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YC S17 companies (Summer 2017)

All 125 companies in Y Combinator's Summer 2017 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
47 roles
JerryS17
  1. 2Flock Safety32
  2. 3BillionToOne21
See all 23
Fastest growingteam, 6 months
+38%
PrelimS17
  1. 2Skyways+16%
  2. 3AssemblyAI+16%
See all 21
Shrinkingteam, 12 months
−45%
Cairns HealthS17
  1. 2Entocycle−21%
  2. 3Helium Health−20%
See all 14
Raised the mostlast 12 months
$200M
Flock SafetyS17
  1. 2Standard AI$900K
  2. 3tpaga$700K
See all 3
Companies
125
Active
54
Hiring, last 60 days
23
Open roles, 60 days
185
People on these teams
8,908
Showing 50 of 125 companies
CompanyTeam6 mo12 moOpen rolesTotal raisedLast round
The first public safety operating system that eliminates crime.
1,446+1%+6%32$1.2BSeries I$200M, Apr 2026
Next-gen digital payments provider for India.
982+8%+8%1$93.9MSeries C$53M, Feb 2025
The genetic testing platform detecting and measuring disease.
866+13%+26%21$426MSeries D$130M, Jun 2024
Customized fertility benefits for modern companies.
632+2%+11%3$114MSeries C$75M, Aug 2021
Talent engagement platform
5070%+7%0
Jerry is building the AI agent to manage all your physical assets.
409+4%+19%47$242MSeries C$110M, Aug 2023
Transforming cities and rural areas through AV transit and technology
369+4%+7%9$310MCorporate round$7M, Oct 2025
API-connected healthcare infrastructure.
310−5%−9%0$255MSeries D$142M, Oct 2021
Sales software for roofers. Aerial measurements + proposals in seconds
295 +7%5$43.8MSeries B$23.5M, Jan 2025
Headstart uses Machine Learning to help companies decide on who to…
220−2%−2%0$16.6MSeed$5M, Sep 2019
Where Single Muslims meet
187+2%+10%2$10.9MSeries A$7M, Jan 2024
YC for your career
152+1%−11%0$29.2MSeries B$17M, Jul 2022
Enable creators and developers to generate realistic AI personas
147−9%+6%2$47.9MSeries B$25M, Mar 2022
Autonomous electric airplanes
140+6%+40%8$88.1MSeries B$40M, Sep 2024
Just Appraised makes software for local governments.
140+6%+5%1$24.8MSeries A$12.3M, Apr 2024
Pop Meals is a restaurant chain without chefs. All recipes are…
134+2% YC$27MSeries B$18M, Feb 2020
The best way to build Voice AI apps
116+16%+8%7$113MSeries C$50M, Dec 2023
AI-Powered Building Management
109+2%−8%1$82.6MSeries C$60M, Nov 2021
Africa's #1 healthcare technology provider.
109−6%−20%8$62.7MSeries B$30M, Jun 2023
AI-powered checkout for retail.
87−10%−8%YC$239MUndisclosed round$900K, Aug 2026
OneLocal is a CRM for local businesses.
86+2%−4%2Series AOct 2019
The operating system powering ecommerce fulfillment
82+1%+3%3$46.5MSeries B$31M, Mar 2021
Simplifying payouts at scale
680%−8%0$46.5MSeries B$500K, Apr 2022
Creating a new form of air transportation to advance our civilization
64+16%+45%8$58.1MDebt$5M, Jun 2025
LTSE is an ecosystem for visionary business.
64 −4%0$169MSeries C$100M, Jun 2022
We help dealerships appraise vehicle trade-ins more efficiently…
61+22%+45%0$120KYC investment$120K, Aug 2017
Dating & relationship coaching sessions for individuals and couples
61+11%+5%1$2MSeed$2M, Jan 2018
We make high definition radar allowing self-driving cars to see in…
590%−6%2$22.5MUndisclosed round$4M, Nov 2023
Build better banking
58+38%+32%9$4MUndisclosed round$2M, Mar 2022
Platform for unique products produced on-demand at mass-scale
55−5%−7%0$5.5MNon-equity support$4.2M, Sep 2022
Furniture rental for consumers and businesses.
51+6%+24%0$76MUndisclosed round$30M, Apr 2021
AI platform for unifying codes, assemblies, products, and specs
48+7%+33%3$7.6MSeries A$3.5M, Aug 2024
The financial foundation for every real estate development decision
47+7% 0$9.9MDebt$1.8M, May 2023
First financial Superapp of Latin America
46+5%+10%0$15.8MCorporate round$700K, Mar 2026
Data-driven teacher hiring
45−4%−4%YC$120KSeed$120K, Jan 2018
Customer intelligence for Enterprise CX teams. The grounded…
40−9%−11%1$1.8MGrant$212K, Jul 2020
Turning food waste into Biochar to remove CO2 from the atmsophere
39−5%−9%0$9.5MNon-equity support$250K, Apr 2025
On demand web app help
39+8%+18%0$120KYC investment$120K, Aug 2017
Py is democratizing access to career opportunities in tech
38−3%−3%0$120KYC investment$120K, Aug 2017
Marketplace for local activities.
37+12%+28%9$120KYC investment$120K, Aug 2017
We help kids stay curious by creating better explanations.
35−5%−5%0$4MSeed$2M, Oct 2017
Chat for gaming communities
31+3%−6%0$10.2MUndisclosed round$7M, Jan 2021
Turnkey security & hassle-free cyber insurance from leading insurers
24−8%−8%0$15MSeries A$8M, Oct 2023
Early detection of Alzheimer's disease
230%+5%0$14.6MUndisclosed round$3.5M, Oct 2023
Your voice. Your health. We care.
22−42%−45%0$5.3MSeed$5.2M, Oct 2017
Decarbonized heat and power cheaper than fossil fuels
21 −5%0$5.3MUndisclosed round$3.2M, Mar 2024
bxblue is a marketplace for people with guaranteed income in Brazil.…
20+5%−5%0$7MSeries A$7M, Jan 2021
Automated factory to produce insect protein for farm animals.
19−17%−21%0$18.6MUndisclosed round$2.6M, Jul 2024
Automating regulatory approval & compliance for life science companies
18+13% 0$2MSeed$1.9M, Oct 2017
180%−10%0$150KSeed$120K, Apr 2022

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 S17 companies

How many YC S17 companies are there?

125 companies were in Y Combinator's Summer 2017 batch (S17); 54 are active.

Which YC S17 companies are hiring?

23 companies posted roles in the last 60 days, led by Jerry (47 roles), Flock Safety (32 roles) and BillionToOne (21 roles). 19 mark themselves as hiring on YC's directory.

Which YC S17 companies are growing fastest?

By team growth over 6 months (10+ people): Prelim (+38%), Skyways (+16%) and AssemblyAI (+16%).

Which YC S17 companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Flock Safety ($200M), Standard AI ($900K) and tpaga ($700K).

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