 Kista is the largest corporate area in Sweden and important to the national economy.The construction of the industrial section of Kista began in the 1970s with companies such as SRA (Svenska Radioaktiebolaget, now a part of Ericsson), RIFA AB (later Ericsson Components AB, and later still Ericsson Microelectronics AB, and now Infineon Technologies), and IBM Svenska AB (the Swedish branch of IBM).Ericsson has had its headquarters in Kista since 2003.