More than 100 employers have now joined Boston’s pledge to make pay more equitable for men and women in the city.

Mayor Marty Walsh announced the milestone on Monday, encouraging more local businesses to sign “100% Talent: The Boston Women’s Compact,” which city leaders have called a first-of-its-kind effort to close the gender gap on wages by recruiting companies to the cause.

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Among those new to the initiative are the Greater Boston Chamber of Commerce, joining colleges, hospitals, retailers, utility companies and others already on the list.

The compact, launched in 2013, asks businesses to do three things: understand what causes disparity in pay for men and women, assess pay among their employees and correct inequities, and conduct regular reviews of how workers are paid.

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Participating businesses also share data with the city’s Women’s Workforce Council.

Women in Boston earn 83 percent of what men do, according to research that compared the salaries of female residents who worked full-time in 2011.

The same report also found the disparity is greater for women of color. Black women earned 56 cents for every dollar white men earned in 2011, and for Hispanic and Latina women that figure is 44 cents for every dollar, the report found.