The 89 YC W21 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 | The open source AI coding agent | 21 | +200% | 0 | |||
| 2 | Meet qualified leads in person by automating conference production | 30 | +58% | +50% | YC | SeedMar 2021 | |
| 3 | Voice AI for developers. | 150 | +50% | +114% | 4 | $70.6M | Series B$50M, May 2026 |
| 4 | AI Agents for Oncology EHRs | 98 | +48% | +72% | 3 | $37.1M | Series B$22M, May 2026 |
| 5 | Recover from any outage in 10 minutes or less. | 51 | +46% | +65% | 0 | $26.2M | Series A$15.9M, Jun 2026 |
| 6 | The one-stop-shop for auto-parts in Mexico. | 53 | +43% | +66% | 0 | $5.5M | Seed$3M, Jan 2023 |
| 7 | AI recruiter that runs outbound sourcing campaigns to find top talent | 266 | +38% | +62% | YC | $2.2M | Seed$2.2M, Aug 2023 |
| 8 | Get up and running with large language models. | 77 | +38% | +64% | 0 | $80.1M | Series B$65M, Jul 2026 |
| 9 | AI tax workflow platform for accounting firms | 59 | +37% | +16% | YC | $4.3M | Series A$4.3M, Aug 2025 |
| 10 | The Most-Loved IT Documentation Platform | 42 | +35% | +50% | 3 | $5.1M | Series A$5M, May 2023 |
| 11 | all-in-one operating system (OS) for telcos | 121 | +34% | +51% | 8 | $66.3M | Series B$40M, Mar 2026 |
| 12 | The highest-accuracy global weather data from low-cost flat satellites | 12 | +33% | +50% | 0 | SeedApr 2024 | |
| 13 | The AI-native FP&A platform that helps Finance teams drive business… | 196 | +32% | +54% | 4 | ||
| 14 | The data layer for physical AI | 231 | +31% | +75% | 3 | $110M | Series C$60M, Feb 2026 |
| 15 | Ramp for Indian Businesses - UPI Wallets for Employee Expenses | 43 | +30% | +87% | 0 | ||
| 16 | 33 | +22% | +27% | YC | $5.3M | Seed$5.2M, Jul 2023 | |
| 17 | Admin automation for healthcare | 145 | +22% | +54% | 1 | $33.1M | Series B$30M, Feb 2025 |
| 18 | SpruceID lets users control their data across the web. | 36 | +20% | +20% | 4 | $41.6M | Series A$34M, Apr 2022 |
| 19 | Interactive product demos | 73 | +20% | +30% | 0 | $5.4M | Seed$4.2M, Mar 2022 |
| 20 | The OS for Embedded Telecom | 318 | +20% | +51% | YC | $97M | Series B$73M, Dec 2024 |
| 21 | Government-funded online addiction treatment | 45 | +18% | +41% | 7 | SeedMar 2021 | |
| 22 | Pay, Get Paid and Extend Cash Flow using your Credit Card as… | 13 | +18% | +8% | 0 | $125K | YC investment$125K, Jan 2023 |
| 23 | Internet for the urban developing world. | 382 | +18% | +41% | 0 | $75.6M | Series B$40M, Mar 2026 |
| 24 | Protecting the grid today, preparing the grid for tomorrow | 221 | +18% | +51% | 1 | $97.2M | Series B$55M, Nov 2025 |
| 25 | Seamless mobility to, through, and from space. It starts with 100%… | 451 | +17% | +33% | 4 | $2.4B | Series E$1B, Sep 2026 |
| 26 | Software for pharmacies to move beyond dispensing | 77 | +17% | +18% | YC | $3.5M | Debt$2.7M, Aug 2025 |
| 27 | Software orchestrated mass production of plastics | 64 | +16% | +49% | 2 | $45.3M | Series A$25M, Jun 2025 |
| 28 | A digital wallet for the Middle East & North Africa | 324 | +15% | +45% | 5 | $30.5M | Series A$22M, May 2026 |
| 29 | Full-stack VLEO satellite missions | 78 | +13% | +20% | 6 | $103M | Series A$35M, Jan 2024 |
| 30 | AI-Powered HRIS for high performing teams | 61 | +13% | +17% | 2 | $20M | Series A$15M, Oct 2022 |
| 31 | Modular carbon capture | 79 | +13% | +23% | 0 | $5.5M | Series A$5.5M, Feb 2024 |
| 32 | Modernizing commercial insurance | 107 | +11% | +43% | 17 | $61.6M | Series B$42M, Mar 2026 |
