I suspect all of the exempt employees of Meta, Apple, Google, Microsoft, Intel, and pretty much the ones in any of the other fortune 100 companies.
There is a funny thing though, you can have "too much" in your 401k/IRA :-). When you hit 72 you have to withdraw 10% annually and that amount can put you into the top tax bracket if you've been saving your whole career and have more than a million bucks in there.