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By September 20, 2024, the U.S. Department of Justice and eight states were nearing the end of their case accusing Google of monopolizing parts of the technology used to buy and sell online display ads. Testimony and internal documents had put the structure of Google’s ad-tech business, its auction practices, and publishers’ ability to switch providers at the center of the dispute. Google denied that it had unlawfully excluded competitors, arguing that the government had defined the market too narrowly and that customers chose its integrated tools because they worked well.
Update: This is a snapshot of the trial at its two-week mark, not its current legal status. On April 17, 2025, Judge Leonie M. Brinkema issued a mixed liability ruling, finding Google liable in parts of the publisher ad-server and ad-exchange markets while rejecting important parts of the government’s broader case. Remedies proceedings followed. The Justice Department’s case page records filings and later developments.
Which Google antitrust case was this?
This was the Justice Department’s digital-advertising technology case, United States et al. v. Google LLC, not the separate case about Google Search defaults and distribution agreements. The DOJ filed the ad-tech complaint on January 24, 2023, joined by attorneys general from eight states. A bench trial—one decided by a judge rather than a jury—began September 9, 2024, in the U.S. District Court for the Eastern District of Virginia, before Judge Leonie M. Brinkema. The plaintiffs alleged monopolization, attempted monopolization, tying, and related violations in digital advertising technology markets. The complaint and case record are available on the DOJ case page.
At the September 20 point captured here, the judge had not decided whether Google violated antitrust law. The government was presenting its case; Google’s defense and the court’s assessment of liability were still ahead.
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How the open-web ad-tech system works
Ad tech is the software and marketplaces that help publishers sell ad space and advertisers buy it, often through automated auctions. A single ad impression can involve several systems in a fraction of a second:
- An advertiser or agency decides what audience and placement to buy, often using an advertiser-side buying tool.
- A publisher’s website makes an ad impression available through its publisher ad server, which manages inventory and can compare demand sources.
- Demand sources submit bids to an exchange or other auction mechanism.
- The auction selects a winning bid, and the publisher’s page displays the ad.
Google offered products at multiple points in this process. Google Ad Manager is its publisher-side suite, historically associated with DoubleClick for Publishers and DoubleClick Ad Exchange; Google Ads and the Google Display Network serve advertiser-side functions. The case was about whether Google’s position across connected layers let it steer transactions or disadvantage rivals—not about a claim that Google controlled every form of advertising or every online ad. The DOJ complaint sets out the government’s account of the relevant markets and alleged conduct.
What the DOJ argued
The government’s central theory was that Google had accumulated power across publisher ad servers, ad exchanges, and advertiser-facing tools, then used practices linking those products to protect its position. Those were allegations for the judge to evaluate, not findings established by September 20, 2024.
Acquisitions that expanded Google’s position
The DOJ focused on Google’s 2008 acquisition of DoubleClick, which included a major publisher ad-serving business and an ad exchange, and its later acquisition of AdMeld, a company in publisher-side yield management and exchange services. The government argued that these deals added important products and publisher relationships to Google’s stack. Historical emails and presentations were offered as evidence of how executives assessed the acquisitions’ competitive significance. The fact that an acquisition was strategically important, however, did not by itself establish that it was unlawful; the judge had to assess the legal claims and the evidence as a whole. The DOJ trial-exhibits page lists the government’s admitted and offered materials.
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Alleged steering and barriers to competition
Government lawyers said Google’s auction rules, access policies, pricing mechanisms, and product integration helped its own exchange and tools compete at the expense of alternatives. They also argued that publishers and advertisers could face substantial practical costs in moving to other providers, even when rival products were technically available. In the government’s account, scale and connections across the stack could make a nominal choice less meaningful in day-to-day business.
The DOJ further alleged that Google collected fees at multiple points in some transactions and that its conduct reduced competition and publisher revenue. Those propositions depended on the market definition, evidence about how auctions operated, and proof of competitive effects—not merely on the fact that Google had several products in the process. The government sought structural relief that could require divestiture of parts of the ad-tech business; that was not a proposal to break up all of Google. The requested relief is described in the case materials.
What the evidence had shown by the two-week mark
The emerging record had three strands: company documents, testimony from publishers and ad-tech firms, and disputes over the operation of auctions. Each strand addressed a different part of the government’s theory, and none alone answered the legal question.
