Get an API keyGet an API keyAll 16 companies in Y Combinator's Winter 2009 batch, with team size, growth, open roles and funding.
Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.
AirbnbW09
VolantioW09| Company | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|
Post-booking revenue and capacity optimization for airlines… | 35 | +9% | YC | $8.6M | Series A$6M, Sep 2022 | |
 Heyzap (acquired by Fyber for $45m in 2016) is one of the largest… | 3 | 0 | $8M | Series B$4.3M, Dec 2012 | ||
Book accommodations around the world. | 73,146 | 202 | $8.9B | Post-IPO debt$2.5B, Mar 2026 | ||
Browser-based spreadsheet. | ||||||
 Sensors and software for energy tracking. Like 'fitbit' for your… | 0 | SeedJan 2009 | ||||
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 Email search for iPhone. Acquired by Google in Feb 2010. | ||||||
 Sync and stream your music across any device. Acquired in 2009. | 0 | SeedJan 2009 | ||||
 | 0 | $2.8M | Series A$2M, Apr 2010 | |||
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Every launched company in YC's public directory, with its batch, status, industry and location. New companies show up the week YC lists them.
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.
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.
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.
# 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
16 companies were in Y Combinator's Winter 2009 batch (W09); 1 are active.
1 companies posted roles in the last 60 days, led by Airbnb (202 roles). 1 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Volantio (+9%).
No reported rounds after their YC batch in the last 12 months.