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Fastest growing S23 companies

The 66 YC S23 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 66 of 66 companies on this list
#CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
1
The GPU Cloud Marketplace
21+110%+200%YCSeedJan 2025
2
AI Phone Agents for Healthcare Operations
70+100%+400%4$35MSeries A$30M, Jun 2026
3
AI Compliance Platform for Healthcare Organizations
24+100%+300%1$11MSeries A$11M, Oct 2026
4
Autonomous surgical robots
19+90%+73%5$15.6MSeries A$15M, Aug 2026
5
Intelligence that runs your operations.
260+83%+192%36$211MSeries C$150M, Aug 2026
6
AI for ASIC Design Verification
16+78%+167%0$500KYC investment$500K, Sep 2023
7
TurboTax for Medicaid
28+75%+65%1$22.3MSeries A$18.3M, Jul 2025
8
AI-powered risk and compliance for financial institutions
14+75% YC$11MNon-equity support$11M, Mar 2026
9
The cheapest way to borrow money
26+73%+225%1$500KSeed$500K, Jun 2026
10
Superhuman video production as a service
15+67%+67%YCSeedFeb 2025
11
AI contract repository
13+63%+44%0SeedOct 2023
12
AI-driven Retention Automation for subscription media businesses.
16+60%+129%0$1.6MPre-seed$1.6M, Feb 2024
13
AI-native platform for corporate meetings and events
19+58%+46%YC$2.5MSeed$2M, Dec 2024
14
Automating Compliance for Construction
62+51%+148%YC$21.8MSeries A$15M, Jul 2026
15
The all-in-one AI platform for companies.
74+51%+155%12$3.5MSeed$3M, Apr 2024
16
AI Customer Service Agents for trades and field services
39+50%+117%1$16.4MSeries A$12.9M, Jan 2026
17
AI revenue recovery for underpaid healthcare claims.
12+50% YC$2.8MSeed (before YC)$2.8M, May 2023
18
The AI Native ERP for the fastest growing companies.
199+45%+165%11$108MSeries B$65M, Oct 2025
19
End-to-end content, learning, & deal intelligence for B2B sales teams
68+45%+183%YC$55MSeries B$40M, Feb 2026
20
AI-powered user interviews
113+43%+232%25$51.3MSeries B$30M, Dec 2025
21
The all-in-one EMR built for med spas and elective care
17+42%+89%5$4.5MSeed$4M, Nov 2025
22
Unmanned airships for inspecting our critical assets
37+37%+42%1$19MSeries A$14.6M, Oct 2026
23
AI for Government Contracting.
19+36%+36%YC$2.3MSeed$2.2M, Aug 2024
24
AI patent drafting, prosecution, litigation and more for legal teams.
72+33%+125%3$55MSeries B$40M, Dec 2025
25
Marketplace for Rare Coins & Precious Metals
12+33%+50%3$15.6MUndisclosed round$15.6M, Nov 2025
26
Revenue Activation Platform
69+30%+103%6$18.3MSeries A$15M, Sep 2025
27
AI agents for fintech risk and compliance operations
18+29%+50%1$2.9MSeed$2.4M, Mar 2026
28
AI Agents For RFP and Questionnaire Response Automation
18+29%+38%0$4.5MSeed$4M, Aug 2024
29
Plaid for Telematics Data in Commercial Trucking
74+28%+90%1$23.1MSeries A$20M, Jul 2026
30
All-in-one POS for liquor stores
198+26%+37%YC$22.6MSeries A$15M, Oct 2026
31
AI Support Agent for Enterprises.
128+24%+156%3$64.6MSeries A$61M, Aug 2025
32
Digital-native home painting franchise
31+24%+19%1$15MSeed$11M, Sep 2023
33
AI Powered All-In-One Payroll, HR + Recruiting
22+22%+57%YC$17.1MSeries A$12M, Apr 2026
34
AI agents that run insurance operations
22+22%+100%1$4.8MSeed$2.3M, Sep 2025
35
The World's First Multi-Agent System for Procurement
149+22%+192%6$30MSeries A$30M, Mar 2026
36
Software that streams data from databases to warehouses in real-time
