Companies169

Active96%

Acquired or public2%

Inactive2%

Y Combinator's directory lists 169 companies in the Winter 2025 batch: 162 Active, 4 Acquired, 0 Public and 3 Inactive. Winter 2025 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 2025

By the industry YC files each company under: B2B 108, Industrials 19, Fintech 12, Healthcare 11, Consumer 8, Education 5, Government 4, Real Estate and Construction 2.
Where 167 of the 169 companies say they are based, by the first location each lists: San Francisco, CA, USA (105), New York City, NY, USA (19), London, England, United Kingdom (7), Germany (3), Los Angeles, CA, USA (3), Stockholm, Stockholm County, Sweden (3), Austin, TX, USA (2), Paris, Île-de-France, France (2), and 21 other places.
Earlier names on the entries: .Wave (earlier Dollyglot); 10x (earlier GradeWIz); a0.dev (earlier Aura and Auraful); A1Base (earlier A101 and A1Zap by A1Base); A1Zap by A1Base (earlier A101 and A1Base); AfterQuery (earlier Cronus); Alice.tech (earlier Alice); Altrina (earlier Symmetric Labs, Tessa and General Agency); Amby Health (earlier Vertex Health); Archon (earlier NEXUS); Artil (earlier Fira); Asteroid (earlier Entropy Labs); AthenaHQ (earlier NewsPod and Otter Health); Bezel (earlier Replenish); Bild AI (earlier Comply AI and Bilds AI); and 70 more.
Status changes seen since tracking began on September 26, 2026: Olive, Active to Inactive (seen October 24, 2026); Bud, Active to Acquired (seen October 10, 2026).

