Sierra raises $950M Series C at $15B valuation for enterprise AI
Original: Sierra raises $950M as the race to own enterprise AI gets serious
Why This Matters
Demonstrates massive enterprise demand and investment appetite for AI agents
AI startup Sierra raised $950M Series C led by Tiger Global and GV, valuing the company above $15B. Founded by Bret Taylor, Sierra serves 40% of Fortune 50 companies and hit $150M ARR in February 2026.
Sierra, the AI startup founded by former Salesforce co-CEO and OpenAI chairman Bret Taylor, announced a $950 million Series C funding round led by Tiger Global and GV, pushing its valuation above $15 billion. The company claims to serve more than 40% of Fortune 50 companies with AI agents handling billions of interactions including mortgage refinancing and insurance claims. Sierra reported rapid revenue growth from $100 million ARR in November 2025 to $150 million in February 2026. The company recently launched Ghostwriter, an 'agent as a service' tool that creates specialized agents based on natural language descriptions. Enterprise adoption shows mixed results - Uber's CTO noted they 'blew through their AI budget' but achieved 10% autonomous code generation across 8,000 technical workers.