Well, that is a glitch

Looks like there is an upper limit to the amount of money you can make in GTA V. Because Michael should have near $3 billon. Trevor and Franklin should be around $2.3 and $2.4 billion, respectively. Stock market manipulation is fun and profitable.

This was a max money playthrough- I spent the smallest amount of cash as possible this run. I did pimp whatever weapons I had, and a few cars. It is really a waste to do the stock market missions past the $1.5 billion mark.

I may go back a save and stash 1/2 of the cash in a different stock before pulling the remainder out. Or just blow some shit up...