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YC X25 companies (Spring 2025)

All 144 companies in Y Combinator's Spring 2025 batch, with team size, growth, open roles and funding.

Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.

Hiring the mostlast 60 days
8 roles
Sygaldry TechnologiesX25
  1. 2Sim4
  2. 3Lucis3
See all 11
Fastest growingteam, 6 months
+331%
LinewiseX25
  1. 2Naïve+150%
  2. 3Sixtyfour+117%
See all 31
Shrinkingteam, 12 months
−32%
HemutX25
  1. 2Crimson−11%
Raised the mostlast 12 months
$105M
Sygaldry TechnologiesX25
  1. 2Naïve$28.5M
  2. 3Foundation Industries$25M
See all 19
Companies
144
Active
136
Hiring, last 60 days
11
Open roles, 60 days
32
People on these teams
1,394
Showing 50 of 144 companies
CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
Vertical AI agents running B2B outbound on autopilot, with human SDRs
140+77%+724%0$6.2MSeed$6.2M, Sep 2025
Industrial data layer for physical RSI
56+331% 0$7.6MSeed$6M, Jun 2026
Build autonomous AI agents for enterprise systems
50+92%+355%4
The agentic operating system for modern system integrators.
48+37%+167%3$20.5MSeries A$20M, Apr 2026
quantum-accelerated AI servers
48+50%+118%8$139MSeries A$105M, Mar 2026
Function Health for Europe
44+26%+100%3$28.5MSeries A$20M, May 2026
Agentic AI platform for Pharma GTM teams
39+63%+144%YC$5MSeed$5M, Nov 2025
The AI Associate for Litigation Lawyers
33−3%−11%0$3MSeed$2.5M, May 2026
AI-powered operating system for trucking companies.
30−55%−32%YCSeedJun 2025
Say it and it's done. Voice is the new OS
21  YC$500KYC investment$500K, Jun 2025
Autonomous security testing for web apps, APIs, cloud, and AI systems
21+75%+200%YC$17.2MSeries A$13M, Jul 2026
The voice interface replacing your keyboard
18−5%+13%YC$4.2MSeed$4.2M, Jul 2025
AI Driven EPC - Weld Fabrication Contractor
18+29%+157%1SeedJun 2025
Voice data for AI
18+13%+260%YC$3.5MSeed$3M, Nov 2025
AI-Native IP Enforcement
18+38%+100%YC$500KYC investment$500K, Mar 2025
Real-time AI Compliance & Revenue Integrity for Medical Providers
18−10%+64%YC$1.8MNon-equity support$1.8M, Jul 2026
Modernizing the police workflow.
17−26%+31%YC$2.7MSeed$2.7M, Jun 2025
Test, monitor, and improve your voice and chat AI agents
16+33%+129%YC$4MSeed$4M, Aug 2025
AI agents for insurance claims operations
15  3$4.6MSeed$4.6M, Nov 2025
Autonomous Company Infrastructure
15+150%+200%3$28.5MSeries A$28.5M, Aug 2026
Secure internal apps. Built by AI in seconds. Powered by your data.
14+27%+56%0$10.5MSeed$10M, Dec 2025
Vertical AI for highly-regulated manufacturing
14+8%+56%1$500KYC investment$500K, Sep 2025
AI-optimized ticket resale
14 +75%0$6MSeed$6M, Jul 2025
Specialized AI for Every Job
14+40% 0Undisclosed roundJan 2026
Software to monitor, control, and optimize data centers.
13+30%+63%YC$5.1MSeed$5.1M, Dec 2025
AI Revenue Platform for Post-Acute Care
13+63%+160%3$4.9MSeed$4.4M, Jan 2026
Industrial Robots that Learn and Operate Like Humans
13+8%+8%YC$500KYC investment$500K, Jun 2025
Intelligence Infrastructure on People and Entities
13+117%+160%YC$500KYC investment$500K, Apr 2025
Automate anything on the web.
13 +18%YC$500KYC investment$500K, Jun 2025
The Agent-Native Computer
13+86%+117%YC
The AI Operator for Financial Services
13+8%−7%2$9.4MNon-equity support$1M, Oct 2025
All-In-One AI Growth Partner. Built for Trades.
13+44%+44%0$7.5MSeed$7M, Nov 2025
The infrastructure for autonomous agents
12+20%+50%0$7.3MSeed$7.3M, Jul 2025
24/7 Global Stock Exchange
12+50%+50%YC$10MSeed$9.5M, Mar 2026
Open-source agents to build predictive ML models from a prompt
11+57%+57%YC$2.1MSeed$2.1M, Aug 2025
AI-powered robotics for scientific lab automation.
11 +22%0SeedJun 2025
Streamlining Data Capture to Report Creation for Heavy Industries
11+57%+83%0$500KYC investment$500K, Jun 2025
Your AI Chief of Staff
11+38%+83%YCSeedJul 2025
The agentic CRM for blue-collar services
11+22%+22%0Pre-seedJun 2025
AI native financial institution
10+11%+11%0SeedApr 2025
A personal EA in your iMessage
10+100%+43%1$2MSeed$2M, Jun 2025
We build software factories for engineering teams
10+25%+11%YCSeedJun 2025
Infrastructure to power every customer interaction.
100%+25%YC$500KYC investment$500K, Jun 2025
AI Physics Engine to replace simulations and prototypes
10  YCSeedJun 2025
Give every agent a cloud desktop
9−10%−18%YC$500KYC investment$500K, Jan 2026
AI tutor for each student.
9−18%−25%0SeedMay 2025
Encrypted AI with verifiable privacy
9+80%+80%0$7.8MSeed$7.1M, Jul 2025
AI Coworker for Accountants
9+50%+80%0SeedJun 2025
Software tool for designing robots and machines
9 +50%YC$530KGrant$30K, Apr 2026
Security operations optimized for agents.
9+80% YC$500KYC investment$500K, Jun 2025

How this works

1. The roster

Every launched company in YC's public directory, with its batch, status, industry and location. New companies show up the week YC lists them.

2. The numbers

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.

3. The lists

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.

Built with Crustdata. Get your own API key and build your own.

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.

  • Company search for team size, growth and funding
  • Job search with a count by company, for who is hiring and for what
  • A watch that re-runs the search weekly and sends only what changed
# 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

Questions about YC X25 companies

How many YC X25 companies are there?

144 companies were in Y Combinator's Spring 2025 batch (X25); 136 are active.

Which YC X25 companies are hiring?

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.

Which YC X25 companies are growing fastest?

By team growth over 6 months (10+ people): Linewise (+331%), Naïve (+150%) and Sixtyfour (+117%).

Which YC X25 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Sygaldry Technologies ($105M), Naïve ($28.5M) and Foundation Industries ($25M).

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