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Hart-Scott-Rodino Act › State Attorneys General › Mergers

The Hart-Scott Rodino Antitrust Improvements Act is a United States federal statute enacted in 1976 establishing the federal premerger notification program. Under the Act, parties contemplating mergers or... more +
The Hart-Scott Rodino Antitrust Improvements Act is a United States federal statute enacted in 1976 establishing the federal premerger notification program. Under the Act, parties contemplating mergers or acquisitions must notify the Department of Justice and the Federal Trade Commission prior to completing the transaction. Once notified, the DOJ and FTC investigate and make a determination as to whether the proposed transaction will adversely impact U.S. commerce and competition within the market. less -
Clark Hill PLC

Colorado and Washington’s new UAPNA reporting requirements: What M&A dealmakers need to know about these groundbreaking laws

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Colorado and Washington have enacted groundbreaking laws modeled after the Uniform Law Commission’s Uniform Antitrust Pre-Merger Notification Act (UAPNA), requiring parties to certain Hart-Scott-Rodino Act (HSR) reportable...more

Cozen O'Connor

Washington Becomes First State to Require Premerger Notification Filing

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Washington AG Nick Brown announced that Washington is the first state to require companies to file a premerger notification with the state AG’s office concurrently with the federal filing required under the Hart-Scott-Rodino...more

Cozen O'Connor

Washington and Colorado Enact Uniform Premerger Notification Laws: What Businesses Need to Know About The New Era in State AG...

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As of July 27, Washington State is now the first state to enact a uniform antitrust premerger notification law, and as of August 6, 2025, Colorado will be the second. Both new notification laws are similar, as they are...more

Vinson & Elkins LLP

“Mini-HSR Acts” Multiply in the States; Merger Enforcement Developments in Washington, Colorado and More

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Parties to transactions should be aware of new requirements for state-level merger reporting – so-called “mini-HSR Acts” – modeled on the Uniform Antitrust Pre-Merger Notification Act (“UAPNA”). Washington and Colorado have...more

Dinsmore & Shohl LLP

Make Sure to CC the AG: Colorado and Washington Require State-Level Merger Notices

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Colorado and Washington have each enacted statutes modeled after the Uniform Law Commission’s Uniform Antitrust Pre-Merger Notification Act. Soon, both states will require parties to certain mergers and acquisitions (M&A)...more

Paul Hastings LLP

New Mini-HSR Laws Take Effect This Summer

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Starting Sunday, July 27, 2025, any party to an M&A transaction that triggers a federal Hart-Scott-Rodino (HSR) Act filing must also submit a copy to the Washington attorney general if the filing party (1) maintains a...more

Miles & Stockbridge P.C.

Washington State Enacts First Uniform Antitrust Premerger Notification Act

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On April 4, Washington became the first state to enact the Uniform Antitrust Premerger Notification Act (APNA). Under the APNA, a person making a Hart-Scott-Rodino (HSR) filing on or after July 27, 2025 must provide a copy of...more

Stinson LLP

Colorado Joins the "Baby" HSR Trend

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State attorneys general (AGs) have a legal right to challenge anticompetitive mergers, both under the federal Clayton Act and their own state antitrust laws. And in recent years, state AGs have played increasingly larger...more

Bass, Berry & Sims PLC

Colorado Enacts "Mini-HSR" Law, Joining Growing State-Level Premerger Filing Trend

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On June 4, Colorado became the second state to adopt the Uniform Antitrust Premerger Notification Act (Act) when Governor Jared Polis signed SB25-126 into law. Like Washington’s version of the Act, Colorado’s new law imposes...more

Axinn, Veltrop & Harkrider LLP

State by State, Pre-Merger Notifications Expand

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In the wake of the recent major revisions to the federal merger review form, states are also getting into the act, creating broad new transaction notification requirements. Such notification requirements are not completely...more

Cadwalader, Wickersham & Taft LLP

Washington State Adopts First Broad State Antitrust Premerger Notification Act and Filing Requirement

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Effective July 27, 2025, any person that files a Hart-Scott-Rodino (HSR) Act Notification and Report Form (HSR Form) with the Federal Trade Commission (FTC) and the Department of Justice (DOJ) must also submit an electronic...more

