Deerfield( Illinois): The departure of Walgreens Boots Alliance Inc’s chief executive officer( CEO) will leave the SP 500 with no black female CEOs, underscoring the slow path of progress for diversity in America’s C-suite.... The stock has lost half its value since her arrival. Before Brewer arrived at Deerfield, Illinois-based Walgreens, there hadn’t been a black woman at the helm of an SP 500 company in the five years since Ursula Burns left Xerox Holdings Corp in 2016.... Prior to that tra