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.
- Then review Frequently Asked Questions for help with basic inquiries about the HSR filing requirements.
- For help in determining whether to file, check out Steps for Determining Whether an HSR Filing is Required and the Aggregation Summary.
- When you are ready to fill out an HSR Form, refer to the HSR Style Sheet, the Form Tip Sheet (PDF), the NAICS Overview, and the new Checklist for Filing.
You can find more detailed information and form tips on the HSR Resources page. If you still have questions, contact the PNO staff at (202) 326-3100.