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S23 companies that raised the most in the last 12 months

The 31 YC S23 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 31 of 31 companies on this list
#CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
1
Intelligence that runs your operations.
260+83%+192%36$211MSeries C$150M, Aug 2026
2
Building and Protecting an Exciting Future
62  0$80MSeries A$80M, Jul 2026
3
AI-native operations for the banks
107+16%+47%1$95.3MSeries B$75M, Feb 2026
4
The enterprise platform for AI phone calls
123+4%+38%5$106MSeries C$50M, Jun 2026
5
AI patent drafting, prosecution, litigation and more for legal teams.
72+33%+125%3$55MSeries B$40M, Dec 2025
6
End-to-end content, learning, & deal intelligence for B2B sales teams
68+45%+183%YC$55MSeries B$40M, Feb 2026
7
AI Phone Agents for Healthcare Operations
70+100%+400%4$35MSeries A$30M, Jun 2026
8
The World's First Multi-Agent System for Procurement
149+22%+192%6$30MSeries A$30M, Mar 2026
9
AI-powered user interviews
113+43%+232%25$51.3MSeries B$30M, Dec 2025
10
The operating system for inbound B2B revenue
63−41%−35%YC$29.2MUndisclosed round$26M, Apr 2026
11
Fast Models Optimized for Coding Agents
3  YC$22.5MSeed$22M, May 2026
12
Plaid for Telematics Data in Commercial Trucking
74+28%+90%1$23.1MSeries A$20M, Jul 2026
13
Software that streams data from databases to warehouses in real-time
23+21%+92%2$18.9MSeries A$15.1M, Jan 2026
14
Autonomous surgical robots
19+90%+73%5$15.6MSeries A$15M, Aug 2026
15
All-in-one POS for liquor stores
198+26%+37%YC$22.6MSeries A$15M, Oct 2026
16
Automating Compliance for Construction
62+51%+148%YC$21.8MSeries A$15M, Jul 2026
17
Unmanned airships for inspecting our critical assets
37+37%+42%1$19MSeries A$14.6M, Oct 2026
18
Headcount & Compensation Management
28−3%+4%0$18.3MSeed$13.5M, Oct 2026
19
AI Customer Service Agents for trades and field services
39+50%+117%1$16.4MSeries A$12.9M, Jan 2026
20
AI Powered All-In-One Payroll, HR + Recruiting
22+22%+57%YC$17.1MSeries A$12M, Apr 2026
21
AI Compliance Platform for Healthcare Organizations
24+100%+300%1$11MSeries A$11M, Oct 2026
22
A construction payroll and compliance platform built for specialty…
38−7%+100%YC$17MSeries A$10M, Mar 2026
23
Farm Genetics Made Easy - Using DNA and Software
25+14%+127%0$5.8MSeed$5.3M, Dec 2025
24
We get patients to their next appointment
10+11%+67%YC$5.5MSeed$5M, Jun 2026
25
The all-in-one EMR built for med spas and elective care
17+42%+89%5$4.5MSeed$4M, Nov 2025
26
AI Coordination Layer for Supply Chain
16+7%+100%0$4.4MSeed$3.9M, Mar 2026
27
The inbox that handles itself
90%−18%0$3.5MPre-seed$3M, Jun 2026
28
AI that finds the right buyers and books sales meetings
50−2%−2%0$3MSeed$3M, Apr 2026
29
AI agents for fintech risk and compliance operations
18+29%+50%1$2.9MSeed$2.4M, Mar 2026
30
Digital banking platform for the 30 million smartphone users in DRC.
50%0%0$500KPre-seed$500K, Feb 2026
31
The cheapest way to borrow money
26+73%+225%1$500KSeed$500K, Jun 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 S23 companies

How many YC S23 companies are there?

220 companies were in Y Combinator's Summer 2023 batch (S23); 178 are active.

Which YC S23 companies are hiring?

37 companies posted roles in the last 60 days, led by HappyRobot (36 roles), Outset (25 roles) and Langdock (12 roles). 87 mark themselves as hiring on YC's directory.

Which YC S23 companies are growing fastest?

By team growth over 6 months (10+ people): Shadeform (+110%), Prosper (+100%) and Readily (+100%).

Which YC S23 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: HappyRobot ($150M), Singularity ($80M) and Bretton AI ($75M).

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