Today, on Equal Pay Day, it's worth looking at what executives can do to improve the status quo.

Fewer women are aware of how pay is determined at their employer than men are (53 percent, compared to 65 percent), as the majority of companies are still not sharing pay data internally. That's according to a new Glassdoor study called "Global Salary Transparency Study," released Monday evening. 

"Even in 2016, most employees--especially women--remain in the dark about what fair pay is for their particular role. The majority of employees report their companies do not share pay data internally even as most employees believe salary transparency is good for business and employee satisfaction," said Dawn Lyon, the vice president of corporate affairs at Glassdoor.

The company surveyed 4,300 adults--employed part-time or full-time--across seven countries. Of note, the U.S. lags behind other nations when it comes to pay transparency; Just 31 percent of American workers say their company discloses salary information, compared to 50 percent of workers in the Netherlands, and 45 percent in the U.K. and in Canada. 

Pay transparency is a key ingredient in helping women to earn the salaries they deserve, in as much as it gives them a frame of reference when it comes time to negotiate for more money. A handful of major tech companies have committed to reviewing employee pay data internally, including image-sharing website Pinterest, and web hosting service GoDaddy. Salesforce similarly announced in April of last year that it would conduct an audit of all 16,000 of its salaries, with an eye towards making them more fair. 

Gender differences in the Glassdoor research may be attributed to the fact that men think they know more about salaries than women do (without actually having those insights), or to the fact that they may be asking for this data more directly than women are. 

It's not surprising that employers are reticent to share salary data internally, which could cause tension amongst colleagues. "Pay is a very emotional subject. People take it very personally," noted Dave Smith, the chief product officer at PayScale, a compensation software company, in a recent interview with Fortune. "So employers often just don't trust that managers can handle difficult conversations about why someone's pay differs from their peers."

Still, if you want to keep your best talent around, it's worth making the data available. In an October study, PayScale found that most (82 percent) of employees who knew that they were being paid below the market standard said they were nevertheless "satisfied" with their jobs, and planned on staying. 

As it stands now, according to Glassdoor, more than half of all workers globally feel they need to switch companies in order to receive a substantial pay increase.