Companies146

Active53%

Acquired or public21%

Inactive27%

Y Combinator's directory lists 146 companies in the Winter 2018 batch: 77 Active, 29 Acquired, 1 Public and 39 Inactive. 27% of Winter 2018 is listed Inactive, against 23% across YC batches at least two years old, so this batch has lost more companies than most.

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 2018

By the industry YC files each company under: B2B 55, Consumer 35, Healthcare 28, Fintech 11, Industrials 8, Education 4, Real Estate and Construction 3, Government 2.
Where 142 of the 146 companies say they are based, by the first location each lists: San Francisco, CA, USA (56), San Francisco (14), New York City, NY (9), London, England, United Kingdom (6), Toronto, ON, Canada (5), New York City, NY, USA (4), Boston (3), Boston, MA, USA (3), and 32 other places.
YC marks 4 companies from this batch as top companies: Bear Flag Robotics, Groww, Newfront and Sqreen.
Earlier names on the entries: Acely (earlier Juni Learning and Juni); Anjuna (earlier Anjuna Security); Assembly (earlier Piccolo, Portal and Copilot); Ben (earlier Benjamin); BioRender (earlier BioRender.io); Blueberry Pediatrics (earlier SparkMD Inc., SparkMD and Blueberry Medical); California Dreamin (earlier Seven Cities Beverage Company); Closer Sports (earlier DeepMed); Cognition IP (earlier Vertical Law); CoinTracker (earlier Nino Finance and Inc.); Culture Biosciences (earlier Culture Robotics); Dataform (earlier Tada analytics); Dear Brightly (earlier DermaLoop and DearBrightly); Draftbit (earlier Orchard); Edwin (earlier Edwin.ai); and 61 more.
Status changes seen since tracking began on September 26, 2026: SharpestMinds, Acquired to Inactive (seen November 4, 2026); Universe, Active to Inactive (seen October 22, 2026).

