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Our Curious Amalgam

Our Curious Amalgam

#366 What's the State of Mini-HSR Regimes? Perspectives from the Colorado & Washington State AGs

Feb 23, 2026 · 36m

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State attorneys general are taking a more active role in merger control, with Colorado and Washington leading the way on new "mini-HSR" notification regimes. What do these new state pre-merger filing laws require, and how should companies and practitioners navigate them alongside the federal Hart-Scott-Rodino Act? Assistant Attorneys General Paula Pera Czollak and Bryn Williams join hosts Puja Patel and James Hunsberger to discuss the origins of the Uniform Antitrust Pre-Merger Notification Act, lessons from the first months of filings in Colorado and Washington, key interpretive questions practitioners are raising, and what the spread of state mini-HSRs could mean for national antitrust…