This year, for the first time, businesses in the U.K.—including a number of U.S.-based and global law firms—must disclose pay disparities between their male and female employees. Some law firms are even releasing details about the pay gap among their U.K. partners, going above and beyond the regulatory requirements in the name of transparency and social progress.

But anyone expecting that spirit of transparency to cross the Atlantic, in the form of firmwide or U.S. pay gap disclosures, may be in for a long wait.