If you want to know where the independent sell-side is heading, read the SSP earnings. The two biggest independent supply-side platforms — PubMatic and Magnite — both reported Q1 2026 results that point the same direction: CTV is the growth engine, and AI agents are moving from pitch to product. For publishers, the health and strategy of these companies is your leverage against the giants’ captive exchanges.
The numbers in this piece
01The numbers
- PubMatic posted Q1 2026 revenue of about $62.4 million with roughly $2.5 million in adjusted EBITDA — beating its own guidance ($58–60M revenue). Its self-described AI capabilities are accelerating, with 20+ agents embedded across the platform and “fully autonomous campaigns scaling globally.” Its emerging revenues grew 80%+ year over year, reaching ~14% of total revenue.
- Magnite reported Q1 2026 revenue of $164.4 million (up 6% YoY), with Contribution ex-TAC of $160.9 million (up 10%). The headline was CTV: Contribution ex-TAC from CTV hit $82.3 million, up 30% YoY — now the majority of its ex-TAC contribution.
Skeptics note PubMatic’s AI narrative is running ahead of its top-line growth, so read the agent story with appropriate caution. But the direction is unmistakable.
02Why this matters
| The independent sell-side is real, growing, and CTV-led | With Disney consolidating under DRAX and Netflix building its own stack (see our companion pieces), the independent SSPs are the counterweight that keeps non-giant publishers — and especially their CTV and video inventory — competitive and sellable at scale. |
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| Your SSP is becoming an AI-agent platform | PubMatic embedding 20+ agents and running "autonomous campaigns" means the agentic shift isn't just on the buy side or in standards documents — it's already inside the pipes your inventory flows through. Understand what those agents optimize for, because it shapes your yield. |
| CTV growth is where the money is | Magnite's 30% CTV jump confirms where premium spend is going. Publishers with quality video/CTV inventory have a growing, well-capitalized set of independent partners eager to monetize it. |
The independent SSPs are growing on the back of CTV and betting their futures on AI agents — the same two forces reshaping the entire market this week.
03What publishers should do
04What marketers should do
05The bottom line
The independent SSPs are growing on the back of CTV and betting their futures on AI agents — the same two forces reshaping the entire market this week. For publishers, that’s mostly good news: a healthy, innovating independent sell-side is your best hedge against a world of giant-owned, captive exchanges. Just keep the agents accountable to the only number that matters — what lands in your account after everyone takes their cut.