What they do:
Reusable heavy-lift rockets
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HQ: Dresden, Germany
Y Combinator Fall 2026 Startups
This list has 139 startups and was last updated on Oct 15, 2026. 13 of them are hiring right now. Biggest hubs: San Francisco (96), New York (7), and Los Angeles (4). Largest teams: Perit.AI, Ignition Benefits, and Invertix.
139 startupsPage 2 of 4
What they do:
Hickory offers agentic compliance and BSA for banks and fintechs
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HQ: Salt Lake City, UT, United States
What they do:
Roma is the to-do list that does itself
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What they do:
Build everyday back-office agents on one live model of your books
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HQ: San Francisco, CA, United States
What they do:
Discover novel defense related materials/molecules.
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HQ: Haifa, Israel
What they do:
Wet lab infrastructure that turns AI experiments into training data.
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HQ: San Francisco, CA, United States
What they do:
The best cloud VMs for billions of agents
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What they do:
See and control what your agents actually do
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HQ: San Francisco, CA, United States
What they do:
Predictive maintenance for power infrastructure.
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HQ: Baltimore, MD, United States
What they do:
An AI-operated logistics company.
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HQ: San Francisco, CA, United States
What they do:
Embodied Scientific Intelligence
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HQ: San Francisco, CA, United States
What they do:
Maximum information per experiment, minimum experiments per conclusion
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HQ: Lund, Sweden
What they do:
An AI bracelet that remembers your day and acts before you ask.
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HQ: San Francisco, CA, United States
What they do:
Motor cortex for physical AI
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HQ: San Francisco, CA, United States
What they do:
Continuous optimization for AI agents
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HQ: San Francisco, CA, United States
What they do:
Swarms of agents acting like users to find bugs before release
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HQ: London, United Kingdom
What they do:
100% automated inspection for consumer electronics parts
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HQ: San Francisco, CA, United States
What they do:
The managed cloud for AI agents.
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HQ: San Francisco, CA, United States
What they do:
Kill the drone, keep the jet. Reusable unmanned interceptors.
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HQ: Denver, CO, United States
What they do:
AI Compliance for Affordable Housing
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HQ: New York, NY, United States
What they do:
Turn how your team works into playbooks and agents
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HQ: San Francisco, CA, United States
What they do:
The fully autonomous intelligence layer in the sky.
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HQ: Boston, MA, United States
What they do:
Robots for vehicle maintenance.
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HQ: San Francisco, CA, United States
What they do:
Co-designing the fastest intelligence
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HQ: San Francisco, CA, United States
What they do:
Foundation models on enterprise transaction data.
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HQ: San Francisco, CA, United States
What they do:
AI native TPA starting with workers comp
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HQ: San Francisco, CA, United States
What they do:
Legora for AEC (Architecture, Engineering, & Construction) firms
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HQ: San Francisco, CA, United States
What they do:
Self-optimizing inference cloud for faster, cheaper AI
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HQ: San Francisco, CA, United States
What they do:
Next-generation agent operating system
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HQ: San Francisco, CA, United States
What they do:
AI that works for in-house legal teams
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HQ: San Francisco, CA, United States
What they do:
Test agents in realistic worlds built from production usage
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HQ: San Francisco, CA, United States
What they do:
On-device AI that knows your entire life and does your work overnight.
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HQ: San Francisco, CA, United States
What they do:
AI users that test your app on every device and browser
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HQ: San Francisco, CA, United States
What they do:
AI tourist visa agent for people with weak passports.
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What they do:
A factory for small and specialized video reasoning models
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What they do:
World's Earliest Test for Alzheimer's Biomarkers
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HQ: San Francisco, CA, United States