Get an API keyGet an API keyThe 8 YC S26 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 |  Metal manufacturing, faster, cheaper, and more versatile. | 16 | +167% | 0 | |||
| 2 |  AI agents to run primary healthcare operations | 16 | +45% | +100% | 0 | $500K | YC investment$500K, Jun 2026 |
| 3 |  The AI operating system for radiology networks | 11 | +38% | 0 | $500K | YC investment$500K, Sep 2026 | |
| 4 |  Agentic OS for e-commerce operations | 18 | +29% | +125% | YC | $500K | YC investment$500K, Sep 2026 |
| 5 |  Network for Physical AI Data Business | 10 | +25% | +100% | 1 | ||
| 6 |  Rocket cargo delivery to contested environments | 16 | +23% | +33% | 2 | $11M | Seed$11M, Sep 2026 |
| 7 |  We are building an AI-native telemedicine clinic for addiction. 🌻 | 71 | +18% | +73% | 1 | $1.5M | Seed (before YC)$1.5M, Oct 2025 |
| 8 |  Autonomous construction on Earth and beyond | 15 | +15% | +50% | 2 | $4.5M | YC investment$500K, Aug 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
227 companies were in Y Combinator's Summer 2026 batch (S26); 226 are active.
10 companies posted roles in the last 60 days, led by Bernard (4 roles), Nori (3 roles) and Hop Aero (2 roles). 47 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Ultrasonium (+167%), Care GP (+45%) and Avoca Systems (+38%).
Largest latest rounds in the last 12 months, after their YC batch: Hop Aero ($11M), Robocurve ($10M) and OpenRelay ($9.8M).