Category: Antitrust and Competition

Hart-Scott-Rodino Act

Also known as: HSR Act, Hart-Scott-Rodino Antitrust Improvements Act of 1976, Hart-Scott-Rodino Antitrust Improvements Act

Simply put

The Hart-Scott-Rodino Act is a U.S. federal law, enacted in 1976, that requires companies planning certain mergers or acquisitions to notify the government before completing the deal. This gives the Federal Trade Commission and the Department of Justice information and time to review whether the transaction may harm competition. It applies only in the United States and is a specific legal requirement, not a general ethics standard.

Formal definition

The Hart-Scott-Rodino Antitrust Improvements Act of 1976 amended U.S. antitrust law, principally the Clayton Act, by adding Section 7A (15 U.S.C. 18a) to establish the federal premerger notification program. Under the Act, parties to qualifying transactions must file premerger notifications with the Federal Trade Commission and the Antitrust Division of the Department of Justice and observe a statutory waiting period before closing, enabling the agencies to assess potential competitive effects. The Act imposes binding, jurisdiction-specific obligations enforced through civil penalties for violations; applicable filing thresholds and penalty amounts are periodically revised and should be confirmed against current primary sources. This entry addresses the premerger notification framework and does not cover the substantive antitrust liability standards under the Clayton or Sherman Acts, which fall outside its scope. This glossary entry is educational and not a substitute for advice from qualified antitrust counsel.

Why it matters

For companies pursuing mergers or acquisitions, the Hart-Scott-Rodino Act converts antitrust review from a reactive process into a mandatory pre-closing gate. Because qualifying transactions cannot lawfully close until the parties file premerger notifications with the Federal Trade Commission and the Department of Justice Antitrust Division and observe a statutory waiting period, the Act directly shapes deal timelines, closing conditions, and negotiation strategy. Failing to file when required, or closing before the waiting period expires, exposes parties to civil penalties assessed on a per-day basis, making HSR compliance a matter of legal obligation rather than discretionary judgment.

The HSR Act sits squarely on the compliance side of the compliance-ethics spectrum: it is a binding U.S. federal legal requirement with defined consequences, not a values-based standard that a company may choose to exceed. For compliance and legal teams, this distinction matters because HSR obligations are triggered by objective transaction criteria and enforced through statutory penalties. Companies with active corporate development, joint venture, or acquisition activity need clear internal processes to identify reportable transactions early, because the analysis of whether a deal crosses applicable thresholds must happen before signing and closing rather than after.

The specific filing thresholds and the maximum civil penalty for violations are periodically revised, so exact figures should be confirmed against current FTC primary sources before relying on them. The broader point for program design is that HSR is one component of a company's antitrust compliance posture, addressing premerger notification procedure only; it does not resolve the substantive question of whether a transaction unlawfully harms competition, which is governed by other antitrust statutes and requires separate analysis and qualified counsel.

Who it's relevant to

Legal and antitrust counsel

In-house and outside legal teams bear primary responsibility for determining whether a transaction is reportable under the HSR Act, preparing premerger notification filings, and managing the statutory waiting period. Because reportability depends on transaction-specific facts and thresholds that change over time, this analysis requires qualified antitrust counsel rather than reliance on general guidance.

Corporate development and M&A teams

Professionals who source, structure, and negotiate mergers and acquisitions need to build HSR analysis into deal timelines early. Because qualifying transactions cannot close until filings are made and the waiting period runs, HSR requirements affect signing-to-closing schedules, closing conditions, and the sequencing of integration activities.

Compliance officers and ethics program managers

Those maintaining antitrust compliance programs should ensure the organization has processes to flag potentially reportable transactions before they close and to route them to legal review. HSR is one specific procedural component of antitrust compliance and does not by itself address the substantive question of whether a deal harms competition.

Learning and development and training staff

Staff designing antitrust compliance training for corporate development, finance, and legal personnel can use HSR to illustrate a mandatory, U.S.-specific pre-closing obligation with defined penalties. Training on HSR should emphasize early identification of reportable deals and escalation to counsel, and should distinguish HSR's notification procedure from broader substantive antitrust standards.

Inside HSR Act

Premerger Notification Requirement

The Hart-Scott-Rodino (HSR) Act is a U.S. federal law that requires parties to certain mergers, acquisitions, and other transactions to notify the Federal Trade Commission (FTC) and the Department of Justice (DOJ) Antitrust Division before closing. It is jurisdiction-specific to the United States and does not govern transactions solely subject to other countries' merger control regimes. Exact filing thresholds are adjusted periodically and should be confirmed against primary FTC sources rather than assumed.

Reporting Thresholds

HSR notification obligations are generally triggered when a transaction meets specified size-of-transaction and, in some cases, size-of-person tests. These thresholds are set by statute and updated over time; practitioners should verify the current figures directly with the FTC because exact dollar amounts change and are not reliably stated from memory.

Waiting Period

The Act imposes a mandatory waiting period after filing during which the parties generally may not complete the transaction, allowing the antitrust agencies to review the deal for potential competitive concerns. The agencies may request additional information (commonly referred to as a 'second request'), which can extend the review timeline.

