YC-Backed Companies
5,949 Y Combinator portfolio companies tracked in the Altss database. For each company, Altss surfaces which family offices have co-invested alongside YC.
Pro Rata 2025
(101 companies)
Crimson
The AI Associate for Litigation Lawyers

Cua
Give every agent a cloud desktop

Den
Cursor for knowledge workers

Docket
AI agents for web testing

Eloquent AI
The AI Operator for Financial Services

Flott HQ
AI-native operating system for vehicle fleet management

Foundation Industries
We supply hard tech companies with critical components.

Freesolo
Product Native Models

Frekil
RWE Generation in minutes

Galen AI
Personal AI healthcare agent, powered by clinical and wearable data.

Godela
AI Physics Engine to replace simulations and prototypes

Golf
Agentic AI Security and Governance

GroundControl
Vertical AI for highly-regulated manufacturing

HABIT
Conversational robots for physical businesses.

HelixDB
The fastest & most scalable graph-vector database on the market

Hemut
AI-powered operating system for trucking companies.

Human Behavior
Understand your users beyond the numbers

Jeevy Fabrication
AI Driven EPC - Weld Fabrication Contractor

Kaelio
The open-source context layer for data agents

Kairos
Specialized AI for Critical Industries

Kaizen
Automate anything on the web.

Kanava AI
Your First AI Sales Hire for Wholesale Distributors

Kashikoi
Simulation Engine for Benchmarking AI Products

Kestral
We automate your entire product development lifecycle.

Kirana AI
AI manager for physical stores

Klavis AI
Live Environments for Training AI Agents

Labric
The data layer for scientific research

Leeroo
Organizational Superintelligence

Libretto
Turn website workflows into reliable APIs

Lucis
Function Health for Europe
healthcare · France

Lumari
AI Digital Workers for Supply Chain

Lyra
AI native meeting platform

Mbodi AI
Industrial Robots that Learn and Operate Like Humans

Mesmer
The operating system for the 100x Engineering Team

MindFort
Autonomous Security Agents

Minerva
AI native accounting firm

Moby Analytics
AI financial auditors

Morphik
Open-source multimodal search for AI apps

MorphoAI
Software tool for designing robots and machines

Naïve
Autonomous Company Infrastructure

Nimbic AI
Automatically write and update internal docs with every code commit.

Nomi
Realtime Sales Copilot

Notus Autonomous Systems
Arbitrary size interference resistant drone swarms using EHF radios

Novoflow
AI employees that automate medical operations for clinics.
healthcare · United States

Opusense AI
AI for Field Inspection Reports

Orchid
A personal EA in your iMessage

ParaQuery
Managed GPU-accelerated Spark + SQL at 2x speed and half the cost

Parsewise
Multi-document processing for your risk teams, AI agents, pipelines

Partcl
Design a chip in minutes

Pelica
Transforming healthcare operations with AI agents

Percival
Accelerating data analysis for research

PgDog
Scaling engine for PostgreSQL

Photonium
AI-Powered Optical Consulting & Software

Plexe
Open-source agents to build predictive ML models from a prompt

PowerMatrix
Efficient and compact power supply for AI hardware

Prism
AI for the next generation of media

Probo
We help you get compliant while you focus on your business.

Propolis
Hands off QA via intelligent browser agents.

QFEX
24/7 Global Stock Exchange

QualGent
AI Mobile App Quality Assurance Tester

Ralo
Find Your Best Mortgage Deal

Refresh
Training gyms for computer use and software engineering work

Rimba
Streamlining Data Capture to Report Creation for Heavy Industries

RunRL
Reinforcement learning as a service

Scalar Field
Reinventing the trading terminal — one intelligent agent at a time.

Sim
Open source platform to build AI agent workflows

Sixtyfour
Intelligence Infrastructure on People and Entities

StarSling
Self-Driving CI

Sureform
Real-world data for multimodal and embodied AI

Sygaldry Technologies
quantum-accelerated AI servers

Synthio Labs
Agentic AI platform for Pharma GTM teams

Tegore
Your new AI-powered math tutor.

Text.ai
Alfi - your group chat with social skills to bring friends closer

The LLM Data Company
Frontier models for critical domains

The Robot Learning Company
The infrastructure that robot intelligence is built and deployed on.

Theorem
Program verification so even your systems engineers can vibecode

Theta
Specialized AI for Every Job

Third Chair
AI-Native IP Enforcement Agent

Ticket Wallet
AI-optimized ticket resale

Tinfoil
Encrypted AI with verifiable privacy

Trapeze
AI-native Zocdoc

Units
The school for a post-agi world.

ValueMate
Valuemate automates real estate appraisals with AI

Vassar Robotics
Open-source semi-humanoid dev kit → home data → autonomy → 20h/wk

Vesence
Cursor for Lawyers. Agentic AI in MS Office.

Vision Lab
Industrial data layer for robotics training

VoiceOS
The Siri for Productivity

Vybe
Secure internal apps. Built by AI in seconds. Powered by your data.
technology

Waffle
Discover & Build AI Chatbots

Wavedash
Play the latest games in your browser with no downloads

Willow
The voice interface replacing your keyboard
business/productivity software · United States

YouLearn
AI tutor for each student.

