YC Winter 2026 (W26)
197 companies Y Combinator lists for Winter 2026, with what each one builds.
- Companies
- 197
- AI share
- Not enough tags yet
- Top sector
- Infrastructure
- 22 companies
- Second
- Engineering, Product and Design
- 18 companies
YC has tagged only 28.4% of this batch so far, so we don’t publish an AI share for it yet.
What’s in Winter 2026
Winter 2026 lists 197 companies so far (F25 had 145). The biggest themes by YC's tags are Infrastructure (9), Developer Tools (8), Fintech (6), Reinforcement Learning (5) and Data Engineering (4). The largest sectors are Infrastructure, Engineering, Product and Design, Legal and Manufacturing and Robotics. 11.5% are based outside the US.
- Infrastructure · 9
- Developer Tools · 8
- Fintech · 6
- Reinforcement Learning · 5
- Data Engineering · 4
See what YC asked founders to build · Breakout themes across batches
All Winter 2026 companies
197 companies
- /dev/fast
/dev/fast is the AI-native code forge
B2B4San Francisco, CA, USA - 10x ScienceAI
The AI-native platform for next-generation protein characterization.
B2B5San Francisco, CA, USA - 21st
UI building blocks for the agentic internet
Engineering, Product and Design3San Francisco, CA, USA - Aemon
The Forward-Deployed AI Research Engineer
B2B3San Francisco, CA, USA - Agentic FabriqAI
The control plane for AI agents.
Security2San Francisco, CA, USA - Alt-X
Building the best venue for private markets exposure.
Fintech2Los Angeles, CA, USA - Anchorhead
Evals for frontier research agents
Engineering, Product and Design1San Francisco, CA, USA - ARC Prize Foundation
AI benchmarks that measure general intelligence and inspire new ideas
Industrials4San Francisco, CA, USA - AshrAI
Enterprise post-training, monitoring, and continual learning platform
B2B2San Francisco, CA, USA - Asimov
Real-world human movement data for humanoid robots
Manufacturing and Robotics3San Francisco, CA, USA - Aurorin CAD
Claude code for Mechanical Engineers
Engineering, Product and Design1San Francisco, CA, USA - AutoSitu
The AI operating system for the built world
Legal2 - Autumn
The people-intelligence company.
Infrastructure4San Francisco, CA, USA - Avoice
AI-native workspace for AEC
B2B7San Francisco, CA, USA - AxionOrbital Space
Foundation models for 24/7 Earth Observation
Aviation and Space2San Francisco, CA, USA - Axis
An AI Copilot for Trading Desks
Fintech2New York City, NY, USA - Balance
Full-Stack AI Accounting
Finance and Accounting20London, England, United Kingdom - BaseFrame
Detect what AI can automate for your team
B2B2San Francisco, CA, USA - Beacon Health
AI Employees for Primary Care
Healthcare2San Francisco, CA, USA - BeeSafe AI
Frontier AI Defenses for Social Engineering Attacks
Security3San Francisco, CA, USA - Beyond Reach Labs
Space solar arrays that grow to the size of a football field in orbit
Aviation and Space15New York City, NY, USA - BidflowAI
AI Takeoffs for Electrical
Construction2New York City, NY, USA - Booko
Dynamically pricing the whole economy.
B2B5San Francisco, CA, USA - BrumbyAI
Robot Cowboys that Herd Cattle with AI Drones
Agriculture3Sydney, NSW, Australia
Source: Y Combinator’s public company directory. Each company links to its YC profile. See how we count and what YC asked founders to build.