RealNetworks’ Chief Operating Officer John Giamatteo will resign effective April 2, the company said today in an SEC filing.

No reason was given for his departure, but in a statement, Chairman and CEO Rob Glaser said: “John has been an excellent executive at Real for more than four years. Among his many accomplishments, John built a strong Technology Products and Services division that delivers digital entertainment to mobile carriers around the world. He has also built a strong leadership bench that I will be working with to ensure a smooth transition and to make sure we continue executing on our business plans.” Giamatteo added: “I know that I am leaving them in the capable hands of an excellent leadership team so I have every confidence in their ability to succeed.”