Zeon Systems
AI-powered robotics for scientific lab automation.

chrt
chrt is a logistics platform for time-critical shipping

cubic
AI-powered code review platform

mlop
Experiment tracking for training ML models

nao Labs
Open Source Analytics Agent

neoncoral
🪸 AI consumer social

sieve
AI + human review to solve data cleaning - accessible via API or Excel

stratify
AI agents that help you understand your customers' needs

throxy
Vertical AI agents that run the sales funnel on autopilot
F26
(3 companies)F25
(96 companies)
Absurd
AI Videos

AirCaps
The AI copilot for in-person conversations.

Aleph Lab
AI language buddy in the games kids love

Allus AI
Transforming manufacturing with our next-gen Vision Foundation Model

Amera
Automating claims processing workflows for health insurance payers.

Amika
Infra to build your own software factory

AnswerThis
End-to-end workspace to accelerate scientific discovery

Antigen
Continuous offensive security for the enterprise.

Anto Biosciences
A Foundation Model for Microbial Communities.

Arcten
Lab working on long-horizon autonomous research and coding agents

Aside
Operating system for the AI era

Aspect
Intelligent media storage for creative teams.

AtlasGrid
Accelerate Product Iteration

Automax.ai
AI native real-estate appraisal firm

Autonomous Technologies Group
Superintelligent financial advisor

Bluma
Canva for short-form video ads

Bolna AI
Voice AI to enable India's next billion
technology · India

Boom AI
AI agents that recover lost revenue through real conversations.

Bravi
The AI operating system powering home services businesses

Brickanta
Agentic AI for Society Builders
technology · Germany

Brickwise
AI property manager for landlords and estate agents

Bron
ChatGPT for Sports Betting

Caddy
Your partner for everyday work, lives in iMessage

Casey
Casey is an AI-native commercial insurance brokerage

Clad Labs
the brainrot ide

Clicks
AI agents for your back-office operations.

Coasts
Localhost service isolation and orchestration for git worktrees

Codyco
The AI Reservation Team for Hotel Groups

ComplyDo
Global Compliance for Enterprises

Compyle
The coding agent that actually collaborates with you

Cortex AI
Large-scale real-world robot & human data for embodied AI

Cranston AI
Full Stack AI Accounting Firm

Crunched
Excel AI analyst for Power Users

Deeptrace
AI agents for on-call

Denki
The full-stack AI financial audit firm

Digipals
The future of Social in the age of AI

DiligenceSquared
AI-powered market due diligence for investment decisions
fintech · United States

Dome
A unified API for prediction markets, like Kalshi and Polymarket

Efference

Everest

Exonic
Unsupervised Biological AI

Expected Parrot
Simulate your customers with AI agents

Fastshot
Lovable for mobile apps

Fernstone
AI-native insurance brokerage.

Fifth Door
Create and play games with AI
media · United States

Flick
Figma + Cursor, for AI Filmmaking

Forge Robotics
A robotics intelligence system for metal fabrication

Freeport Markets
Trade like a hedge fund.

Goldbridge
Ramp for Real Estate

Helonic
Automatic Construction Drawing Clash Detection

Hypercubic
AI to maintain and modernize COBOL.

Hyperspell
Memory for AI Agents
technology · United States

Icarus
Stratospheric birds for defense

Imagine AI
We reverse engineer B2B growth, starting with LinkedIn.

Inspector
AI IDE for front-end development

Jarmin
24/7 Machine Learning Engineer employees

Kaigo Health
AI outpatient care workforce

Kalpa Labs
Scaling Generalist Speech models

Karumi
The Waymo of Personalized demos

Kestrel AI
AI-Native Cloud Incident Response Platform

Koyal
Agentic AI Filmmaking Platform

Lakonia
Delivering AI-powered situational awareness in tactical environments.

Lapis
AI that creates and runs ads, end-end

Leadbay
Qualify millions of Data-Signal-Scarce leads that couldn't be found…

Lemma
Reliability platform for AI agents

Lexi
AI Associates for Corporate Law

Lightberry
The social brain for robots.

Locus
Payment infrastructure for AI agents

Logical
A proactive desktop copilot. Clippy, but actually good.

LogosGuard
The risk management software for enterprises adopting AI

Lua Global Inc
The mid-market agent platform

LunaBill
AI Voice callers for healthcare billing teams

Lunavo
Lunavo is the AI assistant for carriers.

MOVEdot
AI Agents for Hardware Engineering

MadeThis
The autonomous business platform

Mantle
Build internal agents to automate back office work with one prompt

MarkIt
AI Agents for Trade Compliance - Saving Companies from Tariffs

Mayflower
AI plug-in that automates HR immigration screening and compliance

Metorial
Agentic infrastructure to power AI-native companies.

Miniswap
The Marketplace for Complex Hobbies

Minro
Identify churn risk and stay close to users at scale

Mixy
Make mashups without knowing how to DJ

Mod AI
Touchless AP Automation

Moss
Real-time semantic search for Conversational AI

Multifactor
Zero-trust authentication, authorization, and auditing for AI agents
enterprise applications · United States

Narrative
AI-Powered Sports Highlights

Nerviom
AI Autopilot for Infrastructure Permitting

Nessie
A shared context layer for you, your team, and your agents.

Nexus
We help non-technical teams build AI agents without engineers

Nori
AI health coach in your pocket

Norra
Automating equipment operations for nursing facilities

Nucleo
The first Agentic platform for Oncology

Null Labs
End-to-end Simulation for Defense Autonomy

OpenBuilder
The vibe coding platform where builders actually finish.

Openroll
The AI workforce for People and Finance teams

Parametric
Physical businesses that run themselves
Which family offices back YC companies?
Altss tracks family office deal activity across the YC portfolio. Request access to see investor-level data, round participation, and LP mandates.


