
California has enacted a sweeping new premerger notification law that will significantly expand the state’s visibility into M&A activity. On Feb. 10, 2026, Governor Gavin Newsom signed the California Uniform Antitrust Premerger Notification Act (SB 25), making California the third state—after Washington and Colorado—to adopt a broad, cross‑industry premerger filing regime. The law becomes effective Jan. 1, 2027. Previously, notifications were required only of healthcare, retail grocery and retail drug transactions.


