May 5, 2026Sierra AI Raises Nearly $1 Billion in Latest Funding RoundBret Taylor's AI company Sierra raised nearly $1 billion in new funding, with Taylor stating that a bulk of enterprise spending is moving to AI agents.May 5, 2026·1 source00
Apr 24, 2026Sierra Acquires YC-Backed AI Startup FragmentSierra, the AI customer service agent startup founded by Bret Taylor, acquired French Y Combinator-backed startup Fragment. Terms were not disclosed.Apr 24, 2026·1 source00
