On June 30, 2026, U.S. Magistrate Judge Susan van Keulen of the Northern District of California
issued a 25-page order in Yelp Inc. v. Google LLC, Case No. 5:24-cv-06101-SVK, granting Yelp
partial summary judgment through issue preclusion, also called collateral estoppel. For businesses that bought Google Ads, the ruling is important because it shows how earlier monopoly findings against Google can carry forward into later private claims and reduce the burden that individual claimants may otherwise face.
The order establishes two facts as binding in Yelp v. Google. General search services in the United States was a relevant antitrust market through August 5, 2024, and Google held monopoly power in that market from 2009 through that date. If the case reaches its scheduled September 2028 trial, the jury will be instructed that these points have already been established. That changes the shape of the case in a practical way. Yelp still must prove the remaining elements of its claim, including causation and damages, but it will not need to prove that Google had monopoly power in general search during the relevant period. For advertisers considering Google Ads arbitration, that distinction matters because a private recovery claim becomes easier to evaluate when part of the antitrust foundation has already been supplied by prior litigation.
What the Court Decided in Yelp v. Google
Issue preclusion is a practical doctrine with substantial consequences. When a party has already litigated an issue and lost, that party may be barred from forcing a later plaintiff to prove the same issue again. The doctrine prevents repeat litigation over matters already decided, while allowing later cases to focus on the facts that remain in dispute.
That is what happened in Yelp v. Google. Yelp relied on findings from United States v. Google, where Judge Amit Mehta ruled in August 2024, in a 276-page opinion after a nine-week bench trial, that Google violated Section 2 of the Sherman Act by maintaining a monopoly in general search.
Judge van Keulen’s order states the point directly. “Yelp has met its burden to show that the GSS monopoly power issue at stake in this litigation is the same in substance as the general search services monopoly power issue decided in U.S. v. Google.” With that statement, the court has taken a major issue off the table. Yelp no longer must prove from the ground up that Google held monopoly power in general search services in the United States through August 5, 2024. Those facts will be treated as established in Yelp’s case, even as Google continues to pursue its appeal of the underlying search ruling.
The Earlier Google Monopoly Preclusion in New York
The Yelp Google antitrust ruling is the second such ruling in eight months. On October 27, 2025, U.S. District Judge P. Kevin Castel of the Southern District of New York, presiding over the consolidated digital advertising cases against Google, gave preclusive effect to an April 2025 ruling by Judge Leonie Brinkema of the Eastern District of Virginia.
Judge Brinkema held that Google violated the Sherman Act by monopolizing the publisher ad server and ad exchange markets. Judge Castel’s ruling favored publishers and advertisers, including advertiser class representatives, and bars Google from relitigating those monopolies and the unlawful tying of its ad server to its ad exchange.
Together, the two rulings establish a useful principle for private Google antitrust claims. When courts have already found that Google monopolized a market, later plaintiffs may be able to use those findings when the same issues arise in their own cases. That principle does not guarantee recovery for any claimant, but it can make later claims more efficient where the prior findings fit the new case.
Why Issue Preclusion Matters in Google Ads Arbitration
Google’s advertising terms for U.S. advertisers typically require individual arbitration. As a result, advertiser recovery claims proceed through Google Ads arbitration in the American Arbitration Association, with thousands of businesses already pursuing individual claims measured by each business’s own advertising spend.
Issue preclusion matters because it can narrow the proof required in a Google Ads arbitration. If a prior court has already found that Google held monopoly power in a relevant market, and the same issue arises in an advertiser’s claim, that finding may allow the case to move more directly to the questions that remain. Those questions typically concern whether the challenged conduct affected the advertiser, whether the advertiser paid an overcharge, and how that overcharge should be measured.
That makes the advertiser’s own records especially important. The materials that help establish a claim include the Google Customer ID, which is the ten digit customer number in the Ads dashboard (Google Id), along with invoices, billing statements, spend and campaign history, and correspondence with Google about pricing or auction behavior. Those documents help show what the business spent, when it spent it, and how its advertising activity fits within the claim period.
Disclaimer: DARC helps businesses evaluate and pursue Google Ads recovery claims. This article is attorney advertising and general information, and it is not legal advice. Eligibility and potential recovery depend on the specific facts of each business’s advertising history.