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Fastest growing W20 companies

The 56 YC W20 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 56 of 56 companies on this list
#CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
1
API for at-home health data
74+37%+72%5$18.6MSeries A$18M, Mar 2025
2
Bathroom cleaning robots for office buildings.
52+27%+33%0$21MUndisclosed round$13.7M, Feb 2025
3
AI-powered tech that makes business TV smarter, engaging, and…
135+26%+101%2$27.5MDebt$3.5M, Jul 2026
4
Salary advance to employees in Brazil.
141+26%+76%0$17.5MSeries A$11M, Aug 2024
5
Pre-tax and lifestyle benefits, managed in one place.
135+25%+67%7$74.7MSeries B$40M, Jan 2026
6
Scalable validation infrastructure for AI agents
11+22%+22%0$4.2MUndisclosed round$4M, Apr 2025
7
Building the world's first 1:1 AI teacher.
102+20%+34%1$15.4MSeries A$15M, Sep 2023
8
The autonomous revenue cycle management platform.
243+19%+45%2$220MSeries D$120M, Jul 2026
9
Using CRISPR to find treatments for cancer and inflammation
20+18%+33%1$21.4MSeries A$12.5M, Aug 2026
10
AI for R&D of consumer brands like P&G to develop better products
22+16%+29%YC$18.4MSeries A$16.5M, Jan 2022
11
AI estimator & agent for remodelers.
70+15%+52%6$5.8MSeries A$5.8M, Jun 2025
12
The single platform to analyze, test, observe, and deploy new features
234+15%+61%2$182MSeries E$75M, Sep 2025
13
The next generation of induced-proximity medicines.
25+14%+14%YC$16MUndisclosed round$16M, May 2026
14
Whatnot is the largest livestream shopping platform in the U.S.
2,223+13%+35%9$1.5BSeries G$547M, Aug 2026
15
Cortex is the Internal Developer Portal eliminating “developer tax”…
115+13%+7%1$113MSeries C$60M, Sep 2024
16
Shopify for Real Estate Developers
18+13%+13%0$1.3MSeed$1.1M, Feb 2021
17
We build advanced satcom user terminals
19+12%+36%3$23.6MCorporate round$10M, Nov 2025
18
We empower the world’s hiring teams to grow engaged, high-performing…
86+12%+19%2$55.2MSeries B$25M, Apr 2026
19
Monetisation tool for the Indian creator economy
79+11%+32%0$1.4MEquity crowdfunding$55K, Jan 2023
20
AI agent for Compliance Questionnaires Automation
10+11% 1$900KNon-equity support$900K, Nov 2020
21
Homeownership reimagined for the 21st century.
31+11%+15%YC$13.5MSeries A$8M, Nov 2022
22
The API to get recordings, transcripts, and metadata from meetings
43+10%+23%3$50.7MSeries B$38M, Sep 2025
23
Cybersecurity awareness for fast growing companies
260+10%+47%YC$44.2MSeries B$30M, Feb 2025
24
We offer free software that automates bureaucracy for real-estate…
45+10%+36%0$3.5MSeed$3.3M, Sep 2020
25
Open Finance API platform for Latam.
125+10%+12%YC$70MUndisclosed round$15M, Apr 2025
26
Telehealth provider for India.
57+10%+14%0$125KYC investment$125K, Aug 2021
27
Nomic is doing for proteins what Illumina has done for DNA
116+9%+13%YC$60MSeries B$42M, Sep 2024
28
AI that tells mining companies where to mine to maximize profits
24+9%+20%0SeedAug 2020
29
No-code data syncing between your systems
12+9%+9%0$2.4MSeed$2.4M, Feb 2021
30
Real-World Data for Health Innovation
50+9%+9%0$20.4MSeries A$10.4M, Sep 2024
31
The embedded integration platform for SaaS apps.
168+8%+21%YC$21.2MUndisclosed round$5.5M, Oct 2024
32
Connecting stakeholders across the healthcare ecosystem.
585+8%+12%22$234MSeries D$40M, May 2026
33
Run full stack apps close to your users.
56+8%+4%0$136MSeries D$25M, Jul 2026
34
College entrance test preparation App for students in Indonesia
70+6%+15%0$150KSeries A$150K, Nov 2020
35
maximizing biomass on low quality land
39+5%+15%YC$49MUndisclosed round$13M, Apr 2026
36
Next-generation DNA synthesis using enzymes
82+5%+21%7$130MSeries B$46.4M, Oct 2025
37
Termii is an AI-native reliability infrastructure company.
62+5%+11%0$5.2MNon-equity support$3.6M, Apr 2026
38
Manage the words across your team’s product from design to production.
22+5%+29%YC$13.8MSeries A$12.2M, Jan 2026
39
Payroll, compliance, benefits, and Employer of Record services for…
137+5%+1%0$10.3MNon-equity support$5M, Nov 2024
40
Speed up non-coding tasks for engineering teams
48+4%+9%0$47.6MSeries B$30.1M, Sep 2024
41
We create activating antibodies to treat diseases others can’t.
25+4%+14%0$12.9MSeed$7.6M, May 2024
42
Robotic Automation for cancer diagnostics - Robotic Microscopes &…
108+4%+30%YC$7.3MSeries A$5M, Nov 2025
43
Ultra-precise AI weather forecasting.
27+4% 0$30.8MUndisclosed round$17.6M, Dec 2024
44
Find culinary products and experiences from great makers everywhere
28+4% 0Pre-seedMar 2020
45
Medication & support to beat opioid addiction from home
388+3%+11%YC$67.7MSeries B$50M, Dec 2021
46
Fast and simple animation tool on the web 💫
35+3%+13%4$150KYC investment$150K, Mar 2020
47
Business banking that helps you grow
36+3% YC$101MSeries B$30M, Jul 2023
48
Financing platform for LatAm car dealerships.
221+2%+10%18$216MDebt$143M, Jul 2026
49
A virtual address + mailbox for business
92+2%+16%7$1MSeries A$1M, Nov 2023
50
Creating Microfinance 2.0.
179+2%+10%0$1.8MYC investment$150K, Mar 2021
51
Enterprise software to quantify cost-effective decarbonization…
63+2%+9%0$36MUndisclosed round$22M, Mar 2024
52
borong is a SaaS-enabled marketplace that connects brands like…
171+1%+4%YC$8.9MNon-equity support$3M, Jun 2024
53
We are connecting every single Mexican to the financial system.
92+1%+16%2$82.2MSeries B$50M, Nov 2021
54
Challenger bank for enterprises
186+1%+9%6$60MSeries B$45M, Apr 2022
55
The one-stop shop for mom-and-pop stores in Pakistan to buy inventory.
262+1%+3%0$18.9MUndisclosed round$17M, Jan 2022
56
The fastest shipping for online shopping
1,170+1%+4%107$129MSeries C$82M, Mar 2022

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 W20 companies

How many YC W20 companies are there?

229 companies were in Y Combinator's Winter 2020 batch (W20); 134 are active.

Which YC W20 companies are hiring?

28 companies posted roles in the last 60 days, led by 99minutos (107 roles), H1 (22 roles) and Nexu (18 roles). 40 mark themselves as hiring on YC's directory.

Which YC W20 companies are growing fastest?

By team growth over 6 months (10+ people): Junction (+37%), SOMATIC (+27%) and Taiv (+26%).

Which YC W20 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Whatnot ($547M), Candid Health ($120M) and H1 ($40M).

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