Valve's Antitrust Reckoning: A Global Wave of Lawsuits Over Steam's 30% Commission and Price Parity

As of June 2026, the CCC had sent a formal liability letter to Valve but had not yet filed a formal lawsuit in court . Valve has not yet responded substantively to the Dutch claims.

The UK Class Action: £656 Million Certified for Trial

The most procedurally advanced case is the UK opt-out collective action, which was filed in June 2024 by digital rights campaigner Vicki Shotbolt and certified to proceed by the Competition Appeal Tribunal on January 26, 2026, following an October 2025 hearing .

The claim seeks £656 million (approximately $898 million) on behalf of an estimated 14 million UK Steam users who purchased games or add-on content since 2018 . The allegations mirror those in the Dutch case: Valve allegedly abused its dominant position by imposing excessive 30% commission fees and enforcing price parity obligations that blocked price competition .

Because the case was certified as an opt-out collective action, all UK consumers who fall within the defined class are automatically included unless they actively choose to opt out . The tribunal's certification ruling means the case will now proceed to a full trial, though no trial date has been set.

The US Cases: From Developer Class Action to an Alleged Microsoft Conspiracy

Wolfire v. Valve: The Foundation

The legal theory underpinning all of these cases traces back to Wolfire Games v. Valve, originally filed in 2021 by the independent game studio. The case was later consolidated as In re Valve Antitrust Litigation and certified as a class action in the U.S. District Court for the Western District of Washington .

The core challenge targets Steam's Most Favored Nation (MFN) clause — known in the industry as a price parity requirement — which prohibits developers from offering better pricing, early access, or exclusive content on competing storefronts . Wolfire argues these contractual terms constitute unlawful maintenance of monopoly power by insulating Steam's 30% commission from competitive pressure. The case entered a critical phase in mid-2025 and remains ongoing with active discovery and class certification proceedings .

The New Microsoft Dimension

A novel and aggressive expansion of the legal theory came in late May 2026, when plaintiffs Max Rockman and Randall Moring filed a proposed class action in the Western District of Washington that names Microsoft as a co-conspirator alongside Valve .

The lawsuit alleges that Microsoft and Valve entered into a 2011 distribution contract containing a price parity clause that prohibited Microsoft from pricing its PC games lower on competing stores than on Steam . Critically, the plaintiffs claim Microsoft received "kickbacks" from Valve in exchange for agreeing not to compete on price — effectively alleging a horizontal price-fixing conspiracy between ostensible competitors .

The complaint asserts this arrangement kept PC game prices artificially high for 15 years and prevented Microsoft from developing its own storefront into a genuine competitor to Steam . The suit is newly filed and remains in its earliest procedural stages.

The Common Thread: Price Parity and the 30% Commission

A single legal theory connects all four cases: Steam's price parity clause and the revenue share it protects. The argument, now deployed in multiple jurisdictions, is that the MFN clause functions as an exclusionary device. By contractually preventing publishers from passing the savings of a lower store commission to consumers, Valve insulates its 30% fee from competitive pressure. The result, plaintiffs in every jurisdiction argue, is that PC game prices are higher than they would be in a competitive market .

The Wolfire case established this theory in US federal court. The UK and Dutch actions extend it to consumer overcharge damages under their respective competition laws. The new US case adds an unprecedented twist: the alleged conspiracy between Valve and Microsoft transforms the theory from one of unilateral exclusionary conduct into a claim of coordinated price-fixing between market players .

Valve denies all allegations of monopoly abuse and has argued that its commission structure is competitive with other digital storefronts . No trial dates have been set in any of the cases.