Companies205
Active98%
Acquired or public0%
Inactive2%
Y Combinator's directory lists 205 companies in the Winter 2026 batch: 200 Active, 0 Acquired, 0 Public and 5 Inactive. Winter 2026 is less than two years out, so its Inactive share (2%) is not yet comparable with older batches (23% across batches at least two years old).
ActiveAcquiredPublicInactive
Statuses are Y Combinator's own listing in its public company directory, read on the date shown. YC's directory can drop companies altogether, so the Inactive counts here are a floor, not a full count of companies that stopped. Acquired and Public are as YC lists them; neither says anything about the price or the outcome for founders.
What the directory lists about Winter 2026
- By the industry YC files each company under: B2B 128, Industrials 30, Fintech 18, Healthcare 18, Consumer 8, Real Estate and Construction 3.
- Where 193 of the 205 companies say they are based, by the first location each lists: San Francisco, CA, USA (132), New York City, NY, USA (20), London, England, United Kingdom (8), San Francisco (7), Los Angeles, CA, USA (3), Seattle, WA, USA (3), Toronto, ON, Canada (3), Bengaluru, KA, India (2), and 13 other places.
- Earlier names on the entries: /dev/fast (earlier Workable Solutions Inc., Fix.Fast and Carson); 21st (earlier 1code by 21st.dev, 1code (21st.dev), 1code (ex: 21st.dev) and 21st.dev); Anchorhead (earlier Willow and Glue); Approxima (earlier Sidekit); Aurorin CAD (earlier Rapid CAD and Aurorin); AutoSitu (earlier MirageDoodle, Inc.); Autumn AI (earlier Chiral Labs); Axis (earlier Sweep); Balance (earlier Balance AI); BaseFrame (earlier Clam and Clam (formerly Baseframe)); Bidflow (earlier Playdo.ai and Ghostship); Brumby (Formerly GrazeMate) (earlier GrazeMate); Button Computer (earlier Vibe Code Go); Cajal (earlier Cajal Technologies); Carrot Labs (earlier Anyware); and 77 more.
- Status changes seen since tracking began on September 26, 2026: Valence, Active to Inactive (seen November 6, 2026); Klaus AI, Active to Inactive (seen October 15, 2026).
Every company in Winter 2026
| Company | What they do | Status | Team |
|---|---|---|---|
| /dev/fast | /dev/fast is the AI-native code forge | Active | 4 |
| 10x Science | The AI-native platform for next-generation protein characterization. | Active | 5 |
| 21st | UI building blocks for the agentic internet | Active | 3 |
| Aemon | The Forward-Deployed AI Research Engineer | Active | 3 |
| Agentic Fabriq | The control plane for AI agents. | Active | 2 |
| Alt-X | Building the best venue for private markets exposure. | Active | 2 |
| Anchorhead | Evals for frontier research agents | Active | 1 |
| Approxima | Consumer app studio. | Active | 2 |
| ARC Prize Foundation | AI benchmarks that measure general intelligence and inspire new ideas | Active | 4 |
| Ashr | Enterprise post-training, monitoring, and continual learning platform | Active | 2 |
| Asimov | Real-world human movement data for humanoid robots | Active | 3 |
| Aurorin CAD | Claude code for Mechanical Engineers | Active | 1 |
| AutoSitu | The AI operating system for the built world | Active | 2 |
| Autumn AI | The people-intelligence company. | Active | 4 |
| Avoice | AI-native workspace for AEC | Active | 7 |
| AxionOrbital Space | Foundation models for 24/7 Earth Observation | Active | 2 |
| Axis | An AI Copilot for Trading Desks | Active | 2 |
| Balance | Full-Stack AI Accounting | Active | 20 |
| BaseFrame | Detect what AI can automate for your team | Active | 2 |
| Beacon Health | AI Employees for Primary Care | Active | 2 |
| BeeSafe AI | Frontier AI Defenses for Social Engineering Attacks | Active | 3 |
| Beyond Reach Labs | Space solar arrays that grow to the size of a football field in orbit | Active | 15 |
| Bidflow | AI Takeoffs for Electrical | Active | 2 |
| Booko | Dynamically pricing the whole economy. | Active | 5 |
| Brumby (Formerly GrazeMate) | Robot Cowboys that Herd Cattle with AI Drones | Active | 3 |
| Bubble Lab | The intelligence layer for communities and events. | Active | 2 |
| Burt | AI teammates for logistics | Active | 2 |
| Button Computer | The tiny computer built for voice AI. | Active | 1 |
| Byteport | Global upload acceleration for 1GB-100TB files. | Active | 4 |
| Cajal | Scaling formal verification to accelerate scientific discovery | Active | 2 |
| Canary | Adversarial AI that breaks your AI | Active | 2 |
