Publications Memos Go Back HSR Report Form Change to NAICS Codes 05.09.01 This memorandum deals with an interim rule effective July 1, 2001 that implements changes to certain reporting requirements on the Premerger Notification and Report Form under the Hart-Scott-Rodino Act. Related Insights 02.13.25 | Publications Simpson Thacher Sustainability and ESG: Regulatory Update – February 2025 02.11.25 | Publications Significant Changes to Global FCPA Enforcement Are Likely 01.27.25 | Publications Welsh Carson, FTC Resolve Administrative Complaint While New Chairman Signals a Shift in Views Concerning Private Equity Antitrust Enforcement Related Services Related Practice Areas Litigation Antitrust and Trade Regulation Complex Commercial Litigation