The 19 YC X25 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 | quantum-accelerated AI servers | 48 | +50% | +118% | 8 | $139M | Series A$105M, Mar 2026 |
| 2 | Autonomous Company Infrastructure | 15 | +150% | +200% | 3 | $28.5M | Series A$28.5M, Aug 2026 |
| 3 | We supply hard tech companies with critical components. | 6 | +20% | YC | $25M | Seed$25M, Jul 2026 | |
| 4 | The agentic operating system for modern system integrators. | 48 | +37% | +167% | 3 | $20.5M | Series A$20M, Apr 2026 |
| 5 | Function Health for Europe | 44 | +26% | +100% | 3 | $28.5M | Series A$20M, May 2026 |
| 6 | Autonomous security testing for web apps, APIs, cloud, and AI systems | 21 | +75% | +200% | YC | $17.2M | Series A$13M, Jul 2026 |
| 7 | Secure internal apps. Built by AI in seconds. Powered by your data. | 14 | +27% | +56% | 0 | $10.5M | Seed$10M, Dec 2025 |
| 8 | 24/7 Global Stock Exchange | 12 | +50% | +50% | YC | $10M | Seed$9.5M, Mar 2026 |
| 9 | Industrial data layer for physical RSI | 56 | +331% | 0 | $7.6M | Seed$6M, Jun 2026 | |
| 10 | Software to monitor, control, and optimize data centers. | 13 | +30% | +63% | YC | $5.1M | Seed$5.1M, Dec 2025 |
| 11 | Design a chip in minutes | 7 | YC | $5M | Seed$5M, Apr 2026 | ||
| 12 | Agentic AI platform for Pharma GTM teams | 39 | +63% | +144% | YC | $5M | Seed$5M, Nov 2025 |
| 13 | AI Revenue Platform for Post-Acute Care | 13 | +63% | +160% | 3 | $4.9M | Seed$4.4M, Jan 2026 |
| 14 | Play the latest games in your browser with no downloads | 9 | +29% | 0 | $4.3M | Seed$3.8M, Dec 2025 | |
| 15 | Voice data for AI | 18 | +13% | +260% | YC | $3.5M | Seed$3M, Nov 2025 |
| 16 | Agent-native GitHub Actions runners | 3 | 0 | $3.5M | Pre-seed$3M, Sep 2026 | ||
| 17 | AI-Native Mortgage Broker | 6 | −25% | −14% | YC | $2.9M | Seed$2.9M, Jun 2026 |
| 18 | The AI Associate for Litigation Lawyers | 33 | −3% | −11% | 0 | $3M | Seed$2.5M, May 2026 |
| 19 | Product Native Models | 4 | −20% | −33% | 0 | $2.5M | Seed$2M, Nov 2025 |
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
144 companies were in Y Combinator's Spring 2025 batch (X25); 136 are active.
11 companies posted roles in the last 60 days, led by Sygaldry Technologies (8 roles), Sim (4 roles) and Lucis (3 roles). 57 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Linewise (+331%), Naïve (+150%) and Sixtyfour (+117%).
Largest latest rounds in the last 12 months, after their YC batch: Sygaldry Technologies ($105M), Naïve ($28.5M) and Foundation Industries ($25M).