Tools
HSR threshold checker
Quick check of whether a transaction is large enough to trigger Hart-Scott-Rodino premerger notification.
Uses the 2025 FTC threshold figures (size of transaction $126.4M, size of person test, automatic threshold $505.8M). Note that exemptions, aggregation rules, and the new substantive notification requirements are more nuanced than this tool can fully capture.
Educational only. Not legal advice. The HSR rules include exemptions, aggregation rules, ordinary-course exceptions, and special tests that this calculator does not capture. Always confirm any notification decision with antitrust counsel.