| Captain | Self-tuning search for products and files | Active | 2 |
| Cardboard | AI video editor (raw footage into finished videos) | Active | 8 |
| Cardinal | Revenue Agents for GTM teams | Active | — |
| Caretta | Realtime AI for Sales Calls | Active | 4 |
| Carrot Labs | AI Cost Management: Track and attribute AI spend across every provider | Active | 2 |
| Cascade | Distilling Proprietary Intelligence | Active | 2 |
| CatchBack Cards | The most thrilling way to create and rip digital collectible packs | Active | 7 |
| CellType | The agentic drug company. We simulate human biology. | Active | 5 |
| Chamber | The AIOps Agent for ML Teams | Active | 4 |
| Chasi | AI Revenue Engine for the Equipment Industry | Active | 2 |
| ClaimGlide | AI automated prior-auths for private medical practices | Active | 1 |
| CodeWisp | Anyone can create real games with AI | Active | 3 |
| Cofia | AI automations that implement themselves | Active | 3 |
| Compresr | LLM context compression for better accuracy | Active | 3 |
| Condor Energy | Software for enterprise energy procurement. | Active | 3 |
| Confluence Labs | AI models that learn from experience | Active | 2 |
| Congruent | AI native radars for self-driving cars | Active | 2 |
| Constellation Space | AI operating system for mega-scale satellite networks. | Active | 4 |
| Copperlane | Agentic Mortgage Origination | Active | 3 |
| Corelayer | AI production engineer for regulated industries | Active | 3 |
| Corvera | The AI sales agent for CPG brands | Active | 3 |
| Crosslayer Labs | Protect, monitor and defend your Internet presence | Active | 3 |
| Cumulus Labs | The Fastest Multimodal Inference OS | Active | 2 |
| DAIVIN! | Tankless Dive Gear - Breath Autonomy at Sea, Land & Space | Active | 1 |
| Didit | Infrastructure for identity and fraud. | Active | 20 |
| Ditto Biosciences | Evolutionary intelligence for autoimmune disease | Active | 4 |
| Docura Health | AI-Native Med-Legal Firm | Active | 3 |
| Doomersion | Doomscroll to learn languages | Active | 4 |
| EigenPal | AI Document Workflows for Enterprises | Active | — |
| Emdash | One app for all your coding agents | Active | 4 |
| End Close | AI powered reconciliation for high-volume payments companies | Active | 2 |
| Envariant | Interpretability and reasoning infra for foundation models. | Active | 1 |
| Eos AI | Autonomous OS for healthcare | Active | 2 |
| Fed10 | AI Agents for Government Affairs | Active | 3 |
| Fenrock AI | AI agents for banks | Active | 2 |
| Fern | RL environments for robotics companies | Active | 2 |
| Fixture | An agentic CRM built for Startups | Active | 5 |
| Foreman | Keeping contractors on the job site, not behind a desk. | Active | 2 |
| Fort | Strength Tracking Wearable | Active | 4 |
| Forum | The first exchange to trade on attention. | Active | 2 |
| FullSeam | AI agents for corporate accounting teams | Active | 3 |
| Galactic Resource Utilization Space, Inc. (GRU Space) | Moon Hotel -> The Intergalactic Construction Company of Earth | Active | 5 |
| General Astronautics | Superintelligent space Robots | Active | 4 |
| General Legal | Elite AI law firm for high growth companies | Active | 40 |
| Grade | API for performance-based payroll | Active | 2 |
| GRU Space | Moon Hotel -> The Intergalactic Construction Company of Earth | Active | 5 |
| Haladir | Operational Intelligence for Global Logistics | Active | 4 |
| Hlabs | US-Made Parts for Robots | Active | 1 |
| Human Archive | Physical AI data lab | Active | 100 |
| IncidentFox | AI SRE agent that triages, coordinates, and fixes production incidents | Active | 2 |
| Instinct | Trade with superhuman instinct | Active | 5 |
| InventoryQuant | We automate the inventory process in insurance | Active | 1 |
| Inviscid AI | Fast Physics Simulations for Rapid Design and Real Time Control | Active | 2 |
| Janeen | Prior auths and benefits investigation for infusion clinics | Active | 5 |
| Jinba | Automate enterprise workflows through chat | Active | 11 |
| Khotan (formerly Pollinate) | FDE as a platform for rebuilding critical operations in software. | Active | 2 |
| Kita | Underwrite borrowers around the world in minutes | Active | 3 |
| Lance | AI Agents That Run Hotel Operations. | Active | 10 |
| Laurence | Quantitative research for autonomous e-commerce growth | Active | 2 |
| LegalOS | The AI-Native Immigration Law Firm | Active | 3 |
