News & Analysis as of

Filing Requirements Merger Controls State Attorneys General

Skadden, Arps, Slate, Meagher & Flom LLP

Pre-Merger Notification Proliferation

What is new: Some U.S. states have enacted pre-merger notification regimes of general applicability, requiring parties making HSR filings to also notify state attorneys general, with similar legislation pending in other...more

Morgan Lewis

‘Mini-HSR’ Acts Take Effect in Washington and Colorado, with Similar Legislation Pending in Other States

Morgan Lewis on

Colorado and Washington state recently became the first states to adopt their own smaller versions of the Hart-Scott-Rodino Antitrust Improvements (HSR) Act. These “mini-HSR” state laws require certain parties that submit...more

Clark Hill PLC

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

Clark Hill PLC on

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

K&L Gates LLP

Colorado Enacts Uniform Antitrust Pre-Merger Notification Law

K&L Gates LLP on

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

McGuireWoods LLP

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

McGuireWoods LLP on

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

Goodwin

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

Goodwin on

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”

White & Case LLP on

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

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