Get an API keyGet an API keyThe 6 YC W13 companies whose team grew the most in the last 6 months (active companies with 10+ people).
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 |  RADAR is building technology to completely transform the in-store… | 241 | +10% | +23% | 4 | $310M | Series B$170M, May 2026 |
| 2 |  Watsi is the first global crowdfunding platform for medical… | 35 | +6% | +6% | 0 | $1.2M | Grant$1.2M, Mar 2013 |
| 3 |  The leader in automated data movement | 1,934 | +5% | +13% | 44 | $853M | Debt$125M, May 2023 |
| 4 |  We're Robinhood for pre-IPO startups. Everyone can invest $100. | 139 | +4% | +13% | YC | $25.3M | Undisclosed round$3.5M, Nov 2024 |
| 5 |  Papyrus → Parchment → Paper → Padlet | 81 | +1% | +8% | 2 | $12.7M | Series A$11M, Apr 2019 |
| 6 |  Empowering restaurants and small food makers to ship nationwide. | 115 | +1% | −3% | YC | $133M | Series C$100M, May 2021 |
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
46 companies were in Y Combinator's Winter 2013 batch (W13); 17 are active.
6 companies posted roles in the last 60 days, led by Fivetran (44 roles), InfluxData (9 roles) and RADAR (4 roles). 7 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): RADAR (+10%), Watsi (+6%) and Fivetran (+5%).
Largest latest rounds in the last 12 months, after their YC batch: RADAR ($170M).