| Lexius | AI for Corporate Security Cameras | Active | 3 |
| Lucent | AI that automatically improves products from user behavior | Active | 2 |
| Luel | Turning everyday words and actions into usable training data. | Active | 12 |
| Mango Medical | Foundation models for planning orthopedic surgery | Active | 3 |
| Mantis | Digital Twins of humans | Active | 3 |
| Martini | AI Video Production for Professionals | Active | 2 |
| Maven | Payments for Conversational Agents | Active | 2 |
| Maywood | The first finance-compliant proactive AI that runs 24/7 | Active | 5 |
| Mendelia | AI-powered back office employees for surgical practices | Active | 2 |
| Menza | The AI data analyst for consumer brands | Active | 3 |
| Milliray | Technology to detect and track small drones | Active | 3 |
| Mirabelle | Your own chef at home | Active | 2 |
| MochaCare | Agentic Management Service for Care Organizations | Active | 2 |
| Moda | Your agents should never make the same mistake twice. | Active | 6 |
| Moritz | Global AI-native law firm handling legal work with same-day turnaround | Active | 10 |
| MouseCat | AI to fight financial crime | Active | 6 |
| Ndea | Building AGI that can innovate. | Active | 15 |
| o11 | OpenRouter wallet for paid goods and services | Active | 2 |
| OctaPulse | OctaPulse builds computer vision and robotics for fish farms and… | Active | 2 |
| One Robot | World models for robot evals and training. | Active | 2 |
| Opalite Health | Helping Healthcare Providers Speak Any Language | Active | 3 |
| OpenSpec | Plan mode for complex features | Active | — |
| Origami Robotics | Manipulate Anything Robot | Active | 5 |
| Origin | AI and Data for Cancer Therapeutics | Active | 8 |
| Orthogonal | Agentic Payments for APIs | Active | 2 |
| Ossus | Intelligence for cultural institutions | Active | 3 |
| Overdrive Health | AI-Native Medical Billing Services | Active | 1 |
| Overshoot | We optimize inference stacks for teams | Active | 5 |
| Oximy | Take command of the AI your company already runs on. | Active | 8 |
| Oxus | AI-powered automation for internal audit workflows | Active | 3 |
| Palus Finance | Your startup's financial advisor | Active | 2 |
| Panta | AI Native Commercial Insurance Brokerage | Active | 3 |
| Parameter | AI pentesting, that works! | Active | 14 |
| Patientdesk.ai | AI front & back office agent for dental practices | Active | 5 |
| Pax Historia | The first AI-powered worldbuilding and gameplay platform | Active | 6 |
| Payna | AI Licensing Agent for Regulated Industries | Active | 2 |
| Perfectly | The AI-native Recruiting OS | Active | 4 |
| Piris Labs | The Networking Layer of AI | Active | 8 |
| Take Notes in the Real World | Active | 35 | |
| Pollen | AI employees trained on your firm's workflows. | Active | 3 |
| Polymath | Simulation environments for training & evaluating autonomous agents | Active | 6 |
| Polymorph | Building secure polymorphic apps | Active | 4 |
| Prana | An AI primary care doctor in your pocket | Active | 4 |
| Protent | Real time intelligence for law enforcement & security teams. | Active | 2 |
| Proximitty | AI operating system for commercial loans | Active | 2 |
| Quotient Labs | Use Claude Code at 47% less cost in one line of installation. | Active | 2 |
| RamAIn | RamAIn - AI Employees with a computer to perform business tasks just… | Active | 7 |
| Reframe | AI-native, hardware procurement marketplace | Active | 1 |
| Remix | Social media content auto-generated with your existing data | Active | — |
| Remy AI | Automating dexterous tasks in warehouses with AI-powered robots | Active | 2 |
| Ressl AI | Train, eval and build autonomous agents | Active | 3 |
| REV1 | Claude Code for Mechanical Engineers | Active | 2 |
| Revion | Intelligence for Automotive Operations | Active | 10 |
| Rhizome AI | Agent Platform for Life Sciences | Active | 1 |
| Ritivel | Evals, RL environments and training data for creative tasks | Active | 3 |
| Robby | AI agents that grow revenue for home services businesses | Active | 3 |
| RoboDock | Robots that run autonomous depots for autonomous fleets. | Active | 4 |
| Rubric AI | Reasoning and verification infra for AI | Active | 1 |
| Ruma Care | Prior auths and benefits investigation for infusion clinics | Active | 5 |
| RunAnywhere | Fastest inference anywhere: open models on-prem, hosted or on-device | Active | 5 |