Internal documents and strategy
The DOJ used internal correspondence and presentations to argue that Google understood the strategic value of being present at multiple stages of ad buying and selling. One widely discussed example was a 2009 email attributed to former Google display-advertising executive David Rosenblatt, which compared control of the advertising market to owning both an investment bank and a stock exchange. The government presented material of this kind as evidence about the company’s view of the competitive landscape and the acquisitions’ significance.
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Such language could inform the court’s understanding of strategy, but an executive’s metaphor was not itself proof of monopoly power or unlawful exclusion. Its weight depended on context, implementation, and how it related to the alleged conduct. The exhibits can be reviewed through the DOJ trial record; contemporaneous coverage of the first two weeks is in Computerworld’s September 20 account.
Publisher and rival testimony
Publishers described reliance on Google’s tools, concerns about fees and auction control, and the difficulty they saw in switching away. Rival ad-tech firms, including companies such as Index Exchange, The Trade Desk, and Scope3, addressed competition, access to auctions, and the practical conditions for operating alongside Google. News Corp. and Gannett were among the media companies whose experience was part of the trial coverage.
That testimony mattered because it spoke to real operating conditions, not only product descriptions. But a publisher’s account of dependence or dissatisfaction was evidence of that organization’s experience; it did not automatically prove that all publishers lacked alternatives or that a legal violation occurred. Publishers also differ: a small site with limited technical staff may have fewer practical options than a large media company with in-house ad-sales and engineering teams. The Associated Press’s trial coverage reported on the evidence dispute.
Auction mechanics and the legal dispute
The government’s theory depended in part on how decisions were made as a bid moved through the ad server, demand sources, and exchange. If one company supplied or controlled several connected components, the DOJ argued, it could influence which bids competed and how rival products reached publisher inventory. Google disputed that picture and emphasized the role of alternatives and customer choice.
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This was not simply a case about whether one fee percentage was high or low. The court had to consider which specific technology markets were relevant, whether Google had durable market power in them, what its practices did to competition, and whether those practices had a legitimate business explanation. A figure attributed to a particular transaction path or market cannot be treated as a universal take from every advertising dollar.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How Google responded
Google’s defense challenged both the government’s market boundaries and its interpretation of the company’s products and conduct. The company argued that the DOJ carved out a narrow slice of a much broader, multi-sided advertising ecosystem that includes publishers, advertisers, agencies, exchanges, and platforms.
- Market definition: Google said the government’s focus on particular open-web display-ad tools left out competing ways to reach audiences and buy advertising.
- Competition and choice: It pointed to large companies and specialist firms as alternatives, and argued that customers could use multiple providers rather than being locked into Google.
- Integration and interoperability: Google maintained that connected tools could reduce cost and complexity, work with rival systems, and be chosen because they were effective, affordable, and secure.
- Growth and performance: The company argued that expansion in digital advertising reflected growing demand and product utility, not unlawful exclusion.
Those are Google’s advocacy positions, not neutral findings. Its September 2024 trial materials and summary of its arguments present its account. The core factual dispute was whether the combination of scale, integration, switching costs, and auction design amounted to effective competition—or made rivals and customers less able to constrain Google.
Why the case mattered beyond Google
For publishers, the outcome could affect how they manage inventory, compare bids, and retain revenue from advertising placed on their sites. For advertisers and agencies, the questions included access to demand, the efficiency and transparency of auctions, and the costs of using different tools. For competing ad-tech firms, the dispute concerned whether they could reach enough publisher inventory and compete on fair terms.
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The stakes also extended to the open web’s business model: many websites rely on advertising to fund reporting, services, or other content. A ruling or remedy could influence the structure of ad transactions and the tools available to publishers and buyers. Those effects were possibilities, not guaranteed consequences, and would depend on the court’s findings and any remedies imposed.
What remained unresolved on September 20, 2024
At the two-week mark, Google’s defense, further testimony, expert evidence, closing arguments, and the judge’s liability decision remained ahead. Because this was a bench trial, Judge Brinkema—not a jury—would decide whether the plaintiffs proved their claims. Remedies would follow only if liability were established. The case timeline and subsequent filings are maintained on the DOJ case page.
What happened after the trial snapshot
Judge Brinkema issued a mixed liability ruling on April 17, 2025. The court found Google liable for monopolization in parts of the publisher ad-server and ad-exchange markets, while rejecting important portions of the broader government case, including its advertiser-ad-network theory and its challenges to the DoubleClick and AdMeld acquisitions as presented in the final ruling. A separate remedies phase followed. The later ruling does not change what was known at the trial’s two-week point: on September 20, 2024, liability had not yet been decided. The official case record provides the litigation timeline.
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