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Hart-Scott-Rodino Act › Filing Requirements

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 -
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

Fenwick & West LLP

Washington Becomes First State to Enact ‘Mini HSR’ Notification Requirement

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As of July 27, 2025, federal Hart-Scott-Rodino (HSR) Act filings will also need to be submitted to the Washington Attorney General (WA OAG) under Washington State’s Antitrust Premerger Notification Act (APNA) if the parties...more

Hogan Lovells

State premerger notification requirements take effect this summer

Hogan Lovells on

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

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

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

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

McGuireWoods LLP

Washington, Colorado First States to Enact Uniform Antitrust Pre-Merger Notification Act

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Washington and Colorado are the first two states to pass laws requiring certain parties to affirmatively submit their Hart-Scott-Rodino (HSR) filings to their states’ attorneys general. Both states passed laws modeled on the...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

Akin Gump Strauss Hauer & Feld LLP

The First 100 Days of the New HSR Rules: Assessing the Impact

Akin Gump Strauss Hauer & Feld LLP on

The new Hart-Scott-Rodino (HSR) requirements went into effect on February 10, 2025, meaning that May 21, 2025 marked their 100th day in effect. Here are just a few of our observations from the first 100 days of the new HSR...more

Vinson & Elkins LLP

First 100 Days of the New HSR Rules

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One hundred days ago, sweeping revisions to the Hart-Scott-Rodino Act Premerger Notification Form took effect. The revisions have significantly increased the time and effort to prepare HSR filings and have led filing parties...more

Akerman LLP

Preparing for an HSR Filing in the Ordinary Course of Business

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Earlier this year, the Federal Trade Commission (FTC), with concurrence from the Antitrust Division of the Department of Justice (DOJ), issued a Final Rule implementing substantial changes to the pre-merger notification...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

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

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

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

EDRM - Electronic Discovery Reference Model

HSR Filings Fall Sharply in March 2025, Lowest Monthly Total Since Early Pandemic

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ComplexDiscovery Editor’s Note: The March 2025 Hart-Scott-Rodino (HSR) filings dropped to 89 transactions, marking the lowest monthly total since the early months of the COVID-19 pandemic in April and May 2020. This...more

HaystackID

March 2025 HSR Filings Hit Five-Year Low Amid Regulatory Overhaul and Legal Challenge

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The federal premerger notification program administered under the Hart-Scott-Rodino (HSR) Act recorded just 89 transactions in March 2025, marking the lowest monthly filing total in nearly five years. This downturn is the...more

Proskauer Rose LLP

Proskauer Hedge Fund Trading Guide Chapter 4: Stock Acquisitions: Key Requirements and Timing Considerations of Hart-Scott-Rodino

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Proskauer’s Practical Guide to the Regulation of Hedge Fund Trading Activities offers a concise, easy-to-read overview of the trading issues and questions we commonly encounter when advising hedge funds and their managers. It...more

Herbert Smith Freehills Kramer

Strategies for Preparing the New Hart-Scott-Rodino Forms

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On Feb. 10, 2025, the new premerger notification and report forms under the Hart-Scott-Rodino (HSR) Act became effective. The new HSR forms make significant changes to the reporting obligations of both acquiring and acquired...more

Epstein Becker & Green

Revised HSR Thresholds Now in Effect

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Each year, the minimum jurisdictional thresholds associated with the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (HSR) are adjusted by the Federal Trade Commission (FTC). The 2025 adjustments went into effect on...more

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