Ableton AG

Ableton makes Ableton Live, a unique product for producing and performing music with a computer, Push, an instrument that puts the fundamental elements of music-making at your fingertips, and a technology that keeps devices in time over a wireless network: Link.

Ableton currently employs around 300 people from its offices in Berlin, Germany; Pasadena, California and Tokyo, Japan.

You may or may not have heard of Ableton, but you've almost certainly heard it: in your favorite songs, at concerts, in clubs, in TV theme tunes, during awards shows, and at the theater. 

Ableton's Imprint: http://www.ableton.com/imprint/