District Court Vacates New HSR Rules, Setting Up Appellate Showdown — New Rules Remain in Effect Until Fifth Circuit Issues Ruling
On Thursday, February 12, 2026, one year and two days to the date of the Federal Trade Commission’s new rules under the Hart-Scott-Rodino Act (HSR Act) becoming effective, the U.S. District Court for the Eastern District of Texas issued an order vacating the new rules in their entirety. The new rules significantly expanded the documentary and informational disclosures required under the HSR Act. The court found that the FTC exceeded its statutory authority and engaged in “arbitrary and capricious” rulemaking by failing to demonstrate that the benefits of the new rules reasonably outweighed their substantial costs.
On February 19, 2026, the U.S. Court of Appeals for the Fifth Circuit granted the FTC’s emergency relief motion to stay the decision until further order and set short briefing deadlines, with both parties' briefs due this coming week: Appellees’ response brief is due February 23, and Appellants’ reply brief is due February 26.
Key Takeaways
- The new HSR rules are technically vacated in their entirety. However, the order is stayed as the case proceeds through the appellate process.
- The Premerger Notification Office confirmed on February 20, 2026, that the new HSR rules filings will remain in effect until further order from the Fifth Circuit, at a minimum through February 26, but likely longer.
- The Kirkland HSR team will continue to monitor the situation closely and provide as much notice as possible in the event that any pivots are required.
Please visit the Kirkland New HSR Rule Development Page for more information
