The 31 YC W18 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 | Vena Medical is providing physicians with the world's smallest camera… | 26 | +30% | −7% | 0 | $198K | YC investment$40K, Feb 2018 |
| 2 | ZBiotics makes genetically engineered probiotics. | 71 | +16% | +25% | 6 | $17.2M | Secondary$12M, Mar 2025 |
| 3 | Automating payroll for Latin America. | 210 | +12% | +17% | YC | Series ASep 2021 | |
| 4 | 'Figma/Canva for scientists’ | 266 | +11% | +20% | 9 | $17M | Series A$15.3M, Apr 2023 |
| 5 | Health insurance for remote teams | 184 | +10% | +27% | YC | $47.1M | Series B$35M, Apr 2022 |
| 6 | Flat-fee patent & trademark counsel with top firm results | 11 | +10% | +10% | 0 | $2.8M | Seed$2.8M, Jul 2019 |
| 7 | Helloverify is a background screening platform (Checkr for India). | 641 | +9% | +12% | YC | $120K | Series A$120K, Mar 2019 |
| 8 | 96 | +9% | +20% | 1 | $18.1M | Series A$15M, Nov 2018 | |
| 9 | Sourcify helps brands manufacture products in Asia. | 13 | +8% | +30% | YC | $4.9M | Convertible note$2.5M, Mar 2018 |
| 10 | Tax filing automation for individuals in Latam. | 85 | +8% | +29% | 0 | $120K | Seed$120K, Apr 2021 |
| 11 | All-in-one Finance OS for businesses | 1,183 | +7% | +10% | 6 | $300M | Series C$100M, Feb 2023 |
| 12 | Analytics to improve how teams work and collaborate | 15 | +7% | +7% | 0 | SeedJan 2018 | |
| 13 | Making Anime Real | 33 | +6% | +18% | 1 | $120K | Seed$120K, Aug 2018 |
| 14 | Vanta, the proven leader in automated compliance helping startups… | 1,993 | +6% | +34% | 9 | $503M | Series D$150M, Jul 2025 |
| 15 | Contact center AI platform. | 358 | +6% | −15% | 3 | $214M | Series C$125M, Apr 2022 |
| 16 | Anjuna enabled organizations to trust any infrastructure | 35 | +6% | +13% | 0 | $67.1M | Series B$25M, Aug 2024 |
| 17 | Agile commission software to design, deploy & adapt commission plans. | 284 | +6% | +12% | 2 | $165M | Series C$100M, Jan 2022 |
| 18 | The self-maintaining knowledge base | 42 | +5% | +11% | 0 | $15.4M | Series A$11M, Apr 2020 |
| 19 | Create remarkable client experiences | 44 | +5% | +13% | 1 | $10M | Series A$10M, Jan 2023 |
| 20 | Replacing orthodontic braces with our clear aligner and software | 22 | +5% | YC | $8M | Undisclosed round$7.8M, Feb 2020 | |
| 21 | 24/7 pediatric clinic in every family's living room | 83 | +4% | +9% | 3 | $7.7M | Seed$4M, Jan 2022 |
| 22 | Bookkeeping, tax, & tax credits on autopilot for 2,000+ startups | 117 | +4% | +13% | YC | $10M | Seed$7M, Nov 2024 |
| 23 | Swayable predicts consumer opinion and the impact of content | 64 | +3% | +25% | 9 | SeedMay 2019 | |
| 24 | Making financial services simple, transparent and delightful. | 3,191 | +3% | +13% | 6 | $1.3B | Post-IPO secondary$183M, Sep 2026 |
| 25 | The world's first digital clinic for substance use management | 176 | +3% | +5% | 1 | $152M | Series C$58M, Mar 2024 |
| 26 | Order ahead at restaurants and get rewards with friends. | 78 | +3% | −8% | 0 | $95.6M | Series B$70M, Jun 2021 |
| 27 | Shogun empowers brands to create exceptional ecommerce experience. | 241 | +3% | +6% | 0 | $115M | Series C$67.5M, Jun 2021 |
| 28 | Better payment systems for governments and the communities they serve. | 252 | +2% | +8% | 1 | $48.1M | Series B$25M, Feb 2022 |
| 29 | Super is the first and leading Indonesian social commerce platform | 223 | +2% | −12% | 0 | $105M | Series C$70M, Jun 2022 |
| 30 | Embedded banking software platform and marketplace | 56 | +2% | +2% | 1 | $71.5M | Series C$40M, Sep 2022 |
| 31 | A mental health benefits platform for employers. | 920 | +2% | −1% | 5 | $167M | Series D$74M, Feb 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
146 companies were in Y Combinator's Winter 2018 batch (W18); 77 are active.
24 companies posted roles in the last 60 days, led by Replit (10 roles), Swayable (9 roles) and BioRender (9 roles). 25 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Vena Medical (+30%), ZBiotics (+16%) and Runa (+12%).
Largest latest rounds in the last 12 months, after their YC batch: Replit ($400M), Culture Biosciences ($80M) and Jasper.ai ($400K).