The four former Mavericks employees allege the team photographer, Danny Bollinger, had propositioned women co-workers and made crude remarks for more than 10 years.
The latest allegations come after owner Mark Cuban had pledged $10 million to women's groups in September, ABC News reports. The Dallas Mavericks had dodged further sanctions in what NBA Commissioner Adam Silver in September described as "disturbing and heartbreaking" accusations of harassment and violence against women staff.
The NBA conducted its own probe seven months after the Sports Illustrated report highlighted Cuban's organization as "a corporate culture rife with misogyny and predatory sexual behavior" that lasted decades.
The NBA issued a statement following a report from an independent law firm that included discussions with 215 current and former Mavericks employees and a review of more than 1.6 million documents, emails and text messages.
"The findings of the independent investigation are disturbing and heartbreaking and no employee in the NBA, or any workplace for that matter, should be subject to the type of working environment described in the report," Silver said. "We appreciate that Mark Cuban reacted swiftly, thoroughly and transparently to the allegations first set forth in Sports Illustrated—including the immediate hiring of Cynthia Marshall as CEO to effect change."
Marshall said in October that the Mavericks were doing their "own internal investigations" following the news about Bollinger, but did not mention him.
The Mavericks hired Marshall, formerly head of HR for AT&T, as its interim CEO earlier in the year, as reported.