The 73 YC W23 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 | Call every LLM API like it's OpenAI [100+ LLMs] | 26 | +100% | +333% | 1 | ||
| 2 | AI workforce for property management | 11 | +83% | +120% | YC | $500K | YC investment$500K, Apr 2023 |
| 3 | AI-native Employee Management Platform for High-Growth Companies | 87 | +61% | +200% | 11 | $85M | Series B$60M, Jun 2026 |
| 4 | Security infrastructure for developers and agents | 49 | +58% | +133% | 11 | $18.9M | Series A$16M, Jun 2025 |
| 5 | Pierre is a new, opinionated, git platform. | 23 | +53% | +77% | 0 | SeedJan 2025 | |
| 6 | Enabling birth & postpartum doulas to easily accept insurance. | 21 | +50% | +75% | 0 | SeedJan 2026 | |
| 7 | A new kind of creative company. | 12 | +50% | +71% | YC | $500K | YC investment$500K, May 2023 |
| 8 | Empowering every doctor and every patient to participate in research | 12 | +50% | +50% | 0 | $1M | Seed$1M, Apr 2023 |
| 9 | AI for corporate tax | 106 | +49% | +74% | 1 | $43.5M | Series B$31M, Feb 2026 |
| 10 | Medical language models to automate healthcare operations | 137 | +47% | +198% | 24 | $93.5M | Series A$80M, Mar 2026 |
| 11 | Automating Healthcare Revenue Cycle Management with AI Workforce | 19 | +46% | +27% | 0 | SeedJan 2026 | |
| 12 | Magically simplify accounting and taxes | 13 | +44% | +63% | YC | $2.1M | Seed$2M, Apr 2023 |
| 13 | Adventris makes cancer vaccines | 10 | +43% | +25% | 0 | $500K | YC investment$500K, Jan 2024 |
| 14 | Metal is an AI-driven operating system for fundraising | 127 | +43% | +189% | 0 | $4.5M | Seed$4.5M, Jun 2026 |
| 15 | Restaurant software that actually works | 37 | +42% | +118% | YC | $500K | YC investment$500K, Sep 2024 |
| 16 | Production-ready document processing | 37 | +42% | +131% | 0 | $17.5M | Series A$17M, Jun 2025 |
| 17 | AI-powered Sales Agent for Service-Based Industries | 270 | +38% | +108% | 6 | $126M | Series B$125M, Apr 2026 |
| 18 | Move money programmatically - built for developers | 21 | +31% | +62% | 0 | $14M | Series A$13.5M, Jul 2026 |
| 19 | Build and deploy fully‑managed AI agents and workflows | 17 | +31% | +143% | 6 | $18.5M | Series A$16M, Dec 2025 |
| 20 | Billing and project management for utility construction | 13 | +30% | +30% | YC | $2.7M | Seed$2.2M, Apr 2023 |
| 21 | Automation platform for logistics | 44 | +29% | +38% | YC | $18.3M | Series A$14.2M, Dec 2024 |
| 22 | We help global software companies comply with local tax reporting | 22 | +29% | +100% | YC | $2.4M | Seed$1.7M, Apr 2023 |
| 23 | Offensive security for the teams that are 100x outnumbered | 77 | +28% | +64% | YC | $23.8M | Series A$17.9M, Mar 2026 |
| 24 | The AI-native sales tax solution. | 173 | +25% | +63% | 2 | $158M | Series C$100M, Sep 2026 |
| 25 | 20 | +25% | +33% | 0 | SeedJan 2025 | ||
| 26 | Ai-native finance platform for the Middle East | 367 | +25% | +79% | 3 | $55M | Series A$48M, Aug 2025 |
| 27 | Create beautiful videos & docs for any product or process in minutes | 41 | +24% | +95% | 3 | $11.9M | Series A$10M, Oct 2026 |
| 28 | The operating system for the car wash industry. | 11 | +22% | +57% | 0 | $500K | YC investment$500K, Apr 2023 |
| 29 | Automating root cause analysis with generative AI | 11 | +22% | +57% | 0 | $7.5M | Seed$7M, Oct 2025 |
| 30 | Infrastructure for indirect revenue channels | 180 | +22% | +58% | 14 | $18.5M | Series A$15M, Feb 2025 |
| 31 | Phone AI that Captures Every Dealership Revenue Opportunity | 18 | +20% | +100% | YC | $2.7M | Seed$2.7M, Jul 2023 |
| 32 | The AI-native workspace to design your product. | 12 | +20% | +71% | 1 | $6M | Series A$6M, Nov 2025 |
| 33 | Transforming how health systems optimize labor | 74 | +19% | +85% | 12 | $31M | Series A$31M, Oct 2026 |
| 34 | Neobank for global remote workers | 38 | +19% | +31% | 0 | $1.6M | Grant$60K, Jun 2024 |
| 35 | AI Agents for Fraud Review and Investigations | 20 | +18% | +54% | YC | $25.1M | Series A$21.5M, Mar 2026 |
| 36 | The leading AI workforce for the trades. | 61 | +17% | +56% | 1 | $500K | YC investment$500K, Apr 2023 |
| 37 | Fast, Transparent Patient Experiences | 342 | +16% | +56% | 19 | $161M | Series C$101M, Jun 2025 |
| 38 | AI Servicing for Auto Lenders | 67 | +16% | +86% | 9 | $60.5M | Series A$60M, Jul 2025 |
