Hear me out
Just saw the movie limitless. The character takes a pill which makes him a genius and he instantly becomes a pro at stock trading. He notices details from just analysing merger details and stuff.
If someone has higher iq they will probably do much better at stocks right?

I don't think so. Someone with high iq might have a huge bias. It's been shown that people with high iq often overestimate their ability to know things.