Sierra is a San Francisco-based enterprise AI company founded in 2023 by Bret Taylor, former co-CEO of Salesforce and chairman of OpenAI's board, along with Clay Bavor, former Google executive. The company builds AI agent platforms for customer service and customer experience, allowing enterprises to deploy conversational AI agents that can handle complex customer interactions across support, sales, and account management functions.
Sierra closed a $950 million Series E funding round in May 2026, led by Tiger Global and Google's venture arm GV, valuing the company at $15.8 billion, up from a $10 billion valuation in late 2025. The company has reported rapid revenue growth, crossing $150 million in annualized recurring revenue in early 2026, as enterprise demand for AI customer agents has accelerated across retail, telecommunications, and financial services customers.