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S21 companies that shrank this year

The 43 YC S21 companies whose team shrank the most in the last 12 months (active companies that had 20+ people a year ago).

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

Showing 43 of 43 companies on this list
#CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
1
Secoda is the AI layer for your Analytics
18 −66%0$16.4MSeries A$14.1M, Sep 2023
2
We are the frictionless way for companies to make payments.
20−9%−57%0$3.7MSeed$3.6M, Jan 2023
3
Affogato AI, Your Agent for instant TikToks, Reels, and ads.
10−9%−50%0SeedJan 2024
4
Using the immune system to cure disease
22−31%−49%7$25.6MSeries A$21M, Jun 2025
5
Helping Indians make better financial decisions.
37−21%−45%0$125KYC investment$125K, Nov 2021
6
Self-Service Data Prep and Blend Built for Data Teams.
15−32%−40%0
7
Tech-powered equipment rentals in Latam.
14−12%−39%0$4.6MSeed$4.5M, Sep 2021
8
Datlo helps companies increase sales and expand through data
50+4%−24%0$838KSeed$713K, May 2025
9
Security Delivery Platform to orchestrate AI agents for Service…
19 −24%0$3.7MSeed$3.3M, Oct 2024
10
The AI Cowork for big data
16−16%−24%YC$6.4MSeed$6.3M, Nov 2022
11
Online Coding School for Kids 8-16
21−5%−22%YC$1.4MSeed$1.3M, Feb 2023
12
First ECG AI to go beyond diagnostics and recommend treatment
34−19%−19%YC$135KGrant$10K, Nov 2023
13
Online cohort based courses for architects, engineers and designers…
261−7%−16%0$1.2MSeed$1.2M, May 2023
14
AI to understand and automates the physical world
20−9%−13%1SeedSep 2022
15
Instant lab tests on your smartphone
42−2%−12%YC$2.4MSeed$2M, Feb 2024
16
Get matched with top 1% of talents in 24h
134−10%−11%1$2.9MNon-equity support$800K, Mar 2022
17
A national network of microschools bringing school choice to every…
34 −11%YC$1.6MSeed$1.5M, Jan 2024
18
The world's largest financial education and community app for women
44−2%−10%0$17.3MSeries A$11.1M, Jul 2024
19
Retaining employees in LatAm via education
53 −10%0$3.9MSeed$2.4M, Oct 2021
20
On-demand auto maintenance & repairs
60−3%−9%0$5.2MSeed$2.4M, Sep 2023
21
We make software for bookkeepers.
81−2%−9%1$15.1MSeries A$6.5M, Dec 2025
22
Autonomous team of AI agents that runs the entire hospital operations
71+3%−9%YC$30MUndisclosed round$21.8M, Oct 2025
23
One-stop-shop for restaurants to operate and grow their business.
51−6%−9%1$5.6MSeed$5.3M, Oct 2021
24
Corporate Card solution for Indian businesses
127−8%−9%0$38.3MDebt$7.1M, May 2022
25
Gusto for India
88−3%−8%1$4.1MSeed$4M, Sep 2021
26
Discovering drugs that target the DNA regulome
24−8%−8%0$27.8MSeed$11.2M, Sep 2026
27
Super AI Accountant for SMBs
79−7%−7%0$2.1MNon-equity support$2M, Aug 2026
28
Uber for Healthcare in Latinamerica
71−1%−7%0$43.1MSeries B$750K, Jan 2026
29
Smart micro financing for everyone
81−9%−6%2$167MDebt$22.9M, Jun 2026
30
Super Hyperlocal Marketplace for SMEs in Indonesia
72−4%−5%0$125KYC investment$125K, Aug 2021
31
Latin America's Deposits Marketplace for Banks
73+3%−5%0$2MSeed$1M, Apr 2025
32
Learning platform for job seekers with job applications automation
533−5%−5%0$9.5MSeries A$8M, Mar 2023
33
1:1 ADHD coaching, 5-10X More affordable than alternatives
57 −5%YC$3.6MSeed$25K, Sep 2024
34
Home Internet for urban Latin America
19−5%−5%0$4.1MSeed$4.1M, Aug 2021
35
SaaS Platform to manage IT and buy business software
21−5%−5%0$125KYC investment$125K, Nov 2021
36
We help automotive aftermarket brands to supply and sell parts online
66−3%−4%0$125KUndisclosed round$125K, Jan 2023
37
Programmable biology company for psychoactive effect design
23−4%−4%0$24.3MSeed$12.7M, Feb 2025
38
The B2B Payments Platform
37−3%−3%2$252MDebt$15M, Jul 2024
39
Chime for Canada, starting with cash advances
37 −3%4$125KYC investment$125K, Jan 2023
40
Sell anything
74−7%−1%1$4.2MSeed$4.2M, Feb 2023
41
Financial data your AI can actually trust
82+1%−1%0$3MSeed$1M, Aug 2021
42
A mobile app. It allows employees to get paid their salary on-demand.
84+5%−1%1$64MUndisclosed round$21.7M, Jun 2025
43
Water risk mitigation for industrial sites
102 −1%0$18.3MNon-equity support$150K, Sep 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 S21 companies

How many YC S21 companies are there?

390 companies were in Y Combinator's Summer 2021 batch (S21); 284 are active.

Which YC S21 companies are hiring?

50 companies posted roles in the last 60 days, led by Stepful (36 roles), Exa (28 roles) and ARQ (24 roles). 85 mark themselves as hiring on YC's directory.

Which YC S21 companies are growing fastest?

By team growth over 6 months (10+ people): Hirebolt (+100%), Aqua (+93%) and Confido (+89%).

Which YC S21 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Exa ($250M), Slash ($100M) and Turion Space ($75M).

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