New to premerger notification?
Start by reading Introductory Guide I, What is the Premerger Notification Program? (PDF) and Introductory Guide II, To File or Not to File (PDF), for background about the program.
For help in determining whether to file, check out Steps for Determining Whether an HSR Filing is Required and the Aggregation Summary.
You can find more detailed information and form tips on the HSR Resources page. If you still have questions, contact the PNO staff at HSRHelp@ftc.gov.
Pursuant to Section 857 of the National Defense Authorization Act for Fiscal Year 2024, some filers may be required to submit a copy of their HSR premerger notification filing to the Department of War (DoW). Please see our page about DoW filings for more information.