RadixArk, a Palo Alto, California-based AI infrastructure company, has launched with $100 million in Seed funding.
Investors
The round was led by Accel and co-led by Spark Capital, with participation from NVentures, Salience Capital, A&E Investments, HOF Capital, Walden Catalyst Ventures, AMD, LDV Partners, WTT Investment, MediaTek, and several prominent angel investors.
Founded in 1983 and headquartered in Palo Alto, California, Accel is a global venture capital firm that partners with exceptional founders from inception through all phases of growth. The firm has backed category-defining technology companies across consumer, enterprise, and infrastructure sectors through a long-term, founder-centric approach. Accel operates globally, investing across North America, Europe, Israel, India, and Southeast Asia.
Spark Capital is a multi-stage venture capital firm that invests in disruptive technology companies across all stages, from seed to growth. The firm focuses on sectors such as consumer internet, enterprise software, fintech, AI, and media. Headquartered in San Francisco, with additional offices in New York and Boston.
RadixArk Use of Funds
The company will use the funding to grow SGLang, support emerging AI model architectures and hardware platforms, and build large-scale inference and training infrastructure for next-generation AI applications.
About RadixArk
Founded by Ying Sheng and Banghua Zhu, RadixArk is an AI infrastructure company building open, scalable systems for training, deploying, and running frontier AI models. The company builds on two open-source foundations: SGLang for inference and Miles for reinforcement learning.
RadixArk helps enterprises, startups, and developers build and manage AI systems using open, shared, and cost-efficient infrastructure. Headquartered in Palo Alto, California, RadixArk’s mission is to make frontier-level AI infrastructure open and accessible to everyone.
Funding Details
Company: RadixArk, Inc.
Raised: $100.0M
Round: Seed
Funding Date: May 2026
Lead Investor: Accel, Spark Capital
Additional Investors: 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, and Logan Kilpatrick
Company Website: https://www.radixark.com/
Software Category: AI Infrastructure / Open-Source AI Inference Platform
Source: https://www.businesswire.com/news/home/20260505077157/en/