Get an API keyGet an API keyThe 3 YC W18 companies whose latest reported round, after their YC batch and in the last 12 months, was the largest.
Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.
| # | Company | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|---|
| 1 |  Collaborative in-browser IDE | 738 | 10 | $873M | Corporate round$400M, May 2026 | ||
| 2 |  We grow cells for biotech companies. | 63 | −19% | −18% | 1 | $102M | Series C$80M, Dec 2025 |
| 3 |  Jasper is a leader in creating content using Artificial Intelligence | 1,019 | −2% | +1% | 2 | $131M | Undisclosed round$400K, Jan 2026 |
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
146 companies were in Y Combinator's Winter 2018 batch (W18); 77 are active.
24 companies posted roles in the last 60 days, led by Replit (10 roles), Swayable (9 roles) and BioRender (9 roles). 25 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Vena Medical (+30%), ZBiotics (+16%) and Runa (+12%).
Largest latest rounds in the last 12 months, after their YC batch: Replit ($400M), Culture Biosciences ($80M) and Jasper.ai ($400K).