CrustdataGet an API key

Fastest growing F25 companies

The 30 YC F25 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 30 of 30 companies on this list
#CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
1
We Handle AI. You Direct Films.
20+186% 1$6.5MSeed$6M, May 2026
2
The Waymo of Personalized demos
16+167% YCSeedDec 2025
3
Agentic AI for Society Builders
29+164%+480%YC$8.5MSeed$8M, Jan 2026
4
AI healthcare concierge for employees
13+160% YC$500KYC investment$500K, Dec 2025
5
Real World Environments and Data for AI
17+143%+143%0$500KYC investment$500K, Dec 2025
6
Automating claims processing workflows for health insurance payers.
11+120% 0SeedJan 2026
7
Large-scale real-world robot & human data for embodied AI
19+111%+138%0$6MSeed$6M, Dec 2025
8
Physical businesses that run themselves
10+100% YC$500KYC investment$500K, Dec 2025
9
Robots with soul
10+100% YC$1.2MSeed$653K, Feb 2026
10
Your Personal AI for everyday work. Lives in your texts.
13+86% 0$500KYC investment$500K, Dec 2025
11
Your Company Brain
11+83%+120%YC$7.1MSeed$7.1M, Dec 2025
12
AI outpatient care workforce
11+83% 0SeedDec 2025
13
AI property manager for landlords and estate agents
12+71% YC$500KYC investment$500K, Dec 2025
14
Casey is an AI-native commercial insurance brokerage
10+67% 0
15
Voice AI to enable India's next billion
62+59%+377%YC$6.4MSeed$6.3M, Jan 2026
16
TikTok for language learning
11+57%+83%0$500KYC investment$500K, Dec 2025
17
Superintelligent financial advisor
14+56%+133%YC$15MPre-seed$15M, Jan 2026
18
Global Compliance for Enterprises
18+50% YC$1.8MPre-seed$1.3M, May 2026
19
Stratospheric birds for defense
73+46%+143%5$650KYC investment$500K, Dec 2025
20
AI-powered market due diligence for investment decisions
13+44%+160%6$5.5MSeed$5M, Mar 2026
21
Replace marketing agencies with AI
23+35%+188%4$5MSeed$4.5M, Apr 2026
22
The fastest way to sell online.
14+27%+27%0$560KSeed$560K, Dec 2025
23
The AI-Native CRM that works for you
18+20%+80%YC$500KYC investment$500K, Dec 2025
24
AI operating system for home improvement manufacturers
12+20% 0
25
Agentic AI Filmmaking Platform
10+11%+67%YC$500KYC investment$500K, Aug 2026
26
The AI drawing review platform for architects and engineers.
11+10% 1$4.7MSeed$4.2M, Jun 2026
27
AI Agents for Hardware Engineering
14+8%+8%0$650KYC investment$500K, Dec 2025
28
Excel AI analyst for Power Users
14+8%+180%0$500KYC investment$500K, Dec 2025
29
Tinder for jobs
15+7% 0$500KYC investment$500K, Dec 2025
30
The mid-market agent platform
27+4%+125%1$6.3MSeed$5.8M, Apr 2026

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 F25 companies

How many YC F25 companies are there?

145 companies were in Y Combinator's Fall 2025 batch (F25); 140 are active.

Which YC F25 companies are hiring?

14 companies posted roles in the last 60 days, led by DiligenceSquared (6 roles), Icarus (5 roles) and Fernstone (5 roles). 56 mark themselves as hiring on YC's directory.

Which YC F25 companies are growing fastest?

By team growth over 6 months (10+ people): Flick (+186%), Karumi (+167%) and Brickanta (+164%).

Which YC F25 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Fifth Door ($20M), Autonomous Technologies Group ($15M) and Multifactor ($15M).

Browse YC companies

By batch

Show fewer

By industry

Show fewer

By location

Show fewer

By founders' past employer

Show fewer