Get an API keyGet an API key11 Y Combinator companies with a founder who worked at Zynga before.
Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.
Gym ClassW22
MagneticS25| Company | Batch | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|---|
Connecting the world by simulating it | W22 | 107 | +1% | +3% | YC | ||
 Build and manage distributed teams | S15Acquired | 89 | −1% | −6% | 0 | $32.6M | Series B$20M, Aug 2017 |
 LendUp is a socially responsible company on a mission to redefine… | W12Inactive | 22 | +22% | +22% | 0 | $362M | Undisclosed round$100M, Jun 2017 |
 Building the Operating System for the Concert & Live Events Industry. | W16 | 14 | 0 | $1.8M | Seed$1M, Apr 2019 | ||
 Cratejoy is the platform for subscriptions | S13 | 11 | −8% | −15% | 0 | $10.8M | Undisclosed round$4.5M, May 2015 |
AI Tax Preparer for CPA firms | S25 | 9 | +29% | YC | $5.7M | Seed$5.2M, Jun 2026 | |
 Software eats custom framing | W15 | 5 | 0% | 0% | 0 | SeedMar 2015 | |
 Fastest Storage Engine with the Best Compression, we enables direct… | W17Acquired | 4 | 0 | $120K | YC investment$120K, Mar 2017 | ||
 Make your LLMs 3x faster. | W24 | 2 | 0 | Pre-seedApr 2024 | |||
 Mobile games company | W11 | 1 | YC | ||||
 Recover revenue lost to ad blockers | S16Inactive | 0 | $1.2M | YC investment$120K, Aug 2016 |
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 Zynga; 7 are active.
We found no job postings for these companies in the last 60 days. 3 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Gym Class (+1%).
Largest latest rounds in the last 12 months, after their YC batch: Magnetic ($5.2M).