Symbian is a proprietary operating system for wireless telecommunications, succeeding Psion Software's EPOC. Released in 1999, it is owned by a number of companies: Nokia with 47.9% of the share, Ericsson with 15.6%, Sony Ericsson with 13.1%, Panasonic with 10.5%, Siemens AG with 8.4%, and Samsung with 4.5%.