Supply-Side Platform (SSP) for Publishers · Vendor file
Magnite
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Largest independent SSP formed from Rubicon and Telaria merger; CTV-strong
Active · verified September 2026
Categories Magnite serves
The B4 Index places Magnite in 2 categories. Each category page lays out the build-versus-buy considerations for that decision.
Supply-Side Platform (SSP) for Publishers Primary Revenue share / take rate (~10-20% of media transacted), enterprise contracts
Publisher Ad Server & Yield Management (SSP/Monetization) Take rate (~5-20% of transaction)
The B4 Index scores every software category on two axes, strategic differentiation and AI feasibility, to
classify it Build, Buy, Bridge, or Beware. Vendor facts here are independent of that call. See the full
methodology.