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Premerger Notifications State Attorneys General

Hogan Lovells

State premerger notification requirements take effect this summer

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Washington and Colorado recently passed laws that require parties that file premerger filings pursuant to the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (HSR Act) and meet certain state-specific thresholds to...more

BakerHostetler

State-Level Merger Scrutiny Grows: Washington, Colorado Lead Expansion of State Premerger Notification Laws

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Earlier this year, Washington state enacted a version of the nascent Uniform Antitrust Pre-Merger Notification Act (the Uniform Act), which is slated to take effect on July 27....more

Ballard Spahr LLP

Washington State Merger Notification Requirements Start This Month

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Are you contemplating a merger or acquisition with a connection to Washington State? Effective July 27, 2025, any transaction requiring pre-notification under the federal Hart-Scott-Rodino Antitrust Improvements Act of 1976...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

K&L Gates LLP

Colorado Enacts Uniform Antitrust Pre-Merger Notification Law

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On 4 June 2025, Colorado became the second state—following the state of Washington—to enact a broad, state-level, industry-agnostic premerger notification regime. Under Colorado’s new law, any party that submits a filing...more

Bass, Berry & Sims PLC

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

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

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

McCarter & English, LLP

Recent Trends in State Antitrust Enforcement

State attorneys general (state AGs) are expected to ramp up antitrust enforcement. Some would argue that enforcement is an effort to fill a perceived gap left by the Trump administration, but state AGs have been signaling...more

Cadwalader, Wickersham & Taft LLP

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

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

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

McDermott Will & Emery

Washington State Enacts Merger Review Regime

McDermott Will & Emery on

Washington is the first state to enact the Uniform Antitrust Premerger Notification Act, which requires merging parties that submit a federal filing under the Hart-Scott-Rodino (HSR) Act (15 U.S.C. Sec. 18(a)) to also submit...more

Bass, Berry & Sims PLC

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

Bass, Berry & Sims PLC on

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

Goodwin

Washington Becomes First State to Adopt Filing Requirements for HSR-Reportable Transactions Outside of Healthcare

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On April 4, 2025, Washington became the first state to enact a law requiring a general pre-merger notification of HSR-reportable deals to state enforcers, regardless of industry....more

Sheppard Mullin Richter & Hampton LLP

State Antitrust Enforcement Roundup: New Laws; New Potential Legislation; and New (and Broader) Areas of Focus

The number of U.S. states implementing or considering new antitrust laws (or supplementing existing laws) targeting proposed transactions continues to grow. As detailed in our healthcare merger matrix, many states have...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

Wilson Sonsini Goodrich & Rosati

States Expand Premerger Filings Family by Adopting “Baby-HSR” Laws to Review More Transactions

In a growing trend, states are requiring more premerger filings by enacting “baby-HSR” laws modeled after the federal Hart-Scott-Rodino (HSR) Act. These state-level statutes require parties to certain mergers and acquisitions...more

Sheppard Mullin Richter & Hampton LLP

Navigating the Matrix of State Healthcare Approvals

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

Sheppard Mullin Richter & Hampton LLP

Amending New York’s Donnelly Act: If at First You Don’t Succeed, Try, Try, and Try Again

A proposed amendment to New York’s Donnelly Act, introduced earlier this month, would significantly broaden the scope of the antitrust statute enacted in 1899. New York Senate Bill 335, titled the “Twenty-First Century...more

Allen Matkins

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

Allen Matkins on

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

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

WilmerHale

Developments in Antitrust Law: Keep an Eye on New York

WilmerHale on

Although much attention recently has been focused upon debates in Congress, potential legislative changes to U.S. antitrust law are not limited to proposals at the federal level. Many states are considering changes to their...more

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