TensorPool
Acquired
What they do:
Vercel For GPUs
Quick facts:
HQ: San Francisco, CA, United States
Top AI Infrastructure Startups
This list has 81 startups and was last updated on Oct 15, 2026. 17 of them are hiring right now. Biggest hubs: San Francisco (51), London (5), and Seoul (2). Largest teams: Fountain, Prolific, and Superb AI. Latest round: Salience Labs raised $125M (Oct 14, 2026).
81 startupsPage 3 of 3
DAGWorks Inc.
Acquired
What they do:
Open source tools & services for reliable AI Agents & AI Applications
Quick facts:
HQ: San Francisco, CA, United States
Chatter
Acquired
What they do:
Dead simple LLM testing and iteration
Quick facts:
HQ: Philadelphia, PA, United States
OpenPipe
Acquired
What they do:
Turn expensive prompts into cheap fine-tuned models
Quick facts:
HQ: Seattle, WA, United States
Neptune.io
Shut down
What they do:
A self-healing platform to enrich and fix server alerts automatically
Quick facts:
HQ: San Francisco, CA, United States
Mystic
Shut down
What they do:
Low latency API to run and deploy ML models
Quick facts:
HQ: Austin, TX, United States
Atla
Shut down
What they do:
The improvement engine for AI agents
Quick facts:
HQ: London, United Kingdom
Airtrain AI
Shut down
What they do:
No-code data curation for LLM fine-tuning and evaluation.
Quick facts:
HQ: San Francisco, CA, United States
FloydHub
Shut down
What they do:
ML Platform for developing, training and deploying ML models
Quick facts:
HQ: San Francisco, CA, United States