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.
| Company | Batch | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|---|
Payments and scheduling for services professionals in LATAM | S21 | 186 | +13% | +28% | 0 | $1.6M | Seed$1.5M, Nov 2021 |
Agent simulation and RL for researchers | F24 | 33 | −6% | +3% | 2 | $500K | YC investment$500K, Dec 2024 |
AI Native Operating System for Global Trade | S24 | 19 | −10% | −5% | YC | $5M | Seed$4.5M, Apr 2025 |
AI agents for commercial underwriting at banks and fintechs | S23 | 19 | −5% | +27% | YC | $3.7M | Seed$3.2M, Jul 2024 |
ModernLoop helps teams automate and streamline recruiting operations | W21 | 19 | 0 | $12.1M | Series A$9M, Aug 2022 | ||
Modernizing hedge fund back office software and services. | S21 | 18 | +6% | +6% | 0 | $3.7M | Seed$3.6M, Jun 2022 |
Self-improving agents that automate your growth bottlenecks | F26 | 16 | +23% | −6% | 0 | $6.8M | Seed (before YC)$5M, Aug 2023 |
AI-native observability and security platform | X26 | 12 | +50% | 0 | $8.5M | Seed$8M, Jun 2026 | |
Fig adds visual apps, shortcuts, and autocomplete to your terminal. | S20Acquired | 10 | −9% | 0 | $2.4M | Seed$2.2M, Aug 2021 | |
AI-powered workflows for energy infrastructure | W24 | 9 | +13% | +29% | YC | $500K | Non-equity support$500K, Sep 2025 |
Don't die of heart disease. Empirical is the first AI-native heart… | S23 | 8 | 0% | 0% | 0 | $3.5M | Seed$3M, Nov 2025 |
Bookkeeping, compliance and tax for founders | F24 | 4 | −20% | −33% | 0 | Pre-seedMay 2025 | |
Open source Voice AI | W23Acquired | 4 | 0 | $3.8M | Seed$3.3M, Feb 2024 | ||
Stablecoin Global Bank Account | W26 | 3 | 0 | $500K | YC investment$500K, Apr 2026 | ||
Voice AI to automate complex phone calls for healthcare providers | S24Acquired | 3 | 0 | $500K | YC investment$500K, Sep 2024 | ||
Social media content auto-generated with your existing data | W26 | 2 | 0 | ||||
AI agents for web testing | X25 | 2 | 0 | $500K | YC investment$500K, Jul 2025 | ||
We turn traditional companies into AI companies | W25 | 2 | 0 | $500K | YC investment$500K, Mar 2025 | ||
AI phone calls for the US healthcare industry | S21Inactive | 1 | 0 | $1.1M | Seed$1M, Mar 2023 |
Every launched company in YC's public directory, with its batch, status, industry and location. New companies show up the week YC lists them.
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.
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.
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.
# 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
19 Y Combinator companies have a founder who worked at Brex; 15 are active.
1 companies posted roles in the last 60 days, led by Abundant (2 roles). 4 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Sazabi (+50%), Grep AI (+23%) and Encuadrado (+13%).
Largest latest rounds in the last 12 months, after their YC batch: Sazabi ($8M).