RadixArk
Ship AI for All
San Francisco, United States · Founded 2025 · $100.0M raised
- Headquarters
- San Francisco, California
- Employees
- 11–50
- Founded
- 2025
- Business Model
- B2B
- Website
- radixark.com
- Total Funding
- $100.0M
- Last Round
- $100.0M SeedMay 2026
- Rounds
- 1
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 1 funding round and 2 investors for this company. The full record is or through the API.
About
RadixArk is an infrastructure-first AI company building large-scale inference and training systems for the entire AI community. Founded by Ying Sheng (CEO, ex-xAI) and Banghua Zhu (CTO, UC Berkeley), RadixArk spun off from the SGLang open-source project to make frontier-level AI infrastructure open and accessible to everyone. For inference, the company builds on SGLang — the fastest open engine for serving modern models. For RL training, it develops Miles, an open-source framework for large-scale post-training. On top of these open cores, RadixArk ships managed infrastructure and tooling for individual developers, startups, enterprises, and research labs. The company launched publicly in May 2026 with $100M in seed funding at a $400M valuation, led by Accel.
Summary
RadixArk is an Artificial Intelligence company based in San Francisco, United States, founded in 2025. It has raised $100.0M in total across 1 round, most recently a $100.0M Seed round in May 2026. Investors include Accel and Spark Capital.
Tech & App Stack
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Funding History
May 2026
Investors
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