GDPR has fundamentally changed the economics of programmatic in Europe, and the data backs this up. Ad server Smart estimates that CPMs on inventory with a valid consent string are five to seven times higher than on inventory without one (via Digiday). In September 2025, France’s CNIL fined Google €325 million for making cookie consent withdrawal intentionally harder than accepting - the violation affected 74 million accounts. And when sites offer a “Reject all” button alongside “Accept,” 50-70% of users decline (CookieYes, 2026).
The result: advertisers who continue building programmatic strategy around third-party data face both a shrinking inventory pool and real regulatory risk. The volume of “clean” - meaning consented - inventory is limited, and that scarcity pushes CPMs up precisely where it’s safe to operate.
This article covers how programmatic works in Europe in 2026, which DSPs are relevant, what replaces audience targeting, and whether the channel makes sense for a 15-50 person B2B company.
What programmatic is and why it’s not just “banner advertising”
Programmatic is the automated purchase of ad impressions through a real-time auction. When a user opens a page, an auction runs in a fraction of a second and the highest bidder’s ad is shown. You don’t buy placements in advance - you buy specific impressions to specific audiences.
The ecosystem has several layers: DSP (demand-side platform) on the advertiser’s side, SSP (supply-side platform) on the publisher’s side, an ad exchange as the auction marketplace between them, and a DMP (data management platform) as the audience data repository.
Before GDPR, the whole system ran on third-party cookies: user behavior was tracked across the entire web, detailed profiles were built, and targeting was precise. After the GDPR of 2018 and its ongoing tightening in Europe, that model began to break down. For a practical look at tracking user behavior in the EU without third-party cookies, see the separate guide.
What GDPR did to programmatic in the EU
Three major changes that are still being felt:
Consent requirements. Behavioral targeting requires explicit user consent. IAB Europe proposed the Transparency and Consent Framework (TCF), but regulators in Belgium and the Netherlands found it violated GDPR. As a result, consent rates in the EU are low - by various estimates, twenty to forty-five percent of users consent to full tracking.
Cross-site tracking under pressure. Safari blocked third-party cookies in 2017. Firefox followed later. Chrome retains them, but under regulatory pressure. In Europe, cookies without consent are a violation.
Fines are real. Google received €150 million from the French regulator for an inconvenient consent withdrawal form. Meta received billion-euro fines from the Irish DPC. Advertisers who work with non-GDPR-compliant data also face risk.
This isn’t theory. If you’re running a programmatic campaign in Europe via a DSP with third-party data and no proper consent, you’re in a legal grey zone.
Which DSPs are relevant for European B2B
DSP choice depends on your goals and readiness for compliance.
The Trade Desk - the largest independent DSP, actively investing in privacy-first solutions (Unified ID 2.0, OpenPath). Works well with contextual targeting. Minimum budget for direct access is from €25-50k; for smaller teams, accessible through agencies.
DV360 (Google Display & Video 360) - deep integration with the Google ecosystem. Google audiences (in-market, affinity) partially work without third-party cookies. GDPR compliance through Google Consent Mode. Accessible through agencies or with budgets above €10-15k.
Xandr (Microsoft) - formerly AppNexus, now part of Microsoft. Interesting for B2B through integration with LinkedIn Professional Identity Data - one of the few programmatic providers with legal B2B targeting by professional data in the EU.
Adform - a European DSP with strong coverage of DACH, Nordics, CEE. Strong GDPR compliance position, built-in consent management. Often chosen by companies that care about European data jurisdiction.
What works instead of audience targeting
With the degradation of third-party data, three approaches have come to the fore:
Contextual targeting. Showing ads alongside relevant content, not to specific users. No cookies, no GDPR issues. Technologically this has become smarter: semantic analysis, brand safety, context matching at the paragraph level rather than the site level. For B2B this works through targeting industry media, professional publications, thematic sections.
First-party data activation. Your own data (CRM, email subscribers, site visitors with consent) is uploaded to a DSP and used for targeting or look-alike. In the EU this works when the data was collected with consent and the transfer to a DSP is documented in the privacy policy.
Publisher direct deals. Direct contracts with specific media - minus the auction automation, plus transparency and no consent issues. For B2B in the EU this might be a trade publication or a professional platform with an authenticated audience.
Is programmatic worth it for a 15-50 person B2B company?
Honest answer: often no, at least not as a primary channel.
Programmatic requires a budget of at least €5-10k per month to gather meaningful data. Entry threshold for decent DSPs is through agencies or above that budget level. Training cycle is several months. Attribution is complex, and ROI in B2B with a long deal cycle is difficult to calculate.
Where programmatic makes sense for smaller B2B companies:
Retargeting consented site visitors - small volume, high relevance, relatively cheap through Google Ads or Meta.
Account-based programmatic - targeting a list of specific companies via Xandr/LinkedIn integration or specialized ABM platforms. Combines ABM logic with programmatic inventory.
Brand awareness in a specific region or vertical when launching into a new market - contextual targeting via industry media, no personal data.
Practical takeaway
If you’re planning programmatic in Europe in 2026: start with a consent audit on your site, understand what data you can legally activate. Contextual targeting and first-party activation are more sustainable approaches than trying to preserve the third-party cookie logic through workarounds.
And count honestly: if your total digital budget is €10k per month, programmatic is probably not your priority.