| 39 | Plaid for Commercial Real Estate | 15 | +15% | +36% | 0 | $3.3M | Seed$3.3M, Oct 2023 |
| 40 | The Agentic Support Platform purpose-built for B2B. | 183 | +15% | +81% | 3 | $51.3M | Series B$31M, Aug 2025 |
| 41 | Dollar banking for people in Latin America | 69 | +15% | +50% | 0 | $4.5M | YC investment$500K, Apr 2023 |
| 42 | The AI Agent platform for finance | 24 | +14% | +71% | YC | $17.2M | Series A$12M, Jan 2026 |
| 43 | Plaid for supply chain logistics | 24 | +14% | +14% | 0 | $3.1M | Seed$2.6M, Nov 2023 |
| 44 | All-in-One Software for the $1T Grocery Industry | 24 | +14% | +41% | YC | SeedJan 2024 | |
| 45 | Building the first multimodal agents to play and test games. | 25 | +14% | +25% | 0 | $8M | Seed$6M, Mar 2025 |
| 46 | Cloud warehousing & supply chain platform in MENA | 60 | +13% | +20% | YC | $10.4M | Series A$9.9M, Sep 2026 |
| 47 | Hire the best AI Sales employees | AI SDR | AI RevOps | AI EA | 57 | +12% | +159% | 1 | $1.4M | Seed$800K, Jul 2023 |
| 48 | the AI social facilitator for offline human to human interactions | 203 | +12% | +38% | YC | $16.2M | Series A$10.1M, Dec 2025 |
| 49 | A single API for all your integrations | 20 | +11% | +82% | 8 | $7.5M | Seed$4.5M, Mar 2026 |
| 50 | AI for Government Contractors | 20 | +11% | +33% | 2 | $2.5M | Seed$2.5M, Mar 2025 |
| 51 | Models and infra for coding agents | 10 | +11% | +25% | 2 | $23M | Series A$23M, Oct 2025 |
| 52 | Design and explain complex software architecture. | 10 | +11% | +25% | YC | $500K | YC investment$500K, Apr 2023 |
| 53 | Less screen time, more life. | 10 | +11% | +100% | 0 | $1M | Seed$500K, Oct 2025 |
| 54 | Automate data-driven slide decks and documents with AI | 31 | +11% | +3% | YC | $12.9M | Series A$11M, Oct 2024 |
| 55 | Dill helps construction suppliers automate accounts receivable,… | 21 | +11% | +17% | 1 | SeedApr 2023 | |
| 56 | We teach your immune system to attack and cure cancer | 11 | +10% | +22% | 0 | $500K | YC investment$500K, Apr 2023 |
| 57 | Build the software you wish existed. | 60 | +9% | +25% | 1 | $5.5M | Seed$5M, Aug 2023 |
| 58 | AI-native storytelling studio. | 25 | +9% | +39% | YC | $500K | YC investment$500K, Apr 2023 |
| 59 | Fully Agentic SWE | 40 | +8% | +33% | 8 | $3.5M | Undisclosed round$534K, Jan 2026 |
| 60 | Automating Securities Compliance | 82 | +8% | +49% | 1 | $24.5M | Series A$22M, Jul 2026 |
| 61 | Email for developers | 79 | +7% | +46% | 5 | $21.5M | Series A$18M, Dec 2024 |
| 62 | AI & financial services for real estate in LatAm, starting by rent | 17 | +6% | +31% | 0 | $1.6M | Seed$1.1M, Sep 2025 |
| 63 | B2B Marketplace for Steel Raw Materials | 17 | +6% | +6% | 0 | $1.4M | Series A$1.4M, Apr 2023 |
| 64 | Managed marketplace for solar in Latam | 59 | +5% | +31% | 0 | $500K | YC investment$500K, Apr 2023 |
| 65 | Frictionless payments via SMS | 21 | +5% | −28% | 0 | $5M | Seed$4.5M, Jul 2025 |
| 66 | AI-powered document automation: collect, review, extract, and sync. | 23 | +5% | +28% | 0 | $3.6M | Seed$3.5M, Apr 2023 |
| 67 | AI Platform for Architects and Engineers | 47 | +4% | +47% | 2 | $17.1M | Series A$15M, Dec 2025 |
| 68 | Advertising for the new internet | 93 | +3% | +19% | YC | $10M | Series A$10M, May 2026 |
| 69 | AI Wealth Manager | 34 | +3% | +26% | YC | $2.7M | Seed$2.6M, May 2023 |
| 70 | AI-powered care for seniors with chronic disease | 35 | +3% | +40% | 6 | $500K | YC investment$500K, Mar 2023 |
| 71 | Train AI on distributed data | 83 | +2% | +1% | 0 | $23.6M | Series A$20M, Feb 2024 |
| 72 | The Finance Control Centre for African Businesses | 43 | +2% | +16% | 0 | $2.5M | Seed$2M, Dec 2023 |
| 73 | Empowering Autism Care Providers to Go Independent | 131 | +2% | +6% | 83 | $3.3M | Series A$3.2M, Mar 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
274 companies were in Y Combinator's Winter 2023 batch (W23); 199 are active.
33 companies posted roles in the last 60 days, led by Finni Health (83 roles), Latent (24 roles) and Tennr (19 roles). 79 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): LiteLLM (+100%), Haven (+83%) and Warp (+61%).
Largest latest rounds in the last 12 months, after their YC batch: Avoca ($125M), Numeral ($100M) and Latent ($80M).