Enforcement Agencies

Review authority is shared between the FTC and the DOJ Antitrust Division. These agencies assess whether a proposed transaction may substantially lessen competition, a substantive antitrust question that is separate from the procedural notification and waiting-period mechanics HSR establishes.

Compliance Nature

HSR sits firmly on the compliance side of the compliance-ethics spectrum: it imposes binding legal obligations with defined procedures and potential consequences for failure to file or for closing prematurely. It is not a values-based ethics standard and not a voluntary or principles-based framework.

Scope and Boundaries

HSR concerns the procedural obligation to notify and observe a waiting period; it does not by itself determine whether a transaction is lawful under substantive antitrust law. Non-U.S. merger control regimes, general antitrust conduct rules, and internal ethics considerations fall outside the scope of the HSR notification requirement.

Common questions

Answers to the questions practitioners most commonly ask about HSR Act.

Is the Hart-Scott-Rodino Act a general ethics standard that guides corporate values?

No. The Hart-Scott-Rodino Antitrust Improvements Act is a U.S. compliance statute, not an ethics framework. It concerns adherence to a specific legal requirement, premerger notification and waiting periods for certain transactions, rather than values-based judgment or conduct exceeding legal minimums. Treating it as a broad ethics guide misstates both its purpose and its scope. Because it involves binding legal obligations, application to any specific transaction requires qualified legal counsel.

Does completing an HSR filing mean a merger has been approved by the government?

No. An HSR filing is a premerger notification that triggers a statutory waiting period during which reviewing agencies may evaluate the transaction; it is not an approval or a clearance. The filing is intended to give the relevant U.S. antitrust authorities the opportunity to review a deal before closing, not to certify that the deal is lawful or unproblematic. Whether and how a transaction proceeds depends on the review and any subsequent action, which should be assessed with qualified legal counsel.

How does HSR fit within a broader compliance program rather than as a standalone task?

HSR compliance is one specific regulatory obligation that typically sits within a larger corporate compliance system alongside components such as policies, risk assessment, training, and monitoring. A training module on HSR may support awareness among the deal, legal, and M&A teams, but it does not by itself satisfy an organization's compliance program. Organizations generally treat HSR as a discrete workflow requiring specialized legal review for each covered transaction, coordinated with broader antitrust compliance efforts.

Which teams should receive training or awareness materials related to HSR?

Awareness is generally most relevant to those involved in transactions and their oversight, such as corporate development, M&A, legal, finance, and senior leadership, because they identify when a deal may be reportable. Such training is intended to help these teams recognize potential filing situations early and escalate them to counsel; it is not a substitute for legal analysis of whether a specific transaction is reportable. The appropriate scope of training depends on the organization's transaction activity and structure.

What thresholds or figures determine whether a transaction is reportable under HSR?

HSR uses statutory size-of-transaction and size-of-person tests to determine reportability, and certain figures are adjusted periodically. This entry does not state specific current dollar thresholds, filing fees, or waiting-period lengths, because these values change and should be confirmed against primary sources and current agency guidance. Any determination of whether a transaction meets applicable thresholds should be made with qualified legal counsel.

How should an organization document and integrate HSR into its transaction workflow?

Organizations commonly build HSR assessment into their deal approval and diligence processes so that potential reportability is evaluated before closing, with documented escalation to legal counsel. Because HSR imposes binding legal obligations under U.S. law and involves defined procedural steps and timing, the specifics of documentation, filing responsibility, and waiting-period management should be established with qualified legal advisors. This glossary entry is educational and not a substitute for professional legal advice.

Common misconceptions

Filing an HSR notification means the government has approved or blessed the transaction.

An HSR filing satisfies a procedural notification obligation and starts a waiting period; it does not constitute approval. The agencies may still investigate, issue a second request, or challenge the transaction on substantive antitrust grounds. Clearance of the waiting period is not the same as an affirmative endorsement.

HSR applies to all mergers and acquisitions anywhere a company operates.

HSR is a U.S. federal law and applies only to transactions meeting its statutory thresholds and criteria. Deals below the reporting thresholds may not require filing, and transactions in other jurisdictions are governed by those countries' own merger control laws, not HSR.

Meeting HSR requirements means the deal cannot raise antitrust problems.

HSR governs notification and timing, not the substantive legality of a transaction. A properly filed deal can still be challenged if the agencies conclude it may substantially lessen competition. Compliance with HSR procedure and compliance with substantive antitrust law are distinct.

Best practices

Confirm the current size-of-transaction and size-of-person thresholds directly with primary FTC sources for each transaction, since these figures are updated periodically and should never be assumed from memory.

Engage qualified antitrust counsel early in transaction planning to assess whether an HSR filing is required and to distinguish procedural notification obligations from substantive antitrust risk.

Build the mandatory waiting period, and the possibility of a second request extending it, into deal timelines so that parties do not inadvertently close before the period expires.

Treat HSR compliance as a distinct legal obligation within a broader deal-review process, and do not assume a completed filing signifies government approval of the transaction.

Document filing decisions and the analysis supporting whether thresholds were met, so the organization can demonstrate a good-faith, defensible compliance process.

Coordinate U.S. HSR obligations with any applicable non-U.S. merger control requirements, recognizing that HSR does not satisfy filing obligations in other jurisdictions.