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RadixArk

DevTools · US

Commercial company behind SGLang, an open-source AI inference optimization tool born at UC Berkeley, used by xAI and Cursor.

Founders

Ying Sheng (China · ♀) — A creator of the open-source SGLang inference engine and former xAI/Databricks researcher who spun the project out as RadixArk in 2025 to commercialize fast, low-cost LLM inference.
Banghua Zhu (China · ♂) — An AI systems researcher and SGLang contributor with NVIDIA experience who co-founded RadixArk to scale the inference framework into infrastructure for frontier AI.

Shares the most investors with (number = shared investors):

Date	Round	Amount
Jan 2026	Seed The open-source SGLang project turned into the startup RadixArk, valued at about $400 million in a round led by Accel of unconfirmed size.	$100M

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