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Fastest growing W23 companies

The 73 YC W23 companies whose team grew the most in the last 6 months (active companies with 10+ people).

Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.

Showing 73 of 73 companies on this list
#CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
1
Call every LLM API like it's OpenAI [100+ LLMs]
26+100%+333%1
2
AI workforce for property management
11+83%+120%YC$500KYC investment$500K, Apr 2023
3
AI-native Employee Management Platform for High-Growth Companies
87+61%+200%11$85MSeries B$60M, Jun 2026
4
Security infrastructure for developers and agents
49+58%+133%11$18.9MSeries A$16M, Jun 2025
5
Pierre is a new, opinionated, git platform.
23+53%+77%0SeedJan 2025
6
Enabling birth & postpartum doulas to easily accept insurance.
21+50%+75%0SeedJan 2026
7
A new kind of creative company.
12+50%+71%YC$500KYC investment$500K, May 2023
8
Empowering every doctor and every patient to participate in research
12+50%+50%0$1MSeed$1M, Apr 2023
9
AI for corporate tax
106+49%+74%1$43.5MSeries B$31M, Feb 2026
10
Medical language models to automate healthcare operations
137+47%+198%24$93.5MSeries A$80M, Mar 2026
11
Automating Healthcare Revenue Cycle Management with AI Workforce
19+46%+27%0SeedJan 2026
12
Magically simplify accounting and taxes
13+44%+63%YC$2.1MSeed$2M, Apr 2023
13
Adventris makes cancer vaccines
10+43%+25%0$500KYC investment$500K, Jan 2024
14
Metal is an AI-driven operating system for fundraising
127+43%+189%0$4.5MSeed$4.5M, Jun 2026
15
Restaurant software that actually works
37+42%+118%YC$500KYC investment$500K, Sep 2024
16
Production-ready document processing
37+42%+131%0$17.5MSeries A$17M, Jun 2025
17
AI-powered Sales Agent for Service-Based Industries
270+38%+108%6$126MSeries B$125M, Apr 2026
18
Move money programmatically - built for developers
21+31%+62%0$14MSeries A$13.5M, Jul 2026
19
Build and deploy fully‑managed AI agents and workflows
17+31%+143%6$18.5MSeries A$16M, Dec 2025
20
Billing and project management for utility construction
13+30%+30%YC$2.7MSeed$2.2M, Apr 2023
21
Automation platform for logistics
44+29%+38%YC$18.3MSeries A$14.2M, Dec 2024
22
We help global software companies comply with local tax reporting
22+29%+100%YC$2.4MSeed$1.7M, Apr 2023
23
Offensive security for the teams that are 100x outnumbered
77+28%+64%YC$23.8MSeries A$17.9M, Mar 2026
24
The AI-native sales tax solution.
173+25%+63%2$158MSeries C$100M, Sep 2026
25
20+25%+33%0SeedJan 2025
26
Ai-native finance platform for the Middle East
367+25%+79%3$55MSeries A$48M, Aug 2025
27
Create beautiful videos & docs for any product or process in minutes
41+24%+95%3$11.9MSeries A$10M, Oct 2026
28
The operating system for the car wash industry.
11+22%+57%0$500KYC investment$500K, Apr 2023
29
Automating root cause analysis with generative AI
11+22%+57%0$7.5MSeed$7M, Oct 2025
30
Infrastructure for indirect revenue channels
180+22%+58%14$18.5MSeries A$15M, Feb 2025
31
Phone AI that Captures Every Dealership Revenue Opportunity
18+20%+100%YC$2.7MSeed$2.7M, Jul 2023
32
The AI-native workspace to design your product.
12+20%+71%1$6MSeries A$6M, Nov 2025
33
Transforming how health systems optimize labor
74+19%+85%12$31MSeries A$31M, Oct 2026
34
Neobank for global remote workers
38+19%+31%0$1.6MGrant$60K, Jun 2024
35
AI Agents for Fraud Review and Investigations
20+18%+54%YC$25.1MSeries A$21.5M, Mar 2026
36
The leading AI workforce for the trades.
61+17%+56%1$500KYC investment$500K, Apr 2023
37
Fast, Transparent Patient Experiences
342+16%+56%19$161MSeries C$101M, Jun 2025
38
AI Servicing for Auto Lenders
67+16%+86%9$60.5MSeries A$60M, Jul 2025
39
Plaid for Commercial Real Estate
15+15%+36%0$3.3MSeed$3.3M, Oct 2023
40
The Agentic Support Platform purpose-built for B2B.
183+15%+81%3$51.3MSeries B$31M, Aug 2025
41
Dollar banking for people in Latin America
69+15%+50%0$4.5MYC investment$500K, Apr 2023
42
The AI Agent platform for finance
24+14%+71%YC$17.2MSeries A$12M, Jan 2026
43
Plaid for supply chain logistics
24+14%+14%0$3.1MSeed$2.6M, Nov 2023
44
All-in-One Software for the $1T Grocery Industry
24+14%+41%YCSeedJan 2024
45
Building the first multimodal agents to play and test games.
25+14%+25%0$8MSeed$6M, Mar 2025
46
Cloud warehousing & supply chain platform in MENA
60+13%+20%YC$10.4MSeries A$9.9M, Sep 2026
47
Hire the best AI Sales employees | AI SDR | AI RevOps | AI EA
57+12%+159%1$1.4MSeed$800K, Jul 2023
48
the AI social facilitator for offline human to human interactions
203+12%+38%YC$16.2MSeries A$10.1M, Dec 2025
49
A single API for all your integrations
20+11%+82%8$7.5MSeed$4.5M, Mar 2026
50
AI for Government Contractors
20+11%+33%2$2.5MSeed$2.5M, Mar 2025
51
Models and infra for coding agents
10+11%+25%2$23MSeries A$23M, Oct 2025
52
Design and explain complex software architecture.
10+11%+25%YC$500KYC investment$500K, Apr 2023
53
Less screen time, more life.
10+11%+100%0$1MSeed$500K, Oct 2025
54
Automate data-driven slide decks and documents with AI
31+11%+3%YC$12.9MSeries A$11M, Oct 2024
55
Dill helps construction suppliers automate accounts receivable,…
21+11%+17%1SeedApr 2023
56
We teach your immune system to attack and cure cancer
11+10%+22%0$500KYC investment$500K, Apr 2023
57
Build the software you wish existed.
60+9%+25%1$5.5MSeed$5M, Aug 2023
58
AI-native storytelling studio.
25+9%+39%YC$500KYC investment$500K, Apr 2023
59
Fully Agentic SWE
40+8%+33%8$3.5MUndisclosed round$534K, Jan 2026
60
Automating Securities Compliance
82+8%+49%1$24.5MSeries A$22M, Jul 2026
61
Email for developers
79+7%+46%5$21.5MSeries A$18M, Dec 2024
62
AI & financial services for real estate in LatAm, starting by rent
17+6%+31%0$1.6MSeed$1.1M, Sep 2025
63
B2B Marketplace for Steel Raw Materials
17+6%+6%0$1.4MSeries A$1.4M, Apr 2023
64
Managed marketplace for solar in Latam
59+5%+31%0$500KYC investment$500K, Apr 2023
65
Frictionless payments via SMS
21+5%−28%0$5MSeed$4.5M, Jul 2025
66
AI-powered document automation: collect, review, extract, and sync.
23+5%+28%0$3.6MSeed$3.5M, Apr 2023
67
AI Platform for Architects and Engineers
47+4%+47%2$17.1MSeries A$15M, Dec 2025
68
Advertising for the new internet
93+3%+19%YC$10MSeries A$10M, May 2026
69
AI Wealth Manager
34+3%+26%YC$2.7MSeed$2.6M, May 2023
70
AI-powered care for seniors with chronic disease
35+3%+40%6$500KYC investment$500K, Mar 2023
71
Train AI on distributed data
83+2%+1%0$23.6MSeries A$20M, Feb 2024
72
The Finance Control Centre for African Businesses
43+2%+16%0$2.5MSeed$2M, Dec 2023
73
Empowering Autism Care Providers to Go Independent
131+2%+6%83$3.3MSeries A$3.2M, Mar 2024

