Sierra, the enterprise AI agent platform founded by Bret Taylor, is raising $950 million led by Tiger Global and GV, pushing its post-money valuation above $15 billion. Taylor, who also chairs OpenAI and previously co-led Salesforce, founded Sierra to replace traditional enterprise software interfaces with autonomous AI agents. The company claims over 40% of the […]
The raise gives Sierra more than $1 billion to work with — capital the company says it will use to become the “global standard” for AI-powered customer experiences.
Sierra, the AI customer service agent company founded by Bret Taylor and Clay Bavor, has acquired Fragment, a Y Combinator-backed French startup specialising in AI workflow integration. Fragment co-founders Olivier Moindrot and Guillaume Genthial will join Sierra’s team, strengthening its agent development operations in France. The deal marks Sierra’s third acquisition in 2026, following the […]
Sierra, the AI customer service agent startup founded by technologist Bret Taylor, announced today that it has acquired the YC-backed French startup Fragment.
Sierra, the enterprise AI startup led by co-founder and CEO Bret Taylor, has launched Ghostwriter, a new AI agent designed to create and deploy other agents using natural language. The platform enables users to describe tasks conversationally, allowing Ghostwriter to autonomously build specialised agents, positioning AI as a replacement for traditional click-based software interfaces. Taylor, […]