On the Dash:
- CDK Global won summary judgment on Tekion’s monopolization and attempted monopolization claims.
- The court found CDK’s share stayed below 50% in 2023 and 2024 while Tekion kept growing.
- The order is partial and covers only the two antitrust counts CDK asked about.
A federal judge has ruled for CDK Global on the central antitrust claims in its fight with rival Tekion, finding that no reasonable jury could conclude CDK held monopoly power in the dealer management system market. U.S. District Judge Jacqueline Scott Corley granted CDK summary judgment on Tekion’s monopolization and attempted monopolization claims in an order filed Nov. 10.
The order doesn’t settle every dispute between the two companies, though. It covers only the two antitrust counts CDK asked the court to decide, and it came after oral argument on Oct. 22. Tekion sued CDK in December 2024, and the fight since then has included a data access dispute, a countersuit and several court rulings.
Court finds CDK’s share fell below 50% as Tekion grew
The court found no genuine dispute that CDK’s share of the U.S. franchise dealer DMS market was below 50% in 2023 and 2024, whether measured by dealership locations or by revenue. CDK said its share of locations peaked at 42.3% at the end of 2022 and fell to 36.4% by March 2026. Tekion had argued that CDK held 50% to 60% of the market, but the judge found its evidence was outdated.
In her Nov. 10 order, Judge Jacqueline Scott Corley said, “The available evidence does not support a finding that CDK possessed monopoly power during the relevant time period or was dangerously close to obtaining such powers.”
Tekion grew and won customers from CDK throughout the period, including Asbury Automotive Group, and its DMS revenue more than doubled between 2023 and 2024. Judge Corley also denied Tekion’s request for more discovery and excluded its expert’s revenue share estimate as unreliable. Because CDK’s share was falling, she found no dangerous probability that it would gain monopoly power.
How the Tekion and CDK dispute reached this point
Tekion filed its federal antitrust lawsuit in December 2024, accusing CDK of using anticompetitive tactics to keep dealers on its platform and of holding dealer data hostage. Tekion asked for damages and an injunction that would force CDK to move dealer data right away.
The suit followed a data fight over Asbury Automotive Group, when a court ordered CDK to hand over data from Asbury dealerships to Tekion after CDK initially resisted. CDK countersued Tekion in February 2025, alleging Tekion illegally accessed confidential dealer data to win business. Tekion denied the claims and called the suit without merit. Judge Corley let Tekion’s case move forward in July 2025, when she denied CDK’s motion to dismiss.
