YC S05 Startups
Every Y Combinator Summer 2005 company we currently index.
About YC S05
The Y Combinator S05 batch (Summer 2005) brought 6 tech startups into our index. This page lists every S05 company we currently track, with logos, taglines, and links straight to their own sites — no paywalled middleman. Notable S05 companies include Reddit, Clickfacts, Kiko, Loopt, and Parakey. Each profile surfaces team size, founding year, location, and open roles when their careers page is publicly scrapable. The S05 cohort skews toward Consumer, Security, and Productivity — common patterns we see in this batch. Recurring tags across these companies: Community, Social Media, Social, Social Network, Calendar. The directory's filter UI accepts any of them as a query. Geographically, the S05 batch we have leans toward San Francisco, Mountain View, and Cambridge, with the rest spread across remote-first teams and other hubs. 1 of these is 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 S05 batch?
S05 is the Y Combinator batch code for the Summer 2005 cohort. Companies joining a YC batch go through a 3-month program in California and demo their product at the end. techstartupslist.com indexes 6 tech startups from this batch.
How many companies are in YC S05?
Our index currently tracks 6 active tech startups from the YC S05 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 S05?
Among the S05 companies indexed here: Reddit, Clickfacts, and Kiko, and 3 more on this page. Click any profile for category, team size, founding year, and open roles.
Where can I find open jobs at YC S05 startups?
Open roles from indexed S05 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 S05 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.