Every company in Winter 2018

Company	What they do	Status	Team
Acely	Every student's AI coach for college readiness	Active	30
Aerones	Robotics for wind turbine maintenance.	Active	250
AesculaTech	Responsive materials, better lives.	Active	6
AlgoSurg Inc	Surgical AI for medical device companies: Patient scan to robot-ready…	Active	3
Anjuna	Anjuna enabled organizations to trust any infrastructure	Active	55
ArchForm	Replacing orthodontic braces with our clear aligner and software	Active	23
Aspire	All-in-one Finance OS for businesses	Active	500
Assembly	Create remarkable client experiences	Active	25
Avro Life Science	Skin patches for generic drug delivery.	Active	8
Beanstalk	Great tasting produce, farmed around the corner	Active	15
Biobot Analytics	Population health analytics powered by wastewater.	Active	12
BioRender	'Figma/Canva for scientists’	Active	250
Blueberry Pediatrics	24/7 pediatric clinic in every family's living room	Active	15
CaptivateIQ	Agile commission software to design, deploy & adapt commission plans.	Active	280
Cognition IP	Flat-fee patent & trademark counsel with top firm results	Active	12
CoinTracker	The gold standard in cryptocurrency portfolio tracking and taxes	Active	70
Culture Biosciences	We grow cells for biotech companies.	Active	40
Draftbit	Build mobile apps, web apps, and games with AI. Start for free.	Active	10
ErudiFi	Digital financial services for students in Southeast Asia	Active	88
Evolve (makers of Podcast App & Rest)	Rest is an AI sleep coach that helps you fix your sleep for good,…	Active	23
FidoCure®	FidoCure® is the leader in Precision Medicine for Canine Oncology.	Active	14
Fondo	Bookkeeping, tax, & tax credits on autopilot for 2,000+ startups	Active	80
Gainful	Personalized Performance Nutrition	Active	30
Glowing.io	Unified, enterprise messaging platform for leading brands of the world	Active	11
Helloverify	Helloverify is a background screening platform (Checkr for India).	Active	600
Jasper.ai	Jasper is a leader in creating content using Artificial Intelligence	Active	195
Key Values	Helping software developers find teams that share their values.	Active	1
Let's Do This	The online company that gets everyone offline	Active	75
Lucy Goods, Inc	Lucy’s mission is to reduce tobacco-related harm to zero. We provide…	Active	7
LUS Brands	Hair care products for curly hair.	Active	20
Macromoltek	Computational antibody design	Active	14
Meitre	Opentable for the world's top restaurants; we help them increase…	Active	9
Mind Emulation Foundation		Active	1
Modern Health	A mental health benefits platform for employers.	Active	375
Nectome	Human whole body end-of-life preservation for later revival.	Active	9
NEXGENT		Active	25
Nuvocargo	Your AI partner for North America truckload freight	Active	100
Observant AI	iPhone-based driver monitoring for commercial fleets.	Active	5
Observe.AI	Contact center AI platform.	Active	240
OpenSea	This isn't just a marketplace; we're shaping the future of digital…	Active	75
Orangewood Labs	Orangewood builds amazing robots that people want.	Active	8
Pelago	The world's first digital clinic for substance use management	Active	180
Persephone Biosciences	We are using the gut microbiome to end cancer.	Active	6
Players' Lounge	Win money betting on yourself playing AAA video games	Active	13
Plexus	High-performance gloves for VR and AR	Active	3
Precious	AI to curate your baby photos	Active	7
Promise	Better payment systems for governments and the communities they serve.	Active	80
Proven Group	PROVEN is using AI, data and personalization to disrupt CPG	Active	40
Psylaris	Psychotherapy through autonomous and personalized VR-sessions.	Active	23
Quantstamp	Security auditing for Web3	Active	80
Replit	Collaborative in-browser IDE	Active	65
Runa	Automating payroll for Latin America.	Active	100
SafetyWing	Health insurance for remote teams	Active	130
Shogun	Shogun empowers brands to create exceptional ecommerce experience.	Active	90
Simetrik	No code enterprise SaaS for financial control automation.	Active	350
Sixfold Bioscience	Delivering RNA therapies.	Active	27
Slite	The self-maintaining knowledge base	Active	40
Snackpass	Order ahead at restaurants and get rewards with friends.	Active	38
Sourcify	Sourcify helps brands manufacture products in Asia.	Active	15
Spellbrush	Making Anime Real	Active	30
SRTX	Powering a better future for textiles.	Active	150
Substack	A place for independent writing.	Active	90
Super	Super is the first and leading Indonesian social commerce platform	Active	1037
Supermedium	VR space of immersive utilities	Active	2
Swayable	Swayable predicts consumer opinion and the impact of content	Active	30
Tarjimly (acquired)	Translating for Humanity	Active	20
tEQuitable	tEQuitable's mission is to create work culture that works for everyone	Active	6
Tilt (f.k.a. Delphia)	GitHub for Investment Methodology	Active	25
Tradewind BioScience	Tradewind translates scientific insight into innovative ways of…	Active	2
Treasury Prime	Embedded banking software platform and marketplace	Active	100
Tributi	Tax filing automation for individuals in Latam.	Active	20
Vanta	Vanta—the proven leader in automated compliance helping startups…	Active	700
Vena Medical	Vena Medical is providing physicians with the world's smallest camera…	Active	7
Veriff	Veriff is a global AI-native identity platform building trust online	Active	600
Weekend (fmr. Volley)	AI games and entertainment on TV	Active	80
Worklytics	Analytics to improve how teams work and collaborate	Active	—
ZBiotics	ZBiotics makes genetically engineered probiotics.	Active	22
Bear Flag Robotics	Autonomous driving technology for farm tractors.	Acquired	10
