McDonald's has been sued in a nationwide class action in a Chicago federal court. The plaintiffs allege that the fast-food giant illegally coordinated menu prices across its franchises and company-owned restaurants through an AI-powered pricing system. The lawsuit was filed on Friday, October 2, 2026 — Reuters reported on the case on October 5.
The core of the complaint is that the company colluded with independent franchise owners in violation of federal antitrust law. The algorithms were allegedly trained on non-public data. The plaintiffs present themselves as a potential class acting on behalf of millions of customers — meaning that if the suit succeeds, its effects could reach McDonald's customers across the United States.
Key Allegations in the Lawsuit
The complaint alleges that since 2019 the company imposed a "mandatory pricing agreement" on franchise owners. In other words, according to the plaintiffs, pricing policy was centrally coordinated for at least seven years. The lawsuit explicitly states: independent businesses must set their prices on their own. The plaintiffs claim this principle was violated.
According to Reuters, the central element of the lawsuit is the allegation that the algorithms were trained on non-public data. The system is alleged to use franchisees' confidential sales figures to generate price recommendations. The plaintiffs characterize this mechanism as a hidden agreement between the company and independent franchisees.
The gravity of the allegations lies in the fact that this is not about a single product or a single region, but about one unified system across the entire network. According to the complaint, the recommendations were in practice presented as mandatory requirements — the company rejects that interpretation.
How the "Pricing Engine" Allegedly Works
According to Bloomberg Law, the class action was filed on October 2 by customer Michael Thomas in the U.S. District Court for the Northern District of Illinois. The complaint describes a centralized machine-learning "pricing engine": the system pools confidential sales data from franchises and corporate stores and generates price recommendations from it.
The plaintiffs claim that this very mechanism allowed McDonald's to coordinate prices across the network. The data was allegedly gathered from two sources — independent franchisees and the company's own stores. In this way, based on the network's overall sales picture, the system issues a price recommendation for each location.
Reuters and Bloomberg Law corroborate each other on the key details of the lawsuit: the case is in federal court in Chicago, the complaint was filed on October 2, and the charge is based on a violation of federal antitrust law. Both outlets note that the suit is framed as a nationwide class action.
McDonald's Response
The company firmly denied the allegations. In a statement, McDonald's called the claims speculative and baseless:
"AI does not set the price of a Big Mac or any other menu item" — McDonald's, in a statement to Reuters. According to the company, artificial intelligence sets the price of neither the Big Mac nor any other menu item.
The statement adds that McDonald's imposes no mandatory pricing instructions and that franchise owners make pricing decisions independently. According to Reuters, the plaintiffs' lawyers did not immediately respond to a request for comment.
The company's position is clear: pricing systems may exist, but the final decision belongs to the franchisees. That position directly contradicts the plaintiffs' claim of a "mandatory agreement." The conflicting interpretations will be decided in court — on one side, the claim that the algorithm's recommendations are binding; on the other, the emphasis on franchise independence.
Next Steps
Because the complaint was filed on October 2, the legal process is in its early stages. The federal court for the Northern District of Illinois in Chicago will hear the nationwide class action — millions of customers are named as the class. The success of the suit could set an important precedent for how courts approach algorithmic pricing practices.
According to Reuters and Bloomberg Law, the plaintiffs have not yet issued a broad public comment. McDonald's, for its part, stated its position once and has not disclosed further details. How the case develops will become clear from subsequent court filings and the parties' official statements — all details known so far are based on the reports of the two outlets cited above.
The parties' official statements have so far been limited: McDonald's confined itself to a brief statement, and the plaintiffs' representatives gave no public comment. That leaves the complaint itself and the two outlets' reports as the primary sources for now. The next stages of the case — class certification, response deadlines and preliminary hearings — will be announced under federal court procedure.
