Convicted Monopolist, Intact Business

The monopoly finding is real. The consequence is not.

In April 2025, Judge Leonie Brinkema ruled that Google holds illegal monopolies on publisher ad servers and ad exchanges, and unlawfully locked publishers on its ad server into using its AdX. Yesterday, the same judge ruled that Google does not have to sell any of it. Brinkema rejected the DOJ's proposed remedy that Google divest its sell-side AdX exchange and its DFP ad server, bundled into one product, Google Ad Manager.

That is not a partial victory for the government. That is conviction without structural consequence.

The Pattern Is Now Three Cases Deep

This is not one-off. A federal judge last year refused to force the sale of Google's Chrome browser in a separate monopoly case over online search. Another judge decided against government lawyers in a suit concerning Meta's social media empire. Three cases. Three intact companies.

That is not a tie. That is a pattern.

The market read it correctly. Since the search monopoly remedies decision came down, Alphabet's stock price has surged 45%, creating an additional $1.3 trillion in shareholder wealth. Investors understood the ceiling before most operators did.

Translation: Google kept the exchange that charges publishers a 20% fee per auction, the ad server those publishers are locked into, and the buy-side demand that completes the vertical. The tools staying together is the whole point.

What Behavioral Remedies Actually Mean

Brinkema accepted "most" of the DOJ's previously proposed behavioral remedies. Google promised to make real-time bid amounts for open web display ads sold through AdX available to rival ad servers, agreed to deprecate its Unified Pricing Rules, and said it will not use "first look" and "last look" privileges to adjust its bids. According to Google, it stopped doing so years ago.

That last clause is doing a lot of work. Google is agreeing to stop doing things it claims it already stopped doing.

Behavioral remedies work when the regulated party fears enforcement. DOJ lawyers warned Brinkema in court documents that if Google holds on to all its ad technology, the company will still find ways to "manipulate computer algorithms that are the engine of its monopolies in ways too difficult to detect." The judge heard that argument and chose behavioral restrictions anyway.

Google must make its ad tech tools work with rivals' tools, meant to loosen its grip without dismantling it. Interoperability requirements are meaningful. They are also the kind of thing that gets litigated at the implementation level for years, with compliance teams writing definitions of "works with" that are technically true and operationally meaningless.

The specific behavioral requirements Brinkema imposed remain undisclosed, with a fuller, redacted version of her decision expected later. You are being asked to price a competitive market restructuring whose actual terms you cannot read yet.

What You Need to Revise Today

If you are a publisher, your negotiating posture against Google Ad Manager just changed permanently. The thesis that a forced AdX divestiture would create an independent exchange you could route around Google — gone.

"What is a web publisher to do if it wants to use a different ad server but still get Google's buy-side demand?" asked Jay Friedman, CartographAI co-founder and former Goodway Group CEO who testified as a DOJ witness. That question now has a permanent answer: nothing structural forces Google's hand.

If you are an ad-tech competitor, the consolidation window you priced into your 2027 models closes today. The counsel of permanent incumbency is reasonable. It is also final.

If your operating plan assumed Google's ad-tech division would exist as a standalone company, revise it now. Not next quarter.

What to Watch

Brinkema rejected the divestiture of AdX, the open-sourcing of DFP's final auction logic, and the contingent divestiture of DFP Remainder. Both parties have 30 days to write a jointly proposed final judgment. That window is the first real signal.

Watch what Google agrees to put in writing versus what gets contested. Watch whether the DOJ appeals—and whether any appeals court has appetite to order what two district judges declined to order. Watch whether this outcome changes how regulators frame the Microsoft-OpenAI integration, where the structural-versus-behavioral debate is just beginning.

The ad-tech case is the reference ruling now. Courts have told the government twice what the ceiling is.