AlphaTheta Corporation is the Yokohama, Japan-based company behind Pioneer DJ, designing and manufacturing equipment for professional DJs, producers, and music venues. The company traces its roots to 1994, when the Pioneer Corporation division introduced the CDJ-500, the first flat-top DJ CD player. It operated as Pioneer DJ Corporation after being spun out, then rebranded as AlphaTheta Corporation — a name that references the alpha and theta brainwave states associated with peak creative performance — while continuing to sell flagship gear under the long-established Pioneer DJ label.

The product catalog spans multi-player DJ decks such as the CDJ-3000X, club and battle mixers including the DJM series and the high-end euphonia rotary mixer, all-in-one DJ controllers like the DDJ-FLX and DDJ-GRV lines, HDJ-series professional headphones, and portable speakers such as the WAVE-EIGHT. The company also develops rekordbox performance and library-management software, and its ecosystem extends to Serato following that acquisition by the parent group.

Pioneer DJ hardware is the de facto standard in most professional booths worldwide, and AlphaTheta's CDJ/DJM setup is the expected rider in the majority of touring electronic artists' specs. The company is headquartered in Yokohama with subsidiaries in the US, UK, China, and Singapore, and production in Vietnam; it is a subsidiary of Noritsu Koki Co., Ltd.

AlphaTheta has 13 products cataloged on Equipboard, including DJ Controllers, Headphones & In-Ear Monitors, and DJ Mixers. Their gear is featured by 6 artists, with the strongest followings in Electronic, Pop, and Funk / Soul. Notable users include DJ TECHNORCH, Guy Berryman, and Toro y Moi.