U.S. Justice Department updates state merger review collaboration in local antitrust cases

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US antitrust merger review update

Highlights

U.S. Department of Justice updated its framework, emphasizing that federal antitrust resources focus on mergers with regional or national impact while states address intrastate deals.
Since January 2026, the Antitrust Division partnered with California and Tennessee Attorneys General to enter consent decrees on cement and asphalt mergers over regional competition concerns.
The update clarifies that companies in sectors like building materials may face intensified state-level scrutiny when mergers primarily threaten competition in single-state or local markets.

Framework for local and national merger reviews

As reported by Justice Department, citing the U.S. Department of Justice, the Antitrust Division is updating its collaboration with state Attorneys General on mergers with predominantly intrastate effects, emphasizing that federal resources are generally directed toward transactions with regional or national implications.

Associate Attorney General Stanley E. Woodward, Jr. said principles of federalism support that approach, while noting the department may still investigate local transactions when a case raises an antitrust issue of national significance. He also said the department will generally form its own view on the resolution of mergers of national importance, though it may work with state enforcers that make a distinct contribution to an investigation.

Deputy Assistant Attorney General G. Charles Beller said federal and state enforcers serve different constituencies and bring different competencies. He said that relationship works best when each side defers to the agency with greater relative competence in matters tied to distinctly federal or local interests.

State-led settlements and regional market impact

Since January 2026, the Antitrust Division says it has partnered with the Attorneys General of California and Tennessee to enter consent decrees with merging parties in the cement and asphalt industries, addressing potential harm to competition in regions within those states.

The division also referred investigations involving asphalt markets in New York, Pennsylvania and New Jersey to those states' Attorneys General, which later reached settlements with the parties over local competition concerns. In addition, the department says it has jointly investigated both local and multistate mergers with states when issues justified shared federal and state involvement, while also consulting closely with state officials on other local merger matters.

The update signals a more defined allocation of antitrust enforcement work in markets where competitive harm is geographically limited. For companies pursuing deals in sectors such as building materials, that could mean closer scrutiny from state officials when local purchasers or single-state markets face the greatest competitive risk.

Our earlier article on Mycron Steel Bhd’s withdrawal of its judicial review over the removal of anti-dumping duties explained how the company ended its legal challenge after what it called constructive discussions, rather than a court decision. We also outlined the policy change that scrapped duties on certain cold-rolled steel imports from South Korea and Vietnam, and noted that attention then shifted to the commercial impact on pricing and competition in the local steel market.

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