CompanyAiEnterprise
Sierra
Sierra is a San Francisco AI company building conversational agents that handle customer interactions for enterprises. Founded by Bret Taylor and Clay Bavor in 2023, it serves more than 40% of the Fortune 50 and was last valued at $15.8 billion after a $950M Series E in May 2026.
2023Founded
San FranciscoHQ
$285M (cumulative)Earlier rounds
ai-agentsconversational-aicustomer-experienceenterprise-aibret-taylorclay-bavor