French publishing group Reworld Media has handed exclusive control of its open auction programmatic monetization to a third party, a first in Europe. The vendor is ad tech company Sparteo. Its Actirise display and Viously video products were rolled out across all of the group's sites, about 60 in total, late last year. Reworld Media's ad sales team will keep selling direct deals to media agencies and advertisers.
Small and midsize publishers routinely outsource monetization. Some hand it to Google, others to specialized vendors such as Pubstack, Hubvisor, Opti Digital, Moneytizer and Sparteo. No publisher of this size had done it before.
Reworld Media runs close to 80 media brands and about 60 sites. That makes it one of the biggest audience generators on the French web. It is also a programmatic heavyweight, with a large share of its revenue coming from open auction. Only French magazine publisher Prisma Media, the other giant of France's open web, can really challenge it on that front.
The two were regularly cited as the most advanced ad sales operations in programmatic, whether for rolling out new ad formats or new ways of selling inventory. Both also packaged that expertise for other publishers. Each launched an ad sales offering to help them with header bidding, SSP connections, compliance and yield optimization.
That makes Reworld Media's decision a surprise. But it wasn't a snap call, said Grégoire Gaffié, the group's director of monetization and audience. "We've worked with Sparteo since 2020. We know their expertise well, and over the past two years we tested several ad setups in parallel before choosing Sparteo," Gaffié told Open Garden.
The move should let Reworld Media focus on its core business: producing content and growing audiences, Gaffié said. That's no small job. Open web publishers are losing traffic to AI assistants and "zero click" search on Google. Traffic from Google Discover, long seen as a last lifeline, has collapsed.
"We were one of the few publishers in the sector to see audiences grow in the fourth quarter of 2025," Gaffié said. "I think the decision to focus on that had something to do with it." Handing the technical side of monetization to a specialist also frees his teams for other growth levers. Those range from audience acquisition to new revenue sources such as generative engine optimization (GEO).
An ad revenue specialist adds more value by working with editorial teams than by going to every SSP on the market to optimize connections, said Benjamin Tolman, a co-founder of Sparteo. The point is to steer them "toward the topics that generate the most revenue – not necessarily the most audience."
Many tier-one sites in Europe have reached the same conclusion, Tolman said. They are contacting Sparteo to deploy its one-stop shop: Viously for video, Actirise for programmatic display, fastCMP for consent management and Voxeus for audio.
"We help them optimize their programmatic setup, of course, with our proprietary algorithms and our many SSP connections. But we also give them an analytics layer with real-time data on their main monetization KPIs," Tolman said. Those include revenue per article, time spent per user, scroll depth and the impact of certain keywords on brand safety.
Sparteo gets paid by taking a percentage of the CPMs generated. Publishers see an average uplift of about 30% over their previous stack, the company says. "Above all, they give themselves the means to go after an extra 30% to 100% on their own, since their teams now spend more time working with the newsrooms," Tolman said.
"We can work hand in hand with site managers on site UX and page templates, on building new ad formats and on designing commercial offers for the ad sales teams," Gaffié said.
