Kaltho was a wealthy Hutt from a prominent Kajidic. His immense fortune was gained from daily intake of hundreds of thousands of credits earned through his ownership of many large spaceports and loading docks on Nar Shaddaa. His vast holdings allowed him to also branch into smuggling, weapons dealing and dealing in the spice trade.
At some time during the Galactic Civil War, Kaltho traveled to Cloud City to participate in an auction for the Jewel of Yavin, a valuable corusca gem. He traveled with a large retinue of Gamorrean and Nikto guards, servants, bookkeepers and his chief enforcer, Kerek.
A ton of evidence is pointing toward Kaltho the Hutt being the secret Hutt lord shaping Tatooine, adding it to his powerful Empire. See how he operated during the time of the Empire, through to the time of the Book of Boba Fett, how he outsmarted other Hutts, likely the Twins, and why he backed the Kintan Striders speeder bike gang on Tatooine, working with his Pyke allies.