ai
Sierra Acquires YC-Backed French AI Startup Fragment in Third Deal
AI customer service startup Sierra announced its acquisition of Fragment, a French company focused on AI workflow integration. The deal marks Sierra's third public acquisition this year. Fragment's co-founders will join Sierra, enhancing its agent development in France.
Apr 23, 5:00 PM·1m read1 source
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Sierra announced on April 23, 2026, that it has acquired the YC-backed French startup Fragment, which helps businesses integrate AI into workflows. This acquisition is Sierra’s third public acquisition. The company acquired Japan-based enterprise AI solutions company Opera Tech in late March 2026.
Sierra also acquired voice agent company Receptive AI in late March 2026. Fragment co-founders Olivier Moindrot and Guillaume Genthail will join the Sierra team. Bret Taylor and Clay Bavor wrote in a blog post that Moindrot and Genthail will bring 'valuable strength' to Sierra’s agent development efforts in France.
Terms of the Sierra-Fragment deal were not announced. Pitchbook estimates that Fragment raised around $2 million through its seed round. Bret Taylor serves as OpenAI’s chairman of the board. Taylor co-founded Sierra alongside Clay Bavor after stepping down as co-CEO of Salesforce in early 2023.
Clay Bavor is a Google alum. Sierra is a customer service agent startup founded by Bret Taylor. The startup claims Casper, Clear, and Brex as customers. Sierra has raised more than $630 million in funding to date.
Sierra’s investors include Sequoia and Benchmark. Sierra has a $10 billion valuation.
