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The Federal Trade Commission requires that persons filing a Hart-Scott-Rodino (HSR) notification with respect to a proposed transaction use the North American Industry Classification System (NAICS) to report their revenues in Item 5 and certain overlap information in Items 7 and 8 of the Notification and Report Form for Certain Mergers and Acquisitions (HSR Form).

All persons must submit data on non-manufacturing revenues at the 6-digit NAICS industry code level. To the extent that dollar revenues are derived from manufacturing operations (NAICS Sectors 31-33), data must be submitted at the 10-digit product code level (NAICS-based codes).

As of August 18, 2011, filing persons must use the most recent NAICS reporting year in their response(s) to the HSR Form. 76 FR 42471 (July 19, 2011). 

See the HSR Form Instructions for additional guidance. 

Information concerning NAICS as well as the applicable 6-digit and 10-digit codes can be found here: