Get an API keyGet an API key10 Y Combinator companies with a founder who worked at Plaid before.
Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.
ExaS21ExaS21
Haven+11%ExaS21| Company | Batch | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|---|
Web search rebuilt for LLMs | S21 | 243 | +46% | +117% | 28 | $357M | Series C$250M, May 2026 |
Homeownership reimagined for the 21st century. | W20 | 31 | +11% | +15% | YC | $13.5M | Series A$8M, Nov 2022 |
 Simulation environments for training & evaluating autonomous agents | W26 | 8 | YC | $500K | YC investment$500K, Mar 2026 | ||
 Stripe for Credit - Trusted Credit Compliance Partner | W23 | 8 | −20% | −20% | YC | $2.9M | Seed$2.4M, Jan 2024 |
 AI agents that run onboarding, adoption, and renewals | F26 | 6 | +20% | 0 | Pre-seed (before YC)Jan 2025 | ||
 Relationship Coverage for Deal Teams | W23 | 6 | 0% | −14% | 0 | $500K | YC investment$500K, Apr 2023 |
 Data pipeline for your security data lake. | S21Acquired | 5 | 0 | $6M | Seed$6M, Mar 2024 | ||
 Kiwi is your GTM agent's favorite data engineer. | F26 | 1 | 0 | ||||
 AI agents for global trade compliance | W25 | 1 | 0 | ||||
 Incentives and financing for energy efficiency upgrades | S23Inactive | 1 | 0 | $500K | YC investment$500K, Sep 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
10 Y Combinator companies have a founder who worked at Plaid; 8 are active.
1 companies posted roles in the last 60 days, led by Exa (28 roles). 3 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Exa (+46%) and Haven (+11%).
Largest latest rounds in the last 12 months, after their YC batch: Exa ($250M).