The 25 YC W23 companies whose latest reported round, after their YC batch and in the last 12 months, was the largest.
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 | AI-powered Sales Agent for Service-Based Industries | 270 | +38% | +108% | 6 | $126M | Series B$125M, Apr 2026 |
| 2 | The AI-native sales tax solution. | 173 | +25% | +63% | 2 | $158M | Series C$100M, Sep 2026 |
| 3 | Medical language models to automate healthcare operations | 137 | +47% | +198% | 24 | $93.5M | Series A$80M, Mar 2026 |
| 4 | AI-native Employee Management Platform for High-Growth Companies | 87 | +61% | +200% | 11 | $85M | Series B$60M, Jun 2026 |
| 5 | AI for corporate tax | 106 | +49% | +74% | 1 | $43.5M | Series B$31M, Feb 2026 |
| 6 | Transforming how health systems optimize labor | 74 | +19% | +85% | 12 | $31M | Series A$31M, Oct 2026 |
| 7 | Automating Securities Compliance | 82 | +8% | +49% | 1 | $24.5M | Series A$22M, Jul 2026 |
| 8 | AI Agents for Fraud Review and Investigations | 20 | +18% | +54% | YC | $25.1M | Series A$21.5M, Mar 2026 |
| 9 | Offensive security for the teams that are 100x outnumbered | 77 | +28% | +64% | YC | $23.8M | Series A$17.9M, Mar 2026 |
| 10 | Build and deploy fully‑managed AI agents and workflows | 17 | +31% | +143% | 6 | $18.5M | Series A$16M, Dec 2025 |
| 11 | Agentic automation that understands context, recovers, and improves. | 22 | −12% | +10% | YC | $19.8M | Series A$15.5M, Nov 2025 |
| 12 | AI Platform for Architects and Engineers | 47 | +4% | +47% | 2 | $17.1M | Series A$15M, Dec 2025 |
| 13 | Move money programmatically - built for developers | 21 | +31% | +62% | 0 | $14M | Series A$13.5M, Jul 2026 |
| 14 | The AI Agent platform for finance | 24 | +14% | +71% | YC | $17.2M | Series A$12M, Jan 2026 |
| 15 | the AI social facilitator for offline human to human interactions | 203 | +12% | +38% | YC | $16.2M | Series A$10.1M, Dec 2025 |
| 16 | Software delivery built for machine scale. | 61 | +17% | 0 | $15.9M | Series A$10M, Mar 2026 | |
| 17 | Create beautiful videos & docs for any product or process in minutes | 41 | +24% | +95% | 3 | $11.9M | Series A$10M, Oct 2026 |
| 18 | Advertising for the new internet | 93 | +3% | +19% | YC | $10M | Series A$10M, May 2026 |
| 19 | Cloud warehousing & supply chain platform in MENA | 60 | +13% | +20% | YC | $10.4M | Series A$9.9M, Sep 2026 |
| 20 | The AI-native workspace to design your product. | 12 | +20% | +71% | 1 | $6M | Series A$6M, Nov 2025 |
| 21 | The operating system for shipping and receiving. | 24 | −8% | +33% | YC | $6.5M | Seed$6M, Mar 2026 |
| 22 | A single API for all your integrations | 20 | +11% | +82% | 8 | $7.5M | Seed$4.5M, Mar 2026 |
| 23 | Metal is an AI-driven operating system for fundraising | 127 | +43% | +189% | 0 | $4.5M | Seed$4.5M, Jun 2026 |
| 24 | Fully Agentic SWE | 40 | +8% | +33% | 8 | $3.5M | Undisclosed round$534K, Jan 2026 |
| 25 | Generative AI for protein design | 9 | −18% | −10% | YC | $500K | Seed$500K, Sep 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
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).