Sierra Technologies Nears $350 Million Funding Round

Sep 4, 2025
Sierra Technologies Inc., an AI startup, is close to securing $350 million in funding, valuing the company at $10 billion. The round is led by Greenoaks Capital.

Sierra Technologies Inc., an AI startup specializing in custom AI agents for enterprise customer service, is nearing the completion of a $350 million funding round. This investment is expected to value the company at $10 billion.

The funding round is led by Greenoaks Capital, which also led Sierra's previous $175 million round at a $4.5 billion valuation. Founded in 2023 by Bret Taylor, former co-CEO of Salesforce and current OpenAI chair, and Clay Bavor, a former Google executive, Sierra has quickly gained traction in the AI industry.

Sierra's platform offers a software toolkit, known as Agent SDK, which allows companies to create AI agents with features like web search and customer support processing. The company also provides Agent Studio, enabling business users to customize agents without coding.

Sierra is on track to exceed $100 million in enterprise annual recurring revenue, with a customer base that includes numerous large enterprises. The company reports that 15% of its clients generate over $10 billion in annual revenue, while about half have revenues exceeding $1 billion.

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