Sierra Raises $950M as Investors Bet Big on AI Agents
SAN FRANCISCO — Sierra, the AI customer service agent company co-founded by former Salesforce co-CEO Bret Taylor, has raised $950 million in a Series E funding round, the company confirmed Sunday.
The round was led by Tiger Global Management and Google’s venture arm GV, with participation from Benchmark, Sequoia Capital, Greenoaks and other investors, according to CNBC.
The funding comes just months after Sierra’s previous fundraise, reflecting demand for enterprise-focused agentic AI platforms even as broader venture markets remain selective.
Taylor, who also serves as chair of OpenAI’s board of directors, co-founded Sierra to build AI agents capable of handling complex customer service interactions for large enterprises. His dual role atop both an AI startup and the OpenAI board gives Sierra unusual visibility in the sector.
The follow-on raise — with Sierra returning to investors ahead of a typical funding cadence — reflects a pattern seen across the agentic AI space, where companies building autonomous software agents have attracted high valuations. Investors have increasingly distinguished between generative AI companies focused on foundational models and those, like Sierra, building application-layer agent platforms for specific enterprise workflows.
Tiger Global’s lead position marks another AI investment for the New York-based firm, which has deployed capital into AI infrastructure and application companies over the past two years. GV’s co-lead adds a strategic dimension, given Google’s own push into enterprise AI through its Cloud division and Gemini model family.
The participation of Benchmark, Sequoia and Greenoaks — firms that have backed Sierra in earlier rounds — reflects continued support from existing investors.
The enterprise AI agent market has become a contested market segment, with Salesforce, Microsoft, ServiceNow and a growing roster of startups vying to automate customer-facing workflows. Sierra’s fundraise suggests that investors see room for independent platforms alongside the incumbents.
