LAST UPDATED: October 2026

For years, premium news publishers have been told they need to compete in the open marketplace, plugging into as many demand networks and resellers as possible to “maximise fill” and “increase eCPM.” But as supply path optimisation (SPO) and auction dynamics become more widely understood, it’s clear that many legacy publishers have been sold a flawed strategy. Outsourcing demand to networks and remnant partners isn’t just inefficient; it actively erodes long-term revenue and devalues inventory in the eyes of the market.

If you’re running a multi-site publishing network, you need control. You need visibility. And you need a strategy that prioritises your long-term financial health over short-term eCPM fluctuations. Let’s break down exactly why that means owning your ad tech ecosystem, not renting it out.

Since I first wrote this article December 2025, two developments have made the case more pertinent. The first is traffic. Chartbeat’s 2026 Publisher Playbook puts the fall in Google Search referrals across its network, which is mostly news and media sites, at 40% year on year to July 2026. Search has dropped from around 9% of all pageviews to 5% in two years, and AI assistants haven’t filled the gap (referrals from them fell through 2026). Fewer impressions means that every one that you hand over to a reseller costs you. More so than it used to.

The second is that in September, a US judge ordered Google to open AdX up to Prebid and rival ad servers, and to share auction data with publishers. We cover what that means further down, but the short version is that it favours publishers who control their own auction.

The Problem with Outsourcing Demand in an Age of Supply Path Optimisation

At first glance, offloading unsold inventory to ad networks or remnant partners sounds like an easy win. You get “guaranteed” fill, another bidder in the auction and theoretically more competition. But the reality is very different.

• Auction integrity breaks down: When you let a reseller sit high in the auction, you’re effectively outsourcing control of your own bidding process. Instead of demand sources competing in a single, unified auction, resellers often rerun their own auctions outside your control. This creates a redundant bidding loop where your most valuable partners are artificially blocked from bidding at market price.
• Your inventory is repackaged and resold: Many networks take impressions that should have been won in your direct auction, sell them to third parties and pocket the margin. This inflates supply chain complexity, reduces transparency and means your impressions might be showing up in buyers’ reports under someone else’s brand.
• The wrong signals are sent to demand partners: Advertisers and DSPs rely on pricing signals to assess inventory quality. When you allow a reseller to sit at a fixed price, you’re distorting market signals, making it appear as though demand is artificially high. Over time, this can reduce bid density and lower competition across your entire stack.
• Artificial fill rates mask the problem: Ad networks love to talk about their “fill rates,” but this metric is often misleading. When a reseller takes an impression, Google Ad Manager counts it as a sale even if the ad never actually serves. The result? Inflated fill rate metrics that make it seem like revenue is stable, when in reality valuable impressions are being wasted on blank ads or low-quality demand.
• Partners count their own homework: Most publisher analytics take each SSP’s reported numbers as the truth. If your only source of truth for a partner’s performance is their own dashboard, I’m afraid you don’t have a source of truth.

What the Google Ruling Changes

For publishers, the changes that matter are these.

• Sites using Google’s ad server will no longer have to use AdX.
• AdX must bid into rival publisher ad servers on the same terms it offers its own.
• Google must connect AdX and its ad server to Prebid.
• Google must share real-time data on winning and losing bids with publishers, and document how its ad server picks auction winners.

Source: https://www.justice.gov/opa/pr/department-justice-again-wins-substantial-relief-against-google

In my view, that’s the same unified auction argument we’ve been making for years and is a major win for the open internet. The catch is that the auction data and the freedom to choose your ad server are only useful to a publisher who controls their own wrapper, ad server and reporting. If a network or managed service runs your stack, you get the benefit only as far as they choose to pass it on.

The Business Case for Keeping Control

If you’re serious about long-term revenue growth, you need to move away from resellers and focus on owning your ad supply chain. Here’s why premium publishers should be doubling down on in-house ad tech.

1. Unified Auctions Mean Higher Real Yields

When all bidders compete in a single, unified auction, market forces dictate pricing. You’re no longer losing high-value impressions to external auctions, and DSPs see a clear, transparent path to your inventory. The result? Higher bid density, more competition and stronger revenue stability.

2. Supply Path Optimisation (SPO) Favours Direct Publishers

Major DSPs and agencies are aggressively cutting unnecessary middlemen to improve efficiency. If your inventory is being resold through multiple layers of exchanges, it’s far less likely to win premium programmatic spend. Supply path optimisation is not just another ad tech buzzword. Advertisers want direct paths to supply, and owning your ad tech puts you in the best position to deliver that.

The next supply path is already being drawn up too. Under the Ad Context Protocol (AdCP), publishers list the AI agents allowed to sell their inventory in an adagents.json file, much as ads.txt lists authorised sellers, and Prebid released an open-source sales agent for it in January. As agentic buying grows, owning your stack will also mean deciding which agents can sell on your behalf.

3. Page Performance and User Experience Improve

In our testing, ad networks had 3x the browser memory usage of publishers running their own controlled auction environments. Why? Because when a reseller operates within your stack, they often run separate auctions within each ad unit, dramatically increasing latency, memory bloat and failed impressions. A streamlined, publisher-controlled ecosystem reduces bloat and improves user experience, core web vitals and ad viewability.

What Premium Publishers Should Do Next

• Audit your current demand mix – How much revenue is actually coming from direct demand vs. resellers?
• Assess the impact of artificial bid floors – Are you blocking legitimate demand in favour of fixed-price resellers?
• Run a controlled test – Compare performance when demand is consolidated within a single auction vs. when resellers are prioritised.

The takeaway? Your ad inventory is a premium product. Treat it like one. The more control you have, the more leverage you hold with advertisers, DSPs and tech partners.

Ready to take control of your ad stack?

Contact us to see how we help publishers like Sinclair Broadcast Group and TalkTalk transition to in-house solutions and audit their programmatic partnerships.