ClearBrain	Causal Analytics for Growth Teams	Acquired	10
CodeStream	CodeStream is a Developer Collaboration Platform designed to…	Acquired	10
Dataform	Manage data in Snowflake, BigQuery, and Redshift	Acquired	10
Dear Brightly	Dear Brightly makes personalized prescription skincare products,…	Acquired	3
Edwin	Edwin is virtual English tutor - an AI-powered service for learning…	Acquired	14
Evry Health	Better health insurance for mid-size companies	Acquired	87
Flinto	Mexico's digital wallet	Acquired	—
Glimpse K12	Glimpse eliminates ineffective spending in schools.	Acquired	6
Hunter2	Hunter2 trains engineering teams in application security through…	Acquired	—
Jido Maps	Turn your data into a deployed computer vision model	Acquired	6
Lawyaw	Automating document-based workflows	Acquired	15
Look After My Bills	Personal fintech - we optimise your bills, every year, automatically.	Acquired	2
Mayhem	Mayhem is the easiest way to play with your gaming community.	Acquired	10
Medumo	We manage patient instructions for hospitals	Acquired	12
Memora Health	Digitize and Automate Complex Care Workflows	Acquired	115
Mojo	Mobile app for creating pro-quality social media videos	Acquired	20
Naborly	A credit bureau for the renting generation.	Acquired	25
NewCraft	Universal API for HR & Payroll	Acquired	2
Newfront	Modern insurance brokerage.	Acquired	800
onederful	Dental Insurance API	Acquired	2
Pulse	We're crowdsourced Gartner so IT executives can learn directly from…	Acquired	11
Qulture.Rocks	The people, management, and culture operating system for your startup.	Acquired	70
Sepsis Scout	Wearables and AI to predict and prevent sepsis outside the hospital	Acquired	5
Sqreen	Sqreen is the application security platform for the modern enterprise	Acquired	120
Squad	Squad is an app for live communities to have shared experiences…	Acquired	10
Swipehouse	Meet other creators. Get daily matches. Find brand deals.	Acquired	5
YouTeam	We make it easy for startups to hire engineers.	Acquired	34
Zyper	Recreating social networks for brands.	Acquired	35
Groww	Making financial services simple, transparent and delightful.	Public	1050
Aalo	Lego-like furniture for design geeks. We create furniture that's…	Inactive	1
Atrium	Modern law firm for startups powered by proprietary technology	Inactive	180
Ben	The easiest way to learn about, buy, and store cryptocurrency.	Inactive	2
California Dreamin	Cannabis infused beverages	Inactive	2
Closer Sports	Mobile streaming platform connecting professional athletes with their…	Inactive	2
Correlia Biosystems	Next-gen blood testing to provide 1000x more data to pharma companies	Inactive	16
Curious Fictions	Patreon for professional authors.	Inactive	2
EnvKey	End-to-end encrypted configuration and secrets management	Inactive	2
Haiku	Collaboration tools for software companies	Inactive	—
Hexel	Create a cryptocurrency for your community.	Inactive	2
Iambiq Technologies		Inactive	2
Lambda Tea	We build self-serve bubble tea dispensers! :D	Inactive	2
Meson	Meson is a stablecoin swap protocol among blockchains and Layer 2s	Inactive	10
Mighty Buildings	3D printing beautiful, high-quality, and sustainable homes.	Inactive	200
miru	Experience any piece of furniture in AR	Inactive	1
Necto	ISP starter kit	Inactive	4
Nutrigene	Personalized liquid supplements based your health data	Inactive	—
Openland	Messenger for communities	Inactive	14
OSIMple	Software for inspectors to automate their paper workflow.	Inactive	2
OurMenu		Inactive	3
Ovipost	Automated insect farming	Inactive	20
Pagedraw	Pagedraw is a platform for productionizing designs into code. Thanks…	Inactive	5
Point API	Point stores things you send over and over again and helps you re-use…	Inactive	5
Reverie Labs	Engineering next-generation, brain-penetrant cancer therapies.	Inactive	29
Rhythmm	Read interesting conversations	Inactive	2
Secured	Tools for Sneaker, NFT & web3 investors	Inactive	12
SharpestMinds	Peer-to-peer mentorships through income-share agreements.	Inactive	4
Shone	Shone makes existing cargo ships autonomous through retrofit.	Inactive	8
Sketchbox	Wordpress for AR & VR	Inactive	20
Skip	Electric scooters for reliable last-mile transportation.	Inactive	2
Station	Your team’s automated knowledge base	Inactive	9
Storyline	Create Alexa Skills without coding	Inactive	3
Tingles	Find content that helps you relax and fall asleep.	Inactive	6
Tipe	Open-source, customizable, headless CMS	Inactive	5
Torch		Inactive	130
Universe	Design and build any kind of website. On your iPhone or iPad.	Inactive	25
Vathys	Accelerating machine learning through software	Inactive	6
Viaopt	Uber pool for corporate trucking fleets	Inactive	2
Voicery	Automated voice acting and emotive speech synthesis with deep neural…	Inactive	2

Company records kept on this page

This company had a page of its own. It 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.

Hunter2

Hunter2 describes itself on its directory entry as: “Hunter2 teaches modern appsec to engineering teams through interactive labs. Developers get hands-on practice exploiting and patching real web apps written in their tech stack.” (source)
Hunter2 is listed in the Winter 2018 batch, added to the directory on 2017-11-08, with the status Acquired. (source)
The entry gives stage “Early”. (source)
Industry: B2B › Security. Sectors: Developer Tools, Education, Cybersecurity. (source)
Based in Boston, MA, USA. (source)
Website given on the entry: hunter2.com.
Fletcher Heisler, Founder, 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.

All batches Shut-down companies

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What happened to YC Winter 2018