Sierra AI Raises $950M at $15B — Bret Taylor's 'Agent OS' Targets Fortune 100
There’s a specific moment in platform history when investors stop betting on products and start betting on infrastructure. That moment appears to have arrived for enterprise AI agents — and Sierra AI just cashed a $950 million check to prove it. The San Francisco company, co-founded by Bret Taylor and Clay Bavor, announced a Series E led by Tiger Global and GV (Google Ventures) that values Sierra at over $15 billion. With this raise, Sierra has accumulated more than $1 billion in total capital — and it’s not spending it on experimentation. It’s spending it to become the default deployment layer for enterprise AI agents. ...