Get an API keyGet an API key14 Y Combinator companies with a founder who worked at TriNet Zenefits before.
Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.
RipplingW17
BIK1
MastraW25
Living Carbon+5%Rippling+5%MastraW25Living Carbon$13M| Company | Batch | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|---|
One place to run all your HR, IT, and Finance. Globally. | W17 | 7,889 | +5% | +23% | 192 | $2.4B | Series G$450M, May 2025 |
Agentic AI CRM for ecommerce | S20 | 353 | +3% | +8% | 1 | $12.8M | Undisclosed round$10.8M, Apr 2022 |
The Javascript framework for building AI agents, from the Gatsby devs | W25 | 62 | +19% | +44% | 0 | $35M | Series A$22M, Apr 2026 |
 Payroll, benefits, state compliance & other bullsh*t for startups | S24Acquired | 62 | −2% | −17% | 0 | $9.1M | Seed$8.6M, Aug 2025 |
 TrueNorth gives truckers a single place to manage their business. | W20Inactive | 46 | +5% | −2% | 0 | ||
maximizing biomass on low quality land | W20 | 39 | +5% | +15% | YC | $49M | Undisclosed round$13M, Apr 2026 |
 Modern customer support platform replacement for Intercom and Zendesk | W22Inactive | 19 | −14% | −34% | 0 | $3.4M | Seed$3.4M, Mar 2022 |
 The easiest way to set up a modern data stack | S20 | 16 | +14% | 0 | $19.1M | Series A$15M, Apr 2022 | |
 Crypto Neo-Bank (WhatsApp moment for bank accounts) | W22Acquired | 8 | −56% | −50% | 0 | $4.3M | Seed$4.3M, Mar 2022 |
 AI-native credentialing and contracting for healthcare | X26 | 4 | 0 | ||||
 DeFi for Everyone | W23Inactive | 4 | 0 | $500K | YC investment$500K, Apr 2023 | ||
 Building the operating system for diagnosis. | W21Inactive | 3 | 0 | SeedMar 2021 | |||
 A new kind of ERP system for factories | F24 | 2 | 0 | $500K | YC investment$500K, Dec 2024 | ||
 ai | W23 | 1 | 0 | $500K | YC investment$500K, 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
14 Y Combinator companies have a founder who worked at TriNet Zenefits; 8 are active.
2 companies posted roles in the last 60 days, led by Rippling (192 roles) and BIK (1 roles). 3 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Mastra (+19%), Living Carbon (+5%) and Rippling (+5%).
Largest latest rounds in the last 12 months, after their YC batch: Mastra ($22M) and Living Carbon ($13M).