Every company in Winter 2025

Company	What they do	Status	Team
.Wave	Inference for real-time AI	Active	2
10x	AI Sales Teams for Dental Practices	Active	3
a0.dev	We make mobile apps using AI.	Active	3
A1Base	The social network layer for AI apps	Active	2
A1Zap by A1Base	The social network layer for AI apps	Active	2
Adam	AI Powered CAD	Active	4
AfterQuery	Applied research lab curating data solutions for foundation model…	Active	30
Agentin AI	Foundational model research	Active	2
Alice.tech	AI-driven exam prep	Active	5
Amby Health	The health coach that texts you first	Active	2
Archon	We help software companies sell to government.	Active	3
Artifact	An Collaborative, AI-native IDE for Hardware Engineers	Active	4
Artificial Societies	Foundational model of human societies for consequential decisions	Active	18
Artil	Let your agents message teammates and other agents	Active	2
assistant-ui	Open Source React.js Library for AI Chat	Active	3
Asteroid	The integration layer for healthcare: EHRs, payer portals & more	Active	6
Astro	Power-ready land for AI data centers	Active	1
AthenaHQ	Be the Answer in AI Search - AI SEO across SEO, GEO & AEO	Active	12
awen	awen translates intent into exceptional visuals through conversation	Active	6
Axal	We assemble PCBs in under 48 hours for quantities under 10	Active	3
Axiom	Trade memecoins, perpetuals, and earn yield.	Active	2
Bezel	Digital AI humans that model clothes for e-commerce brands.	Active	1
Bild AI	AI estimating & detailing for Division 8 doors, frames & hardware	Active	9
Bindwell	Discovering new pesticides with AI	Active	24
BlindPay	Stablecoin API for global payments	Active	9
Bluebook	AI for accounting	Active	4
Browser Use	Agents that use the browser.	Active	5
Butter	Embedded Sandboxes for Agents	Active	2
Bystreet	Connect with hoteliers around the world.	Active	4
Calltree	Enterprise-grade AI support reps for call centers	Active	14
Candor	Protect your data and stop insider risk	Active	3
Candor	We help companies win government funding with AI	Active	2
Cardamon	AI compliance co-pilot for regulated financial businesses	Active	11
careCycle	Voice AI teams for medicare agencies.	Active	5
Caseflood.ai	How elite law firms do intake	Active	2
Cedar	Execute the best sales playbook in industry	Active	2
Cenote	AI agents for conversational commerce	Active	2
Cifrato	AI Accountant for Accounting Firms	Active	17
Closure	We help law enforcement solve crime	Active	11
Codevisor	The fastest native app for agentic engineering.	Active	2
Confident AI	Production Monitoring & Evals for AI Agents	Active	7
Conntour	Query mission-critical video	Active	20
Contrario	AI hiring platform powered by expert recruiters	Active	20
CopyCat AI	AI for Commercial Insurance Agencies	Active	4
Corsair	OpenRouter for Integrations	Active	2
Cuckoo Labs	Real-time AI translator for global sales and marketing	Active	2
Dalus	AI-Powered Hardware System Design Software	Active	3
Dartboard	AI-native remote operations center for hardware fleets	Active	2
Delineate	Agents for Accelerated Clinical Trial Design	Active	20
Dexto	AWS for AI Agents	Active	2
Edexia	AI Teacher Assistant for Grading Essays	Active	4
Elip AI	Cooking something sweet and salty!	Active	4
Enhanced Radar	AI systems for aviation	Active	12
Ergo	Ergo is the context layer that helps revenue teams close more deals.	Active	9
Excellence Learning	AI tutor starting with maths and science	Active	4
Exin Therapeutics	Agentic platform for predictive neuro drug discovery + data foundry.	Active	9
Exla	Building agents that reads logs and fixes issues on your behalf.	Active	2
finbar	Financial intelligence for every investor	Active	4
Fira	Let your agents message teammates and other agents	Active	4
Flowtel	The AI Voice agents for hotels	Active	5
Forge Automation	Software Enabled CNC Parts Supplier	Active	21
Fuse AI	Agentic Sales Platform	Active	12
G LNK	Simplifying Collaboration for Healthcare Organizations & Professionals	Active	2
Gale	Fast and Data-Driven Immigration Platform	Active	3
General Trajectory	AI for the physical world	Active	1
Harbera	AI Healthcare Provider Credentialing Software	Active	2
Harper	AI-native commercial insurance brokerage	Active	25
HealthKey	AI-powered Patient Identification for Clinical Trials	Active	10
Hey Telo	Voice AI for Home Services	Active	2
HUD	Platform and marketplace for RL environments and AI data	Active	24
Infinite	Global B2B Stablecoin Processor	Active	4
Instinct Space	Building lunar landers	Active	5
Inversion Semiconductor	Manufacturing the most powerful chips, 15x faster	Active	9
Invo	infra for computer use agents	Active	1
Karoo	AI native consumer lending platform for underserved Americans	Active	3
Karsa	Stablecoin neobank for emerging markets	Active	2
Ladder	AI personal assistant for in-home sales	Active	2
Leaping AI	AI voice and texting agents	Active	13
Liquid Compute	Pending CFTC regulation to be the first cash and physically settled…	Active	5
Lopus	Headless Data Team	Active	2
Lucid	interactive video models	Active	3
Lucidic AI	Reimagining how Machines Learn	Active	—
Macadamia	AI Agents for Complex Engineering Projects	Active	2
Maive	AI personal assistant for in-home sales	Active	2
Maritime Fusion	Fusion reactors for ships	Active	6
Mastra	The Javascript framework for building AI agents, from the Gatsby devs	Active	30
Mecha Health	Foundation models to automate x-ray analysis for radiologists	Active	4
Mentra	Building the open source smart glasses operating system.	Active	12
Mercura	AI quote & order processing for technical distributors & manufacturers	Active	20
Mesh	Eliminating accrual spreadsheets for faster month-end	Active	3
Misprint	Misprint is building Robinhood for Pokemon cards	Active	4
Miyagi Labs	AI tutors for exam prep	Active	2
Mosaic	Frontier Video Agents	Active	5
Mundo AI	The data layer for perceptual intelligence	Active	30
Nitrode	Frontier AI research to advance game development	Active	8
Oki	The memory computer for your digital life.	Active	6
Onlook	The Developer tool for Designers	Active	4
OpenIntake	The AI Front Door For Law Firms	Active	2
Operand		Active	8
Optifye.ai	AI performance monitoring for factory workers	Active	12
Orbital Operations	High Thrust Space Vehicles for Satellite Defense	Active	10
Osmosis	Reinforcement Learning (RL) for AI Agents	Active	6
Outlit	Protect and Grow Long-tail Revenue	Active	3
Outship	Hire amazing engineers by seeing how they use AI	Active	3
Overstand Labs	Navigate any set of data - no matter how large - in minutes.	Active	4
Ovlo	Founder led hiring for London startups	Active	2
Paragon	The AI Growth Engine for Industrials	Active	2
Paratus Health	healthcare AI	Active	4
Pave Robotics	Robots that repair roads	Active	3
PAX Markets	Co-located trading facility and matching engine on one chip.	Active	6
Peppr AI	In-call AI teleprompter that helps reps close enterprise deals	Active	4
Permitify	AI co-pilot for building plan review and building code compliance	Active	2
Pickle	The personal AI agent network for Asia	Active	6
Pinch	AI Voice Translation for live conversations or media	Active	3
Praxim	The agentic AI Word editor	Active	2
Proception Inc	Making humanoids dexterous enough to thread a needle	Active	10
Promptless	An AI teammate that automatically updates your customer-facing docs	Active	5
Quantstruct	AI documentation engineer – test & autoimprove stale product docs	Active	2
Rally	Financial OS for Modern Fleets	Active	5
Rebolt	Agentic AI for aircraft maintenance	Active	3
Red Barn Robotics	A Roomba for weeds on a farm.	Active	5
Reditus Space	Reusable Satellites	Active	12
ReJot	We turn complex API integrations into drop‑in full‑stack libraries	Active	2
Retrofit	A vintage marketplace curated by AI	Active	2
Revise Robotics	Automating refurbishment of $1T in consumer electronics	Active	3
Riviera	AI Employees for Hotels	Active	2
Roark	Test, monitor, and improve your voice agents	Active	3
Rocketable	The AI Maximalist Software Holding Company	Active	2
SalesPatriot	Supply chain superintelligence for distribution and procurement	Active	30
SAMMY Labs	Computational Law	Active	10
Scout	AI-powered student information system for K-12 schools	Active	8
Sennu AI	We turn traditional companies into AI companies	Active	2
Sherpa Labs	Frontier Data	Active	5
Solidroad	AI agents for CX teams, starting with training and QA.	Active	6
Splash Inc.	Autonomous patrol-boats for National Security	Active	9
Spott	AI-native ATS/CRM for recruiting firms	Active	50
Stamp	The AI Secretary for Email and Calendar.	Active	1
Steinmetz	Next-Generation Power Electronics	Active	5
Stillwind	PCB component librarian	Active	3
SubImage	The Open-Core Security Graph	Active	4
Subtrace	Zero code network tracer	Active	2
superglue	AI agents that run ERP implementations for consultants	Active	6
Swerve	AI Chat & Stories	Active	2
TamLabs	Agent teams for complex work	Active	2
Tergle	AI Agents for Audit	Active	—
Thirdlayer	Continual learning for enterprise AI	Active	2
Toothy AI	AI for insurance verification & billing at dental clinics	Active	15
TrainLoop	Reasoning Fine-Tuning	Active	6
Trata	AI-powered research desk for hedge funds	Active	6
Trava	AI agents for global trade compliance	Active	1
Trim	A foundation model for physics.	Active	3
Tweeks.io	Lovable for Chrome Plugins	Active	2
Uncommon Therapeutics	A Disease Focused Biotech, Building Multiple Billion Dollar Drugs	Active	2
Vantel	AI Platform for Commercial Insurance Brokerages	Active	5
Verbiflow	Outbound Sequencing Infrastructure for Startups	Active	2
Vetnio	AI Copilot that automates admin work for veterinary professionals	Active	6
Vocality Health	Voice AI for medical language translation	Active	2
Waypoint Transit	We automate urban planning so cities can build cheaper and faster.	Active	2
Weave	AI to understand and then route engineering work	Active	16
Wildcard	AEO/GEO for E-Commerce and Retail	Active	—
Woz	Claude Code plugin that reduces token consumption and cost by 50%	Active	8
YouShift	The OS for hospital workforce management	Active	10
Bud	Agent with a computer	Acquired	6
Egress Health	Automated revenue cycle management, starting with dentists	Acquired	2
TensorPool	Vercel For GPUs	Acquired	3
ZeroEntropy	Artificial Specialized Intelligence	Acquired	6
Altrina	The SOP Automation Platform	Inactive	4
Olive	Build internal tools with AI	Inactive	2
Sublingual	Daily productivity tracker	Inactive	2

