Bret Taylor's Sierra acquires Fragment, a Y Combinator-backed AI startup, to expand its customer service automation platform

Sierra, the AI customer service company founded by former Salesforce co-CEO Bret Taylor, bought Fragment, a startup that uses AI to handle customer support conversations. The deal was announced in April 2026, though the acquisition price was not disclosed.

Fragment specializes in AI agents (software that makes decisions and takes actions on its own) trained to understand and respond to customer messages across email, chat, and other channels. Sierra is adding Fragment's technology to its existing platform so customers can deploy these agents faster without building them from scratch.

For business teams using Sierra—customer service departments, support operations, and customer success teams—this means they can now deploy AI agents to handle routine inquiries (returns, billing questions, account status) with less manual setup and configuration work, freeing human agents to focus on complex or sensitive issues.