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YC W25 companies (Winter 2025)

All 166 companies in Y Combinator's Winter 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
25 roles
AfterQueryW25
  1. 2Harper14
  2. 3SalesPatriot3
See all 15
Fastest growingteam, 6 months
+300%
Mundo AIW25
  1. 2Mosaic+117%
  2. 3Spott+96%
See all 43
Shrinkingteam, 12 months
−15%
G LNKW25
  1. 2Butter−4%
Raised the mostlast 12 months
$47M
HarperW25
  1. 2AfterQuery$30M
  2. 3Solidroad$25M
See all 19
Companies
166
Active
159
Hiring, last 60 days
15
Open roles, 60 days
59
People on these teams
1,860
Showing 50 of 166 companies
CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
Applied research lab curating data solutions for foundation model…
286+58%+186%25$30.5MSeries B$30M, Sep 2026
AI-native commercial insurance brokerage
85+35%+158%14$47.5MSeries A$47M, Feb 2026
AI hiring platform powered by expert recruiters
62+13%+130%0$2.8MSeed$2.3M, May 2026
The Javascript framework for building AI agents, from the Gatsby devs
62+19%+44%0$35MSeries A$22M, Apr 2026
AI-native ATS/CRM for recruiting firms
47+96%+327%2$24.2MSeries A$21M, Sep 2026
The data layer for perceptual intelligence
44+300%+450%2$24MSeries A$20M, Aug 2026
AI agents for CX teams, starting with training and QA.
43+48%+187%2$32.7MSeries A$25M, Apr 2026
Agents for Accelerated Clinical Trial Design
32+7%+19%0$500KYC investment$500K, May 2025
Supply chain superintelligence for distribution and procurement
26+18%+37%3$5.5MSeed$5M, Oct 2025
High Thrust Space Vehicles for Satellite Defense
26+53%+117%1$8.8MSeed$8.8M, Aug 2025
AI to understand and then route engineering work
25+32%+127%2$18.2MSeries A$13.5M, Jul 2026
AI quote & order processing for technical distributors & manufacturers
24+14%+4%YC$2.6MSeed$2.1M, Dec 2025
AI systems for aviation
22+10%+29%0$500KYC investment$500K, Mar 2025
Query mission-critical video
22+29%+69%0$14.4MSeed$7M, Mar 2026
Foundational model of human societies for consequential decisions
22+69%+120%0$5.1MSeed$3.3M, Aug 2025
Embedded Sandboxes for Agents
22−4%−4%0$500KYC investment$500K, Mar 2025
AI-driven exam prep
21+5% 0$5.2MSeed$4.7M, May 2025
Be the Answer in AI Search - AI SEO across SEO, GEO & AEO
20+11%+18%YC$2.7MSeed$2.2M, Mar 2025
Global B2B Stablecoin Processor
20+18%+43%2
The social network layer for AI apps
18 +260%0$500KYC investment$500K, Mar 2025
Agents that use the browser.
18−25%−5%YC$17.5MSeed$17M, Mar 2025
The OS for hospital workforce management
17+70%+240%YC$500KYC investment$500K, Mar 2025
AI Teacher Assistant for Grading Essays
17+13% YC$600KSeed$600K, Jan 2025
Simplifying Collaboration for Healthcare Organizations & Professionals
17−26%−15%0$500KYC investment$500K, Mar 2025
Software Enabled CNC Parts Supplier
17+6%+113%YC$500KYC investment$500K, Mar 2025
Making humanoids dexterous enough to thread a needle
17+42%+31%YC$11MSeed$11M, Jun 2026
AI voice and texting agents
16+7%+60%1$5.2MSeed$4.7M, Mar 2025
AI-powered student information system for K-12 schools
16+33%+100%YC$500KYC investment$500K, Mar 2025
AI compliance co-pilot for regulated financial businesses
16+60% 0SeedMar 2025
AI Accountant for Accounting Firms
16+45%+129%YC$1.5MSeed$1M, Mar 2026
Platform and marketplace for RL environments and AI data
16+7%+23%YC$16.2MSeries A$14M, Jun 2026
Building the open source smart glasses operating system.
16−16%−16%0$8MSeed$8M, Mar 2025
AI Powered CAD
15+7%+50%YC$4.6MSeed$4.1M, Oct 2025
AI Copilot that automates admin work for veterinary professionals
14−18%−12%0$1.6MYC investment$500K, Jan 2025
awen translates intent into exceptional visuals through conversation
14+17%+75%0$500KYC investment$500K, Mar 2025
We help law enforcement solve crime
13+18%+160%YC$7MSeed$7M, Mar 2025
Frontier Video Agents
13+117%+117%YC$500KYC investment$500K, Mar 2025
The personal AI agent network for Asia
13−13%−24%0$4.4MSeed$4.4M, Jun 2025
Pending CFTC regulation to be the first cash and physically settled…
13  YC$15MSeed$15M, Sep 2026
Agent with a computer
12−37%+33%0$500KYC investment$500K, Mar 2025
AI for insurance verification & billing at dental clinics
12+9% YCSeedMar 2025
AI-powered Patient Identification for Clinical Trials
12+20%+33%YC$500KYC investment$500K, Jan 2026
Agentic Sales Platform
12+20%+50%YC$500KYC investment$500K, Mar 2025
Stablecoin API for global payments
12+9%+20%0$3.8MSeed$3.3M, Aug 2025
Production Monitoring & Evals for AI Agents
11+10%+38%YC$2.2MSeed$2.2M, Mar 2025
Ergo is the context layer that helps revenue teams close more deals.
11+57%+83%YC$3.3MSeed$2.8M, Jun 2026
AI estimating & detailing for Division 8 doors, frames & hardware
10+25%+67%1$3.6MSeed$3.1M, Jul 2025
AI tutor starting with maths and science
10+25%−9%0$500KYC investment$500K, Jan 2026
Autonomous patrol-boats for National Security
10+25%+43%YC$4.7MSeed$4.2M, Jul 2026
Manufacturing the most powerful chips, 15x faster
10+25%+25%0$500KYC investment$500K, Jan 2026

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 W25 companies

How many YC W25 companies are there?

166 companies were in Y Combinator's Winter 2025 batch (W25); 159 are active.

Which YC W25 companies are hiring?

15 companies posted roles in the last 60 days, led by AfterQuery (25 roles), Harper (14 roles) and SalesPatriot (3 roles). 66 mark themselves as hiring on YC's directory.

Which YC W25 companies are growing fastest?

By team growth over 6 months (10+ people): Mundo AI (+300%), Mosaic (+117%) and Spott (+96%).

Which YC W25 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Harper ($47M), AfterQuery ($30M) and Solidroad ($25M).

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