Get an API keyGet an API key10 Y Combinator companies with a founder who worked at Workday before.
Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.
PloyX26
Klarify2PloyX26
Bottomless+5%PloyX26| Company | Batch | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|---|
Ploy turns your website into your company's growth engine. | X26 | 27 | +93% | 2 | $27M | Seed$27M, Jun 2026 | |
Building the first sensor enabled marketplace for repeat purchases | W19 | 20 | +5% | +11% | 0 | $6.8M | Series A$4.5M, Jan 2021 |
 AI voice for property managers | S25 | 11 | YC | $500K | YC investment$500K, Sep 2025 | ||
 Pediatric digital therapeutic for the +100M families in the US | W22 | 11 | −15% | −27% | 0 | ||
 Unifying how the optical industry does business. | W23 | 6 | 0% | +20% | 0 | $3.7M | Seed$3.7M, Oct 2023 |
 Truckload Planning at Machine Precision | S25 | 5 | 0 | ||||
 Procure the right software 5x faster | W21 | 5 | 0% | −62% | 0 | SeedJan 2021 | |
AI Agent for Therapists | X26 | 4 | −33% | −43% | 2 | $500K | YC investment$500K, May 2026 |
 Mass-deployable radars for air defense | S26 | 3 | YC | ||||
 AI-Native Enterprise Codebase Maintenance | W23Inactive | 1 | 0 | $1.9M | Pre-seed$1.9M, Apr 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 Workday; 9 are active.
2 companies posted roles in the last 60 days, led by Ploy (2 roles) and Klarify (2 roles). 4 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Ploy (+93%) and Bottomless (+5%).
Largest latest rounds in the last 12 months, after their YC batch: Ploy ($27M).