Acquired
What they do:
The frontpage of the internet.
Quick facts:
HQ: San Francisco, CA, United States
Y Combinator Summer 2005 Startups
This list has 8 startups and was last updated on Oct 15, 2026. Biggest hubs: San Francisco (3) and Boston (2). Largest teams: Reddit, Loopt, and TextPayMe.
8 startups
Loopt
Acquired
What they do:
Loopt, based in Silicon-Valley and backed by leading venture capital firms Sequoia Capital and New Enterprise Associates, has created an interoperable…
Quick facts:
HQ: San Francisco, CA, United States
TextPayMe
Acquired
What they do:
Founded in 2005, TextPayMe is an SMS payment service that lets you send money to other people using cell phone text messaging. TextPayMe lets you send money…
Quick facts:
HQ: Seattle, WA, United States
Clickfacts
Acquired
What they do:
ClickFacts is a Malware Software Solutions company for buyers and sellers of online media. Its automated plug and play malware discovery solution tests online…
Quick facts:
HQ: San Francisco, CA, United States
Kiko
Acquired
What they do:
We're the best online calendar solution to ever exist. Period.
Quick facts:
HQ: Boston, MA, United States
YC S05Early stage
Infogami
Shut down
What they do:
What is Infogami? The art of transforming data into meaningful information. Infogami Business Intelligence (BI) solutions turn raw data into information…
Quick facts:
HQ: London, United Kingdom
Memamp
Shut down
What they do:
Better Desktop search solution.
Quick facts:
HQ: Boston, MA, United States
YC S05Early stage
Simmery
Shut down
Quick facts:
HQ: Wallingford, CT, United States
YC S05Early stage
Questions and answers
How many startups are on this list?
There are 8 startups on this list, last updated on Oct 15, 2026.
Which of them are hiring?
None of them shows open roles right now.
Which of them have the largest teams?
By team size: Reddit (2,000 employees), Loopt (11 employees), and TextPayMe (11 employees).
Where are they based?
The biggest hubs are San Francisco (3) and Boston (2).