- Lead. US District Judge Leonie Brinkema of the Eastern District of Virginia issued her remedies ruling on September 2, ordering Google to end the specific auction practices identified as instruments of illegal monopoly power — while refusing to force the company to divest its ad exchange, AdX.
- Fact. Under the order, Google must stop giving its own ad exchange first access to publisher inventory before rivals can bid, stop seeing competitor bids before submitting its own, stop imposing uniform price floors across all buyers, and share AdX real-time bid data with rival publisher ad servers.
- Stake. Alphabet handles roughly 55 million ad requests per second and generates around $400 billion in annual advertising revenue; the behavioural changes required by Brinkema’s ruling will restructure auction dynamics for publishers and competing ad-tech firms without dismantling the architecture that underpins Alphabet’s $4.11 trillion market capitalisation.
Judge Leonie Brinkema’s September 2 ruling closes the remedies phase of the US Department of Justice’s ad-technology antitrust case with a result that splits the difference between the government’s maximalist position and Google’s preferred outcome. Brinkema accepted that the auction practices she identified in her April 2025 liability finding constituted illegal monopoly maintenance, and she ordered Google to retool those practices — but she declined the DOJ’s request for a forced divestiture of AdX, the central clearing exchange through which a vast share of the open web’s display advertising flows. Multiple outlets reported that the full judicial opinion would remain sealed for fourteen days to allow both parties to request redactions of trade secrets before publication.
What Must Change
The four core remedies Brinkema accepted are structural in their effect even if not in their form. Google must stop giving AdX first-look access to every publisher impression before competing exchanges can submit bids — a practice that guaranteed Google’s own exchange was never competing on a level playing field. It must stop seeing rival bids before it finalises its own offer, ending an information asymmetry that allowed Google to shade its bids with full knowledge of what competitors were willing to pay. It must stop requiring publishers to set identical price floors across all buying platforms, a constraint that locked publishers into Google’s preferred pricing logic. And it must make AdX’s real-time bid data available to rival publisher ad servers, opening a channel of information that had been exclusively internal. The full opinion, once unsealed, will specify implementation timelines and compliance monitoring.
A Second Consecutive Structural Reprieve
This is the second time in roughly a year that a federal judge has declined to break up Google. In September 2025, US District Judge Amit Mehta rejected a DOJ push to spin off Chrome or force the sale of Google Search’s distribution agreements, instead ordering behavioral remedies including a ban on exclusive default-search deals. The Brinkema ruling follows that same logic: accept the illegal-monopoly finding, impose conduct remedies, but leave the underlying corporate structure intact. Alphabet’s stock surged roughly 45 percent in the year following the Mehta decision, and investors appeared to price Thursday’s ruling similarly — as a confirmation that the courts are not going to engineer a structural break of the company. Google’s record of structuring transactions to pre-empt antitrust exposure has attracted ongoing regulatory scrutiny, and the DOJ’s loss on divestiture may accelerate legislative discussions about whether conduct remedies alone are adequate for platform-era monopolies.
What Publishers and Rivals Get
For web publishers — the parties most directly harmed by the practices Brinkema ruled illegal — the ruling delivers meaningful but incremental relief. The end of first-look, bid-shading and uniform-floor requirements should allow publishers to extract higher prices from a genuinely competitive auction rather than one tilted toward Google’s preferred clearing price. Rival ad-tech platforms will gain access to AdX bid data, potentially enabling them to build better-calibrated competing exchanges. What publishers do not get is the full structural separation that DOJ argued would create lasting competition: AdX remains inside Alphabet, Google’s publisher-side ad server and its buyer-side demand platform remain unified, and the question of whether conduct remedies will be adequately enforced over time remains open.