YC S23 Batch List 2026: All 219 Companies + Free CSV

The full YC Summer 2023 (S23) batch list: all 219 still-listed companies with one-liners, websites and team sizes, grouped by industry (B2B 152, Healthcare 28, Fintech 16), plus a free CSV.
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the short answer
The YC Summer 2023 (S23) batch has 219 still-listed companies, weighted heavily to B2B software (152), then Healthcare (28) and Fintech (16). The full list with one-liners, websites and team sizes is grouped by industry, and the whole batch is available as a free CSV download.
YC S23 at a glance: Summer 2023 was the batch where AI took over Y Combinator - 229 startups funded from 24,000+ applications, under 1% accepted, and roughly 69% building B2B software, most of it AI-native. This page has the full list of all 219 still-listed S23 companies (grouped by industry, each linked), the batch stats, and a free CSV of all 219.
229
companies funded
24k+
applications
<1%
accepted
69%
B2B / AI-heavy

Summer 2023 was the batch where AI took over YC - and this is the complete roster. Every listed company, what it does, its industry, and a direct link, grouped so you can jump straight to your sector. Want it in a spreadsheet? Download the CSV and sort it yourself.

The full YC S23 company list (all 219, by industry)

All 219 currently-listed Summer 2023 companies, pulled from Y Combinator's own company data and grouped by industry, with a live link on each name. (YC funded 229; the difference is companies now delisted or gone stealth.) Use the jump links or Ctrl/Cmd+F to find one fast.