Frost Brown Todd

Antitrust Developments Update for April 2025

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In our last antitrust developments publication, we commented on the challenge to the new Hart-Scott-Rodino Antitrust Improvements Act (HSR Act) final rule brought by the U.S. Chamber of Commerce and other parties in the...more

Latham & Watkins LLP

Washington Introduces State-Level Merger Notification Rules

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States’ merger review and enforcement initiatives continue to expand as Washington adopts the nation’s first “mini-HSR” rule. On April 4, 2025, the State of Washington passed the Antitrust Premerger Notification Act...more

Bass, Berry & Sims PLC

Washington Enacts “Mini-HSR” Law, Expanding State-Level Premerger Filing Requirements

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On April 4, Washington became the first state to adopt the Uniform Premerger Notification Act (Act) when Washington Governor Jay Inslee signed the bill into law. The new statute imposes state-level premerger filing...more

White & Case LLP

Washington Becomes First State to Enact “Uniform Antitrust Pre-Merger Notification Act”

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On April 4, 2025, Gov. Bob Ferguson of Washington state signed S.B. 5122, making Washington the first state to enact the Uniform Law Commission’s “Uniform Antitrust Pre-Merger Notification Act.” Overview of the New...more

WilmerHale

Washington Enacts Broad Premerger Notification Law: The Cutting Edge of State Merger Review

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On April 4, 2025, Washington became the first state to enact the Uniform Antitrust Premerger Notification Act (Model Act), requiring parties to certain notifiable transactions under the Hart-Scott-Rodino Antitrust...more

Stinson LLP

Washington State First to Adopt "Baby HSR" Act

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Legislatures in several states have recently introduced bills that would require certain parties who submit Hart-Scott-Rodino (HSR) premerger filings to the federal government to provide that same information to the state. On...more

Axinn, Veltrop & Harkrider LLP

Axinn Associates at the Antitrust Spring Meeting - Antitrust under Trump: Redo of the first term, or something new?

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The Spring Meeting is the largest gathering of competition, consumer protection, and data privacy profes­sionals globally, with lawyers, academics, economists, enforcers, journalists, and students from around the world....more

Sheppard Mullin Richter & Hampton LLP

Navigating the Matrix of State Healthcare Approvals

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The outlook for federal antitrust enforcement remains murky, at best, with uncertainty about whether the new federal HSR rules, merger guidelines, and existing enforcement actions. The forecast for state antitrust...more

Allen Matkins

Bill Would Require Filing Of HSR Notifications With California's Attorney General

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In September, the Uniform Law Commission adopted the Uniform Antitrust Pre-Merger Notification Act.  The ULC does not, of course, actually enact any laws, it merely drafts and promotes laws that it would like to see made...more

Orrick, Herrington & Sutcliffe LLP

State AGs May Play a Bigger Role in Merger Review

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Republished with permission from, The Threshold, a publication of the Mergers and Acquisitions Committee of the American Bar Association Antitrust Law Section. This edition of the Threshold discusses the current and proposed...more

BakerHostetler

California Pharmacies Put on Notice: California’s Pharmacy Transaction Notice Requirement

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As of January 1, 2025, parties to transactions involving pharmacies located in California may also need to file a written notice with the California Attorney General. Assembly Bill 853 (AB 853), codified at Part 14 to...more

Fenwick & West LLP

New Regulatory Challenges for Private Equity and Hedge Fund Healthcare Transactions: Understanding the Impact of California’s AB...

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California’s healthcare ecosystem may soon experience significant regulatory changes as Assembly Bill 3129 (AB 3129) heads to Gov. Gavin Newsom's desk for approval....more

Holland & Knight LLP

California Ends the Legislative Session with Expanded Reporting Requirements, Less Clarity

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Amendments made by the California Office of Health Care Affordability (OHCA) to its cost and market impact review (CMIR) regulations became effective on Aug. 22, 2024, and serve to expand the scope of the Health Care Quality...more

McDermott Will & Schulte

States Want in on the Merger Review Fun

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While they have long taken a back seat to federal merger reviews, US states are becoming increasingly involved in merger reviews, including potentially requiring premerger notifications on a broad scale. On July 24, 2024, the...more

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