Anthropic Acquires Bun

December 7, 2025

Anthropic has acquired Bun, the high-performance JavaScript runtime founded by Jarred Sumner, to deepen integration with its Claude Code developer platform. The Bun codebase will remain open source under the MIT license while Anthropic plans to invest in Bun’s capabilities to improve Claude Code performance and developer workflows after Claude Code reached a $1 billion run-rate.

Buyers
Anthropic
Targets
Bun
Industry
Software
Location
California, United States
Transaction Type
Buyout

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