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YC S18 companies (Summer 2018)

All 131 companies in Y Combinator's Summer 2018 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
36 roles
SkydropXS18
  1. 2Canary Technologies33
  2. 3Ajaib23
See all 22
Fastest growingteam, 6 months
+53%
TitanS18
  1. 2Verse Medical+29%
  2. 3Eden+20%
See all 33
Shrinkingteam, 12 months
−57%
WithinS18
  1. 2BlueCargo−36%
  2. 3Quo (fka OpenPhone)−25%
See all 18
Raised the mostlast 12 months
$270M
AjaibS18
  1. 2Within$70M
  2. 3Corvus Robotics$20M
See all 8
Companies
131
Active
77
Hiring, last 60 days
22
Open roles, 60 days
210
People on these teams
10,559
Showing 50 of 131 companies
CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
One-stop-shop for flexible family care
1,078+3%+8%1$241MSeries D$150M, Nov 2021
Consumer fintech for Indonesia
939+2%+15%23$515MSeries C$270M, Aug 2026
Manage your ledgers and avail Financial Services like Lending on your…
893+7%+12%0$187MSeries C$100M, Aug 2021
Building a world where alternative proteins are no longer alternative.
548+11%+18%0GrantAug 2018
Building Clinical Superintelligence.
541+20%+54%YC$29.1MUndisclosed round$7.9M, Apr 2024
Logistic Management System for E-commerce & Retail in Mexico.
534+2%+8%36$27MSeries B$20M, Aug 2022
Modernizing the hospitality tech stack.
401+7%+35%33$177MSeries D$80M, Jun 2025
We at Leena AI build a virtual assistant that answers employee's…
327+11%+25%20$41MUndisclosed round$1M, Oct 2026
AI-enabled ordering for medical equipment & supplies
246+29%+64%4$3MSeed$3M, Mar 2021
Learning Hub for companies in Latam
235+3%−7%0$34.9MSeries B$25M, Jan 2022
We verify global supply chains for issues like child slavery and…
202−1%+1%0$100KYC investment$100K, Aug 2018
Build and grow your app business
185+13%+41%9$119MSeries C$50M, May 2025
Wealth manager
149+6%+17%12$59.1MUndisclosed round$4.2M, Feb 2024
Simple and secure bookkeeping for Indian businesses.
146+4%+7%0$84.2MNon-equity support$67M, Aug 2021
Making low cost versions of high cost generic drugs.
144+7%+19%12SeedJan 2018
An online provider for greater mental health
143+1%+6%YC$53.3MGrant$2M, May 2022
Payment operations tools for money movement.
127+4%−15%YC$183MSeries C$50M, Mar 2022
Africa's leading supply chain technology platform.
127−2%−7%0$164MSecondary$79M, Mar 2025
Honeylove makes functional undergarments for women
120+3%+8%0$16MSeries A$13M, Sep 2019
Full-stack grocery delivery in LatAm
116−1%−3%2$32.6MSeries A$22.5M, Jan 2022
Mobility and payments platform for Latin America
1140%−1%0$72.7MSeries A$45.7M, Oct 2018
Our platform enables creators to build experiences, games, and worlds…
107 −12%0$10MSeries A$7M, Jan 2021
Lending Intelligence Software
103+14%+41%3$12.1MSeries A$12M, Jul 2021
We provide primary care in senior living communities.
78−5%−6%10$58.5MSeries B$15M, Dec 2023
Company Brain for people and agents to work in harmony.
77−57%−57%11$90.4MUndisclosed round$70M, Sep 2026
AI Platform for Efficient and Sustainable Operations
77−5% 0$35.8MSeries A$30M, Jun 2024
Titan is an award-winning wealth manager with a mission to increase…
75+53%+103%4$73MUndisclosed round$58M, Jan 2023
The space infrastructure services company
67+14%+24%0$237MPost-IPO equity$25M, Jun 2026
The complete toolkit to sell travel.
660%+16%5$56.2MSeries B$30M, Oct 2019
AI Agents for Regulatory Compliance
66−7%+6%0$8MSeries A$8M, Aug 2021
Shopify for experiences
65+7%−2%1$59.6MSeries A$10M, Oct 2026
Skills-based talent management solutions for a dynamic workforce.
65+3%+20%YC$2MSeed$2M, Dec 2022
Connecting Survivors to Careers in Tech
62+5% 0$270KGrant$150K, Sep 2026
Modern, AI-powered clinical trial software platform.
54−4%+4%0$57.6MSeries B$40M, May 2022
Your AI agent for creating anything customer-facing, in minutes.
52+8%−4%3$71.6MSeries B$50M, Apr 2022
Robotic human cell manufacturing
49+7% 4$20.8MSeries A$19M, Nov 2023
AI Document Fraud Detection for Banks, Credit Unions & Lenders
46+7%+7%2$38.7MSeries B$25M, Jan 2023
Autonomous drones to help warehouses scan inventory.
46+15%+21%0$46MUndisclosed round$20M, Aug 2026
Anima - Design Agent | AgentGrid.io - Shared drive for humans & agents
45−12%−8%0$12.6MCorporate round$10M, Feb 2026
The all-in-one business phone for teams.
43−17%−25%11$171MUndisclosed round$105M, Sep 2025
The Computer Science Proficiency Assessment (CSPA™) is a…
34+3%+3%0$1.6MSeed$1.5M, Sep 2018
Trends prediction for marketers
33+14%+22%2$1.8MSeed$1.8M, Jun 2019
We build cities for people, not cars.
33−3%−17%2$40MSeries A$30M, Jan 2022
The automated solution for complex freight transactions.
32−16%−36%YC$19MSeed$11M, Feb 2023
Automated receptionist that answers missed calls for local businesses
320%0%0$120KSeed$120K, May 2020
AI Clinical Assistant for Doctors
28 −7%YC$6.6MSeries A$5M, Dec 2020
AIoT monitoring, workflow, and evidence systems for regulated labs.
26+8%+8%0$120KSeed$120K, Jul 2019
Next-gen ingredients to decarbonize consumer products, starting w/…
25−11%−19%0$33.5MGrant$1M, Jan 2024
The funnel builder built for health & wellness brands.
250%+32%0
Database for AI
23−15%−23%YC$19.6MSeries A$11M, Mar 2024

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 S18 companies

How many YC S18 companies are there?

131 companies were in Y Combinator's Summer 2018 batch (S18); 77 are active.

Which YC S18 companies are hiring?

22 companies posted roles in the last 60 days, led by SkydropX (36 roles), Canary Technologies (33 roles) and Ajaib (23 roles). 28 mark themselves as hiring on YC's directory.

Which YC S18 companies are growing fastest?

By team growth over 6 months (10+ people): Titan (+53%), Verse Medical (+29%) and Eden (+20%).

Which YC S18 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Ajaib ($270M), Within ($70M) and Corvus Robotics ($20M).

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