Sierra AI Raises $950M at $15B Valuation — Bret Taylor's Enterprise Agent Bet Keeps Paying Off
Bret Taylor's enterprise AI agent company closed a $950M round at a $15B valuation just eight months after its prior $350M raise, with $150M ARR and 40%+ of the Fortune 50 already on the platform.
Bret Taylor’s bet on enterprise AI agents is compounding fast. Sierra closed a $950M funding round at a $15B post-money valuation — a 50% step-up from the $10B valuation set in September 2025 after a $350M raise. Eight months. Same company. Half a trillion dollars in paper value added.
The round was led by Tiger Global and GV (Google Ventures), with Benchmark, Sequoia, and Greenoaks participating.
The numbers that justify the valuation
Sierra reported $150M in annualized recurring revenue as of early February 2026, up from $100M in November 2025. That is $50M in ARR added in roughly 90 days — a growth rate that most enterprise SaaS companies hit on a good year, not a good quarter.
More than 40% of the Fortune 50 are customers. At $15B, the implied multiple on ARR is 100x — aggressive even by 2025-2026 AI standards, but not irrational given the trajectory.
What Sierra actually sells
Sierra builds conversational AI agents for enterprise customer-facing workflows: mortgage refinancing, insurance claims processing, customer service at scale. These are not chatbots bolted onto existing systems. They are purpose-built agents that handle full transaction lifecycles autonomously — billions of customer interactions, according to Sierra’s own figures.
The company was founded by Bret Taylor, who served as Salesforce Co-CEO and was briefly Twitter’s board chair during the Elon Musk acquisition, and Clay Bavor, who led Google Labs and its XR projects. Taylor brings enterprise CRM distribution instincts; Bavor brings experience building AI-first products at Google scale.
The enterprise agent race
Sierra’s raise lands in a crowded field. Salesforce’s Agentforce, Microsoft Copilot agents, and ServiceNow AI all compete for the same enterprise workflow automation budget. The difference Sierra argues: it is a neutral platform — no legacy software to protect, no cross-sell to manage.
The counterargument is obvious. Salesforce has CRM lock-in. Microsoft has Azure, Teams, and Office365 already inside every Fortune 50 IT environment. Sierra needs to win on agent quality alone, which is harder to defend long-term as foundational models commoditize.
For now, 40% of the Fortune 50 at $150M ARR says the market is buying Taylor’s pitch. At $15B, investors are betting that number reaches $1B+ before anyone catches up.
The enterprise AI agent race is not slowing down. It is getting expensive fast.