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YC companies founded by ex-Square people

26 Y Combinator companies with a founder who worked at Square before.

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

Hiring the mostlast 60 days
45 roles
Apollo.ioW16
  1. 2Faire17
  2. 3Outschool7
See all 4
Fastest growingteam, 6 months
+44%
Apollo.ioW16
  1. 2Clad+30%
  2. 3Zippi+23%
See all 7
Raised the mostlast 12 months
$10M
RisottoW24
See all 1
Companies
26
Active
20
Hiring, last 60 days
4
Open roles, 60 days
70
People on these teams
4,474
Showing 26 of 26 companies
CompanyBatchTeam6 mo12 moOpen rolesTotal raisedLast round
Apollo is the foundation of your entire go-to-market strategy.
W16987+44%+54%45$251MSeries D$100M, Aug 2023
Agentic AI CRM for ecommerce
S20353+3%+8%1$12.8MUndisclosed round$10.8M, Apr 2022
Payment Platform for LatAm Micro and Small Businesses
S19116+23%+26%YC$88.5MDebt$42.3M, Feb 2026
AI agent for community management
W22Acquired48+33%+109%0
AI tax filing for complex returns
W1940+3%+11%0$15.8MSeries A$13M, Apr 2021
Complete QA platform for voice agents
S2420+18%+43%YC$4.3MSeed$3.8M, Dec 2024
Risotto auto-solves IT support requests using AI
W2419+6%+111%0$10.5MSeed$10M, Jan 2026
Billing and project management for utility construction
W2313+30%+30%YC$2.7MSeed$2.2M, Apr 2023
The AI Platform for Healthcare Education
S2312−14% 0SeedSep 2023
Transforming Finances, Maximizing Your Money Potential.
W22Inactive12 +33%0Pre-seedMay 2022
Build and ship native Swift apps with AI
S259+29% 0
Next-Gen Financial Analysis and Reporting with AI Agents
S21Inactive9+50%+80%0$2.5MSeed$2.5M, Jan 2025
Protecting your employees against online harassment
S189+29%+29%0$1MSeed$1M, Sep 2023
Real-time governance for enterprise communications
F2460%−14%YC$500KYC investment$500K, Jan 2025
Bookkeeping, compliance and tax for founders
F244−20%−33%0Pre-seedMay 2025
AI-powered order taker for restaurant drive-thrus
W23Acquired4 −20%0$500KYC investment$500K, Jan 2024
Decision infrastructure for investment firms
W23Acquired4−64%−56%0Pre-seedJan 2023
Workflow automation for healthcare providers
S224−33%−56%0$3.5MSeed$3M, Nov 2023
Classify Anything
W223  0$500KYC investment$500K, Mar 2022
AI Agents for Platform Engineering
F252  0SeedNov 2025
Observability and evaluation platform for LLM apps.
S232  0$500KYC investment$500K, Sep 2023
AI Powered Product Discovery
W23Inactive2  0$2MSeed$1.5M, Jun 2023
AI-Native Medical Billing Services
W261  0$500KYC investment$500K, Mar 2026
Let your camera understand the world
F241  0$500KYC investment$500K, Dec 2024
A live online learning platform that empowers kids ages 3-18.
W161,505  7$240MSeries D$110M, Oct 2021
The global online platform empowering independent retail.
W171,289  17$1.7BSecondary$416M, Nov 2025

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 ex-Square founded YC companies

How many ex-Square founded YC companies are there?

26 Y Combinator companies have a founder who worked at Square; 20 are active.

Which ex-Square founded YC companies are hiring?

4 companies posted roles in the last 60 days, led by Apollo.io (45 roles), Faire (17 roles) and Outschool (7 roles). 7 mark themselves as hiring on YC's directory.

Which ex-Square founded YC companies are growing fastest?

By team growth over 6 months (10+ people): Apollo.io (+44%), Clad (+30%) and Zippi (+23%).

Which ex-Square founded YC companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Risotto ($10M).

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