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YC companies founded by ex-Brex people

19 Y Combinator companies with a founder who worked at Brex before.

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

Hiring the mostlast 60 days
2 roles
AbundantF24
See all 1
Fastest growingteam, 6 months
+50%
SazabiX26
  1. 2Grep AI+23%
  2. 3Encuadrado+13%
See all 4
Shrinkingteam, 12 months
−5%
PaxS24
See all 1
Raised the mostlast 12 months
$8M
SazabiX26
See all 1
Companies
19
Active
15
Hiring, last 60 days
1
Open roles, 60 days
2
People on these teams
370
Showing 19 of 19 companies
CompanyBatchTeam6 mo12 moOpen rolesTotal raisedLast round
Payments and scheduling for services professionals in LATAM
S21186+13%+28%0$1.6MSeed$1.5M, Nov 2021
Agent simulation and RL for researchers
F2433−6%+3%2$500KYC investment$500K, Dec 2024
AI Native Operating System for Global Trade
S2419−10%−5%YC$5MSeed$4.5M, Apr 2025
AI agents for commercial underwriting at banks and fintechs
S2319−5%+27%YC$3.7MSeed$3.2M, Jul 2024
ModernLoop helps teams automate and streamline recruiting operations
W2119  0$12.1MSeries A$9M, Aug 2022
Modernizing hedge fund back office software and services.
S2118+6%+6%0$3.7MSeed$3.6M, Jun 2022
Self-improving agents that automate your growth bottlenecks
F2616+23%−6%0$6.8MSeed (before YC)$5M, Aug 2023
AI-native observability and security platform
X2612+50% 0$8.5MSeed$8M, Jun 2026
Fig adds visual apps, shortcuts, and autocomplete to your terminal.
S20Acquired10−9% 0$2.4MSeed$2.2M, Aug 2021
AI-powered workflows for energy infrastructure
W249+13%+29%YC$500KNon-equity support$500K, Sep 2025
Don't die of heart disease. Empirical is the first AI-native heart…
S2380%0%0$3.5MSeed$3M, Nov 2025
Bookkeeping, compliance and tax for founders
F244−20%−33%0Pre-seedMay 2025
Open source Voice AI
W23Acquired4  0$3.8MSeed$3.3M, Feb 2024
Stablecoin Global Bank Account
W263  0$500KYC investment$500K, Apr 2026
Voice AI to automate complex phone calls for healthcare providers
S24Acquired3  0$500KYC investment$500K, Sep 2024
Social media content auto-generated with your existing data
W262  0
AI agents for web testing
X252  0$500KYC investment$500K, Jul 2025
We turn traditional companies into AI companies
W252  0$500KYC investment$500K, Mar 2025
AI phone calls for the US healthcare industry
S21Inactive1  0$1.1MSeed$1M, Mar 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 ex-Brex founded YC companies

How many ex-Brex founded YC companies are there?

19 Y Combinator companies have a founder who worked at Brex; 15 are active.

Which ex-Brex founded YC companies are hiring?

1 companies posted roles in the last 60 days, led by Abundant (2 roles). 4 mark themselves as hiring on YC's directory.

Which ex-Brex founded YC companies are growing fastest?

By team growth over 6 months (10+ people): Sazabi (+50%), Grep AI (+23%) and Encuadrado (+13%).

Which ex-Brex founded YC companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Sazabi ($8M).

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