On January 7, 1983, Viacom International added itself as a partner and drafted an amendment to the proposal to consolidate The Movie Channel with Showtime. Under the revised proposal, the four studios would each own a 22.58% stake in the two networks, with American Express owning a 9.68% minority interest. In addition, the consortium would appoint a management team separate from those employed by the two channels – which would continue to operate as separate services – to operate the joint venture. However, the deal ran into regulatory hurdles since Warner, Universal and Paramount received 50% of their respective total revenue from film releases and licensing fees from premium services; furthermore, Showtime and TMC combined would control about 30% of the pay cable marketplace, creating an oligopoly with HBO (which, in conjunction with Cinemax, controlled 60% of the market).