> This way investors can fund the next generation of companies.

This is where I get confused. Say APPL was $100 share, and so many people buy it that it goes up to $200/share. How does this really benefit APPL? They don't ever issue more shares from what I can tell (they don't need to raise capital).

Why does the share price of APPL/AMZN/TSLA matter to them? To attract investors/keep a board of directors happy, sure

But what do they financially gain by their market cap going up?