KJOY is an FM radio station serving the Stockton area with its lite rock format. It broadcasts on the FM frequency 99.3 MHz and is under ownership of Cumulus Media. Its studios and transmitter are located separately in Stockton.KJOY 99.3 signed on the air as KJAX in 1968 with an Instrumental Easy Listening Music format also known as Elevator Music and Beautiful Music. It was known as Cloud 99. It was originally owned by Joseph Gamble Stations Inc. and was the FM sister station to KJOY 1280 AM.