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Antitrust & Trade Reg.

Oct. 5, 2026

Law firm challenges Thomson Reuters' $650M Casetext acquisition

A Carlsbad law firm claims Thomson Reuters bought AI legal research upstart Casetext to eliminate a lower-cost rival and preserve Westlaw's pricing power in a market dominated by Westlaw and LexisNexis.

A Carlsbad law firm is turning to the courts in a bid to lower the cost of its Westlaw subscription.

The Rubin Law Firm, PC, sued Thomson Reuters Corp. Thursday, alleging its $650 million acquisition of legal research startup Casetext in 2023 violated federal and state antitrust laws by eliminating a lower-cost competitor and preserving a legal research duopoly dominated by Westlaw and LexisNexis.

The lawsuit claims Thomson Reuters acquired Casetext, an early adopter of a...

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