Olyzon, a French ad tech business which positions itself as an agentic decisioning layer for CTV advertising, has announced the closure of a $10 million Series A funding round led by S4S Ventures, the investment vehicle co-founded by Sir Martin Sorrell and Sanja Partalo. Existing investors from a prior $5 million funding round last year, including private equity firm Eurazeo, also participated.
Olyzon, which launched just two years ago, seeks to tackle that age-old issue of fragmentation in CTV advertising. The company’s pitch to advertisers and agencies is that while the delivery of TV has completed its digital transformation, buy-side decisioning hasn’t. Buyers work across a number of different platforms which use different targeting and measurement frameworks, and insights are often delivered after a campaign has run, limiting in-flight optimisation. Using those insights to shape future campaigns meanwhile is a manual process.
“CTV has scaled fast, as pipes multiplied, formats exploded, and measurement fragmented,” said Jules Minvielle, co-founder and CEO, Olyzon. “The decisioning layer never kept pace. Now, AI agents that can finally reason across the chaos have reached production maturity, and that’s exactly the moment Olyzon was built for.”
The company acts as an agentic layer sitting on top of a buyer’s CTV workflow, connecting up to the various demand-side platforms, supply-side platforms, publishers and measurement vendors they work with. Clients can enter natural language prompts to describe the type of inventory they’re looking for, based on a brief or their target audience. Olyzon’s agents then map out relevant inventory and predict what’s likely to deliver best. Its technology also adapts creative to fit selected inventory, and then pushes decisions through to the buyer’s existing execution technology. Finally, measurement signals are consolidated, fed back through to the advertiser, and then used to shape future campaigns.
The two forces reshaping advertising
S4 Capital, the marketing group where Sorrell sits as executive chairman, operates specifically in the digital arena. The world of traditional linear TV has therefore been outside of his company’s remit.
As streaming continues to grow its share of ad sales though, it’s becoming more and more important for the company. And through S4S Ventures, Sorrell has spearheaded a number of investments in tech companies which are solving major challenges in CTV, including a previous investment in measurement business tvScientific.
“Olyzon sits at the intersection of two forces reshaping our industry: the agentic AI revolution and the consolidation of CTV onto programmatic infrastructure,” said Sorrell. “Their platform doesn’t replace existing DSPs or measurement partners, it orchestrates them with a speed and precision that human teams alone cannot achieve. We are proud to lead this round.”
His S4S Capital co-founder Sanja Partalo meanwhile said that Olyzon is meeting a real buy-side need in the market. “The CTV media buying stack has been missing a true intelligence layer, one that connects planning, activation, and measurement into a single agentic platform,” he said. “Olyzon combines deep trading expertise with a purpose-built agentic architecture to fill that gap. They are delivering measurable results for some of the most demanding agencies and brands in the market.”
Those clients include Pepsico, Danone, McDonald’s, Nissan, Mastercard, and L’Oreal. Olyzon says the funding will be used to further expand its US operations and open a London office, as well as fuelling further product updates.
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