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Laurene Powell Jobs, a billionaire philanthropist, entrepreneur and president of the Emerson Collective, is buying a significant stake in Monumental Sports & Entertainment, a sprawling $2.5 billion complex that includes the NBA Wizards, NHL Capitals and Capital One Arena, people familiar with the deal said.

Powell Jobs’s investment, estimated to be worth hundreds of millions of dollars, will give her the second-largest stake — about 20 percent — in Monumental, the 19-member, Ted Leonsis-led holding company that is one of Washington’s highest-profile enterprises, the people said, speaking on condition of anonymity because the deal has not been approved by the NBA and NHL.

Through her sizable investment, Powell Jobs instantly commands an influential position in the male-dominated ownership circles of the “Big Four” professional sports leagues. Very few women’s names stand atop the ownership list of the NBA’s 30 franchises: Jeanie Buss of the Los Angeles Lakers, Ann Walton Kroenke of the Denver Nuggets and Gail Miller of the Utah Jazz.