or party revenues may exceed federal premerger notification thresholds.
- You or your industry peers have shared pricing, output, or customer information in a context where US competitors or US commerce was affected.
- Your business holds a leading position in a US product or service market and is considering exclusivity arrangements, bundling practices, or loyalty rebates.
- You have received a civil investigative demand, second request, or informal inquiry from the DOJ or FTC.
- A former distributor, competitor, or customer has threatened or filed a private antitrust claim in a US District Court.
Before initiating any procedure, verify the following:
- Have you identified whether the conduct at issue is assessed under a per se rule or a rule-of-reason standard under current federal antitrust legislation?
- If a merger is involved, have you mapped all jurisdictions – including Brazil and the EU – where parallel notification obligations may apply?
- Have you assessed whether a leniency application in one jurisdiction will affect your position before competition authorities in other jurisdictions?
- Has competition counsel reviewed all trade association participation policies and information-sharing protocols?
- Have you confirmed whether any arbitration clauses in commercial agreements are likely to be treated as non-arbitrable in the relevant circuit?
If the investigation or transaction has already advanced beyond the preliminary stage. a second request has been issued, a criminal grand jury subpoena has arrived, or class certification has been briefed – the strategy shifts. At that point, the primary tasks are controlling document production, preparing economic expert evidence, and evaluating settlement versus trial economics. These are materially different exercises from pre-transaction planning, and they require immediate specialist engagement.
Frequently asked questions
- How long does a US merger review take, and what triggers the longest delays?
- An initial review runs for thirty calendar days after filing. The vast majority of transactions are cleared in this period without further process. When the reviewing agency issues a second request, the timeline extends substantially – typically four to twelve months depending on the complexity of the market and the volume of documents requested. The most common cause of delay is an inadequate initial filing that prompts early agency concern, followed by narrow market definition issues that the agency believes require deeper analysis.
- Does operating through a Delaware LLC insulate a foreign company from US antitrust liability?
- No. Corporate form and place of incorporation do not limit antitrust liability. Federal antitrust legislation applies to conduct that affects US commerce, regardless of whether the defendant is a Delaware LLC, a foreign-incorporated entity, or an individual. A foreign parent can be held liable for the US antitrust conduct of its subsidiaries, and assets or revenues of the broader corporate group may be counted for notification threshold purposes.
- Can a business use a lawyer experienced in both US and Brazilian competition law to manage parallel investigations?
- Engaging a lawyer in the United States with cross-border experience in both systems is strongly advisable when a cartel or merger involves both jurisdictions. The leniency regimes operate differently, the evidentiary standards diverge, and the timing of applications must be coordinated to avoid inadvertently prejudicing a party's position in one system through disclosures made in the other. A law firm with experience across both US and Brazilian competition proceedings can manage the sequencing and information barriers required to protect the client's position in each forum simultaneously.
About Ferraz & Whitmore
Ferraz & Whitmore is an international law firm based in Lisbon, advising business clients across 46 jurisdictions on competition law, corporate disputes, M&A, and cross-border regulatory matters. As a law firm in the United States context, our team brings together English common law expertise and civil law tradition to support international clients facing antitrust investigations. Merger review. Additionally, private litigation before US federal courts. Our competition law practice covers the full range of US enforcement scenarios – from pre-transaction notification analysis and DOJ leniency applications to private class action defence and cross-border coordination with Brazilian and EU proceedings. We work with international entrepreneurs, multinational corporations, and in-house legal teams who need results-oriented counsel across multiple legal systems. The firm's attorneys have advised on competition and merger matters spanning civil law and common law systems across three continents. Ferraz & Whitmore participates in cross-border practice groups focused on competition and antitrust regulation, and our Lisbon base provides direct access to EU regulatory frameworks alongside our common law enforcement capabilities. To discuss your competition law 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.