Although BP has its international headquarters in central London, most of its UK division (chemicals and energy) with Air BP UK (aviation fuel) is headquartered at Sunbury-on-Thames, and the UK's third largest company by stock market value; nearby is Kingston Technology Europe (the world's second largest producer of flash memory), just inside the Surrey boundary; ADT UK (fire alarms) is at the end of the M3 in Sunbury, and Chubb UK (owned by UTC) is on the other side of the roundabout, and M3. Enterprise Rent-a-Car UK is near Thorpe, near to Cemex UK and Thorpe Park (situated on a series of former gravel pits). Shepperton Studios is next to Littleton, Spelthorne.