Since kart manufacturers like creating alternate brands to get a different color scheme and some minor geometry changes out in the market, there’s some confusion as to where to get parts. During my kart search this winter, I did a bunch of website searches, looked up stated locations on Google Maps to find if the “manufacturer”'s address was a factory or just an office, and checked the FIA Karting homologation documents.
SodiKart (France) - Sodi, Alpha
OTK Kart Group - TonyKart, EOS, Kosmic Kart, Redspeed, Exprit. Recently left: FA Kart
Tinini Group - CRG, GP, DR Kart, LH Kart, Evokart. Recently discontinued: Zanardi
BirelART - Birel, Ricciardo, Charles Leclerc, Kubica, CompKart
IPK - Praga, Formula K, OK1, RS Kart, ItalKart. Note: IPK is the only manufacturer that lists their chassis’ weight on their site! Everyone else just says they’re the lightest.
Parolin - Parolin, Merlin, Vemme, Energy
Breda - Kart Republic, Alonso, Will Power
Emme Racing SAS - Mad Croc, Race Factory, Drago, Magik Kart , AK USA
Righetti Ridolfi - Mac Minarelli, AllKart, Extreme, Gold
TBKart - TBKart, GFC, Trackmagic
Drew Price Engineering (Australia)- Arrow, Sera, Monaco. Recently discontinued: Deadly
Independents include Margay (in St. Louis, Missouri, USA), TopKart (owned by Comer), Haase, Mach 1, Swiss Hutless, Wright, Gillard, and Tecno.
Intrepid karts just magically appear from somewhere. I would not be surprised if Rodney Berryhill is making them in an Italian-sounding town in Oklahoma.