How much funding has RadixArk raised?

RadixArk has raised $100.0M in total funding, most recently a Seed round.

Who are RadixArk's investors?

RadixArk's investors include Accel, Spark Capital.

Where is RadixArk headquartered?

RadixArk is headquartered in San Francisco, California, United States.

What industry is RadixArk in?

RadixArk operates in Artificial Intelligence, Infrastructure.

RadixArk

Ship AI for All

San Francisco, United States · Founded 2025 · $100.0M raised

Artificial Intelligence

Infrastructure

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

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.

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