How this works

1. The roster

Every launched company in YC's public directory, with its batch, status, industry and location. New companies show up the week YC lists them.

2. The numbers

Each company is matched to Crustdata by its website. Crustdata adds team size and its change over 6 and 12 months, open roles from job postings, reported funding, and founders' past employers.

3. The lists

Hiring the most counts distinct roles posted in the last 60 days. Growth needs 10+ people today, shrinking 20+ a year ago, so tiny teams do not top the lists. Rebuilt every week.

Built with Crustdata. Get your own API key and build your own.

The numbers on this page come from three Crustdata API calls. Crustdata tags 5,000+ companies with Y Combinator as an investor; swap the filter for any investor, industry or headcount range and track your own list, with founders' work emails one call away.

  • Company search for team size, growth and funding
  • Job search with a count by company, for who is hiring and for what
  • A watch that re-runs the search weekly and sends only what changed
# 1. every company with Y Combinator as an investor
curl https://api.crustdata.com/company/search \
  -H "authorization: Bearer $CRUSTDATA_API_KEY" \
  -H "x-api-version: 2025-11-01" \
  -d '{
    "filters": { "field": "funding.investors",
                 "type": "in", "value": ["Y Combinator"] },
    "fields": ["basic_info.name",
      "headcount.total", "headcount.growth_percent",
      "funding.total_investment_usd"],
    "limit": 100
  }'

# 2. open listings per company, last 60 days (limit 0 = counts only)
curl https://api.crustdata.com/job/search \
  -H "authorization: Bearer $CRUSTDATA_API_KEY" \
  -H "x-api-version: 2025-11-01" \
  -d '{
  "filters": { "op": "and", "conditions": [
    { "field": "company.basic_info.company_id",
      "type": "in", "value": [...] },
    { "field": "metadata.date_added",
      "type": "=>", "value": "2026-08-24" } ]},
  "limit": 0,
  "aggregations": [{ "type": "group_by",
    "field": "company.basic_info.company_id", "agg": "count" }]
}'

# 3. the same company filter as a weekly watch: POST /watch/company/search

Questions about YC W23 companies

How many YC W23 companies are there?

274 companies were in Y Combinator's Winter 2023 batch (W23); 199 are active.

Which YC W23 companies are hiring?

33 companies posted roles in the last 60 days, led by Finni Health (83 roles), Latent (24 roles) and Tennr (19 roles). 79 mark themselves as hiring on YC's directory.

Which YC W23 companies are growing fastest?

By team growth over 6 months (10+ people): LiteLLM (+100%), Haven (+83%) and Warp (+61%).

Which YC W23 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Avoca ($125M), Numeral ($100M) and Latent ($80M).

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