United States and Ohio v. OhioHealth Corp.

February 23, 2026

Ohio and the United States Department of Justice filed a complaint against OhioHealth Corporation in February 2026.  The complaint states that OhioHealth is the dominant hospital system in Columbus and alleges its market power comes from its size, the location of its facilities, and its control of rural hospitals that insurers need to include in…

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Ohio v. Ascend Wellness Holdings, Inc., et al.

February 9, 2026

Ohio brought a lawsuit against nine multistate cannabis operators (“MSOs”) in February 2026. The complaint states that MSOs are often vertically-integrated companies across the cultivation, processing and dispensing supply chain to distribute their branded products within a state. The complaint alleges the defendants have conspired to form cartels which limit the availability of independent Ohio…

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Michigan v. BP P.L.C., et al.

February 9, 2026

Michigan brought a complaint against BP, Shell, Chevron, Exxon and the American Petroleum Institute in January 2026.  The complaint alleges that the defendants conspired to stall competition to their fossil fuel business from renewable energy and maintain their dominance in the energy market.  The complaint alleges that the defendants engaged in conduct including abandoning renewable…

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Virginia et al v. Zillow Group Inc et al

December 18, 2025

Viriginia, Arizona, Connecticut, New York, and Washington state brough suit against Zillow and Redfin in the District Court for the Eastern District of Virginia in October 2025.  The plaintiff states allege that the defendants executed an illegal agreement under which Redfin exited the internet listing services (“ILS”) market for buildings with more than 25 units…

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Board of Regents v. Atlantic Coast Conference, No. (Cir. Ct. Pr. George’s Cty. Maryland, Jan. 18, 2013)

October 9, 2020

After the University of Maryland decided to leave the Atlantic Coast Conference (ACC) for the Big Ten Conference for its collegiate athletics, the ACC sued the university in North Carolina. The state then sued in Maryland courts, seeking a declaratory judgment that the fee imposed by the ACC on the university was excessive and was a violation of state antitrust laws because the fee was an illegal restraint of trade. The case has been stayed and the stay has been appealed.

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