23+21%+92%2$18.9MSeries A$15.1M, Jan 2026
37
Personalized learning built for schools
37+19%+76%YC$15.5MSeries ANov 2025
38
iMessage for Sales
65+18%+30%1
39
Live intelligence for biopharma teams.
13+18%+86%YC$3.6MSeed$3.1M, Apr 2025
40
AI enabled marketplace matching trucks with jobs
33+18%+27%2$15.5MSeries A$15M, Oct 2025
41
Make Banking Magical
60+18%+40%3$32.9MSeries A$29M, Aug 2025
42
AI-native operations for the banks
107+16%+47%1$95.3MSeries B$75M, Feb 2026
43
The compliant AI colleague for sales teams in Europe
15+15%+36%0$2.5MPre-seed$2M, Jul 2025
44
Build a website by chatting with AI
15+15%+15%0Pre-seedAug 2023
45
Shopify for Homebuilders
15+15%+50%0Pre-seedJun 2023
46
Search engine for trustworthy medical information.
16+14%+23%0SeedDec 2024
47
Farm Genetics Made Easy - Using DNA and Software
25+14%+127%0$5.8MSeed$5.3M, Dec 2025
48
Helping businesses in emerging markets make pay their international…
102+13%+67%YC$18MSeries A$18M, Feb 2025
49
Stripe for HSA/FSA payments
51+13%+31%YC$18.2MSeries A$15M, Sep 2025
50
Manage energy cost & usage with AI for facility & sustainability teams
10+11%+11%YC$500KYC investment$500K, Jan 2024
51
A compliance training platform built for regulated industries.
10+11%−29%0$500KYC investment$500K, Jan 2024
52
We get patients to their next appointment
10+11%+67%YC$5.5MSeed$5M, Jun 2026
53
Combination therapeutics for the world's toughest diseases
10+11%+11%0$8.7MSeed$4.5M, Mar 2025
54
The fastest way to build AI assistants on technical content
51+11%+50%YC$3.7MSeed$3.2M, Oct 2024
55
Virtual Care for Type 2 Diabetes Reversal
62+11%+24%2$500KYC investment$500K, Sep 2023
56
AI-powered forecasting & replenishment for grocery
11+10% YC
57
Navigating patients to the right place, first time.
46+10%+28%5$3.9MSeed$3.4M, Jul 2024
58
Running clinical trials with AI
23+10%+15%0Pre-seed (before YC)Apr 2023
59
AI-Native CPQ & Billing for Modern Pricing Models
83+9%+20%YC$4.5MSeed$4M, Sep 2025
60
Fast, reliable, reproducible AI with GPU live migration
14+8%+17%YC$500KYC investment$500K, Sep 2023
61
AI Coordination Layer for Supply Chain
16+7%+100%0$4.4MSeed$3.9M, Mar 2026
62
Using generative AI to call insurance for healthcare clinics
16+7%+14%YC$500KYC investment$500K, Sep 2023
63
Claims infrastructure for African health insurance
71+6%+8%0$785KDebt$285K, Jun 2026
64
The open-source document editor for humans and AI agents.
19+6% 0$2.6MSeed$2.6M, Oct 2023
65
The enterprise platform for AI phone calls
123+4%+38%5$106MSeries C$50M, Jun 2026
66
Your 24/7 AI Recruiter
28+4%+27%0$2MSeed$1.5M, Jan 2025

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 S23 companies

How many YC S23 companies are there?

220 companies were in Y Combinator's Summer 2023 batch (S23); 178 are active.

Which YC S23 companies are hiring?

37 companies posted roles in the last 60 days, led by HappyRobot (36 roles), Outset (25 roles) and Langdock (12 roles). 87 mark themselves as hiring on YC's directory.

Which YC S23 companies are growing fastest?

By team growth over 6 months (10+ people): Shadeform (+110%), Prosper (+100%) and Readily (+100%).

Which YC S23 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: HappyRobot ($150M), Singularity ($80M) and Bretton AI ($75M).

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