| Salus | Guardrails to validate your agent's actions before they execute | Active | 2 |
| Samora AI | Multilingual voice agents that outperform humans | Active | 8 |
| Scheduling Wizard | Logistics infrastructure to modernize healthcare operations | Active | 3 |
| Seeing Systems | Modular AI-Commanded Drones for Defence | Active | 7 |
| Sentrial | Datadog for Agent Reliability | Active | 2 |
| Sequence Markets | Low-latency execution across crypto, prediction, and tokenized assets | Active | 5 |
| Servo7 | Container unloading robots for warehouses | Active | 3 |
| Shofo | The World's Largest Video Library | Active | 4 |
| shortkit | Media infra for consumer apps | Active | 2 |
| SideKit | Consumer app studio. | Active | 2 |
| Signals | iMessage revenue channel for DTC brands that brings customers back | Active | 2 |
| Sila | Agentic Messenger | Active | 2 |
| Sitefire | Marketing suite for the agentic web | Active | 2 |
| Skillsync | Search your agent session history | Active | 2 |
| Sparkles | Make everyone on your team an engineer | Active | 2 |
| Sponge | Financial infrastructure for the agent economy | Active | 3 |
| SpotPay | Stablecoin Global Bank Account | Active | 2 |
| Squid | AI agents for power grid planning 🦑 | Active | 5 |
| Standard Physics | Fast Physics Simulations for Rapid Design and Real Time Control | Active | 2 |
| Stilta | Agentic AI for intellectual property | Active | 4 |
| Strand AI | Multimodal foundation models to predict uncollected patient biology | Active | 2 |
| Synthetic Sciences | Infrastructure for Autonomous Science | Active | 4 |
| Talking Computers | Real-time interaction models for voice agents | Active | 2 |
| TensorTest | Evals, RL environments and training data for creative tasks | Active | 3 |
| Tepali | AI EMR for medspas & wellness clinics | Active | 2 |
| Terminal Use | AI-native transformation for operations-heavy companies | Active | 4 |
| Terranox AI | The first AI-powered uranium discovery company | Active | 2 |
| The Token Company | Compression middleware that improves LLM outputs | Active | 2 |
| Traverse | Custom models and inference, built and run for enterprises | Active | 1 |
| Travo | . | Active | 4 |
| Turnstone | The best model-agnostic Grokbot alternative | Active | 3 |
| Unifold | Multi-chain deposit and payment infrastructure | Active | 3 |
| Unisson | AI agents that automate B2B software implementation | Active | 2 |
| Valgo | Insurance risk layer for physical AI | Active | 3 |
| Vector Legal | A premier AI-native law firm & legal operating system for Startups. | Active | 9 |
| Vela | AI Recruiting Coordinator for Executive Search | Active | 15 |
| Velum Labs | The OS for data quality across any stack | Active | 2 |
| Ventura | AI Workforce for Distributors and Manufacturers | Active | 2 |
| Verdex | AI Verification for Insurance | Active | 2 |
| Veriad | AI operating system for advertising | Active | 2 |
| Visibl Semiconductors | Custom silicon for power electronics | Active | 3 |
| Voltair | Autonomous Drones for Earth Observation | Active | 5 |
| Voxel Energy | Energy independent data centers with solar and repurposed batteries. | Active | 3 |
| VOYGR | The real-world intelligence and action layer | Active | — |
| Wayco | AI operator for medlegal cases | Active | 5 |
| Wideframe | AI coworker for video editors to ship more video faster | Active | 2 |
| Zatanna | Building the infrastructure for AI to interact with software | Active | 2 |
| ZeroSettle | Drop-in Direct Billing SDK for In-App Purchases | Active | 2 |
| Zymbly | The decision-support layer for aviation ops teams to know what to do… | Active | — |
| Klaus AI | Fast and Safe OpenClaw on the cloud | Inactive | 2 |
| Kyten Technologies | Custom Aerospace-Grade Battery Packs | Inactive | 2 |
| Mendral | AI DevOps Engineer | Inactive | 2 |
| Q2Q | We help private equity teams find acquisition targets faster | Inactive | 2 |
| Valence | Unified prediction markets trading platform | Inactive | 3 |
How this is measured
Measured 2026-11-10 from Y Combinator's company directory. Team size is the number YC lists for the company, where it lists one. Survival here means listed Active; Acquired and Public are shown separately because YC's listing does not say whether an acquisition was a good outcome.
All batchesShut-down companies
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