They pre-date the literal magazine, but definitely Vanderbilt, John Astor, Jay Gould, Rockefeller if you count that standard oil was broken up into multiple one

They pre-date the literal magazine, but definitely Vanderbilt, John Astor, Jay Gould, Rockefeller if you count that standard oil was broken up into multiple ones, and Moses Taylor if you count that he did not found, but rescued and built up citibank from an early stage, not unlike tesla.