PubMatic today published its reading of the ad tech remedies ordered against Google, attaching an engineering estimate of roughly a year to 15 months to the interoperability work the court has required.

In Short

A federal court decided that Google will keep its advertising exchange but must rewire how it connects to everyone else, and the chief executive of one of Google's largest independent competitors has now written down what he thinks that order does and does not fix. It matters because those connections govern how banner space on ordinary websites is priced and sold, which is most of the display advertising you see outside apps and walled gardens. Nothing changes this month: Google's own engineers put the build at roughly a year to 15 months, and a court-appointed monitor will decide whether the new connections work on terms comparable to Google's internal ones.

An assessment from a company that is also a plaintiff

Rajeev Goel, co-founder and chief executive of PubMatic, published a post dated September 17, 2026 on the company blog, titled Understanding Google's Ad Tech Remedies: What The Market Should Know. A companion summary went up on his LinkedIn account the same day. The two documents together form the first detailed public assessment of the unsealed remedies opinion from an independent supply-side platform with direct commercial exposure to the outcome.

The framing is careful. According to PubMatic, a federal court has ordered remedies after finding that Google illegally monopolized the ad exchange and publisher ad server markets for open-web display advertising, and the decision is described as a necessary step rather than a conclusion. The question Goel poses in the opening paragraph is practical: whether the requirements will create meaningful choice for publishers and advertisers as they are implemented.

That interest is not disinterested, and the record is public. PubMatic filed its own civil antitrust action against Google in the Eastern District of Virginia on September 8, 2025, alleging that Google's conduct harmed its business and distorted the market. The company is named among the exchanges that private litigation identifies as having lost share and revenue to the practices the court found unlawful. Its assessment of the remedies is therefore the assessment of a party with a damages claim pending on the same facts.

What the order requires on the sell side

The sell-side obligations Goel describes track the package Judge Leonie Brinkema entered on September 2, 2026 and the memorandum opinion that became public on September 16. Google is required to provide real-time AdX bids through Prebid and to rival publisher ad servers, and to separate access to AdX demand from the use of Google's own ad server. Changes to Unified Pricing Rules and greater visibility into auction operation sit alongside those requirements.

Goel's argument for why the Prebid route matters is infrastructural rather than legal. Prebid is an established open-source standard that publishers and exchanges already use to connect, and it provides a common connection across technologies. According to PubMatic, supporting infrastructure publishers already run, rather than requiring a proprietary alternative, could make comparing bids and changing technology easier without unnecessary friction.

Then comes the qualification that carries the weight of the post. "But the existence of a connection does not, by itself, create meaningful choice," the blog states. Four conditions follow. The connection must work on comparable terms. Bids must arrive in time to compete. The information must be usable. And publishers must be able to change technology providers without ending up worse off for having made that choice.

Each of those conditions maps onto a specific technical failure mode that the industry has already lived through. A connection that exists but adds latency drops bids from the auction without anyone refusing to send them. Data that is delivered but not usable satisfies a disclosure requirement while leaving the analytics problem untouched. The opinion itself anticipates this by requiring the integrations to be functionally equivalent, a phrase aimed precisely at the pattern where a rival pathway technically works and technically underperforms.

The order reaches further than the Prebid connection alone. Google must share bid data covering wins and losses with publishers, and must publish technical documentation explaining how DFP selects a winning bid. Publishers have spent years inferring that logic from observed outcomes. The obligations apply worldwide rather than only in the United States, and take effect sixty days after judgment, with a jointly proposed final judgment due by October 2, 2026.

Why the AdWords provision carries the buy-side argument

The second half of the assessment concerns demand. The order bars AdWords from favoring Google-owned ad tech tools when bidding, while permitting bidding differences tied to advertiser value rather than ownership. That distinction is the one Goel singles out as most consequential.

Requiring AdWords to bid on advertiser value rather than Google ownership could open one of the market's largest pools of buy-side demand to competition on the merits of technology and performance, according to PubMatic. The stated logic runs in three directions: advertiser budgets flowing toward the inventory and technology that best deliver their objectives, publishers gaining more control over how inventory is sold as more demand competes for each impression, and independent technology companies gaining more opportunity to compete on product quality.

Goel then withdraws from the projection. "These are potential outcomes, not conclusions," the post states, adding that the order does not address every part of Google's ad tech business and that predicting publisher behavior, auction outcomes or market share shifts would be premature. That caveat is load-bearing, because the omission it gestures at is documented. Display and Video 360 emerged from the opinion without restriction, the court having found an insufficient connection between that platform and the conduct at issue. A demand-side platform competing directly with independent rivals sits outside a decree otherwise built around equal access.

The AdWords provision is also narrower than the Department of Justice asked for. AdWords may no longer bid directly into DFP, is prohibited from favoring Google's own tools, and is restricted in how it uses first-party data to advantage Google infrastructure. Structural relief was refused in full. Plaintiffs had sought divestiture of AdX, open-sourcing of DFP's final auction logic and a contingent divestiture of DFP Remainder, and all three were rejected.

A year to 15 months, and where that number comes from

The most concrete figure in either document appears on LinkedIn rather than the blog. Google's own engineers estimate roughly a year to 15 months to build the interoperability the court ordered, Goel wrote, describing the remedies as real and enforceable while conceding they will not flip a switch overnight.

