Wynn Resorts Ltd. WYNN 0.45% added three women to its board as the company continues to manage the fallout from sexual-misconduct allegations against former Chief Executive Steve Wynn. Disclosed on Wednesday, the move came a day after the casino operator’s largest shareholder, Mr. Wynn’s ex-wife Elaine Wynn, demanded the board overhaul its membership to comprise mostly new directors. The new independent directors are Betsy Atkins, Dee Dee Myers and Wendy Webb, bringing the board’s current composition to four women and seven men. The company said the board approved the new directors at a meeting in Las Vegas on Tuesday.