Hart-Scott-Rodino Antitrust Improvements Act and the premerger notification rules
15 U.S.C. § 18a, 16 CFR Parts 801 to 803 · Read 2026-08-15
In force since 1976. The Commission revises the size thresholds and filing fees each year, and the revised notification form took effect on 10 February 2025.
Identifier
- Identifier
- 15 U.S.C. § 18a, 16 CFR Parts 801 to 803
- Level
- Federal
- Status
- In force
- Adopted
- 1976-09-30
- Applies from
- 1976-09-30
- Supervisory bodies
- FTC, DOJ Antitrust
Named requirements
Coverage tests
Size of transaction, size of person and the rules on who holds what.
Notification and report form
The form, its instructions and the documents that must accompany a filing.
Waiting period
The statutory waiting period before the parties may close.
Request for additional information
The second request that extends the waiting period.
Official source
EU acts on the same ground
- eumr
The EU Merger Regulation runs the same kind of suspensory review, but its turnover thresholds and one-stop-shop principle differ from the HSR size tests.
United States case law
20 decisions · Read from CourtListener, Free Law Project on 2026-08-22.
- FTC v. Microsoft Corporation
136 F.4th 9549th Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Ninth Circuit when you click. No permanent storage on our side.
- Llacua v. Western Range Association
930 F.3d 116110th Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Tenth Circuit when you click. No permanent storage on our side.
- XL Specialty Insurance v. Bollinger Shipyards, Inc.
800 F.3d 1785th Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Fifth Circuit when you click. No permanent storage on our side.
- Pharmaceutical Research & Manufacturers of America v. Federal Trade Commission
416 U.S. App. D.C. 129D.C. Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the D.C. Circuit when you click. No permanent storage on our side.
- St. Joseph Hospital, Augusta, Georgia, Inc. v. Health Management Associates, Inc.
705 F.3d 128911th Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Eleventh Circuit when you click. No permanent storage on our side.
- St. Joseph Hospital, Augusta, Georgia, Inc. v. Health Management Associates, Inc.
11th Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Eleventh Circuit when you click. No permanent storage on our side.
- In re Sulfuric Acid Antitrust Litigation
703 F.3d 10047th Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Seventh Circuit when you click. No permanent storage on our side.
- Ohio Chemical Servic v. Falconbridg
7th Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Seventh Circuit when you click. No permanent storage on our side.
- CSX Corp. v. Children's Investment Fund Management (UK) LLP
654 F.3d 2762d Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Second Circuit when you click. No permanent storage on our side.
- Roche Diagnostics Co v. Medical Aut
7th Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Seventh Circuit when you click. No permanent storage on our side.
- Ginsburg v. INBEV NV/SA
623 F.3d 12298th Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Eighth Circuit when you click. No permanent storage on our side.
- Marty Ginsburg v. InBev NV/SA
8th Cir.Open to review by a higher court, the source does not state the outcome
Ask NovaCopilotGet the opinionRetrieved directly from Court of Appeals for the Eighth Circuit when you click. No permanent storage on our side.
Change monitoring
The row is re-read against the publisher's own publication on a fixed interval. The dates below can be checked on the spot and travel with the API response.
| Field | Value |
|---|---|
| Register | FTC, 15 U.S.C. § 18a, 16 CFR Parts 801 to 803 |
| Publisher | U.S. Federal Trade Commission |
| Last read | 2026-08-15 |
| Interval | Every 30 days |
| Next re-read | 2026-09-14 |
| Status | Re-read overdue |
Row history
Dated events concerning this exact row, newest first. No event appears here without a date in a primary source.
| Date | Event | Source |
|---|---|---|
| 2026-08-15 | Row read against the official publication | U.S. Federal Trade Commission |
| 1976-09-30 | Adopted under 15 U.S.C. § 18a, 16 CFR Parts 801 to 803 | U.S. Federal Trade Commission |
| 1976-09-30 | Date of application according to the publisher | U.S. Federal Trade Commission |
Monitoring states when the row was checked, not how the legal position should be assessed.
Cite this row
The string below travels with a memo, a case file or an agent chain. The same string sits in the citation field of the API response.
15 U.S.C. § 18a, 16 CFR Parts 801 to 803, Hart-Scott-Rodino Antitrust Improvements Act and the premerger notification rules. NovaCopilot, https://legal.exploreworldai.com/us/regler/hart-scott-rodino (hämtad 2026-11-02, bevis sha256:120da330ebeaa261, bygge legal-2026-11-02).
- sha256:
- 120da330ebeaa26196f020f33b2f86cc66f56e7a918573a3b246c1259f6cecd1
- hämtad:
- 2026-11-02
- source_confidence:
- official
- bygge:
- legal-2026-11-02
- officiell källa:
- https://www.ecfr.gov/current/title-16/chapter-I/subchapter-H
Official publication. The address points to the authority or court that published the row. Office of the Federal Register, eCFR.
The row is a source reference with an official identifier. No legal advice and no compliance decision.
Verifiable trust signals
- Source-linked answers and explicit evidence gaps
- Obligations, controls, risks and consequences
- Stable objects and verifiable checksums
- Rule-based objects, optional source-linked reasoning
- Model card, source status and audit