Twelve Maine-based companies made the annual Inc. 5000 fastest-growing private companies list. The compilation, which recognizes companies’ growth over a three-year period, was released Wednesday by the business magazine. Companies self-report their three-year growth rates and revenue to be considered. In 2016, eight Maine companies made the list and nine did in 2015. Among the Maine companies listed this year, SaviLinx in Brunswick was ranked the highest at No.