Arjuna Capital managing partner Natasha Lamb has convinced 21 companies to commit to analyzing and closing their gender pay gaps. These include major players in tech (Apple, Intel, Microsoft), finance (J.P. Morgan Chase, Bank of America, Mastercard), and retail (Amazon, Nike, Starbucks). In honor of Equal Pay Day 2018, Fortune sat down with the activist investor to talk about how—and why—she engages with companies on the issue of pay equity. The interview below has been edited and condensed for clarity.
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