McDonald's AI Price-Fixing Lawsuit - Did a Secret Algorithm Inflate Your Menu Prices?

Quick Facts

• Case filed: October 2, 2026
• Court: U.S. District Court, Northern District of Illinois (Judge Thomas M. Durkin)
• Case number: 1:26-cv-12149
• Plaintiff's law firm: Clarkson Law Firm
• Alleged conduct: AI-assisted price coordination across 14,000+ U.S. locations
• Settlement: None yet - investigation stage

A new federal class action lawsuit filed in October 2026 alleges that McDonald's USA deployed an artificial intelligence pricing engine to secretly coordinate menu prices across its more than 14,000 U.S. franchise restaurants. If the allegations prove true, millions of McDonald's customers may have been overcharged for years on everything from Big Macs to breakfast sandwiches.

What Are the Allegations?

The lawsuit, Thomas v. McDonald's USA, LLC, No. 1:26-cv-12149, was filed in the Northern District of Illinois by the Clarkson Law Firm on behalf of a proposed class of U.S. consumers who purchased food at McDonald's locations.

The complaint alleges that McDonald's deployed a machine learning pricing engine that pooled sales and pricing data from thousands of franchise locations. The system allegedly used what plaintiffs call a "30% rule" - a pricing threshold that effectively coordinated prices across independent franchise operators without any direct communication between them.

The lawsuit claims this conduct violates Section 1 of the Sherman Antitrust Act, which prohibits agreements that unreasonably restrain trade. Plaintiffs argue that by sharing competitive pricing data through a common algorithm, McDonald's franchises were effectively operating as a pricing cartel - even if no human ever picked up the phone to discuss prices.

Why This Case Matters

The McDonald's lawsuit is part of a growing wave of antitrust litigation targeting AI pricing tools. Similar cases have been filed against landlords for using algorithmic rent-setting software and against hotels for coordinated rate management platforms. The core legal theory - that an algorithm can serve as the mechanism for illegal price coordination - remains largely untested in federal courts.

McDonald's has not been convicted of any wrongdoing, and the case is at an early stage with no class certification or settlement yet.

Who Might Qualify?

The proposed class includes U.S. consumers who purchased food at McDonald's locations during the period covered by the alleged pricing conduct. The exact class period has not yet been determined by the court.

Because no settlement has been reached, there is no claim form to file at this time. If a settlement is announced, ClaimActions.com will publish the claim deadline, eligibility requirements, and filing instructions.

What Happens Next?

• McDonald's will respond to the complaint and may move to dismiss
• Plaintiffs will seek class certification - court approval to proceed on behalf of all affected consumers
• If the case survives early motions, the parties may enter settlement negotiations
• A trial or settlement could be years away

Sources: Thomas v. McDonald's USA, LLC, No. 1:26-cv-12149, N.D. Ill. (filed Oct. 2, 2026); Clarkson Law Firm.