CrustdataGet an API key

YC W21 companies (Winter 2021)

All 334 companies in Y Combinator's Winter 2021 batch, with team size, growth, open roles and funding.

Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.

Hiring the mostlast 60 days
30 roles
REGENTW21
  1. 2Shepherd17
  2. 3Codingal9
See all 46
Fastest growingteam, 6 months
+200%
OpenCodeW21
  1. 2Venu AI+58%
  2. 3Vapi+50%
See all 89
Shrinkingteam, 12 months
−58%
MoichorW21
  1. 2Trela−56%
  2. 3Moonvalley−38%
See all 43
Raised the mostlast 12 months
$1B
Stoke SpaceW21
  1. 2Nourish$100M
  2. 3Ollama$65M
See all 18
Companies
334
Active
226
Hiring, last 60 days
46
Open roles, 60 days
189
People on these teams
52,025
Showing 50 of 334 companies
CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
Redcliffe Labs is India's Largest Omni-channel Diagnostics platform
2,065+5%+10%0$152MSeries C$42M, Sep 2024
Physical AI for asset-heavy industries
8880%+21%4$184MSeries C$120M, Dec 2024
Leading online after-school for kids & teens to learn AI & coding
822+5%+18%9$2MUndisclosed round$1.2M, Jan 2023
App for independent agents to sell financial products in India
733 −1%YC$11.6MSeries A$11M, Sep 2022
All-in-one real estate marketplace for Latin America
465−6%−3%0$44.7MUndisclosed round$35M, Jan 2022
Seamless mobility to, through, and from space. It starts with 100%…
451+17%+33%4$2.4BSeries E$1B, Sep 2026
We help US tech companies hire and manage software engineers in LATAM
4450%+9%0$18MSeries A$5M, Jan 2023
Simplifying hiring and payments for the global workforce
411+1%+4%0$34.7MSeries A$9M, Dec 2022
Internet for the urban developing world.
382+18%+41%0$75.6MSeries B$40M, Mar 2026
Challenger Bank for consumers in French speaking Africa.
3270%+4%0$49.1MDebt$1.5M, Aug 2026
A digital wallet for the Middle East & North Africa
324+15%+45%5$30.5MSeries A$22M, May 2026
The OS for Embedded Telecom
318+20%+51%YC$97MSeries B$73M, Dec 2024
All-electric seagliders for fast, affordable regional transportation
288+11%+15%30$327MDebt$120M, Aug 2026
Software and AI tools for SMBs in the US and Latin America
270−1%−3%0$63.8MSeries A$3M, Jun 2022
AI recruiter that runs outbound sourcing campaigns to find top talent
266+38%+62%YC$2.2MSeed$2.2M, Aug 2023
Amazon-like logistics for e-commerce companies in Latam
248+5%+3%0$34MSeries A$1M, Feb 2025
The data layer for physical AI
231+31%+75%3$110MSeries C$60M, Feb 2026
Cyble - World’s First Intelligence-Driven, AI-Native Security…
2300%−9%1$44.8MSeries B$6.2M, Nov 2023
Protecting the grid today, preparing the grid for tomorrow
221+18%+51%1$97.2MSeries B$55M, Nov 2025
The online language school for Latam, with groups led by an instructor
216−5%−18%0$4.4MEquity crowdfunding$1.5M, Apr 2024
The AI operating system for restaurants
214+10%+13%1$2.3MSeed$2.3M, Apr 2021
Reinventing lifelong learning for the future of work.
204−2%−7%0$1.2MAngel$678K, Feb 2022
The AI-native FP&A platform that helps Finance teams drive business…
196+32%+54%4
AI-powered customer service for startups
193+2%+9%0$1.2MUndisclosed round$125K, Jan 2023
Shopify for Beauty and Wellness businesses in Latam
186+9%+23%1$42.8MSeries B$35M, Aug 2025
The new wealth manager for Europe
177−4%+16%1$43.5MSeries B$29.5M, Sep 2025
Bring Justice to Light
171−14%−10%1$63MSeries B$35M, Sep 2023
The most flexible AI meeting notetaker ever built.
170−7%−1%0$23.8MEquity crowdfunding$2M, Oct 2024
Generative AI powered Shopify for home service professionals
168+7%+27%5$44MSeries B$27M, Aug 2025
The AI Underwriting OS for Commercial, Specialty & E&S insurance
167+7%+37%0$7.7MSeries A$7M, Nov 2025
Enabling consumers split the cost of purchases without a credit card
159−1%+1%0$17.7MDebt$15M, Sep 2021
AI-driven online tech school for busy professionals
154−8%−18%YC$6MGrant$2.7M, Nov 2024
Application Development Platform (Native Mobile + Web Apps)
151−6%−15%YC$28MSeries A$25.5M, Jan 2024
Voice AI for developers.
150+50%+114%4$70.6MSeries B$50M, May 2026
Online therapy platform for the Spanish-speaking market
146+4%+1%0SeedSep 2022
Admin automation for healthcare
145+22%+54%1$33.1MSeries B$30M, Feb 2025
Your AI GTM platform for In-Person Events
134+6%+19%5$2.4MSeed$2.2M, Mar 2021
We help people resolve debt.
133+9%+45%YCSeries AMay 2026
We underwrite and insure house rentals in Latam
131+1%−2%0$10MSeries A$5.6M, Nov 2024
Embedded lending infrastructure
126+8%+29%0$180MCorporate round$9M, Oct 2025
Where restaurants in Africa buy food supplies
124−6%−16%0$33.2MSeries A$20M, Sep 2022
The Logistics Operating System for E-commerce in LatAm
123−22%−20%0$10MUndisclosed round$6.1M, Apr 2025
Source better parts by partnering directly with vetted manufacturers
122+8%+30%1$16.1MSeries A$12.1M, Nov 2025
all-in-one operating system (OS) for telcos
121+34%+51%8$66.3MSeries B$40M, Mar 2026
Account-to-Account payments in Mexico and Chile.
120+11%+36%0$10.7MSeries A$7M, Apr 2024
Infrastructure and tools to build and scale blockchain applications.
110+2%−4%YC$102MSecondary$60M, Jan 2024
Modernizing commercial insurance
107+11%+43%17$61.6MSeries B$42M, Mar 2026
We're Khatabook / OkCredit for Pakistan
102−1%−2%0
Digital bank for teenagers in LatAm connected to prepaid card
102+2%+3%0$25.8MUndisclosed round$10.7M, Apr 2023
India’s first and only marriage super app
100−3%−6%YC$11MUndisclosed round$10K, Jun 2023

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 W21 companies

How many YC W21 companies are there?

334 companies were in Y Combinator's Winter 2021 batch (W21); 226 are active.

Which YC W21 companies are hiring?

46 companies posted roles in the last 60 days, led by REGENT (30 roles), Shepherd (17 roles) and Codingal (9 roles). 77 mark themselves as hiring on YC's directory.

Which YC W21 companies are growing fastest?

By team growth over 6 months (10+ people): OpenCode (+200%), Venu AI (+58%) and Vapi (+50%).

Which YC W21 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Stoke Space ($1B), Nourish ($100M) and Ollama ($65M).

Browse YC companies

By batch

Show fewer

By industry

Show fewer

By location

Show fewer

By founders' past employer

Show fewer