On February 10, 2026, California enacted Senate Bill 25 (“SB 25”), known as the California Uniform Antitrust Pre-Merger Notification Act. The new law takes effect on January 1, 2027, making California the third state—following Washington (effective July 27, 2025) and Colorado (effective August 6, 2025)—to implement a “mini-HSR” regime modeled after the Uniform Antitrust Pre-Merger Notification Act (“UAPNA”). The legislation reflects the growing state-level focus on merger oversight, and it signals California’s continuing intent to increase early pre-merger scrutiny and concurrent review of transactions with federal authorities. Click here to continue reading the full version of this alert.
State-Level Merger Control Grows: California Joins “Mini-HSR” Trend with Senate Bill 25
