Sierra, the customer service AI startup co-founded by Bret Taylor, announced on Thursday, April 24, 2026, that it has acquired Fragment, a French AI startup backed by Y Combinator that helps businesses integrate AI into their workflows.
The deal marks Sierra’s third public acquisition. The company previously purchased Japan-based enterprise AI firm Opera Tech and voice agent company Receptive AI, both announced in late March 2026. Financial terms of the Fragment acquisition were not disclosed. PitchBook estimates Fragment had raised approximately $2 million through its seed round.
Fragment co-founders Olivier Moindrot and Guillaume Genthial will join the Sierra team. In a blog post, Taylor and Sierra co-founder Clay Bavor said the two would bring “valuable strength” to Sierra’s “agent development efforts in France.”
Taylor co-founded Sierra alongside Bavor, a former Google executive, after stepping down as co-CEO of Salesforce in early 2023. Taylor also serves as chairman of the board at OpenAI. Sierra counts Casper, Clear, and Brex among its customers and has raised more than $630 million in total funding from investors including Sequoia and Benchmark, giving the company a $10 billion valuation.
The acquisition of a France-based team suggests Sierra may be expanding its operational footprint in Europe, though the company has not made any formal announcements to that effect.
Source: TechCrunch