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The Hart–Scott–Rodino Antitrust Improvements Act of 1976 (Public Law 94-435, known commonly as the HSR Act) is a set of amendments to the antitrust laws of the United States, principally the Clayton Antitrust Act. The HSR Act was signed into law by president Gerald R. Ford on September 30, 1976. The context in which the HSR Act is usually cited is 15 U.S.C. § 18a, title II of the original law. The HSR Act is named after senators Philip A. Hart and Hugh D. Scott, Jr. and representative Peter W. Rodino.
The HSR Act provides that parties must not complete certain mergers, acquisitions or transfers of securities or assets, including grants of executive compensation, until they have made a detailed filing with the U.S. Federal Trade Commission and Department of Justice and waited for those agencies to determine that the transaction will not adversely affect U.S. commerce under the antitrust laws. While parties can carry out due diligence and plan for post-merger integration, they may not take any steps to integrate operations, such as an acquiring party obtaining operational control of the acquired party.
The Act provides that before certain mergers, tender offers or other acquisition transactions (including certain grants of executive compensation) can be completed, both parties must file a "notification and report form" with the Federal Trade Commission and the Assistant Attorney General in charge of the Antitrust Division of the Department of Justice. The parties then must wait a certain period, usually 30 days (15 days for all-cash tender offers or bankruptcy sales) during which time those regulatory agencies may request further information in order to help them assess whether the proposed transaction violates the antitrust laws of the United States or could cause an anti-competitive effect in the parties' markets. The filing is not made public, but the agencies may disclose some information about the transaction, especially in the case of publicly announced transactions.