Batch at a glance
- Size: ~160–180 companies
- Program dates: June – September 2025
- Demo Day: September 2025
- Standard deal: $500K for 7%
- Format: In-person only, San Francisco
- Dominant themes: AI, defense tech, robotics, biotech
What was different about S25
S25 leaned harder into hard tech than W25. Defense, robotics, and biotech companies grew their share noticeably. The batch also saw the first wave of "AI-native" vertical SaaS — companies founded with AI as the product, not as a feature retrofitted later.
FAQ
When was the YC S25 batch?
The Summer 2025 batch ran from June through September 2025, with Demo Day in September 2025. It was the second of YC's four annual batches that year.
How many companies were in YC S25?
Approximately 160–180 companies. AI continued to dominate the cohort at roughly 65–70%, with growing representation from defense tech, robotics, and biotech.
Is YC S25 fully in-person?
Yes. As of W25 onward, YC requires founders to be physically in San Francisco for the full 3-month program. No remote option.
How do I apply to the next YC batch?
Applications open about 8–10 weeks before each batch starts. See our application guide and the official YC application form.