Corporations should not exist, at the bare minimum. In my opinion, neither should markets.
No one should make more money than their effort and sacrifice would justify. Productivity and effort should be totally separated as economic concepts.
There should be no market-distorting totalitarian legal structures with limited liabilities and the powers of immortal people. And no person should be allowed to make a dime of profit as long as there are any starving, thirsty or struggling to get shelter. That is not even a radical point: That is as old as John Locke and the Enlightenment as a point.
Further, no one's profits should be able to get to the point where they can trump democracy or the rights of others.
For all these reasons, and more, corporations should be abolished and we should pursue alternative economic institutions.