Company
What it does
Team
B2B · 152 companies
A compliance training platform built for regulated industries.
2
Connect every disconnected app to your SSO.
6
Wholesale marketplace for food & beverage
10
AI sales prospecting. Replace your SDR with AiSDR
5
Superhuman video production as a service
12
AI-Native CPQ & Billing for Modern Pricing Models
10
Simpler and cheaper multi-cloud and cross-platform deployments.
2
A stream of engineering candidates who ship.
2
Software that streams data from databases to warehouses in real-time
16
The improvement engine for AI agents
10
Infuse knowledge into language models with just 10 samples
3
AI agents reliable enough to do real work
2
Observability and evaluation platform for LLM apps.
2
The enterprise platform for AI phone calls
65
AI Powered All-In-One Payroll, HR + Recruiting
14
AI Overview Search, as a Service
3
The collaborative data platform.
2
AI for ASIC Design Verification
5
AI Teammate to Enable Every Knowledge Worker to Be a Top Performer
3
The AI Native ERP for the fastest growing companies.
105
Headcount & Compensation Management
4
Build your GTM workforce
6
AI agents that automate AP, procurement, and finance
6
Fast, reliable, reproducible AI with GPU live migration
5
AI for legal & government
2
AI powered HR and Recruitment for people teams
28
Dead simple LLM testing and iteration
2
Aide is an AI-native , privacy-first IDE built on top of VSCode
4
Pioneering open-source coding agent
AI voice agents for healthcare operational calls
2
All-in-one marketing measurement for B2C
6
Your AI butler that understands you really well and proactively acts…
3
Corgea finds, and fixes insecure code and packages autonomously.
6
Inventory Management and POS for the Wine industry
3
Embed charts, dashboards and exports in your app
1
Metadata for GenAI workflows
8
AI Agents for Enterprises
2
Automating PWA Compliance and Diligence
15
Web, Desktop, and Mobile apps with one codebase in Rust
4
Automate your chargebacks with AI agents
2
AI contract repository
4
AI Customer Service Agents for trades and field services
20
All-in-one platform to create AI agents with your private knowledge
3
Banking + Payroll/Benefits + Bookkeeping + Tax in one place
12
The freshest data APIs for AI sales, recruiting, & growth products
8
AI enabled marketplace matching trucks with jobs
20
Open source GenAI development platform
5
Turn manual operations into scalable processes
2
AI Support Agent for Enterprises.
30
Build games at the speed of thought
3
Automating Data Entry for Clinical Trials
4
Crypto Deposits, Wallet Funding, and Pay-with-crypto Infra
4
Affordable carbon tracking solution for all businesses
2
AI-powered forecasting & replenishment for grocery
7
Intelligence that runs your operations.
80
Open source tools for developing generative AI applications
2
Your first security hire
2
The operating system for inbound B2B revenue
65
Revenue Activation Platform
30
Your junior AI product manager
2
Build chat-with-data agents for customer-facing applications
2
AI timekeeping for legal professionals.
2
AI Agents For RFP and Questionnaire Response Automation
12
The fastest way to build AI assistants on technical content
22
Kino is an AI media manager and video editor for humans and agents.
4
Screen recorder for stunning product demo videos
2
AI-powered risk and compliance for financial institutions
12
The all-in-one AI platform for companies.
50
AI Energy Management
2
Empowering B2B sellers with AI-powered training, coaching, and content
12
AI-native customer support platform
2
AI Copilot for Shippers, Carriers and Brokers
3
Incentives and financing for energy efficiency upgrades
3
The World's First Multi-Agent System for Procurement
80
Revenue intelligence platforms for startups
2
Program computers with natural language
2
Drive leads with SEO and AEO.
15
AI Supply Chain Coordinator
2
Transform scientific data into discoveries
7
POS & operating system that makes liquor stores more money
10
The AI Platform for Life Sciences Intelligence
10
Firmware cybersecurity
4
AI SRE For Teams on Kubernetes
Turn product features into launch videos
1
Cursor for AI Agents
2
Build and publish web apps in minutes. No coding required.
7
Fast Models Optimized for Coding Agents
3
Your e-commerce brand's product quality control department.
8
AI-native platform for corporate meetings and events
9
Intelligent meeting automation for ambitious teams.
Turn expensive prompts into cheap fine-tuned models
2
Specialized agents for real work
1
The API for LLM tool use
3
Tracking methane emissions with satellites
6
Speed up materials innovation with Artificial Intelligence
2
AI-powered user interviews
30
Simple, Elastic-quality search for Postgres
10
Test, evaluate & observe your LLM applications
2
Fast, native ETL for Postgres 🐘 🚀
2
Close deals faster with AI for contract negotiation
4
AI Phone Agents for Healthcare Operations
9
Agentive assurance system for auditors, risk consultants, and clients.
6
RankAI grows your website on autopilot
3
The open source Postman alternative.
2
Open-source Retool for enterprise
10
Build a website by chatting with AI
2
AI-Powered Customer Segmentation for eCommerce
3
The simplest way to extract web data at scale
1
Low-false-positive intrusion detection for remote outdoor sites
1
Proof of Human - invisible human verification
4
AI agents for risk, compliance, and safety
10
All-in-one POS for liquor stores
10
iMessage for Sales
50
Your 24/7 AI Recruiter
8
The GPU Cloud Marketplace
11
AI research lab for retrieval
4
Meeting follow-up, automated
3
The copilot for chip designers
8
Open Source AI Agent to automate browser workflows via an API
10
Send texts your customers actually want over RCS
4
Copilot for Robotic Process Automation
5
AI patent drafting, prosecution, litigation and more for legal teams.
43
Manage a swarm of AI agents to get real work done
7
AI agents that run insurance operations
18
The publishing layer for the agentic internet
5
AI-driven Retention Automation for subscription media businesses.
7
orchestrate your coding agents with sudocode
2
Building the AI-powered marketing ops platform that turns website…
6
The best AI coding assistant for JetBrains
4
AI for Government Contracting.
10
Supercharging Sales
4
Event extraction for Medical Researchers
3
Visual Editor for React, powered by AI
8
Plaid for Telematics Data in Commercial Trucking
13
AI-powered Infrastructure as Code PR reviews
3
The open-source document editor for humans and AI agents.
19
Infrastructure for managing GPU clusters for training/serving.
3
A construction payroll platform designed for same-day pay.
30
The UI toolkit for Dashboards
2
We show couriers where to park and enter a building.
5
Open Source CRM
11
ai revenue engine for service businesses
6
The right leads at the right time for B2B sales
6
The first inbox designed for humans and agents
7
Development platform that makes it 10x easier to improve visual models
2
AI Operating System for Private Market Investors
30
The compliant AI colleague for sales teams in Europe
7
AI Scribe for veterinarians. Saving time and improving patient care.
25
Data to insights in seconds
2
AI-powered McKinsey-quality reports in seconds
3
Close your outdated dependency attack vector
3
The Data Platform for Mission‑Critical Systems
3
Healthcare · 28 companies
Autonomous surgical robots
10
AI Agents for Healthcare RCM
6
Get Paid for Family Caregiving
2
Marketplace to book doctors and avoid surprise bills
2
AI revenue recovery for underpaid healthcare claims.
3
The all-in-one EMR built for med spas and elective care
15
ML to predict and prevent pregnancy complications
2
Don't die of heart disease. Empirical is the first AI-native heart…
4
TurboTax for Medicaid
15
Using generative AI to call insurance for healthcare clinics
4
Navigating patients to the right place, first time.
40
The only patient engagement software that pays you.
2
Virtual Care for Type 2 Diabetes Reversal
9
Search engine for trustworthy medical information.
6
Higher resolution MRI with faster scan times.
2
Deliver genes to any cell with AI
5
Engineering a future without cancer deaths.
18
CRM Co-Pilot for Medtech Sales
2
Combination therapeutics for the world's toughest diseases
5
AI-Powered Medical Billing
3
AI Compliance Platform for Healthcare Organizations
20
Making it simpler for medical clinics to work with insurance
4
Root cause help for chronic conditions
1
AI calling & browser agents for healthcare
2
We get patients to their next appointment
5
AI-powered insurance verification to boost patient conversion.
8
We help people with chronic insomnia sleep better, using psychology.
5
AI Voice and SMS Agents for Healthcare
3
Fintech · 16 companies
AI agents for commercial underwriting at banks and fintechs
18
B2B debt collection powered by AI agents
42
AI-native operations for the banks
34
Helping businesses in emerging markets make pay their international…
40
Automating lenders' interactions with the DMV
6
Make Banking Magical
40
The AI-powered risk decision platform
5
India's first UPI wallet for foreign nationals and NRIs
15
Dual Currency Accounts For LatAm
9
AI agents for fintech risk and compliance operations
10
Claims infrastructure for African health insurance
28
Budgeting app with built-in banking
2
Stripe for HSA/FSA payments
8
Recover payment failures and maximize subscription Revenue
2
Low cost securities-backed lending for financial advisors and HNWI
15
Digital banking platform for the 30 million smartphone users in DRC.
2
Consumer · 9 companies
Asset Light Chipotle for Africa
AI for humans
2
Earn and redeem credit card points for free flights
5
Marketplace for Rare Coins & Precious Metals
10
Learn language with real-world content, at your level
3
Flight search engine using credit card points and miles
2
Long-horizon research agents
2
Play your story
5
Real Estate and Construction · 6 companies
Building the next Procore
6
Digital-native home painting franchise
50
Tech-enabled heat pump contractor that cuts costs by 60%
18
Shopify for Homebuilders
4
The AI platform for CRE investment teams
3
Instant 3D Digital Twins for Smarter Real Estate.
3
Industrials · 5 companies
AI back office for food product quality teams
2
Farm Genetics Made Easy - Using DNA and Software
5
Small unmanned hydrogen airships for long range monitoring
22
Manage energy cost & usage with AI for facility & sustainability teams
7
Genetically engineering plants for disease resistance.
2
Education · 3 companies
Personalized learning built for schools
18
The AI Platform for Medical Education
3
An AI math tutor for every student
4

