Enterprise Agent Platform Sierra AI Raises $350 Million
The new funding round, led by Greenoaks, values the company at $10 billion and will fuel its expansion in the agentic AI market.
New Funding and Valuation
Sierra AI, a platform for building enterprise-grade artificial intelligence agents, announced on September 4, 2025, that it has raised $350 million in new capital. The funding round was led by the venture capital firm Greenoaks and values the company at $10 billion. The investment signals strong investor confidence in the shift toward agentic AI, where systems autonomously perform complex tasks.
In a company blog post, Sierra positioned itself as a foundational "Agent OS" for businesses. The platform is designed to help companies, particularly in highly regulated industries like finance and healthcare, build and deploy autonomous …
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