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

The letter comes after the GAMCO Investors Inc. chairman filed a books and records request seeking more specifics about the $8 billion merger deal

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

Longtime Paramount Global shareholder Mario Gabelli, who had agitated against iterations of the Skydance-Paramount merger deal, is stepping up his campaign for more transparency around the deal. Lawyers for Gabelli,

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.