That estimate sits inside a record of competing timelines. Karen Dunn argued for Google at closing arguments on November 21, 2025 that behavioral relief could be implemented within twelve to eighteen months, while the Department of Justice argued that behavioral remedies would entangle the court in continuing litigation over technical detail. A ruling was expected in January or February 2026. It arrived on September 2. The gap between an order and an operating integration is therefore measured in the same units as the gap between the trial and the ruling.

For planning purposes the arithmetic is unforgiving. Judgment has not yet been entered. Sixty days run from entry. The engineering estimate runs from a starting point that has not formally occurred. Publishers evaluating whether to change ad servers, and exchanges evaluating whether to invest against a more open AdX, are working against a date in late 2027 rather than a date this year.

The monitor, the committee and three questions

Enforcement is the section where Goel is least willing to predict anything. The remedies' impact will depend on implementation, measurement and enforcement, the post states, which makes the independent monitor and the Technical Committee important as products, auction design and market practices evolve. A court-appointed technical monitor serves a six-year term with access to Google's employees, systems and source code. Both the monitor and the committee remain to be selected.

The post reduces the enforcement problem to three questions. Can a publisher choose another ad server without losing access to important demand? Can independent exchanges compete without avoidable technical disadvantages? Can someone outside Google verify that the requirements are working as intended? Their answers, according to PubMatic, will determine whether the order changes the market in practice rather than only on paper.

The third question is the one with no obvious institutional answer. Monitors report to courts. Market participants observe outcomes, not mechanisms, which is the condition that produced years of inferential analytics in the first place. Digital Content Next made a version of the same point on September 2, arguing that the asset at stake was market-wide auction data rather than publisher display revenue alone.

What the independent sell side has riding on this

PubMatic's commercial position gives the assessment its stakes. The company reported second-quarter 2026 revenue of 78.6 million dollars, up 11 percent, ending three consecutive quarters of decline, and announced chief financial officer Steve Pantelick's planned retirement in the same release. Magnite reported 192.8 million dollars in the same quarter. Michael Barrett, Magnite's chief executive, had forecast in July 2026 that the category would consolidate into far fewer companies and that platforms built on inventory arbitrage would struggle.

Against Google's position in the same markets, the scale gap is the argument. The court's April 17, 2025 liability finding put Google at 91 percent of the publisher ad server market. PubMatic executives told investors in May 2025 that Google held roughly 60 percent share against PubMatic's 4 percent on the exchange side, and framed the liability verdict as a long-term tailwind. Sixteen months later, the mechanism for converting that verdict into share is a set of API integrations Google will build, document and operate under observation.

Parallel proceedings continue in Europe on the same conduct. The European Commission fined Google 2.95 billion euros in Case AT.40670 on September 5, 2025, and published the provisional public version of that decision on January 14, 2026, documenting first look, last look, dynamic revenue share, unified pricing rules and Project Poirot. Google filed for annulment on January 12, 2026 in Case T-794/25. Brussels kept structural remedies on the table where Virginia did not, and the two tracks have now diverged on the central question of ownership.

The gap between an order and a market

Goel closes the blog post by describing the decision as an opening whose meaning will depend on implementation, transparency and sustained enforcement, and states that he remains optimistic about a market driven by innovation and the ability to deliver real value to advertisers and publishers.

Stripped of the optimism, the structure of the argument is a warning about enforcement asymmetry. The party required to build the remedy is the party that benefited from its absence, the party best positioned to judge compliance reports to a court rather than to the market, and the measurement of whether rival connections perform equivalently depends on telemetry the same party generates. Behavioral remedies in advertising technology have a history here: Unified Pricing Rules themselves arrived in 2019 as a simplification, and were among the practices on which liability eventually rested. The European Commission concluded in 2025 that behavioral rules had failed on this record, because conduct was repeatedly modified while its effects were preserved.

For media buyers and publishers, the operational consequence of today's documents is limited and specific. No auction behavior changes on the strength of a blog post. What changes is the calendar: a joint final judgment due in early October, an effective date sixty days after entry, an engineering window of roughly a year to 15 months, a six-year supervision period, and a set of four conditions that a sell-side competitor has now put on the public record as its test of whether the connection is real.

Timeline

Summary

Who: Rajeev Goel, co-founder and chief executive of PubMatic (Nasdaq: PUBM), writing about remedies ordered by Judge Leonie M. Brinkema of the United States District Court for the Eastern District of Virginia against Google in United States of America et al. v. Google LLC, Case 1:23-cv-108.

What: A published assessment of the behavioral remedies in the ad tech monopolization case, covering real-time AdX bids through Prebid and to rival publisher ad servers, separation of AdX demand from Google's ad server, changes to Unified Pricing Rules, auction visibility, and the prohibition on AdWords favoring Google-owned tools. The post sets four conditions for the Prebid remedy to count as meaningful choice and three questions for enforcement, and cites an engineering estimate of roughly a year to 15 months to build the ordered interoperability.

When: Published September 17, 2026, one day after the memorandum opinion became public on September 16 and fifteen days after the September 2, 2026 order. A jointly proposed final judgment is due October 2, 2026, with obligations taking effect sixty days after entry and supervision running six years.

Where: The PubMatic company blog and Goel's LinkedIn account, concerning a proceeding in the Eastern District of Virginia at Alexandria, with obligations that apply worldwide rather than only in the United States.

Why: The remedies replace a divestiture with engineering obligations Google will build and operate itself, which makes implementation quality, latency parity and independent verification the variables that determine whether publishers gain real ad server choice and whether independent exchanges gain access to Google demand on comparable terms.