11 Y Combinator companies with a founder who worked at The D. E. Shaw Group 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 |
|---|---|---|---|---|---|---|---|
Music Intelligence | S11Acquired | 839 | +5% | +12% | 0 | $77.7M | Undisclosed round$5.8M, Sep 2020 |
HR for small businesses: onboarding, payroll and benefits. | W13Acquired | 214 | −5% | −9% | 0 | $584M | Undisclosed round$500M, Oct 2021 |
The AI Underwriting OS for Commercial, Specialty & E&S insurance | W21 | 167 | +7% | +37% | 0 | $7.7M | Series A$7M, Nov 2025 |
Production-grade unstructured document extraction | S24 | 46 | +31% | +53% | 2 | $4.4M | Seed$3.9M, Feb 2025 |
Personalized learning built for schools | S23 | 37 | +19% | +76% | YC | $15.5M | Series ANov 2025 |
The cheapest way to borrow money | S23 | 26 | +73% | +225% | 1 | $500K | Seed$500K, Jun 2026 |
Open-Core Pricing and Billing Engine | S22Inactive | 22 | 0% | 0% | 0 | SeedOct 2022 | |
Modern customer support platform replacement for Intercom and Zendesk | W22Inactive | 19 | −14% | −34% | 0 | $3.4M | Seed$3.4M, Mar 2022 |
The programming language for AI | W23 | 8 | −33% | YC | SeedJan 2025 | ||
AI coworkers for fraud and compliance teams. | S25 | 7 | +17% | YC | $4M | Seed$4M, Sep 2025 | |
AI-Powered Optical Consulting & Software | X25 | 6 | +20% | YC | $500K | YC investment$500K, Jun 2025 |
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
11 Y Combinator companies have a founder who worked at The D. E. Shaw Group; 7 are active.
2 companies posted roles in the last 60 days, led by Pulse (2 roles) and SyntheticFi (1 roles). 6 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): SyntheticFi (+73%), Pulse (+31%) and Flint (+19%).
Largest latest rounds in the last 12 months, after their YC batch: Pibit.ai ($7M) and SyntheticFi ($500K).