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YC S12 companies (Summer 2012)

All 83 companies in Y Combinator's Summer 2012 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
91 roles
CoinbaseS12
  1. 2Instacart85
  2. 3Zapier12
See all 11
Fastest growingteam, 6 months
+9%
SubmittableS12
  1. 2Mattermost+5%
  2. 3ClassDojo+4%
See all 9
Shrinkingteam, 12 months
−10%
RainforestS12
  1. 2Coinbase−6%
  2. 3Plivo−4%
See all 5
Companies
83
Active
22
Hiring, last 60 days
11
Open roles, 60 days
214
People on these teams
38,114
Showing 50 of 83 companies
CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
Marketplace for grocery delivery and pickup
25,483+2%+5%85$2.9BPrivate equity$232M, Nov 2021
Buy, sell, and manage cryptocurrencies.
6,979−5%−6%91
The easiest way to automate your work.
1,530+3%+8%12$1.4MUndisclosed round$1.4M, Apr 2024
Unlocking the power of biotech with modern software for modern science
813+3%+3%4$412MSeries F$100M, Nov 2021
Communication app for K-8 teachers, kids, and families
523+4%+1%1$191MUndisclosed round$125M, Apr 2024
The platform that powers technology in the classroom.
374+5%+17%0$43.3MSeries B$30M, Dec 2014
Pioneer in immersive code education. Acquired by Zovio (NASDAQ: ZVO)…
334−3%−2%0SeedAug 2012
Marketplace connecting consumers to financial advisors
282+2%+1%2$161MSecondary$110M, Aug 2021
Private sector Healthcare.gov.
255+2%+3%2$6.6MUndisclosed round$6.6M, Feb 2017
The best way to launch, manage and measure social impact programs
246+9%+7%7$156MUndisclosed round$91.5M, Aug 2024
Talent Acquisition Suite that combines ATS + Talent CRM
206+6%+9%0$123MPrivate equity$50M, Jan 2022
Voice AI Agents for customer engagement, including WhatsApp, SMS &…
195 −4%1$2MSeed$1.8M, Dec 2012
Secure Collaboration for Technical Teams
169+5%+8%8$73.5MSeries B$50M, Jun 2019
Make the world happier.
153−1%−2%0$2.8MSeed$2.8M, Aug 2012
no-code end-to-end testing that integrates with any CI/CD pipeline
112−4%−10%0$41.2MSeries B$25M, Jan 2018
Acquired by Carlyle. Edtech and other technology
99+2%−1%0SeedAug 2012
Marketing analytics for the world's biggest brand marketers
56+2%−2%0$21.7MSeries B$14M, Jul 2018
The only end-to-end crowdfunding platform built for today’s creators
48 +4%1$3MEquity crowdfunding$3M, Jun 2025
Soylent is a simple, nutritious, and affordable food that possesses…
43+5%+5%0$133MSeries B$50M, May 2017
Online VC
370%0%0$6.5MSeries B$6.5M, Oct 2017
Simple, fun, and fast electric vehicles.
32−3% 0$73MSeries B$60M, Dec 2018
The Human Diagnosis Project.
17  0$2.8MUndisclosed round$2.8M, Oct 2013
We are building a "transparent opaque" airfare and hotel booking site…
17+21%+21%0$2.5MConvertible note$2.5M, Nov 2014
Thread makes it incredibly easy to dress well, using stylists and AI
150%0%0$40.7MSeries B$3.3M, Nov 2021
Acquired by Xenon Ventures.We enable website developers to hook into…
14 −7%0$1.8MPrivate equity$1.8M, Dec 2015
We're making ecommerce simple connecting brands with sales channels
120%−8%YC
Helping developers scale their applications with ease.
110%+22%0SeedJul 2014
A platform to plan, book and manage global and group travel.
100%+43%0$852KSeed (before YC)$800K, May 2012
70%0%0$37.9MSeries C$10M, Apr 2016
Virool provides native video advertising experience for the biggest…
70%0%0$18.6MConvertible note$12M, Aug 2016
Celery is a platform for pre-orders (www.trycelery.com). Accept…
60%0%0$2.3MSeed$2.3M, Jan 2015
Big Data Meets Startup Investing The best tool for tracking and…
50%0%0$17.2MSeries B$7.3M, Mar 2016
Insurance Billing APIs for Healthcare Businesses
4  0$25.2MSeed$22.7M, Dec 2015
Telepresence robots
4  0$1.9MUndisclosed round$1.9M, Jan 2014
The 401(k) that helps you grow
3  0SeedAug 2012
OmniVirt is the leading VR Advertising platform for brands and…
2  0Convertible noteOct 2016
Simple 3d modeling software for 3d printers.
2  0SeedAug 2012
Mobile application prototyping. Now part of Google.
1  0$3.8MSeries A$3.8M, Jul 2013
Canopy Labs automates customer analytics for small and medium-sized…
1  0$2.1MUndisclosed round$564K, Mar 2014
Dead simple statistical analysis software. Like R or SPSS but easy to…
1  0AngelJan 2014
A fun image sharing community.
1  0SeedAug 2012
We're a mobile on-device profiling and ad-serving platform initially…
1  0SeedAug 2012
Kippt is a social bookmarking service
1  0SeedJun 2012
The future of package delivery. We are building a network of…
1  0$1MConvertible note$1M, Aug 2012
Changing the way companies review employee performance with…
1  0SeedAug 2012
Scoutzie is a curated community for the best mobile designers. If…
1  0SeedAug 2012
Mobile travel guides done right. Personalized, context-aware, and…
  
Pandora meets Yelp for K-12 educational videos. We match each…
  
Easy mailing lists
  
Mobile advertising
  

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 S12 companies

How many YC S12 companies are there?

83 companies were in Y Combinator's Summer 2012 batch (S12); 22 are active.

Which YC S12 companies are hiring?

11 companies posted roles in the last 60 days, led by Coinbase (91 roles), Instacart (85 roles) and Zapier (12 roles). 4 mark themselves as hiring on YC's directory.

Which YC S12 companies are growing fastest?

By team growth over 6 months (10+ people): Submittable (+9%), Mattermost (+5%) and ClassDojo (+4%).

Which YC S12 companies raised the most?

No reported rounds after their YC batch in the last 12 months.

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