Mario Gabelli still has not decided whether he'll mount a legal challenge to Skydance Media's merger with Paramount Global.

Longtime Paramount Global shareholder Mario Gabelli is stepping up his campaign for more transparency around the company's merger deal with Skydance.

The FCC filing follows legal maneuvering from Mario Gabelli, the largest holder of nonvoting shares, seeking access to Paramount's books.

Famed money manager Mario Gabelli, one of the largest shareholders in Paramount Global, urged the Federal Communications Commission to halt its review of the transfer of broadcast licenses in the media giant’s $8 billion merger with Skydance.