More information can be found at Deloitte's website, in this Swedish article:
About Deloitte Sweden Technology Fast 50 and Rising Stars
The only cross-industry ranking of technology companies in Sweden. The award is now in its eleventh year. The ranking includes public and private companies, large and small, in all areas of technology, from Internet specialists to life sciences, green tech, computers to semiconductors and software to telecommunications. Growth is based on revenue growth over the last five years according to annual reports reported to Bolagsverket per 31 July. For Fast 50 the growth is measured during 2009-2013, and for Rising Stars during 2011-2013. Please find more detailed information (in Swedish) on www.deloitte.se/fast50.