Bret Taylor’s Sierra Raises $950M Funding Round Led by Tiger Global and GV
Bret Taylor’s AI startup Sierra has announced a $950 million funding round led by Tiger Global and GV, pushing the company’s post-money valuation to above $15 billion.
The raise provides Sierra with more than $1 billion in available capital, which the company plans to deploy to achieve its ambition of becoming the “global standard for AI-powered customer experiences.”
Sierra stated that it began just two years ago with only four design partners, but has since expanded rapidly to serve more than 40% of the Fortune 50 companies. Its AI agents are now handling billions of interactions, including mortgage refinancing, insurance claims processing, returns management, and nonprofit fundraising campaigns.
The funding follows a period of strong revenue growth, with Sierra reporting $100 million in ARR in November, followed by $150 million ARR in February, highlighting the accelerating enterprise adoption of AI technologies despite rising infrastructure and deployment costs.
Bret Taylor, who also serves as Chairman of OpenAI and former Co-CEO of Salesforce, previously stated that the best outcome for agentic AI is lower costs and higher revenue for clients, although he acknowledged that the early deployment phase can be capital intensive.
This trend is also visible across the industry. Uber’s CTO recently noted that the company “blew through its AI budget” after adopting agentic AI tools, while also reporting that approximately 10% of code is now generated autonomously, significantly accelerating development timelines.
In April, Sierra launched Ghostwriter, an “agent-as-a-service” platform that enables users to describe their needs in natural language, after which the system automatically builds and deploys custom AI agents.
Taylor emphasized that many enterprise software tools are underutilized today, and the future of enterprise systems will likely shift toward fully autonomous agent-driven workflows, reducing the need for users to navigate complex software platforms directly.
