For a marketplace like Artmajeur, the question isn't one or many SSPs, it's which few SSPs actually move the needle. When we ran a long list of SSPs, we saw classic problems: duplicate bid requests, noisy logs, and CPMs that looked higher but did not lift net revenue once fees were mapped. After we ran a simple SPO audit and cut to three strong partners, our reporting got cleaner, and page latency dropped without hurting fill. In 2026, I think most publishers still need multiple SSPs, but use them like specialist tools, not a big address book one for unique demand, one for tech and tooling strength, and one as a strategic backup. The winning stack is small, transparent, and easy for your AdOps team to explain in one slide.
In B2B niches like construction tools, our audience is small but high-value. That changes how I look at publishers and their SSP setups. If a publisher is leaning on a long list of SSPs just to push volume, I worry about where my ads actually run. When they show me a slimmer, well-managed stack, with clear packages for trade and pro audiences, I know they've done their homework. By 2026, the sweet spot for most publishers, in my view, will be: Enough SSPs to reach diverse demand and formats. Not so many that reporting and brand safety become guesswork. Documented SPO / DPO work that they can explain in plain language. A plan for CTV, video, and attention metrics, not just banners. For brands like mine, multiple SSPs are fine as long as they serve clarity, not chaos.