Company records kept on this page

These companies had a page of their own. Each held too little that was its own to stand alone, so everything it said is kept here, line by line with the record it came from, and the old address leads to this section.

Invo

Invo describes itself on its directory entry as: “infra for computer use agents.” (source)
Invo is listed in the Winter 2025 batch, added to the directory on 2025-02-13, with the status Active. (source)
The entry gives a team of 1 and stage “Early”. (source)
Industry: B2B. (source)
Earlier names on the entry: Radah, Rada. (source)
Website given on the entry: www.tryinvo.com.
When we read www.tryinvo.com directly on 2026-09-27, it answered 200 with the page title “Invo - Fast Collections”. (source)

Paratus Health

Paratus Health describes itself on its directory entry as: “Voice agents for outpatient facilities.” (source)
Paratus Health is listed in the Winter 2025 batch, added to the directory on 2025-02-19, with the status Active. (source)
The entry gives a team of 4 and stage “Early”. (source)
Industry: Healthcare › Healthcare IT. Sectors: Sales, Sales Enablement, Digital Health, Healthcare IT. (source)
Based in New York City, NY, USA. (source)
Earlier names on the entry: Paratus. (source)
Website given on the entry: paratushealth.com.
When we read www.paratushealth.com directly on 2026-09-27, it answered 200 with the page title “Paratus Health | Gen AI built for healthcare phone lines”. (source)
Pablo Bermudez-Canete, Founder/CEO, is named as a founder on the entry. (source)
Tannen Hall, Founder/CTO, is named as a founder on the entry. (source)

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.

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What happened to YC Winter 2025