The 27 YC S25 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 that makes AI fast | 18 | +200% | 2 | $44.8M | Series A$40M, Sep 2026 | |
| 2 | Data and RL environments to automate knowledge work | 55 | 2 | $30.5M | Series A$30M, Oct 2026 | ||
| 3 | Making AI run fast on any hardware. | 13 | +18% | +44% | YC | $35M | Undisclosed round$29.2M, Oct 2026 |
| 4 | We Bring Customers to Your Dealership | 35 | +94% | +289% | 15 | $33.5M | Series A$27M, Oct 2026 |
| 5 | Supplying America's Industrial Base | 35 | +218% | +600% | YC | $16.8M | Seed$11.5M, Jun 2026 |
| 6 | Hill-climb any benchmark, for any model, in any domain. | 16 | +7% | +129% | 2 | $9.5M | Seed$9M, Aug 2026 |
| 7 | RNA intelligence for precision medicine | 8 | 0 | $7.3M | Seed$7.2M, May 2026 | ||
| 8 | Cloud infrastructure for MCP servers and Claude / ChatGPT plugins. | 5 | YC | $6.8M | Seed$6.3M, Feb 2026 | ||
| 9 | Email Inboxes for AI Agents | 13 | +30% | 3 | $6.5M | Seed$6M, Mar 2026 | |
| 10 | Database of every product on the internet | 9 | +50% | YC | $6.5M | Seed$6M, Dec 2025 | |
| 11 | Building the new superintelligence for insurance | 14 | 0% | +40% | YC | $6M | Seed$6M, Aug 2026 |
| 12 | Agentic sales enrichment spreadsheet | 9 | −31% | −25% | YC | $5.8M | Seed$5.3M, Feb 2026 |
| 13 | AI Tax Preparer for CPA firms | 9 | +29% | YC | $5.7M | Seed$5.2M, Jun 2026 | |
| 14 | Your personal investing agent | 7 | −12% | +17% | 0 | $5.5M | Seed$5M, Apr 2026 |
| 15 | The AI platform for private markets investors | 38 | +90% | +81% | 6 | $29M | Seed$5M, Sep 2026 |
| 16 | The Global Dollar App for Brazil | 31 | +24% | +63% | 0 | $5.1M | Seed$4.6M, Feb 2026 |
| 17 | AI agents that automate administrative work across college campuses. | 9 | +50% | +29% | 0 | $4.1M | Seed$3.6M, May 2026 |
| 18 | AI Agents for E-commerce Customer Support | 8 | +60% | 0 | $4.1M | Seed$3.6M, Mar 2026 | |
| 19 | The open-source platform that continuously improves your ai agents | 7 | YC | $3.5M | Seed$3.5M, Jun 2026 | ||
| 20 | Your personal AI Assistant | 14 | −7% | −7% | 2 | $5.2M | Seed$3.5M, Aug 2026 |
| 21 | Foundational Voice Models for regional languages | 6 | 0% | −14% | YC | $4M | Seed$3.5M, Jan 2026 |
| 22 | AI accounting for enterprise finance teams | 13 | +63% | 1 | $3.4M | Seed$3.4M, Jul 2026 | |
| 23 | AI Native Rippling for Deskless Workers | 10 | +67% | YC | $3.9M | Seed$3.4M, Nov 2025 | |
| 24 | Context-aware orchestration between humans and AI. | 5 | 0% | 0 | $3.5M | Seed$3M, Feb 2026 | |
| 25 | Production infrastructure on autopilot | 6 | +20% | 0 | $3.5M | Seed$3M, Jan 2026 | |
| 26 | AI agents for E2E testing across mobile & web | 8 | +60% | 0 | $3.2M | Seed$2.7M, Feb 2026 | |
| 27 | Deep research for class action law firms | 3 | YC | $1.2M | Seed$692K, Apr 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
165 companies were in Y Combinator's Summer 2025 batch (S25); 158 are active.
14 companies posted roles in the last 60 days, led by Flai (15 roles), F2 (6 roles) and Comena (5 roles). 69 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Freya (+355%), Nox Metals (+218%) and Wafer (+200%).
Largest latest rounds in the last 12 months, after their YC batch: Wafer ($40M), Halluminate ($30M) and Luminal ($29.2M).