Share on LinkedInShare on LinkedIn

ARTICLE · 24 FEBRUARY 2026

California Passes "Mini-HSR" Act

Milbank
Milbank
Contributor
Milbank

Milbank

Milbank has been in London for over 40 years, assisting clients with their most complex,...

View firm profile
Explore more from Milbank

On February 10, 2026, California Governor Gavin Newsom signed Senate Bill No. 25 into law, otherwise known as the California Uniform Antitrust Pre-Merger Notification Act.

United StatesAntitrust/Competition Law
Fiona Schaeffer
Fiona Schaeffer
Adam Di Vincenzo
Adam Di Vincenzo
Richard Parker
Richard Parker
Grant Bermann
Grant Bermann
Alexis Brown-Reilly
Alexis Brown-Reilly
John Ceccio
John Ceccio
Author LinkedIn connections

On February 10, 2026, California Governor Gavin Newsom signed Senate Bill No. 25 into law, otherwise known as the California Uniform Antitrust Pre-Merger Notification Act. Under the new law, starting on January 1, 2027, parties submitting HSR filings to the Federal Trade Commission (FTC) and Department of Justice (DOJ) must also submit materials to the California State Attorney General's office when:

  1. A party has its principal place of business in California, or
  2. A party has annual net sales in California of at least 20% of the HSR transaction filing threshold (currently $26.78 million).

Click here to read the full insight: "California Passes "Mini-HSR" Act."

The content of this article is intended to provide a general guide to the subject matter. Specialist advice should be sought about your specific circumstances.

The content of this article is intended to provide a general guide to the subject matter. Specialist advice should be sought about your specific circumstances.

See more popular content from