pubX has raised a $5 million Series A and acquired media quality and governance company Compliant. Chicago Ventures led the round. Terms of the acquisition were not disclosed.
Compliant will keep its name and operate as a pubX company, with CEO Jamie Barnard staying at the helm. Within pubX, Barnard takes the role of President, Global Demand Growth, leading the company’s global growth strategy across agencies, advertisers and the wider buy-side.
The deal joins two companies that approached the market from opposite directions. pubX began on the publisher side, spending years helping publishers price and sell their inventory. Compliant, founded by former Unilever and P&G executives, has focused principally on the demand side, delivering measurable value to global brands and their agencies. According to pubX, experience on both sides of the market shaped its vision: infrastructure designed from the ground up for agents to buy and sell directly.
Built on the open Ad Context Protocol (AdCP), the platform works for buyers and sellers alike. pubX says its buyer and seller agents plan, buy, sell and optimise advertising, working directly with one another from brief to reporting across every channel, so that more of every dollar reaches the media and the publisher behind it.
pubX says it was built on the premise that no one hands a media budget to a system they don’t trust, so trust, transparency and accountability are built into the infrastructure on both sides of every transaction. Its agents are educated by pubX, with governance checks on every buy and decisions that are reasoned, traced and auditable. Compliant’s quality signals shape what the agents consider.
The agents are guided by the client, working from the brand’s own brief, plan, publishers and commercial rules. Humans remain in control: the client sets the level of autonomy and approves the plan at key stages, while the agents execute inside those rules. As trust is earned, autonomy grows.
Andrew Mole, CEO and co-founder of pubX, framed agents as the next step in a longer arc. “Programmatic took this industry from fax machines and spreadsheets into more automated and real-time platforms in two short decades, and everything we’ve done since builds on that premise,” he said. “Agents let us finish what was started. You tell them how you buy, you sign off where it matters, and every page of the brief gets read every single time. For the first time, the infrastructure has caught up with what brands want to achieve with their advertising and how publishers want to sell.”
Barnard said the acquisition puts Compliant’s work directly into the buying decision. Compliant built its Data Integrity and CTV Quality Indexes to help brands find high-quality inventory with real, engaged audiences. “Inside pubX, those media quality and governance signals sit in the decision itself, so an agent weighs them before it buys,” Barnard said. “This is what gives each CMO the confidence to trust pubX’s agents.”
Stuart Larkins, Co-founder and General Partner at Chicago Ventures, argued that most industry answers to agentic advertising are an agentic layer built on existing infrastructure. Mole and pubX CTO and co-founder Alex Rosen, he said, have built advertising infrastructure before, and this time built it for agents from the start, on both sides of the transaction. “That is a rare starting position, and the Compliant acquisition makes it stronger,” Larkins said.
The funding will support pubX’s expansion in the United States, the build-out of its demand-side business serving brands and agencies, continued development of its buyer and seller agents on AdCP, and the integration of Compliant’s signals across the platform.
