CrustdataGet an API key

YC W13 companies (Winter 2013)

All 46 companies in Y Combinator's Winter 2013 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
44 roles
FivetranW13
  1. 2InfluxData9
  2. 3RADAR4
See all 6
Fastest growingteam, 6 months
+10%
RADARW13
  1. 2Watsi+6%
  2. 3Fivetran+5%
See all 6
Shrinkingteam, 12 months
−8%
InfluxDataW13
  1. 2SimplyInsured−4%
  2. 3Goldbelly−3%
See all 4
Raised the mostlast 12 months
$170M
RADARW13
Companies
46
Active
17
Hiring, last 60 days
6
Open roles, 60 days
62
People on these teams
3,806
Showing 46 of 46 companies
CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
The leader in automated data movement
1,934+5%+13%44$853MDebt$125M, May 2023
The easiest way to create a beautiful, mobile optimized website.
4680%−1%1$17.5MSeries A$10M, Aug 2018
RADAR is building technology to completely transform the in-store…
241+10%+23%4$310MSeries B$170M, May 2026
HR for small businesses: onboarding, payroll and benefits.
214−5%−9%0$584MUndisclosed round$500M, Oct 2021
The platform for building and operating time series applications.
169 −8%9$201MDebt$30M, Feb 2023
We're Robinhood for pre-IPO startups. Everyone can invest $100.
139+4%+13%YC$25.3MUndisclosed round$3.5M, Nov 2024
Empowering restaurants and small food makers to ship nationwide.
115+1%−3%YC$133MSeries C$100M, May 2021
Captures user interactions with no code to generate analytics.
98−5%−15%0$218MSeries D$110M, Dec 2021
Papyrus → Parchment → Paper → Padlet
81+1%+8%2$12.7MSeries A$11M, Apr 2019
Kalibrr connects SEAsian talent to your local & global jobs.
72+3% 0$9.4MConvertible note$5.5M, Mar 2019
BuildZoom is a better way to remodel. We connect homeowners to the…
61+2%−21%0$23.7MSeries B$9M, Dec 2021
We sell health insurance to small businesses 100% online.
45−2%−4%2$8.4MPrivate equity$5.9M, Jan 2023
Airware provides end-to-end solutions that enable enterprises to…
43 +2%0$120MUndisclosed round$8.5M, Apr 2018
Watsi is the first global crowdfunding platform for medical…
35+6%+6%0$1.2MGrant$1.2M, Mar 2013
Analytics for impatient people.
28+12%+22%0$46.3MSeries C$18M, Dec 2017
Etleap is an ETL solution for creating perfect data pipelines.
24 +20%YC$1.6MSeed$1.5M, Apr 2018
CrowdMed harnesses the wisdom of crowds to solve difficult medical…
80%0%0$3.5MEquity crowdfunding$403K, Apr 2017
Changing divorce for good by making it a way less horrible experience…
70%0%0$6.5MUndisclosed round$3.1M, Jul 2016
Online circuit simulator and electronic schematic editor.
5  0SeedMar 2013
Medisas builds workflow & collaboration software for hospitals.
50%0%0$12.6MSeries A$10.6M, Dec 2016
Lawdingo provides virtual paralegal services to law firms.
4  0$810KSeed$690K, Sep 2014
Online Auctions for Authentic (Women's) Designer Goods
3  0$120KYC investment$120K, Mar 2013
crowdfunding platform for science
3  0$1.2MUndisclosed round$1.2M, Dec 2014
Simple invoicing
1  0$700KSeed$700K, Jan 2013
VaycayHero is a marketplace of professionally managed vacation…
1  0$4.3MSeed$837K, May 2016
Data and AI platform for Ecommerce & Cross-Border Logistics
1  0$2.1MUndisclosed round$1.6M, Nov 2015
Ultra-short feedback surveys on tablets mounted in businesses. Higher…
1  0$120KYC investment$120K, Mar 2013
StyleUp brings effortless joy to getting dressed with daily,…
  
Collaborative Screen Sharing, you each get your own mouse, and…
  0
The easiest way to prototype web applications.
  
Wearable computing hardware: biosignal gesture recognition
  
Kickstarter for physical products. Shop exclusive product launches.
  
Educational assessments made easy. Eliminating paper-based exams in…
  
Big Data Analytics
  
The App Store for Server Software
  
Fastest, easiest, and most affordable way for small business owners…
  
A universal urban transit app. Given all transportation options…
  
Simple password & identity management for teams. Acquired by LogMeIn…
  
Music, Metrics... Meritocracy. (Upload Music, Connect your Social…
  0$97KYC investment$97K, Jan 2013
Stop missing deliveries. Ship to Swapbox and pick up at our kiosks.
  
Radiology in the cloud. X-rays, CAT scans, MRI's, and…
  0$120KSeed$120K, Oct 2014
FlightCar is the Airbnb of Car Rentals at Airports. We allow people…
  
A mobile wallet that allows you to pay everywhere credit cards are…
  
Logiblock engineers electronics and development tools to dramatically…
  
IMPORTANT: The original YC founders are no longer involved with this…
  
Predicting workplace performance through neuroscience
  0$120KSeed$120K, Apr 2014

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 W13 companies

How many YC W13 companies are there?

46 companies were in Y Combinator's Winter 2013 batch (W13); 17 are active.

Which YC W13 companies are hiring?

6 companies posted roles in the last 60 days, led by Fivetran (44 roles), InfluxData (9 roles) and RADAR (4 roles). 7 mark themselves as hiring on YC's directory.

Which YC W13 companies are growing fastest?

By team growth over 6 months (10+ people): RADAR (+10%), Watsi (+6%) and Fivetran (+5%).

Which YC W13 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: RADAR ($170M).

Browse YC companies

By batch

Show fewer

By industry

Show fewer

By location

Show fewer

By founders' past employer

Show fewer