Y Combinator (YC)

Builds AI agent harnesses for asset managers' proprietary research and data

Foundation models for understanding, designing and controlling hardware and physical systems.

AI software that extracts and verifies financial documents to help lenders assess borrowers.

Apollo Atomics develops compact pressurized-water reactors designed for factory manufacturing.

Thunder Compute virtualizes GPUs so multiple workloads can share capacity and data centers can use existing hardware more efficiently.

AI agents that map, document and modernize legacy COBOL applications.

A machine-native browser engine that turns websites into structured workflows AI agents can execute.

Gamgee develops personalized mRNA vaccines for dogs with cancer, designed from the genetic profile of each dog’s tumor.

Rasyn gives chemists a chat interface to run real chemistry software tools on their own hardware.

Lemma monitors AI agents in production and surfaces semantic failures that ordinary system metrics can miss.

Cloud infrastructure for building and testing software through continuous integration workflows.

Builds infrastructure for training and serving personally trainable AI agents

AI-native clearinghouse automating insurance verification and policy workflows

Builds AI agents that discover and accelerate new materials for semiconductor chips

Naïve provides the accounts, tools and runtime infrastructure that AI agents need to operate business workflows.

AI agents that gather property records, prepare real estate contracts and track transactions to closing.

Vector Legal combines lawyers, paralegals and custom AI to deliver startup legal services and technology-enabled workflows.

Builds precision strike and counter-UAS systems for allied militaries

Deploys AI agents automating enterprise operations across voice, email and documents

Andromeda Surgical develops autonomous surgical robots combining anatomical mapping and surgeon oversight, initially for prostate enucleation.

Relationship intelligence platform for enterprise revenue teams

AI platform automating back-office knowledge work for commercial real estate teams

Building a new way to understand the physical world

Healia is a healthcare benefits platform built for dual-income families.

Automates the financial infrastructure of American healthcare

Bunkerhill Health builds an agentic AI platform for health systems to turn their ideas into reality

Hadrius provides an AI-native compliance infrastructure for financial services firms

Building a safer world by deploying low-cost air defense systems at scale

Ollama provides tools for developers to use open AI models.

Automates accounting and back-office work for construction contractors using AI