There are notable exceptions, but Warren Buffet is not one of them.
The top 10 are: Gates, Buffett, Ellison, Charles Koch, David Koch, Christy Walton, George Soros, Sheldon Adelson, Jim Walton, Alice Walton Considering how hard the Democrats and Progressives go after the Waltons and Kochs you know they have to be relativity conservative. Adelson was a Democrat but when he got wealthier as a Vegas Casino owner he switched. Could have something to do with his many fights with the local unions.
I’m sure a lot of them are neutral as far as politics goes and will curry favor with which ever party or politician that will aid them in their quest for wealth and power.