YC Summer 2025 (S25)
166 companies Y Combinator lists for Summer 2025, with what each one builds. 85.7% of the tagged companies are AI, up from 80.5% in X25.
- Companies
- 166
- AI share
- 85.7%
- Top sector
- Engineering, Product and Design
- 25 companies
- Second
- Infrastructure
- 14 companies
What’s in Summer 2025
Summer 2025 lists 166 companies so far (X25 had 144). The biggest themes by YC's tags are Developer Tools (23), Infrastructure (11), Open Source (9), Productivity (9) and Fintech (7). The largest sectors are Engineering, Product and Design, Infrastructure, Manufacturing and Robotics and Productivity. 7.9% are based outside the US.
- Developer Tools · 23
- Infrastructure · 11
- Open Source · 9
- Productivity · 9
- Fintech · 7
See what YC asked founders to build · Breakout themes across batches
All Summer 2025 companies
166 companies
- Acrely
Enterprise Voice Agents
B2B6Pittsburgh, PA, USAInactive - AdaptionalAI
AI-powered insurance claims review
B2BSan Francisco, CA, USA - AgentMail
Email Inboxes for AI Agents
Infrastructure10San Francisco, CA, USA - AlaraAI
Procurement Platform for Dental Offices
B2B - Albacore Inc.
Drone submarines
Defense18Philadelphia, PA, USA - AlterAI
Privileged Access Management for AI Agents
Security2New York City, NY, USA - AlturAI
Voice AI Agents for Debt Collection
B2B9Mexico City, CDMX, Mexico - Ambral
AI for account management and customer success
Sales4New York City, NY, USA - args
A better GItHub
Productivity2New York City, NY, USA - AstorAI
Your personal investing agent
Consumer Finance5San Francisco, CA, USA - AutosanaAI
AI agents for E2E testing across mobile & web
Engineering, Product and Design5San Francisco, CA, USA - Autumn
Billing infrastructure for AI
B2B5London, England, United Kingdom - Avelis Health
We audit medical claims for self-insured employers and health plans.
Healthcare IT3New York City, NY, USA - Avent
AI agents for industrial commerce
B2B5San Francisco, CA, USA - b12 LabsAI
Making hard molecules for Pharma and Biotech
Drug Discovery and Delivery3San Francisco, CA, USA - Bitrig
Build and ship native Swift apps with AI
Engineering, Product and Design3San Francisco, CA, USA - Bizzy AIAI
Bizzy works 24/7 so you never miss a lead.
MarketingNew York City, NY, USA - Blank Bio
RNA intelligence for precision medicine
Therapeutics6San Francisco, CA, USA - BlueAI
Your phone finally has someone to run it. Plug in Blue, just ask.
Consumer6San Francisco, CA, USA - BootLoop
Firmware in minutes, not months - rigorously tested on real hardware
Engineering, Product and Design3San Francisco, CA, USA - burntAI
Agentic Operating System for Food Supply Chain
Supply Chain and Logistics3San Francisco, CA, USA - Cactus ComputeAI
Automation Foundation Models For Tiny Devices
Engineering, Product and Design8San Francisco, CA, USA - CareSwift
AI scribe for Ambulance Reports
Healthcare2New York City, NY, USA - Certus AIAI
Replacing the restaurant phone line with Voice AI
B2B8San Francisco, CA, USA
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.