# Bret Taylor's Sierra acquires YC-backed AI startup Fragment

_Thursday, April 23, 2026 at 8:42 PM EDT · AI, Startups · Latest · Tier 2 — Notable_

![Bret Taylor's Sierra acquires YC-backed AI startup Fragment — Primary](https://techcrunch.com/wp-content/uploads/2022/10/AP22166762615783.jpg?resize=1200,800)

Sierra, the customer service agent startup founded by Bret Taylor, announced on Thursday that it has acquired the YC-backed French startup Fragment, which helps businesses integrate AI into workflows.

This is Sierra's third public acquisition. It previously bought Japan-based enterprise AI solutions company Opera Tech and voice agent company Receptive AI, both in late March. Fragment co-founders Olivier Moindrot and Guillaume Genthial will be joining the Sierra team.

In a blog post, Taylor and his co-founder Clay Bavor wrote that Moindrot and Genthial will bring "valuable strength" to Sierra's "agent development efforts in France." Terms of the deal were not announced. PitchBook estimates that Fragment raised around $2 million through its seed round.

Taylor, who also serves as OpenAI's chairman of the board, co-founded Sierra alongside Google alum Bavor after stepping down as co-CEO of Salesforce in early 2023. The startup claims Casper, Clear, and Brex as customers and has raised more than $630 million in funding to date, from investors including Sequoia and Benchmark, giving it a $10 billion valuation.

## Sources

- [TechCrunch](https://techcrunch.com/2026/04/23/bret-taylors-sierra-buys-yc-backed-ai-startup-fragment/)

---
Canonical: https://techandbusiness.org/newswire/nMSxjXpD1FV0FKp4ZQNCdk
Retrieved: 2026-04-24T03:50:36.296Z
Publisher: Tech & Business (techandbusiness.org)