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.
Winter 2027
(1 companies)
Winter 2026
(199 companies)
10x Science
The AI-native platform for next-generation protein characterization.
21st
Infrastructure and UI building blocks for the agentic internet
ARC Prize Foundation
AI benchmarks that measure general intelligence and inspire new ideas
Aemon
The Forward-Deployed AI Research Engineer
Agentic Fabriq
Okta for Agents.
Alt-X
Automation for institutional-grade financial modeling in Excel
Approxima
Your software should build itself.
Ashr
Automated Multi-Modal Testing for Agents
Asimov
Real-world human movement data for humanoid robots
Aurorin CAD
Claude code for Mechanical Engineers
AutoSitu
AI-native workspace for development plan reviews
Autumn AI
Stalk your prospects at scale.
Avoice
Harvey for Architecture
AxionOrbital Space
Foundation models for 24/7 Earth Observation
Axis
An AI Copilot for Trading Desks
Balance
Full-Stack AI Accounting
BaseFrame
Detect what AI can automate for your team
Beacon Health
AI Employees for Primary Care
BeeSafe AI
Frontier AI Defenses for Social Engineering Attacks
Beyond Reach Labs
Space solar arrays that grow to the size of a football field in orbit
Bidflow
AI Takeoffs for Electrical
Booko
Dynamically pricing the whole economy.
Bubble Lab
Prompt once, automate forever.
Burt
AI teammates for logistics
Button Computer
Button is the wearable AI that can talk.
Byteport
Global upload acceleration for 1GB-100TB files.
Cajal
Scaling formal verification to accelerate scientific discovery
Canary
The first AI QA engineer that understands your code
Captain
Give AI agents accurate knowledge search that scales
Cardboard
Agentic video editor
Cardinal
AI Platform for Precision Outbound
Caretta
Realtime AI for Sales Calls
Carrot Labs
AI Cost Management: Track and attribute AI spend across every provider
Carson
Carson is a desktop AI app that generates custom, sharable workspaces
Cascade
Distilling Proprietary Intelligence
CatchBack Cards
The most thrilling way to create and rip digital collectible packs
CellType
The agentic drug company. We simulate human biology.
Chamber
The AIOps Agent for ML Teams
Chasi
AI Revenue Engine for the Equipment Industry
ClaimGlide
AI automated prior-auths for private medical practices
CodeWisp
Anyone can create real games with AI
Cofia
AI automations that implement themselves
Compresr
LLM context compression for better accuracy
Condor Energy
Software for enterprise energy procurement.
Confluence Labs
AI models that learn from experience
Congruent
AI native radars for self-driving cars
Constellation Space
AI operating system for mega-scale satellite networks.
Copperlane
Agentic Mortgage Origination
Corelayer
AI on-call engineer for data-heavy, regulated industries
Corvera
The context layer for AI-native CPG brands
Crosslayer Labs
Protect, monitor and defend your Internet presence
Crow
AI for Commercial Real Estate
Cumulus Labs
The Fastest Multimodal Inference OS
DAIVIN!
Tankless Dive Gear - Breath Autonomy at Sea, Land & Space
Datoric
Responsibly sourced data for multimodal AI
Didit
Infrastructure for identity and fraud.
fintech · Spain
Ditto Biosciences
Evolutionary intelligence for autoimmune disease
Docura Health
AI-Native Med-Legal Firm
Doomersion
Doomscroll to learn languages
EigenPal
AI Document Workflows for Enterprises
Emdash
Open-source Agentic Development Environment
End Close
AI powered reconciliation for high-volume payments companies
Envariant
Interpretability and reasoning infra for foundation models.
Eos AI
Autonomous OS for healthcare
Fed10
AI agents that replace your policy consultants
Fenrock AI
AI agents for banking back office
Fern
Enabling physical AI at scale.
Fixture
An AI-first CRM built for Startups
Foreman
Keeping contractors on the job site, not behind a desk.
Fort
Strength Tracking Wearable
Forum
The first exchange to trade on attention.
FullSeam
AI agents for corporate accounting teams
Galactic Resource Utilization Space, Inc. (GRU Space)
Moon Hotel -> The Intergalactic Construction Company of Earth
General Astronautics
Robotics for Space R&D
General Legal
The AI native law firm for growth stage companies
Glue
The Interface Design Canvas for AI agents
Grade
API for performance-based payroll
GrazeMate
Robot Cowboys that Herd Cattle with AI Drones
Haladir
Operational Superintelligence for Global Logistics
Hex Security
Agentic Offensive Security at Scale
Hlabs
US-Made Parts for Robots
Human Archive
Multimodal data provider for robotics and world modeling
IncidentFox
AI SRE agent that triages, coordinates, and fixes production incidents
Instinct
Trade your instinct
InventoryQuant
We automate the inventory process in insurance
Inviscid AI
Real-time Physics Simulations for Industrial Facilities & Data Centers
Jinba
Automate enterprise workflows through chat
Kita
Automate credit review for lenders in emerging markets
Klaus AI
Fast and Safe OpenClaw on the cloud
Kyten Technologies
Custom Aerospace-Grade Battery Packs
Lance
AI Agents That Run Hotel Operations.
Laurence
Hedge fund for ads
LegalOS
The AI-Native Immigration Law Firm
Lexius
AI for Corporate Security Cameras
Lucent
AI that automatically improves products from user behavior
Luel
Turning everyday words and actions into usable training data.
