Some of the richest businesspeople in the U.S. could be much less rich today if Elizabeth Warren’s wealth tax had been in place.

How much? Amazon AMZN, +2.49% founder and Chief Executive Jeff Bezos’ fortune would be about $87 billion versus the $160 billion it was estimated at last year. Microsoft MSFT, +2.27% founder Bill Gates would have seen his wealth cut to $36 billion from $97 billion. And Berkshire Hathaway’s BRK.A, +0.43% BRK.B, +0.82% Warren Buffett would be sitting on about $27 billion instead of $88 billion.