| 33 | Operating System for Hotels and Vacation Rentals | 89 | +11% | +10% | YC | $2.4M | Seed$2M, Jun 2021 |
| 34 | Account-to-Account payments in Mexico and Chile. | 120 | +11% | +36% | 0 | $10.7M | Series A$7M, Apr 2024 |
| 35 | Automated investing for the next generation 💸 | 40 | +11% | +29% | 1 | $44.3M | Debt$22.5M, Feb 2026 |
| 36 | All-electric seagliders for fast, affordable regional transportation | 288 | +11% | +15% | 30 | $327M | Debt$120M, Aug 2026 |
| 37 | The unbiased AI and data layer for skin health. | 31 | +11% | +7% | 0 | $965K | Pre-seed$840K, Dec 2021 |
| 38 | The AI operating system for restaurants | 214 | +10% | +13% | 1 | $2.3M | Seed$2.3M, Apr 2021 |
| 39 | API for developers and AIs to access health data | 22 | +10% | +5% | YC | $2.8M | Seed$2.8M, Jun 2021 |
| 40 | AI workers for the logistics industry. | 11 | +10% | −21% | YC | $6.5M | Seed$6.5M, Sep 2023 |
| 41 | Helping B2B co's sync data to their customers | 11 | +10% | +10% | YC | $5.2M | Seed$5.2M, Sep 2023 |
| 42 | Code review for DevOps tasks | 23 | +10% | +44% | 0 | SeedOct 2025 | |
| 43 | Shopify for Beauty and Wellness businesses in Latam | 186 | +9% | +23% | 1 | $42.8M | Series B$35M, Aug 2025 |
| 44 | The digital bank for small businesses in the Philippines. | 35 | +9% | +9% | 0 | $1.6M | Seed$1.6M, Jul 2021 |
| 45 | Analyzing EHR and messaging data to predict disease before it occurs. | 12 | +9% | YC | $125K | YC investment$125K, Jan 2023 | |
| 46 | We help people resolve debt. | 133 | +9% | +45% | YC | Series AMay 2026 | |
| 47 | Makes it easy for tech platforms to embed insurance into products | 64 | +8% | +8% | 2 | $28.8M | Series A$25M, Feb 2022 |
| 48 | Juicy marbles makes thick juicy and marbled plant based steaks. | 39 | +8% | +5% | 0 | $4.5M | Seed$4.5M, Nov 2021 |
| 49 | A better way to write. | 13 | +8% | 0 | Pre-seedNov 2022 | ||
| 50 | The super app for pets | 13 | +8% | +44% | 0 | $1.3M | Pre-seed$1.3M, Nov 2021 |
| 51 | Source better parts by partnering directly with vetted manufacturers | 122 | +8% | +30% | 1 | $16.1M | Series A$12.1M, Nov 2025 |
| 52 | Better Business on WhatsApp | 42 | +8% | +20% | 0 | $1.4M | Seed$1.4M, Jul 2022 |
| 53 | The modern, open source, self-hosted AI customer support platform | 14 | +8% | +17% | 0 | $1.7M | Seed$1.6M, Sep 2021 |
| 54 | The AI Underwriting OS for Commercial, Specialty & E&S insurance | 167 | +7% | +37% | 0 | $7.7M | Series A$7M, Nov 2025 |
| 55 | Generative AI powered Shopify for home service professionals | 168 | +7% | +27% | 5 | $44M | Series B$27M, Aug 2025 |
| 56 | Embedded lending infrastructure for software companies | 95 | +7% | −6% | 0 | $39.5M | Undisclosed round$15M, May 2025 |
| 57 | Scheduling and workforce management SaaS for home healthcare providers | 32 | +7% | +14% | 4 | $14.4M | Series A$10M, May 2025 |
| 58 | GreaseBoss verifes industrial machinery is greased correctly | 16 | +7% | 0 | $1M | Seed$1M, Mar 2021 | |
| 59 | Your AI GTM platform for In-Person Events | 134 | +6% | +19% | 5 | $2.4M | Seed$2.2M, Mar 2021 |
| 60 | Buy Now Pay Later + Cash Advance for Household Essentials | 17 | +6% | +89% | 0 | $175K | YC investment$100K, Jan 2021 |
| 61 | Making Restaurants more data-driven! | 35 | +6% | +13% | 0 | Pre-seed (before YC)Dec 2020 | |
| 62 | Marketplace for construction machines | 19 | +6% | +46% | 0 | $125K | YC investment$125K, Mar 2021 |
| 63 | Affordable insurance for the next billion Indians | 39 | +5% | −5% | 0 | $6.5M | Undisclosed round$3.5M, Jan 2024 |