Prefer YC's interface? Open the official S23 directory to filter by region and team size.

S23 by industry

Counted directly from the 219-company list above - not rounded press figures:

B2B
152
Healthcare
28
Fintech
16
Consumer
9
Real Estate and Construction
6
Industrials
5
Education
3

S23 by the numbers

The official batch stats, from Y Combinator and Demo Day coverage:

Metric
S23
Companies funded
229 (219 still listed)
Applications
24,000+
Acceptance rate
Under 1%
Started with no revenue
75%
Never raised before YC
81%
Companies with a woman founder
15%
Format
First fully in-person batch in 3+ years

The S23 story: the batch where AI took over

S23 was the AI inflection point. B2B software made up more than two-thirds of the batch, and a huge share of it was AI-native: agents, coding assistants, and AI-powered data tools dominate the list above. Dev tools became the new fintech as the second-biggest theme, while classic fintech shrank to just 16 companies. If you want the cleanest seed-stage snapshot of where the current AI wave started, this is it.

 

The other throughline: S23 shipped fast and shipped in public. Companies like Twenty (open-source CRM), Skyvern (AI browser automation), and Continue (AI code assistants) broke out by launching with a Show HN and a working demo the day they went live - the founders who stood out could show the product running, not just describe it.

What the S23 breakouts had in common: Twenty, Skyvern, and Continue all led with a working demo, not a deck - the way standout teams win Demo Day. If you are launching, that is the asset to nail. Flowjam makes launch-ready demo videos, or do it yourself with our launch playbook and AI video generator guide.

How to use this list

  • Founders benchmarking: jump to your industry to see who else got funded there and how crowded it was - B2B/AI dev tools were packed, consumer and education were wide open.
  • Job seekers: S23 companies are ~2 years in, past the riskiest phase but still early. Download the CSV for a ready-made target list of all 219 with websites.
  • Investors and researchers: the CSV is sortable by industry and status - a clean starting dataset for the whole batch.
  • Applying to YC yourself? S23's bar - shipped product, real velocity - is the same one that gets you in today. See our YC application tips.

Frequently asked questions

How many companies were in the YC S23 batch?
Y Combinator funded 229 companies in Summer 2023 from over 24,000 applications - the largest batch in YC history at the time, at an acceptance rate under 1%. 219 are still publicly listed; the rest have delisted or gone stealth.

 

Is there a downloadable list of YC S23 companies?
Yes. Download the full CSV of all 219 S23 companies with descriptions, industries, and website links, or open the official YC S23 directory.

 

What were the biggest sectors in S23?
B2B/SaaS dominated at 69% (152 companies), followed by healthcare (28), fintech (16), and consumer (9). AI cut across nearly all of them.

 

Which S23 companies are worth knowing?
Standouts include Twenty (open-source CRM), Skyvern (AI browser automation), Continue (custom AI code assistants), HockeyStack (B2B revenue analytics), OpenPipe (fine-tuned model replacements), and Flex (HSA/FSA payments). The full list is above.

 

How selective was S23?
Under 1% - the lowest acceptance rate in YC history at the time, with 229 funded from 24,000+ applications.

 

Where does this list come from?
The company data is pulled from Y Combinator's own public company dataset and verified, so names, descriptions, and links are accurate rather than scraped guesses.

 

Related reads: YC Application Tips 2026 · YC Startup Directory · a16z Speedrun: How to Get In