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Fastest growing S24 companies

The 62 YC S24 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 62 of 62 companies on this list
#CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
1
Renewable infrastructure deployment at scale.
12+140% 0$4.4MSeed$3.9M, Apr 2026
2
AI-native medical record retrieval
63+103%+385%3$500KYC investment$500K, Jan 2026
3
Practical, general-purpose robots for repetitive industrial tasks
38+100%+192%YC$62MSeries A$50M, Oct 2026
4
Look inside the model
25+92%+257%0$500KYC investment$500K, Jan 2026
5
Corgi is building an AI financial infrastructure company
402+88%+272%16$439MSeries B$64M, Sep 2026
6
Invest in Global Equities from India
24+85%+167%0$500KYC investment$500K, Sep 2024
7
AI agent for Accounts Receivable
44+76%+389%2$21.7MUndisclosed round$17M, Aug 2026
8
AI voice that sells
33+65%+313%12$14.5MSeed$14M, Feb 2026
9
AI-native HOA Management Company
13+63%+44%YCUndisclosed roundSep 2024
10
AI call centers
47+62%+135%4$16.5MSeries A$16M, Apr 2026
11
AI employee for consumer lending
19+58%+111%8$24.5MSeries A$24M, Sep 2026
12
Data centers in space
66+57%+128%YC$444MSeries A$250M, Aug 2026
13
AI agents that handle communications for clinics
11+57%+57%YC$500KYC investment$500K, Sep 2024
14
autarc is the agentic OS for energy installers.
75+56%+92%1$9.4MUndisclosed round$8.8M, Dec 2024
15
Worldwide exam-prep platform
25+56%+79%1$500KYC investment$500K, Jan 2025
16
Growth through always‑on consumer understanding
103+54%+472%9$55.8MSeries A$50M, Sep 2026
17
Custom Parts, Manufactured in America 🇺🇸
12+50%+140%1$500KYC investment$500K, Jul 2025
18
Automate security and privacy reviews
25+47%+67%2$13.4MSeed$8.4M, Feb 2026
19
The autonomous data engineer for the mid-market
16+45%+129%5$6.3MSeed$5.8M, Sep 2026
20
Automatically find and fix your software vulnerabilities
13+44%+86%0$5.5MSeed$5M, Sep 2025
21
Automating airport baggage handling with robots.
10+43%+67%YC$4MSeed$3.5M, Apr 2025
22
Find & resolve issues in data center engineering & operations using AI
14+40%+100%2$500KUndisclosed round$500K, Jul 2026
23
Automate circuit board design using AI
14+40%+75%YC$11.9MSeries A$11.4M, Jul 2025
24
Applied AI for workforce operations
47+38%+104%4$5.5MSeed$5M, Feb 2025
25
Autonomous Accounting Software
15+36%+67%YC$4.7MYC investment$500K, Oct 2024
26
AI app builder that turns your ideas into monetizable software.
410+34%+193%33$230MSeries C$130M, Jul 2026
27
AI Supply Chain Manager for CPG
12+33%+20%0$500KYC investment$500K, Dec 2024
28
The organic growth engine for financial advisors
41+32%+173%3$21.8MSeries A$17M, Dec 2025
29
Production-grade unstructured document extraction
46+31%+53%2$4.4MSeed$3.9M, Feb 2025
30
AI Agents for collections
68+28%+55%YC$500KYC investment$500K, Jan 2025
31
GPS Denied Navigation for Drones
14+27%+40%YC$4.8MSeed$4.3M, Apr 2025
32
Practical and delightful home robots
20+25%+67%6$500KYC investment$500K, Sep 2024
33
Artificial Intelligence for your medical billing team
10+25%+11%0$500KYC investment$500K, Sep 2024
34
Multimodal AI agents for video
10+25%+43%YC$1.9MSeed$1.9M, Dec 2024
35
Autonomous freight coordination
26+24%+136%YC$2.4MSeed$2.4M, Oct 2024
36
Enzyme design models.
11+22%+10%0$500KYC investment$500K, Jan 2026
37
AI Agents for Advisory & Financial Services.
11+22%+38%0
38
We work on generalizable tools for the next era of biotech.
11+22%+22%4$4.5MSeed$4M, Nov 2024
39
Medical search engine built to reason like a clinician.
34+21%+13%1$500KYC investment$500K, Sep 2024
40
Legal Agent that delivers finished work
17+21%+55%0$500KYC investment$500K, Jan 2025
41
USDC-Smart Neobank for Latinos.
18+20%+50%YC$20.1MSeed$20M, Sep 2025
42
Spur is the validation infrastructure enterprises use to ship at the…
92+19%+74%1$5MSeed$4.5M, Apr 2025
43
Self Improving Software
13+18%+18%YC$7.4MSeed$5.4M, Aug 2025
44
Complete QA platform for voice agents
20+18%+43%YC$4.3MSeed$3.8M, Dec 2024
45
Automating Deal Decks for Commercial Real Estate Brokers
35+17%+106%8$21.3MSeries A$16.5M, Jul 2026
46
AI-native operating system for behavioral health clinics.
21+17%+40%YC$500KYC investment$500K, Sep 2024
47
Next-generation biocides for sustainable agriculture at scale
15+15%+67%0$500KYC investment$500K, Sep 2024
48
OS for global e-commerce expansion of brands & manufacturers
15+15% 0$500KYC investment$500K, Nov 2024
49
Compliance and back office workflows for Wealth Managers.
76+15%+49%1$17.7MSeries A$17.2M, Oct 2025
50
Faster healthcare payments
16+14%+23%YC$500KYC investment$500K, Sep 2024
51
Simulation & Evaluation that scales voice and chat AI agents
26+13%+136%2$31.8MSeries A$28M, Jun 2026
52
Apple Care-like warranty program for every retailer
36+13%+50%0$2.5MSeed$2.5M, Sep 2024
53
The Enablement Layer for Physical AI
10+11%+100%0$750KPre-seed$250K, Feb 2025
54
Data for biomedical AI
10+11%+25%0
55
AI for critical banking operations
22+10%+83%YC$3.1MSeed$3M, Jan 2025
56
Foundation models for time series
12+9%+33%YC$500KYC investment$500K, Jan 2025
57
The Memory layer for AI Agents
26+8%+73%2$24.4MSeries A$3.9M, Oct 2025
58
AI-native office leasing broker
42+8%+14%YC$6.1MSeed$6.1M, Feb 2025
59
Vanta for carbon compliance
14+8%+40%YC$500KYC investment$500K, Oct 2024
60
The GPU sandbox company
14+8%+56%YC$17.6MSeries A$13M, Aug 2026
61
Genetically engineered viruses that teach your immune system to kill…
18+6%+38%0$9.7MSeed$9.1M, Jun 2026
62
AI tax assistant for professionals and businesses
52+2%+30%YC$5.1MSeed$4.6M, Feb 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 S24 companies

How many YC S24 companies are there?

248 companies were in Y Combinator's Summer 2024 batch (S24); 232 are active.

Which YC S24 companies are hiring?

35 companies posted roles in the last 60 days, led by Emergent (33 roles), Corgi (16 roles) and Simple AI (12 roles). 97 mark themselves as hiring on YC's directory.

Which YC S24 companies are growing fastest?

By team growth over 6 months (10+ people): Plume (+140%), Codes Health (+103%) and Ultra (+100%).

Which YC S24 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Starcloud ($250M), Emergent ($130M) and Corgi ($64M).

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