YC S09 Startups
Every Y Combinator Summer 2009 company we currently index.
About YC S09
The Y Combinator S09 batch (Summer 2009) brought 14 tech startups into our index. This page lists every S09 company we currently track, with logos, taglines, and links straight to their own sites — no paywalled middleman. Notable S09 companies include Mixpanel, Stripe, Bump, DailyBooth, and Directed Edge. Each profile surfaces team size, founding year, location, and open roles when their careers page is publicly scrapable. The S09 cohort skews toward Consumer, Fintech, and Analytics — common patterns we see in this batch. Recurring tags across these companies: Fintech, Marketplace, B2B, Analytics, Data Visualization. The directory's filter UI accepts any of them as a query. Geographically, the S09 batch we have leans toward San Francisco, Mountain View, and Palo Alto, with the rest spread across remote-first teams and other hubs. 2 of these are currently flagged as trending based on momentum signals; and the listing refreshes whenever the scrape runs, so changes propagate without a manual edit.
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Frequently asked questions
What is the YC S09 batch?
S09 is the Y Combinator batch code for the Summer 2009 cohort. Companies joining a YC batch go through a 3-month program in California and demo their product at the end. techstartupslist.com indexes 14 tech startups from this batch.
How many companies are in YC S09?
Our index currently tracks 14 active tech startups from the YC S09 batch. New companies appear here automatically when our daily scraper finds them; companies that shut down are flagged inactive and hidden from listings.
Which companies graduated from YC S09?
Among the S09 companies indexed here: Mixpanel, Stripe, and Bump, and 11 more on this page. Click any profile for category, team size, founding year, and open roles.
Where can I find open jobs at YC S09 startups?
Open roles from indexed S09 companies appear on our /jobs page, aggregated alongside roles from other indexed startups. Each role links directly to the company's official application page.
How often is the YC S09 page updated?
Automated scrapers refresh this page daily. The last index update was 2026-07-17. Inactive companies fall out of the count automatically — we don't keep dead listings live.