| 64 | AI-powered video platform for Internal Comms and HR teams | 20 | +5% | +11% | 0 | $4.1M | Undisclosed round$3.2M, Mar 2025 |
| 65 | Slash commands anywhere | 20 | +5% | YC | $3.3M | Seed$3.3M, May 2021 | |
| 66 | The place where motivated investors and entrepreneurs co-own together. | 42 | +5% | +20% | YC | $20.5M | Series A$15M, Nov 2024 |
| 67 | Easier and more reliable mobile app releases for teams. | 21 | +5% | +24% | YC | $2M | Seed$2M, Jul 2022 |
| 68 | Healthy organic food that creates a positive impact | 21 | +5% | +24% | 0 | ||
| 69 | Leading online after-school for kids & teens to learn AI & coding | 822 | +5% | +18% | 9 | $2M | Undisclosed round$1.2M, Jan 2023 |
| 70 | Amazon-like logistics for e-commerce companies in Latam | 248 | +5% | +3% | 0 | $34M | Series A$1M, Feb 2025 |
| 71 | Redcliffe Labs is India's Largest Omni-channel Diagnostics platform | 2,065 | +5% | +10% | 0 | $152M | Series C$42M, Sep 2024 |
| 72 | The lightest electric aircraft motors in the world. | 57 | +4% | +21% | 0 | $24.6M | Series A$20M, Aug 2024 |
| 73 | Online therapy platform for the Spanish-speaking market | 146 | +4% | +1% | 0 | SeedSep 2022 | |
| 74 | Energy Orchestration Platform | 64 | +3% | +2% | 1 | $17.2M | Series A$15M, Nov 2022 |
| 75 | Marketing automation platform for selling to local businesses. | 33 | +3% | YC | $5M | Seed$5M, Jul 2024 | |
| 76 | GimBooks makes Bookkeeping Easy for small business owners | 68 | +3% | +11% | 0 | $125K | Non-equity support$125K, Jan 2022 |
| 77 | Aviron transforms workouts with game-based exercise machines, making… | 73 | +3% | +4% | 0 | $23.6M | Series A$18.6M, Feb 2022 |
| 78 | Stocks and cryptos trading app with zero commissions and no minimums… | 74 | +3% | +4% | YC | $2M | Seed$2M, Jul 2023 |
| 79 | Stripe for online identity verification | 42 | +2% | +20% | YC | $8.7M | Series A$8.2M, Oct 2024 |
| 80 | A growth automation platform for Amazon sellers | 46 | +2% | +12% | 0 | $7M | Series A$5M, Mar 2023 |
| 81 | AI-powered customer service for startups | 193 | +2% | +9% | 0 | $1.2M | Undisclosed round$125K, Jan 2023 |
| 82 | Canada's digital health clinic for men | 99 | +2% | +5% | 8 | $38.9M | Series A$34.7M, Mar 2025 |
| 83 | Digital bank for teenagers in LatAm connected to prepaid card | 102 | +2% | +3% | 0 | $25.8M | Undisclosed round$10.7M, Apr 2023 |
| 84 | Infrastructure and tools to build and scale blockchain applications. | 110 | +2% | −4% | YC | $102M | Secondary$60M, Jan 2024 |
| 85 | Simplifying hiring and payments for the global workforce | 411 | +1% | +4% | 0 | $34.7M | Series A$9M, Dec 2022 |
| 86 | We underwrite and insure house rentals in Latam | 131 | +1% | −2% | 0 | $10M | Series A$5.6M, Nov 2024 |
| 87 | We help US tech companies hire and manage software engineers in LATAM | 445 | 0% | +9% | 0 | $18M | Series A$5M, Jan 2023 |
| 88 | Challenger Bank for consumers in French speaking Africa. | 327 | 0% | +4% | 0 | $49.1M | Debt$1.5M, Aug 2026 |
| 89 | Physical AI for asset-heavy industries | 888 | 0% | +21% | 4 | $184M | Series C$120M, Dec 2024 |
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
334 companies were in Y Combinator's Winter 2021 batch (W21); 226 are active.
46 companies posted roles in the last 60 days, led by REGENT (30 roles), Shepherd (17 roles) and Codingal (9 roles). 77 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): OpenCode (+200%), Venu AI (+58%) and Vapi (+50%).
Largest latest rounds in the last 12 months, after their YC batch: Stoke Space ($1B), Nourish ($100M) and Ollama ($65M).