State Pre-Merger Notification Legislation Tracker

In 2024, the Uniform Law Commission drafted The Uniform Antitrust Pre-Merger Notification Act (“the Uniform Act”). The Uniform Act requires a party filing an HSR form to submit a copy of the form to the state attorney general of the state that passed the law if one of two conditions are met:

The filing party maintains its principal place of business in the state that passed the law; or
The filing party has net annual sales in the state of at least 20% of the HSR filing threshold ($26.78 million based on the 2026 HSR filing threshold of $133.9 million).

The chart below tracks the introduction and passage of the Uniform Act.

You can read more about the laws in New State Notification Requirements for Mergers and Acquisitions.

State/Territory	Date Introduced	Status	Distinctions from Uniform Act
West Virginia	Jan. 14, 2026	Introduced in 2025.	No substantive changes to the text of the Uniform Act.
Indiana	Jan. 8, 2026	Passed first chamber.	The Indiana bill exempts healthcare entities that have already filed under the state's existing healthcare merger notification statute from the HSR notification requirements. The Indiana bill added procedural protections for enforcement actions by requiring written notice and a three-day cure period.¹ The bill also extends the notice period for interstate disclosure from two to five business days.
Nevada	Feb. 19, 2025	Not introduced in current session.	The Nevada bill exempts gaming licensees and their affiliates from the notification requirements.
Utah	Feb. 11, 2025	Passed first chamber in 2025.	No substantive changes to the text of the Uniform Act.
Colorado	Feb. 5, 2025	Effective.	No substantive changes to the text of the Uniform Act.
Hawaii	Jan. 14, 2025	Introduced in 2025.	No substantive changes to the text of the Uniform Act.
Washington DC	Jan. 7, 2025	Introduced in 2025.	No substantive changes to the text of the Uniform Act.
California	Dec. 2, 2024	Signed, goes into effect on Jan. 1, 2027.	The bill would require companies to file the HSR form within one business day of the federal filing, not contemporaneously.
Washington	Dec. 30, 2024	Effective.	The Washington bill expands the filing requirement by adding a third condition: the filing party is a provider or a provider organization conducting business in the state.

Current as of March 2, 2026.

¹ Note that unlike most other states that have adopted the Uniform Act, the Indiana and California legislatures opted to use "impose" rather than "seek imposition of" [a civil penalty], which allows their Attorneys General to directly impose a civil penalty without first seeking a court order.