Sierra Buys French AI Startup Fragment to Boost Agent Development

Sierra, founded by former Salesforce co‑CEO Bret Taylor and Google alum Clay Bavor, builds AI‑powered customer service agents. The company announced the purchase on Thursday, marking its third public deal this year after acquiring Japan’s Opera Tech and voice‑agent firm Receptive AI in late March. Sierra counts Casper, Clear, and Brex among its customers and has raised over $630 million from investors such as Sequoia and Benchmark, giving it a $10 billion valuation.

Fragment, which graduated from Y Combinator, helps companies integrate AI into existing workflows. The startup raised roughly $2 million in its seed round, according to PitchBook. Co‑founders Moindrot and Genthial will add “valuable strength” to Sierra’s agent development efforts in France, as noted in a blog post by Taylor and Bavor. Financial terms of the acquisition were not disclosed.

The move deepens Sierra’s presence in Europe and adds talent focused on building adaptable AI agents for enterprise clients. By absorbing Fragment’s technology and team, Sierra aims to accelerate its workflow‑integration offerings.