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 03.20.26 | Publications Update: Fifth Circuit Denies FTC’s Motion for Stay, Filers Return to Using Old HSR Form and Rules 01.20.26 | Publications Revised HSR Act Thresholds and Increased Filing Fees 01.05.26 | Publications New Treasury Guidance Clarifies Publicly Traded Securities Exception to Outbound Rule Related Services Related Practice Areas Litigation Antitrust and Trade Regulation Complex Commercial Litigation