The Obama-era pay data collection requirement aims to tackle employer discrimination against women and minorities.
Note: Companies forced to report this information have more equal pay. A study looking at a British survey found that making pay practices transparent raised all employees’ wages. And gender wage gaps are far smaller in both unionized workplaces and the public sector, where pay scales are usually available to anyone.
Equal Pay Day is April 2, 2019. https://www.pay-equity.org/day.html