Led by a16z, Exa closes $250M Series C funding round; company now valued at $2.2 billion

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Exa Labs, a startup building search infrastructure tailored for AI Agents, announced on May 20 that it had closed a $250 million Series C funding round led by a16z. The company’s post-money valuation now stands at $2.2 billion — more than tripling from its $700 million valuation during its $85 million Series B round last fall, just eight months prior. Founded by William Bryk and Jeff Wang in a Harvard dorm room, the company was formerly known as Metaphor Systems. It specializes in creating search engines designed specifically for AI Agents rather than ordinary users, owning a fully proprietary search technology stack. At the time of the funding announcement, Exa boasted over 5,000 enterprise clients, including well-known AI products such as Cursor, Cognition, and OpenRouter, plus more than 500,000 developers. Usage of tokens for agent-driven queries surged 20-fold year-on-year. Its flagship tool, Exa Instant, delivers results in just 180 milliseconds; its custom vector database can retrieve billions of embeddings in 0.1 seconds while returning 90% fewer text results than competitors — all with virtually no loss in RAG quality. Sarah Wang, partner at a16z, stated in the announcement, “This year, the number of web searches conducted by Agents will surpass those done by humans, and this gap will soon widen dramatically.” She believes Exa is poised to become the default search infrastructure layer in the AI era. Both Y Combinator and Nvidia participated in previous funding rounds.

Bloomberg | SiliconAngle

Exa Labs raises $250M at $2.2B valuation for its AI search tools - SiliconANGLE