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Fastest growing W24 companies

The 63 YC W24 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 63 of 63 companies on this list
#CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
1
The relationship intelligence platform for enterprise revenue
29+107%+142%3$19.5MSeries A$15M, Jul 2026
2
AI Time Platform for Law Firms
42+100%+320%9$19.6MSeries A$16M, Mar 2026
3
The unified context layer for enterprise data
10+100%+67%YC$2.3MYC investment$500K, Mar 2024
4
Practice admin run by AI
15+88%+150%YC$6MPre-seed$6M, Feb 2024
5
Yarn is the video product for agentic GTM teams.
13+86%+160%YC$500KSeed$500K, Jan 2026
6
Modern health insurance for dual income families
42+83%+147%YC$14.5MSeries A$14M, Jul 2026
7
The agentic operating system for legal work
980+81%+321%123$866MSeries D$50M, Apr 2026
8
AI employees that take on real work, starting with sales
342+75%+4,786%2$46.1MSeries A$25M, Apr 2025
9
The AI operating system for commodity operations
12+71%+71%YC$500KUndisclosed round$500K, Jan 2026
10
Modern OS for the financial back office.
37+61%+185%9$20MSeries A$15.5M, May 2026
11
AI code review agent with complete context of your codebase
45+61%+125%16$80.3MSeries B$50M, Aug 2026
12
The complete agentic document platform
99+60%+175%14$108MSeries B$75M, Oct 2025
13
Sentry for AI Agents
19+58%+138%2$15MSeries A$15M, Sep 2026
14
Accelerate Medication Access with AI
20+54%+150%14Undisclosed roundApr 2024
15
Supersonics for the new Jet Age
71+51%+137%45$27.6MSeries B$27.1M, Jul 2026
16
The AI for Financial Services.
263+49%+217%5$87.5MUndisclosed round$75M, Aug 2026
17
Earn airline miles on hotels and everyday spend.
58+49%+38%1Undisclosed roundJan 2026
18
The AI communication layer for healthcare
31+48%+48%1$10.5MSeed$10M, Sep 2026
19
Open-source, extensible AI gateway with observability and evals
22+47%+144%YC$5.5MSeed$5M, Mar 2026
20
Marketplace for America's most essential assets
230+46%+150%2$22.8MSeries B$17.8M, Sep 2026
21
Supercharge Your Contact Center Operations with AI Phone Agents
196+45%+109%20$4.7MSeed$4.6M, Apr 2024
22
AI Workforce for the Insurance Industry
71+42%+209%5$30MSeries A$25M, Oct 2025
23
AI lipsync tool for video content creators
61+42%+56%0$6.4MGrant$250K, Oct 2024
24
Business banking for cross-border SMBs & Startups
28+40%+47%YC$1.9MPre-seed$1.9M, Apr 2024
25
Authoring documents for life sciences in minutes, not months.
28+40%+211%1$16.5MSeries A$16M, Apr 2026
26
Delightful robots
14+40%+180%YC
27
Constellations as a Service
11+38%+83%0$4MSeed$3.5M, May 2024
28
Give your voice agents a face
11+38%+83%0$10.5MSeed$10.5M, Dec 2025
29
Agentic Marketing Platform
29+32%+93%YC$20.9MSeries A$18.7M, Jun 2026
30
AI Inference Platform for Drug Discovery
21+31%+91%YC$13.6MSeries A$13.6M, Feb 2026
31
AI-native investment bank for small businesses
38+31%+58%YC$16.8MSeries A$12M, Jul 2025
32
Validated mental health support in your pocket, anytime.
26+30%+53%YCSeedMar 2024
33
Tools for AI agents to run marketing for the world's biggest…
18+29%+125%YC$500KYC investment$500K, Apr 2024
34
The multiplayer AI agent builder. Let anyone build, IT controls access
51+28%+122%8$70.1MSeries B$50M, Mar 2026
