New HSR Rule Developments | Kirkland & Ellis LLP

Welcome to your one-stop-shop for information related to HSR rule changes. Professionals from our mergers clearance and antitrust practices keep you up to date on the latest developments regarding the drastic expansion of HSR filing burdens.

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20 February 2026 Kirkland Alert District Court Vacates New HSR Rules, Setting Up Appellate Showdown — New Rules Remain in Effect Until Fifth Circuit Issues Ruling
20 January 2026 Kirkland Alert [MOBILE DOWNLOAD] Revised Hart-Scott-Rodino Act Thresholds and Filing Fees Announced
22 January 2025 Kirkland Alert [MOBILE DOWNLOAD] Revised Hart-Scott-Rodino Act Thresholds, Filing Fees and Civil Penalty Amounts Announced
14 November 2024 Kirkland Alert New HSR Rules Are Effective February 10, 2025
14 October 2024 Kirkland Seminar Introduction to the New Premerger Notification Rules

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10 October 2024 Kirkland Alert U.S. Antitrust Agencies Substantially Expand Hart-Scott-Rodino Filing Burdens in New Rules
05 February 2024 Kirkland Alert [MOBILE DOWNLOAD] Revised HSR Act Thresholds, Filing Fees and Civil Penalty Amounts Announced
06 July 2023 Kirkland Alert Dramatic Overhaul Proposed to Hart‑Scott‑Rodino Pre-Merger Form
27 January 2023 Kirkland Alert Revised Hart-Scott-Rodino Act Thresholds, Filing Fees and Civil Penalty Amounts Announced