Startup profile · funding coverage
RadixArk funding, valuation and investors
Open-source AI infrastructure company building production systems around SGLang inference and Miles RL.
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Funding, valuation & investors
Answer-first snapshotLatest funding
Seed
$100M · May 5, 2026
Latest known valuation
$400M post-money, company-announced
Seed · May 5, 2026
Total disclosed equity funding
$100M
Excludes debt, grants, acquisitions, secondaries, and IPO proceeds.
Current status
private
seed · United States
Investors in latest funding
Lead: Accel , Spark Capital
Other: NVentures , Salience Capital , A&E Investment , HOF Capital , Walden Catalyst , AMD Ventures , MediaTek , Databricks Ventures
Overview
RadixArk was announced May 5, 2026 by SGLang and Miles maintainers. It builds managed production inference and reinforcement-learning systems while continuing to support their open-source foundations. RadixArk announced a $100M seed financing at a $400M post-money valuation, led by Accel and co-led by Spark Capital. NVentures, AMD, Databricks, MediaTek, Salience Capital and other investors participated.
RadixArk does not develop NCM models, but its infrastructure could benefit if parallel-generation architectures become practical.
Why RadixArk is interesting
The practical infrastructure layer for efficient AI across new architectures: SGLang serves models and Miles supports reinforcement-learning post-training. Its funding is directly disclosed and its adoption is measurable through open source.
Product & use cases
Managed open-model serving based on SGLang; Miles distributed reinforcement learning and post-training infrastructure.
- Low-latency, high-throughput inference on open language models
- Scalable reinforcement learning and model post-training
- Inference hardware- and model-architecture optimization
Key facts
- $100M seed at $400M post-money, May 5, 2026
- Led by Accel and co-led by Spark Capital
- Built around SGLang inference and Miles reinforcement-learning infrastructure
Funding history (newest first)
Seed
2026-05-05 $100M Valuation: $400M post-money, company-announced- Accel (lead)
- Spark Capital (lead)
- NVentures (participant)
- Salience Capital (participant)
- A&E Investment (participant)
- HOF Capital (participant)
- Walden Catalyst (participant)
- AMD Ventures (participant)
- MediaTek (participant)
- Databricks Ventures (participant)
Source: Read source · radixark.com
Competitive landscape
Edge: Open-source SGLang and Miles maintainer expertise with cross-model and cross-hardware integrations, rather than one proprietary model.
Competes with Inferact/vLLM, Fireworks, Together AI and other managed inference stacks. Platform demand may expand as the architecture mix fragments, but actual model support, utilization and gross margins determine economic advantage.
Market / IPO context
Editorial / static context — not a live quote.
FAQs about RadixArk
Practical answers founders, operators, and investors typically search for.
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Editorial note: AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.