Centaur
Hiring
What they do:
We Create Superior Data By Making Annotation Competitive
Quick facts:
HQ: Boston, MA, United States
Top Data Labeling Startups
This list has 23 startups and was last updated on Oct 15, 2026. 8 of them are hiring right now. Biggest hubs: San Francisco (16) and New York (4). Largest teams: Perit.AI, Centaur, and Sieve.
23 startups
What they do:
Expert-led data and RL platform for AI labs
Quick facts:
HQ: San Francisco, CA, United States
Sieve
Hiring
What they do:
The multimodal data lab
Quick facts:
HQ: San Francisco, CA, United States
Spade
Hiring
What they do:
Spade is the data and AI platform for modern finance.
Quick facts:
HQ: New York, NY, United States
AfterQuery
Hiring
What they do:
Applied research lab curating data solutions for foundation model…
Quick facts:
HQ: San Francisco, CA, United States
Besimple AI
Hiring
What they do:
Voice data for AI
Quick facts:
HQ: San Francisco, CA, United States
Unbound
Hiring
What they do:
Use AI tools without fear of data leakage
Quick facts:
HQ: San Francisco, CA, United States
Raycaster
Hiring
What they do:
Agentic AI for knowledge work
Quick facts:
HQ: New York, NY, United States
Lightly
Hiring
What they do:
Help ML teams label the right data
Quick facts:
HQ: Zürich, Switzerland
What they do:
Building socially intelligent AI
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Expert STEM reasoning data for frontier AI labs.
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Frontier Data
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Real-world company data for frontier AI
Quick facts:
HQ: San Francisco, CA, United States
What they do:
The World's Largest Video Library
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Evals, RL environments and training data for creative tasks
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Building reinforcement learning environments
Quick facts:
HQ: San Francisco, CA, United States
What they do:
The secure training data R&D engine for physical AI
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Virtual Reality for Training Robots
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Expert computer-use data for frontier AI labs
Quick facts:
What they do:
The biggest crowdsourced benchmark for Computer-Use
Quick facts:
HQ: San Francisco, CA, United States
Sepal AI
Acquired
What they do:
Data Development for Advanced AI
Quick facts:
HQ: San Francisco, CA, United States
Deasy Labs
Acquired
What they do:
Metadata for GenAI workflows
Quick facts:
HQ: New York, NY, United States
JumpWire
Acquired
What they do:
Dynamic access controls for all data and databases
Quick facts:
HQ: New York, NY, United States
Questions and answers
How many startups are on this list?
There are 23 startups on this list, last updated on Oct 15, 2026.
Which of them are hiring?
8 of them are hiring right now, including Centaur, Sieve, and Spade.
Which of them have the largest teams?
By team size: Perit.AI (47 employees), Centaur (45 employees), and Sieve (34 employees).
Where are they based?
The biggest hubs are San Francisco (16) and New York (4).