35
Autonomous offensive and defensive cybersecurity platform
33+27%+38%YC$6.2MSeed$3.6M, Jan 2026
36
Global neobank for emerging markets
147+27%+34%0$1.5MUndisclosed round$1.5M, Jan 2026
37
Data services for finance and operations at PE-backed companies.
20+25%+54%YC$2.7MSeed$2.2M, Jul 2024
38
AI-enabled Surety Bond Broker
10+25%+67%0$950KYC investment$500K, Apr 2024
39
The orchestration platform for teams who ship.
10+25%+100%0$500KYC investment$500K, Feb 2024
40
Mobile carrier for businesses in Brazil
53+23%+39%0$3.3MSeed$1.9M, May 2024
41
AI for risk and compliance
34+21%+70%1$3.5MSeed$3M, Aug 2024
42
Enterprise AI customer support
35+21%+289%1$9.1MSeed$7M, Jan 2026
43
AI platform for phone-first sellers
18+20%+100%YC$500KSeed$500K, Jan 2026
44
Open source alternative to AWS
20+18%+18%YC$16MSeed$16M, Mar 2024
45
LLM Security and Compliance
20+18%+33%YC$3.2MSeed$3.2M, Apr 2024
46
AI agents for healthcare admin
22+16%+100%10$23.5MSeries A$20M, Mar 2026
47
Speaking coach for non-native English professionals
32+14%+14%0$2.5MSeed$2M, Jun 2024
48
AI Creative Strategist
24+14%+50%YC$2.6MYC investment$500K, Mar 2024
49
AI-powered phone platform for dentists
17+13%+13%YC$3.8MSeed$3.8M, Oct 2025
50
Transparent, AI-powered healthcare TPA.
20+11%+43%YC$2.1MSeed$2.1M, Jan 2026
51
AI for Robot Arms in Factories
10+11%+25%YC$500KYC investment$500K, Jul 2024
52
An AI-powered supply chain compliance engine
22+10%+69%YC$3.8MSeed$3.3M, Jun 2024
53
Foundation Models for the Brain
11+10%−8%YC$8MSeed$1.5M, Dec 2024
54
AI-enabled procurement for government
12+9%+9%YC$2MSeries A$1.5M, Jan 2026
55
Card issuer processor and banking stack for businesses in Sub-…
30+7%+30%0$500KYC investment$500K, Jan 2024
56
B2B construction marketplace to match contractors and subcontractors.
15+7%+25%0$2MPre-seed$2M, Mar 2024
57
The secondary market for real estate leases
16+7%+60%0$6.4MUndisclosed round$5.9M, Mar 2025
58
International Billing Ops, Sales Tax and Payments for SaaS businesses
18+6%+64%YC$500KYC investment$500K, Feb 2024
59
Risotto auto-solves IT support requests using AI
19+6%+111%0$10.5MSeed$10M, Jan 2026
60
Building The Next Generation of Night Vision Devices
19+6%+36%YC$6MSeries A$5.5M, Sep 2025
61
Alex is the AI recruiter for hiring great people.
47+4%+31%3$20.5MSeries A$17M, Sep 2025
62
An all-in-one platform for building internal agents & workflows
26+4%+8%0$500KSeed$500K, Jan 2026
63
AI Agents for Hospitality
27+4%+4%YC$3.6MSeed$3.1M, Apr 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 W24 companies

How many YC W24 companies are there?

248 companies were in Y Combinator's Winter 2024 batch (W24); 208 are active.

Which YC W24 companies are hiring?

33 companies posted roles in the last 60 days, led by Legora (123 roles), Astro Mechanica (45 roles) and Retell AI (20 roles). 93 mark themselves as hiring on YC's directory.

Which YC W24 companies are growing fastest?

By team growth over 6 months (10+ people): Centralize (+107%), PointOne (+100%) and Zep AI (+100%).

Which YC W24 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Model ML ($75M), Blacksmith ($66M) and Legora ($50M).

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