Bret Taylor's Sierra Acquires YC-Backed Fragment — Third AI Agent Acquisition in a Month

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Sierra, the AI customer service agent startup co-founded by former Salesforce co-CEO Bret Taylor, acquired YC-backed French startup Fragment, its third acquisition following Opera Tech (Japan) and Receptive AI (voice) in late March. Fragment co-founders Olivier Moindrot and Guillaume Genthial join Sierra's agent development team in France, signaling rapid talent consolidation in the enterprise AI agent market. Fragment had raised approximately $2M through its seed round.