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Fastest growing W26 companies

The 16 YC W26 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 16 of 16 companies on this list
#CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
1
Physical AI data lab
95+579% 3$8.7MSeed$8.2M, May 2026
2
Elite AI law firm for high growth companies
49+227% 2$11.5MSeed$11.5M, Feb 2026
3
AI pentesting, that works!
16+220% 7$500KYC investment$500K, Mar 2026
4
Full-Stack AI Accounting
16+220% YC$500KYC investment$500K, Feb 2026
5
Global AI-native law firm handling legal work with same-day turnaround
22+120% 1$9MSeed$9M, May 2026
6
Compression middleware that improves LLM outputs
11+120% 0$500KYC investment$500K, Mar 2026
7
Multilingual voice agents that outperform humans
20+82%+122%0$500KYC investment$500K, Apr 2026
8
Take Notes in the Real World
24+71%+243%19$11.5MSeed$11M, Jun 2026
9
AI Recruiting Coordinator for Executive Search
17+70% YC$500KYC investment$500K, Mar 2026
10
Intelligence for cultural institutions
10+67% 0$500KYC investment$500K, Mar 2026
11
AI Agents That Run Hotel Operations.
12+50% 5
12
Building AGI that can innovate.
14+27%+27%0$500KYC investment$500K, Jan 2026
13
Infrastructure for identity and fraud.
38+27%+46%0$8.5MSeed$7.5M, May 2026
14
The first AI-powered worldbuilding and gameplay platform
10+25%+67%YC$500KYC investment$500K, Mar 2026
15
The first finance-compliant proactive AI that runs 24/7
31+24%+94%YC
16
Automate enterprise workflows through chat
14+8%+133%YC$500KYC investment$500K, 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 W26 companies

How many YC W26 companies are there?

197 companies were in Y Combinator's Winter 2026 batch (W26); 192 are active.

Which YC W26 companies are hiring?

12 companies posted roles in the last 60 days, led by Pocket (19 roles), Parameter (7 roles) and Brumby (6 roles). 65 mark themselves as hiring on YC's directory.

Which YC W26 companies are growing fastest?

By team growth over 6 months (10+ people): Human Archive (+579%), General Legal (+227%) and Parameter (+220%).

Which YC W26 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Luel ($31.2M), General Legal ($11.5M) and Pocket ($11M).

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