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W23 companies that raised the most in the last 12 months

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.

Showing 25 of 25 companies on this list
#CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
1
AI-powered Sales Agent for Service-Based Industries
270+38%+108%6$126MSeries B$125M, Apr 2026
2
The AI-native sales tax solution.
173+25%+63%2$158MSeries C$100M, Sep 2026
3
Medical language models to automate healthcare operations
137+47%+198%24$93.5MSeries A$80M, Mar 2026
4
AI-native Employee Management Platform for High-Growth Companies
87+61%+200%11$85MSeries B$60M, Jun 2026
5
AI for corporate tax
106+49%+74%1$43.5MSeries B$31M, Feb 2026
6
Transforming how health systems optimize labor
74+19%+85%12$31MSeries A$31M, Oct 2026
7
Automating Securities Compliance
82+8%+49%1$24.5MSeries A$22M, Jul 2026
8
AI Agents for Fraud Review and Investigations
20+18%+54%YC$25.1MSeries A$21.5M, Mar 2026
9
Offensive security for the teams that are 100x outnumbered
77+28%+64%YC$23.8MSeries A$17.9M, Mar 2026
10
Build and deploy fully‑managed AI agents and workflows
17+31%+143%6$18.5MSeries A$16M, Dec 2025
11
Agentic automation that understands context, recovers, and improves.
22−12%+10%YC$19.8MSeries A$15.5M, Nov 2025
12
AI Platform for Architects and Engineers
47+4%+47%2$17.1MSeries A$15M, Dec 2025
13
Move money programmatically - built for developers
21+31%+62%0$14MSeries A$13.5M, Jul 2026
14
The AI Agent platform for finance
24+14%+71%YC$17.2MSeries A$12M, Jan 2026
15
the AI social facilitator for offline human to human interactions
203+12%+38%YC$16.2MSeries A$10.1M, Dec 2025
16
Software delivery built for machine scale.
61 +17%0$15.9MSeries A$10M, Mar 2026
17
Create beautiful videos & docs for any product or process in minutes
41+24%+95%3$11.9MSeries A$10M, Oct 2026
18
Advertising for the new internet
93+3%+19%YC$10MSeries A$10M, May 2026
19
Cloud warehousing & supply chain platform in MENA
60+13%+20%YC$10.4MSeries A$9.9M, Sep 2026
20
The AI-native workspace to design your product.
12+20%+71%1$6MSeries A$6M, Nov 2025
21
The operating system for shipping and receiving.
24−8%+33%YC$6.5MSeed$6M, Mar 2026
22
A single API for all your integrations
20+11%+82%8$7.5MSeed$4.5M, Mar 2026
23
Metal is an AI-driven operating system for fundraising
127+43%+189%0$4.5MSeed$4.5M, Jun 2026
24
Fully Agentic SWE
40+8%+33%8$3.5MUndisclosed round$534K, Jan 2026
25
Generative AI for protein design
9−18%−10%YC$500KSeed$500K, Sep 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 W23 companies

How many YC W23 companies are there?

274 companies were in Y Combinator's Winter 2023 batch (W23); 199 are active.

Which YC W23 companies are hiring?

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.

Which YC W23 companies are growing fastest?

By team growth over 6 months (10+ people): LiteLLM (+100%), Haven (+83%) and Warp (+61%).

Which YC W23 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Avoca ($125M), Numeral ($100M) and Latent ($80M).

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