Other than Herbert Hoover, Harry Truman, Jimmy Carter, and George H.W. Bush, Donald Trump is the only President in this list who actually ran a business, paid salaries, taxes, and overhead, and made business decisions. In the cases of Truman, Carter, and Bush, they were on the fringes of politics even when they were operating their businesses. In the case of Hoover, he was a successful mining engineer but had spent almost 15 years in the nonprofit and government sectors before becoming President. Trump is unique in that he was entirely in the private sector prior to 2015, most of that time running his enterprises.
The Bush business was a CIA front company—don’t know if that counts.
Lol.
Wallace here are some others to add to the list. Geo. Washington, surveyor and plantation owner. T Jefferson, plantation owner, farmer, and nail manufacturing business. I think Jackson was too. (No, some Employees...not all slaves. Like lots of businesses dealt with lots of debt and were presumably taxed.) U. Grant, Store owner in Galena IL. Warren Harding owned newspapers in Ohio. If you look at earlier Presidents you will probably find that they had a lot of small farms and practiced law.