Observed Signal · Aug 18, 2026 · Legal Action · Source: AdExchanger · Impact: 4/5 · Sentiment: Negative
Keller Postman Targets Google with Mass Arbitration
Keller Postman, a plaintiffs' law firm, is running a large mass-arbitration campaign against Google’s advertising business, alleging roughly $218 billion in advertiser overpayments. The firm began filing arbitration demands in April and says it has already submitted thousands of claims and expects the total to reach the tens of thousands. The article describes mass arbitration as thousands of coordinated individual arbitration demands (distinct from class actions) and notes the firm's prior campaign against Amazon (more than 75,000 arbitration demands over Alexa). It also references two separate federal judges finding Google guilty of antitrust violations related to search/search advertising and publisher ad server/ad exchange markets.
Large-scale mass arbitration against Google by a known plaintiffs' firm, together with prior federal antitrust findings, could create significant legal liability and operational disruption for Google's ad business and affect market dynamics for advertisers and ad tech.
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Key Takeaways & Evidence Grounding
- Keller Postman began filing arbitration demands against Google in April alleging roughly $218 billion in advertiser overpayments.
- Keller Postman says it has filed thousands of arbitration demands on behalf of Google advertisers and expects the total to reach the tens of thousands.
- Keller Postman previously filed more than 75,000 arbitration demands against Amazon over Alexa allegedly recording private conversations without consent.
- Two separate federal judges have found Google guilty of operating illegal monopolies: one concerning search and search advertising, and another concerning the publisher ad server and ad exchange markets for display.
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Law Firm Launches Mass Arbitrations Targeting Google Advertisers
Chicago law firm Keller Postman, led by Partner and Co‑Founder Ashley Keller, announced a wave of mass arbitration lawsuits against Google seeking recovery for alleged advertiser overpayments tied to the company's monopolistic conduct over the past decade. The firm says it already represents thousands of companies and estimates the total pool of potential damages at roughly $250 billion. The arbitration strategy relies on prior U.S. judges' rulings against Google Search and Google’s sell‑side display ad tech, and uses mass, online recruitment to enroll many advertisers — including large brands — while avoiding public class‑action visibility. Keller argues arbitration lets advertisers pursue damages anonymously without jeopardizing commercial relationships; the firm warns that any retaliation by Google could trigger additional legal exposure.
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