More than 100 companies made the cut for the Inc. 5000 fastest-growing private companies in America list, with two local companies named among the 50 fastest-growing ones in the nation. Miami-based car-dealership marketing firm Showroom Logic came in at No. 26 nationally, topping the magazine’s list of South Florida companies by increasing revenue to $13.4 million in 2013 from $157,259 three years before. IQ Formulations, a nutritional supplement company, ranked No.