Bret Taylor startup

Bret Taylor’s Sierra Surges to $100M ARR in Just 21 Months

Sierra, the AI startup co-founded by ex-Salesforce co-CEO Bret Taylor and Google veteran Clay Bavor, has hit a major milestone: $100 million in annual recurring revenue (ARR) — and it’s done so in under two years. Rapid Growth That Surprised Even the Founders Launched in February 2024,

Sierra AI funding

Sierra Surges to a $10B Valuation After $350M Funding Boost

Sierra, the AI agent startup led by Bret Taylor and Clay Bavor, just hit a bold new milestone. On September 4, 2025, the company announced a $350 million funding round led by Greenoaks Capital, pushing its valuation to an impressive $10 billion—more than double its valuation just last October.