Comcast, the parent company of NBCUniversal, is trying to block a proposal by shareholders that could result in an outside investigation into the claims of workplace sexual misconduct and efforts by top officials to hide them.

A resolution filed by the investment firm Arjuna Capital, which Comcast Corporation received at the end of December, seeks an “independent investigation” and a report by the Board of Directors about the “risks posed by the Company’s failures to prevent workplace sexual harassment.”