Mango Medical
Foundation models for planning orthopedic surgery
Mantis
Digital Twins of humans
Martini
AI Video Production for Professionals
Maven
Payments Infrastructure for Voice Agents
Maywood
The first finance-compliant proactive AI that runs 24/7
Mendral
AI DevOps Engineer
Menza
The AI data analyst for consumer brands
enterprise applications · United Kingdom
Milliray
Technology to detect and track small drones
MochaCare
Agentic Management Service for Care Organizations
Moda
The monitoring layer your AI agents need.
Moritz
Global AI-native law firm handling legal work with same-day turnaround
MouseCat
AI-powered fraud investigations
Ndea
Building AGI that can innovate.
OctaPulse
CV and robotics to automate quality inspection in fish farms
One Robot
World models for robot evals and training.
Opalite Health
Helping Healthcare Providers Speak Any Language
OpenSpec
Plan mode for complex features
Origami Robotics
Manipulate Anything Robot
Origin
AI and Data for Cancer Therapeutics
Orthogonal
Agentic Payments for APIs
Overdrive Health
AI-Native Medical Billing Services
Overshoot
AI Infra for real-time vision applications
Oximy
See and control all AI activity across your enterprise
Oxus
AI-powered automation for internal audit workflows
Palus Finance
40% higher yields on company cash, in under 5 minutes.
Panta
AI Native Commercial Insurance Brokerage
Patientdesk.ai
AI front & back office agent for dental practices
Pax Historia
The first AI-powered grand strategy platform
Payna
AI Licensing Agent for Regulated Industries
Perfectly
The AI-native Recruiting OS
Piris Labs
Inference at Light Speed
Take Notes in the Real World
Pollen
AI agents that automate customer success
Pollinate
AI Agents for the supply chain.
Polymath
Simulation environments to train & evaluate long-horizon AI agents
Polymorph
Personalization infra that improves retention, LTV, and CAC
Prana
An AI primary care doctor in your pocket
Protent
Real time intelligence for law enforcement & security teams.
Proximitty
AI operating system for commercial loans
Q2Q
We help private equity teams find acquisition targets faster
REV1
Claude Code for Mechanical Engineers
RamAIn
Automate any UI task with natural language
Reframe
AI-native, hardware procurement marketplace
healthcare · United States
Remix
Social media content auto-generated with your existing data
Remy AI
Documenting human dexterity
Ressl AI
AI Workers for Field Services
Revion
Intelligence for Automotive Operations
Rhizome AI
Agent Platform for Life Sciences
Ritivel
AI-native platform for Life-Sciences Documentation
Robby
AI agents that grow revenue for home services businesses
RoboDock
Robots that run autonomous depots for autonomous fleets.
Rubric AI
Reasoning and verification infra for AI
Ruma Care
The operations stack for biologic infusion clinics
RunAnywhere
The default way of running on-device AI at Scale
Salus
Guardrails to validate your agent's actions before they execute
Samora AI
Multilingual voice agents that outperform humans
Scheduling Wizard
Logistics infrastructure to modernize healthcare operations
Seeing Systems
Modular AI-Commanded Drones for Defence
Sentrial
Datadog for Agent Reliability
Sequence Markets
Low-latency execution across crypto, prediction, and tokenized assets
Servo7
Robots that 10x manual industry work
Shofo
The World's Largest Video Library
Signals
Proactive AI customer support that engages high-value users
Sila
AI Work Messaging & Collaboration Platform
Skillsync
Hire engineers based on what they’ve shipped
Sonarly
Makes software self-healing
Sparkles
Make everyone on your team an engineer
Sponge
Financial infrastructure for the agent economy
SpotPay
Stablecoin Global Bank Account
Squid
AI agents for power grid planning 🦑
Stilta
Agentic AI for intellectual property
Strand AI
Multimodal foundation models to predict uncollected patient biology
Supafax
AI assistant for your email and calendar
Synthetic Sciences
Claude Code for Scientific Research
Syntropy
The agentic coding app for complex tasks.
Talking Computers
AI for AI Infrastructure
Tepali
AI-native operating system for aesthetics & wellness
Terminal Use
Vercel for background agents
Terranox AI
The first AI-powered uranium discovery company
The Token Company
Compression middleware that improves LLM outputs
Traverse
Research lab solving non-verifiable work
Travo
The data infrastructure for real estate
Unifold
Multi-chain deposit and payment infrastructure
Unisson
AI agents that automate B2B software implementation
VOYGR
Real-world place intelligence for AI apps and agents
Valence
Unified prediction markets trading platform
Valgo
Insurance risk layer for physical AI
Vector Legal
Full service ai law firm & software solution, for startups
Vela
AI Agents For Complex Scheduling Coordination
Velum Labs
The OS for data quality across any stack
Ventura
AI Workforce for Distributors and Manufacturers
Verdex
AI Verification for Insurance
Visibl Semiconductors
A faster, lower cost path to custom silicon
Voltair
Autonomous Drones for Earth Observation
Voxel Energy
Energy independent data centers with solar and repurposed batteries.
Wayco
AI operator for medlegal cases
Wideframe
AI coworker for video editors to ship more video faster
Zatanna
Turning all software into agent-first APIs
ZeroSettle
Drop-in Direct Billing SDK for In-App Purchases
Zymbly
Automates admin for aircraft mechanics
o11
The AI Agent Inside Every Enterprise App
shortkit
Media infra for consumer apps
sitefire
Marketing suite for the agentic web
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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.