[5] Radisys was founded in 1987 as Radix Microsystems in Beaverton, Oregon, by former Intel engineers Dave Budde and Glen Myers.

[8] Originally located in space leased from Sequent Computer Systems, by 1994 the company had grown to annual sales of $20 million.

[17] Radisys also moved some production to China in order to take advantage of the lower manufacturing costs.

[23] In 2004, the company stopped granting stock options to employees and transitioned to giving restricted shares for some compensation.

[26][27] Radisys continued buying assets when it purchased part of Intel's communications business for about $30 million in 2007.

[30][31][32] Dagenais left the company in October 2012 with former CFO Brian Bronson taking over as CEO.

In 2009, Radisys' biggest customers were Philips Healthcare, Agilent, Fujitsu, Danaher Corporation, and Nokia Siemens Network (NSN).