How do companies profit from selling shares?

Juliane asks:
I am wondering if-and then how-a corporation continues to make money off its shares sold in the market. More specifically, once initial shares are sold, does a corp. continue to make $ every time the shares are traded? If not, can a corp. offer a new batch of shares any time it needs capital and, if so, is this considered a new IPO (if not, how would an investor know about the new shares)?
I am wondering if-and then how-a corporation continues to make money off its shares sold in the market. More specifically, once initial shares are sold, does a corp. continue to make $ every time the shares are traded? If not, can a corp. offer a new batch of shares any time it needs capital and, if so, is this considered a new IPO (if not, how would an investor know about the new shares)?



























