RadixArk
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Investors
Founders
About
RadixArk is a Palo Alto, California-based AI infrastructure company building open, scalable systems for training, deploying, and running frontier AI models 1 2. The company was founded by Ying Sheng and Banghua Zhu, AI infrastructure and modeling veterans from xAI and NVIDIA 1. RadixArk’s platform builds on SGLang, an open-source inference engine created by Sheng in 2023 that is deployed across hundreds of thousands of GPUs worldwide and used by Google, Microsoft, NVIDIA, Oracle, AMD, Nebius, LinkedIn, xAI, and Thinking Machines Lab 1. On May 5, 2026, RadixArk launched publicly with a $100M seed round led by Accel and co-led by Spark Capital at a $400M post-money valuation 1 3.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| 2026-05-05 | Seed | $100M | Accel, Spark Capital | NVentures, Salience Capital, A&E Investments, HOF Capital, Walden Catalyst Ventures, AMD, LDV Partners, WTT Investment, MediaTek, Igor Babuschkin, Lip-Bu Tan, Hock Tan, John Schulman, Soumith Chintala, Olivier Pomel, Thomas Wolf, William Fedus, Robert Nishihara, Eric Zelikman, Logan Kilpatrick 1 3 |
What Investors Say
Ivan Zhou, Partner at Accel: “RadixArk enables any engineer to experiment and innovate at the frontier.” 1
Igor Babuschkin, xAI co-founder and angel investor: “SGLang is the absolute best inference framework for large language models.” 1
What Founders Say
Ying Sheng, Co-Founder of RadixArk, on the company’s mission: “Make frontier-level AI infrastructure open and accessible to everyone.” 1
Sources
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BusinessWire, “RadixArk Launches with $100 Million in Seed Funding Led by Accel to Grow SGLang and Democratize Frontier AI Infrastructure,” May 5, 2026. Accessed May 2026. https://www.businesswire.com/news/home/20260505077157/en/RadixArk-Launches-with-$100-Million-in-Seed-Funding-Led-by-Accel-to-Grow-SGLang-and-Democratize-Frontier-AI-Infrastructure↩↩↩↩↩↩↩↩
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TechCrunch, “Sources: Project SGLang spins out as RadixArk with $400M valuation as inference market explodes,” January 21, 2026. Accessed May 2026. https://techcrunch.com/2026/01/21/sources-project-sglang-spins-out-as-radixark-with-400m-valuation-as-inference-market-explodes/↩
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HOF Capital, “Why We Invested in RadixArk,” May 2026. Accessed May 2026. https://hofcapital.substack.com/p/why-we-invested-in-radixark↩↩