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 purchases of Japan-based enterprise AI firm Opera Tech and voice agent company Receptive AI, both announced in late March. Financial terms were not disclosed. Fragment had raised approximately $2 million through its seed round, according to PitchBook.
Taylor, who also chairs OpenAI’s board, co-founded Sierra in 2023 after departing as co-CEO of Salesforce. The startup counts Casper, Clear, and Brex among its customers and has raised over $630 million, valuing it at $10 billion.
