Sierra raises $950M at a valuation above $15B, led by Tiger Global and GV

Sierra

Sierra raised $950M in a round led by Alphabet's GV and Tiger Global, with Benchmark, Sequoia and Greenoaks joining, at a valuation above $15B, up from $10B in September 2025. The company reported about $150M in annual recurring revenue and customers covering more than 40% of the Fortune 50.

• Valuation rose from $10B (Sept 2025, $350M round) to $15B.
• Agents run on more than 15 open and proprietary models.
• Sierra may use the money to build its own models and cut inference costs.