Get an API keyGet an API keyThe 24 YC W16 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 |  Apollo is the foundation of your entire go-to-market strategy. | 987 | +44% | +54% | 45 | $251M | Series D$100M, Aug 2023 |
| 2 |  We make vanpool simple. | 36 | +24% | +38% | 0 | Series ANov 2019 | |
| 3 |  Building foundational AI for speech transcription and understanding. | 387 | +23% | +64% | 42 | $216M | Series C$130M, Aug 2026 |
| 4 |  Detect Gunshots | Inform Law Enforcement | Empower First Responders | 51 | +19% | +31% | 0 | $2.1M | Seed$2.1M, Aug 2016 |
| 5 |  Self-Driving Customer Care | 310 | +16% | +34% | 14 | $217M | Series C$110M, Apr 2026 |
| 6 |  Economically and environmentally sustainable supersonic travel | 365 | +10% | +22% | 14 | $732M | Undisclosed round$300M, Dec 2025 |
| 7 |  AI-powered platform for Accessible and Personalized Breast Health… | 26 | +8% | −19% | YC | $6.4M | Undisclosed round$1.8M, Oct 2025 |
| 8 |  Block bots & bad behavior | 56 | +8% | +24% | YC | $11.6M | Undisclosed round$9.2M, Jan 2021 |
| 9 |  Advanced satellites for high orbits. | 564 | +7% | +20% | 103 | $1.7B | Debt$468M, Sep 2026 |
| 10 |  Conversational Voice and Multimodal AI built with Open Source | 168 | +7% | +23% | 0 | $62.2M | Series B$40M, Nov 2021 |
| 11 |  We make beautiful connected light switches that allow you to control… | 64 | +7% | −2% | 1 | $22.2M | Series B$12.5M, Mar 2021 |
| 12 |  Building humanity’s multiplanetary future. | 2,015 | +6% | +20% | 244 | $1.4B | Series F$20M, Nov 2023 |
| 13 |  Get more leads. Make more money. | 1,661 | +6% | +12% | 36 | $423M | Undisclosed round$201M, Oct 2022 |
| 14 |  Protects organizations from getting breached through their APIs. | 208 | +4% | +6% | 1 | $271M | Undisclosed round$140M, Sep 2022 |
| 15 |  We give Black software engineers support they need to advance in tech. | 60 | +3% | +2% | 0 | $100K | Grant$100K, Aug 2016 |
| 16 |  All-In-One Business Operating System by PocketSuite | 32 | +3% | +3% | YC | $2M | Grant$500K, Nov 2019 |
| 17 |  Building the Operating System for B&M Retail using Deep Learning | 131 | +3% | +2% | 33 | $41.9M | Series B$25.9M, Nov 2021 |
| 18 |  AI-First Creative Partner for Enterprise Teams | 1,036 | +3% | +8% | 5 | $35.1M | Series A$30M, Dec 2021 |
| 19 |  Mason is the fastest way to take smart devices from idea to end user | 251 | +2% | +2% | YC | $25.1M | Undisclosed round$25M, Dec 2020 |
| 20 |  We're creating the loudest battery-driven speaker on the market | 89 | +2% | +2% | YC | $22.4M | Undisclosed round$8.6M, Jun 2023 |
| 21 |  AI + Robotics for the Built World | 318 | +2% | −5% | 11 | $347M | Undisclosed round$125M, Aug 2026 |
| 22 |  Copia's a for-profit technology company that solves food waste &… | 120 | +2% | +4% | 0 | $4.7M | Seed$150K, Dec 2021 |
| 23 |  On-demand delivery and financial services for Latin America. | 15,009 | +1% | +7% | 18 | $2.6B | Debt$25M, Oct 2025 |
| 24 |  Video infrastructure for developers | 165 | +1% | +9% | 3 | $174M | Series D$105M, Apr 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
122 companies were in Y Combinator's Winter 2016 batch (W16); 58 are active.
23 companies posted roles in the last 60 days, led by Relativity Space (244 roles), Astranis (103 roles) and Apollo.io (45 roles). 20 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Apollo.io (+44%), MagicBus (+24%) and Deepgram (+23%).
Largest latest rounds in the last 12 months, after their YC batch: Boom ($300M), Deepgram ($130M) and Gecko Robotics ($125M).