Sometimes it's worse than that -- women are seen as a cheap ticket.
I remember one of my first colleagues as a professional in this industry had to fight and fight to eke out a lousy 3% raise, despite being s superstar employee.
Later I found out that she was making 30% less than me, and They had just threw a ton of equity at me to try and keep me from leaving.
This is pretty unfortunate. But we don't know if the company would have done the same for a male.
We don't know for sure about this instance, but evidence suggests that it's more likely to happen to a woman than a man - https://www.cfa.harvard.edu/cfawis/bowles.pdf
A friend recently had an offer, ready to sign, but the salary was lower than she wanted. She wrote back asking if there was room to move upward. She had the offer withdrawn.