Get an API keyGet an API keyThe 21 YC S17 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 |  Build better banking | 58 | +38% | +32% | 9 | $4M | Undisclosed round$2M, Mar 2022 |
| 2 |  Creating a new form of air transportation to advance our civilization | 64 | +16% | +45% | 8 | $58.1M | Debt$5M, Jun 2025 |
| 3 |  The best way to build Voice AI apps | 116 | +16% | +8% | 7 | $113M | Series C$50M, Dec 2023 |
| 4 |  The genetic testing platform detecting and measuring disease. | 866 | +13% | +26% | 21 | $426M | Series D$130M, Jun 2024 |
| 5 |  Marketplace for local activities. | 37 | +12% | +28% | 9 | $120K | YC investment$120K, Aug 2017 |
| 6 |  Dating & relationship coaching sessions for individuals and couples | 61 | +11% | +5% | 1 | $2M | Seed$2M, Jan 2018 |
| 7 |  Next-gen digital payments provider for India. | 982 | +8% | +8% | 1 | $93.9M | Series C$53M, Feb 2025 |
| 8 |  The financial foundation for every real estate development decision | 47 | +7% | 0 | $9.9M | Debt$1.8M, May 2023 | |
| 9 |  AI platform for unifying codes, assemblies, products, and specs | 48 | +7% | +33% | 3 | $7.6M | Series A$3.5M, Aug 2024 |
| 10 |  Autonomous electric airplanes | 140 | +6% | +40% | 8 | $88.1M | Series B$40M, Sep 2024 |
| 11 |  Just Appraised makes software for local governments. | 140 | +6% | +5% | 1 | $24.8M | Series A$12.3M, Apr 2024 |
| 12 |  First financial Superapp of Latin America | 46 | +5% | +10% | 0 | $15.8M | Corporate round$700K, Mar 2026 |
| 13 |  Transforming cities and rural areas through AV transit and technology | 369 | +4% | +7% | 9 | $310M | Corporate round$7M, Oct 2025 |
| 14 |  Jerry is building the AI agent to manage all your physical assets. | 409 | +4% | +19% | 47 | $242M | Series C$110M, Aug 2023 |
| 15 |  OneLocal is a CRM for local businesses. | 86 | +2% | −4% | 2 | Series AOct 2019 | |
| 16 |  Pop Meals is a restaurant chain without chefs. All recipes are… | 134 | +2% | YC | $27M | Series B$18M, Feb 2020 | |
| 17 |  Customized fertility benefits for modern companies. | 632 | +2% | +11% | 3 | $114M | Series C$75M, Aug 2021 |
| 18 |  AI-Powered Building Management | 109 | +2% | −8% | 1 | $82.6M | Series C$60M, Nov 2021 |
| 19 |  Where Single Muslims meet | 187 | +2% | +10% | 2 | $10.9M | Series A$7M, Jan 2024 |
| 20 |  The operating system powering ecommerce fulfillment | 82 | +1% | +3% | 3 | $46.5M | Series B$31M, Mar 2021 |
| 21 |  The first public safety operating system that eliminates crime. | 1,446 | +1% | +6% | 32 | $1.2B | Series I$200M, Apr 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
125 companies were in Y Combinator's Summer 2017 batch (S17); 54 are active.
23 companies posted roles in the last 60 days, led by Jerry (47 roles), Flock Safety (32 roles) and BillionToOne (21 roles). 19 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Prelim (+38%), Skyways (+16%) and AssemblyAI (+16%).
Largest latest rounds in the last 12 months, after their YC batch: Flock Safety ($200M), Standard AI ($900K) and tpaga ($700K).