McDonald's has been hit with a proposed nationwide class action in federal court in Chicago, alleging the fast-food giant illegally coordinates menu prices across its nearly 14,000 U.S. restaurants through an AI-powered pricing system. Filed on Friday, October 2, 2026, the complaint accuses the company of violating U.S. federal antitrust law by conspiring with independent franchisees to fix prices using algorithms trained on nonpublic data.
The allegations
The plaintiff, Michael Thomas of DeKalb, Illinois, is seeking to represent a class of potentially millions of McDonald's customers in the U.S. District Court for the Northern District of Illinois. The lawsuit claims McDonald's has enforced a "coercive price-fixing agreement" on its franchisees since 2019, with menu prices coordinated through a pricing engine that uses machine-learning algorithms to continually analyze data from millions of daily transactions.
"Independent businesses must set their prices independently," the lawsuit said, arguing that franchisees and the company should not be jointly setting prices. The complaint relies on reporting published last week by Reuters describing how McDonald's pricing engine works and noting that other fast-food companies are also turning to AI for pricing. Lark Turner, a lawyer for the plaintiff, said McDonald's is "leveraging its troves of data and its franchised system to nickel-and-dime consumers down to the last French fry." Industry outlet NRN reports that, according to McDonald's own statements, its prices increased 40% between 2019 and 2024.
McDonald's response
McDonald's rejected the allegations in a statement on Monday, October 5, calling them "speculative and uninformed." A later statement said the complaint is "filled with inaccuracies and we will vigorously defend against this lawsuit."
"AI does not set the price of a Big Mac or any other menu item," the company said. McDonald's maintained that franchisees make their own pricing decisions, that it imposes no pricing mandates, and that pricing recommendation tools and analytics are widespread across industries. CNBC-TV18 summarized both sides of the dispute.
A broader wave of algorithm cases
The McDonald's case is part of a wave of U.S. class actions in recent years alleging companies used algorithms or AI to illegally coordinate prices for hotel rooms, apartment rentals and other purchases. Courts are only beginning to test how existing antitrust law applies when pricing recommendations come from shared machine-learning models rather than direct communication between competitors.
The stakes are significant: McDonald's says it serves more than 70 million customers every day, operates more than 46,000 locations across more than 100 countries, and that about 95% of its restaurants are owned and operated by independent franchisees. The proposed class would cover potentially millions of those daily customers.
What comes next
The complaint has only just been filed, and the court has not yet ruled on whether it may proceed as a class action. As with any lawsuit, the allegations are claims by the plaintiff and have not been proven. How the court treats the line between a pricing recommendation tool and an unlawful price-fixing agreement — especially one allegedly running on shared AI — will determine whether this case becomes a landmark in the emerging legal fight over algorithmic pricing.
Watch: News coverage of the McDonald's AI price-fixing class action lawsuit on YouTube
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