RadixArk
AI Development Tools · AI Compute & Inference
$100Mlatest round · Venture round · May 2026 · 6 mo ago
2backers · Accel, Walden Catalyst Ventures
13H-1B filings in 12 months
200+team · employees, estimated range
Overview
RadixArk builds large-scale inference and training systems for the entire AI community, making frontier-level AI infrastructure open and accessible.
Funding and backers
Total raised
$100M
1 round on record
Latest round
$100M
Venture round · May 2026 · 6 mo ago
Team
201-500
employees, estimated range
Backers
2
Accel, Walden Catalyst Ventures
The money's age
Fresh money
6 months since the last round · not hiring
Momentum
35/100
fresh money, rising traction
Last sign of life
1 mo ago
a posting or a news item
The story so fareach stage dated by its source: the company's releases, the press, registers, filings
May 5
Raised a round Venture round $100M
May 2026
Website went live first capture in the Wayback Machine
Tractionpublic signals, read monthly
Web presence
top 0.09%
of 133.2M domains by links, Common Crawl
Hacker News stories
1
best: 2 points
Funding rounds
| Round | Date | Amount | Investors | Source |
|---|---|---|---|---|
| Venture round | May 2026 | $100M | — | bizjournals.com |
Backed byfrom the funds' portfolios and accelerator catalogs
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Visa sponsorship
13
H-1B filings in 12 months
$253k
Median offered salary
0
Open roles in United States
Who they sponsor
Software developers
11
Data scientists
1
Other computer occupations
1
In the register as RadixArk, Inc., Palo Alto, CA
Other sponsors in the same field
webAI 
Lightning AI
Alert me
US Department of Labor · latest filing May 18, 2026 · Visa details by country
Growth
Hiring Momentum
31/100
Slowing
Open positions
0
0 opened / 0 closed in 30 days
Median time-to-fill
166 days
faster than 6% of the market
Hiring Dynamics
0%
Hiring Focus
The percentage next to each role is its share of the company's job openings over the last 90 days; the arrow shows the shift versus the previous period.
AI/ML
50% ▼
HR
50% ▼
Activity Timeline
Added Unix to stack
Sep 2026
Added Threat Modeling to stack
Sep 2026
Added SOC 2 to stack
Sep 2026
Added SIEM to stack
Sep 2026
Added Rest API to stack
Sep 2026
Added OWASP Top 10 to stack
Sep 2026
Added IAM to stack
Sep 2026
Added HIPAA to stack
Sep 2026
Added Linux to stack
Sep 2026
Added Machine Learning to stack
Sep 2026
Financials
Total raised
$100M
Latest round
Venture - Series Unknown
Funding rounds
1
Funding rounds
| Round | Announced | Amount | |
|---|---|---|---|
| Venture - Series Unknown | 2026 | $100M | Details |
Tech stack
Technologies named in job postings at RadixArk over the last 12 months, by layer, with the share of postings for each.
Technologies in use
69
Postings analysed
20
Stack modernity
67/100AI adopter
Languages
Python70%
C++55%
Go25%
Rust20%
Frameworks & libraries
SGLang100%
CUDA50%
Triton30%
XLA20%
Cloud & platforms
GitHub95%
vLLM30%
AWS15%
Kubernetes15%
AI & ML
LLM100%
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Full RadixArk tech stack
69 technologies · by team · pay by technology · changes · similar stacks
Connections
List
Graph
Found in company registers, site code, DNS and hiring. Each connection shows how sure we are and the evidence, with its source and date.
Shared investors
Walden Catalyst VenturesVia a fund
AccelVia a fund
733 portfolio companies
Click a company to open it. Dashed lines are likely connections. The second step of the network is part of the Pro plan.
Owner
Same company
Same group
Likely
News
Nvidia, AMD back $100M round for AI tooling startup RadixArk
Nvidia, AMD back $100M round for AI tooling startup RadixArk - SiliconANGLE
Read more
Report
RadixArk Launches With $100 Million In Seed Funding To Democratize Frontier AI Infrastructure
RadixArk, an AI infrastructure company founded by the creators of the open-source inference engine SGLang, has launched with $100 million in seed funding at a $400 million post-money valuation. The round was led by Accel and co-led by Spark Capital, with
Read more
Report
AMD Seed Investment In RadixArk Adds New Angle To AI Story
RadixArk has launched with a $100m seed round backed by Advanced Micro Devices, aiming to broaden access to large scale AI infrastructure. The platform is built around SGLang and targets support for new AI model architectures and specialized hardware beyo
Read more
Report
RadixArk Launches with $100 Million in Seed Funding Led by Accel to Grow SGLang and Democratize Frontier AI Infrastructure
PALO ALTO, Calif., May 05, 2026--RadixArk, the company democratizing access to frontier AI infrastructure, launched today with $100 million in Seed funding at a $400 million post-money valuation. The round was led by Accel and co-led by Spark Capital, wit
Read more
Report
Our $100M Seed to Build Open Infrastructure for Frontier AI
RadixArk announces $100 million in Seed funding at a $400 million post-money valuation to build open infrastructure for frontier AI, powered by SGLang and Miles.
Read more
Report
Sources: Project SGLang spins out as RadixArk with $400M valuation as inference market explodes
SGLang, which originated as an open source research project at Ion Stoica's UC Berkeley lab, has raised capital from Accel.
Read more
Report
Offices
Where the company hires and what each office is for
Cities
2
Hiring now
0
Countries
2
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Headquarters
Builds here
Office with open vacancies
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Palo Alto
United States
HQ
Palo Alto Office
3 posted in 90 days 200-500 est. staff
Singapore
Singapore
Regional office
Singapore · Hybrid