Executives at the casino operator Wynn Resorts helped hide sexual misconduct allegations against the company’s billionaire founder, Steve Wynn, the Massachusetts gambling regulator said Tuesday.

The finding was included in a report released by the regulator, the Massachusetts Gaming Commission, as it began a three-day hearing on whether to allow Wynn Resorts to start operating a $2.6 billion resort near Boston in June as planned.

High-ranking company executives knew about the allegations but did not follow company policy — including a zero-tolerance rule against sexual harassment in place since 2004 — and initiate an investigation, according to the report. The executives also failed to report the allegations either to the full Wynn Resorts board or to the board’s audit and compliance committees, the commission found.

“In some instances, particular company executives, with the assistance of outside counsel, were part of affirmative efforts to conceal allegations against Mr. Wynn that came to their attention,” the report states.