Get an API keyGet an API keyThe 17 YC W15 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 |  Medical device that provides a more effective, less invasive… | 48 | +12% | +41% | 1 | $134M | Series D$52M, Oct 2026 |
| 2 |  Self-Checkout using Computer Vision. | 130 | +8% | +13% | YC | $73.7M | Series B$62.5M, May 2022 |
| 3 |  Meet Tara AI, your new engineering efficiency co-pilot. | 27 | +8% | +17% | 0 | $13M | Non-equity support$10M, Mar 2024 |
| 4 |  We automate operations for hospitals and health systems | 271 | +7% | +19% | 13 | $203M | Series D$85M, Jan 2025 |
| 5 |  AI-powered technology enabler and digital transformer of American… | 129 | +7% | +11% | 0 | $599M | Series H$50M, Feb 2026 |
| 6 |  Cloud solutions for the construction industry. | 4,390 | +6% | +13% | 262 | $6.3B | Debt$2.8B, Dec 2025 |
| 7 |  Mobile Productivity(Slack for mobile workforces) | 17 | +6% | +6% | 0 | $161K | Non-equity support$41K, Jul 2019 |
| 8 |  SIRUM is a “match.com” for unused medicine. We connect institutional… | 53 | +6% | 0 | $120K | YC investment$120K, Mar 2015 | |
| 9 |  An end-to-end digital banking solution for banks and credit unions | 72 | +4% | −9% | 6 | $14.3M | Undisclosed round$12.5M, Mar 2023 |
| 10 |  Personalized drug discovery for blood cancer. | 29 | +4% | +4% | YC | $57.2M | Series B$189K, Jul 2022 |
| 11 |  Live home fitness training powered by computer vision. | 218 | +3% | +3% | YC | $299M | Series C$220M, Apr 2021 |
| 12 |  Laundry & Dry Cleaning delivered. | 47 | +2% | +2% | 0 | $13.8M | Series B$6.5M, Mar 2018 |
| 13 |  Observability platform to control all of your log data | 61 | +2% | −8% | 0 | $108M | Series D$50M, Dec 2021 |
| 14 |  Inspection software for renewable energy & sustainable infrastructure | 706 | +2% | +1% | 1 | $174M | Undisclosed round$60M, Mar 2025 |
| 15 |  A complete DevOps platform delivered as a single application. | 3,477 | +1% | +7% | 230 | $414M | Post-IPO equity$268M, Feb 2022 |
| 16 |  Extremely talented assistants for busy people | 1,877 | +1% | +3% | YC | $12.3M | Undisclosed round$139K, Jun 2024 |
| 17 |  Turning company knowledge into expert teams | 517 | +1% | +3% | 11 | $78.4M | Series B$62M, Dec 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
110 companies were in Y Combinator's Winter 2015 batch (W15); 40 are active.
10 companies posted roles in the last 60 days, led by EquipmentShare (262 roles), GitLab (230 roles) and Razorpay (17 roles). 9 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Zenflow (+12%), Mashgin (+8%) and Tara AI (+8%).
Largest latest rounds in the last 12 months, after their YC batch: Zenflow ($52M) and GrubMarket ($50M).