Ask HN: What are some highly profitable small companies?

[newsisan]

E.g. AppSumo

[stevenkovar]

Humbled that you chose to mention AppSumo!

Some companies I like and that we've worked with recently at AppSumo: WP Engine (wpengine.com), Backblaze (backblaze.com), Treehouse (teamtreehouse.com)

[OzzyOsbourne]

37signals can be considered small