Cynthia Littleton Business Editor It’s showtime for David Nevins – for him and for the business he helped transform over the past dozen years. Nevins, who announced his resignation Thursday as chairman and CEO of Paramount Premium Group and chief creative officer of Paramount+ Scripted Series, cited the evolution of Showtime’s financial underpinnings as among the highlights of his tenure. Over the past few years, as the streaming revolution in TV has accelerated, Showtime’s business model has shifted from entirely wholesale to MVPDs to a “significant” portion of its total revenue coming direct to consumer. The depth of the change that he helped lead at Showtime and Paramount+ and other parts of Paramount Global were a big part of the reason he decided to make a change in his own career. Nevins will formally exit the Paramount fold at year’s end. As of today, Nevins said he has no specific plans other than to take an extended break from work for the first time in more than 25 years.