WT Microelectronics (TWSE : 3036) today announced its monthly sales for May 2015 totaled NT$9.402 billion, a decrease of 6.05% from April 2015 and an increase of 12.34% over May 2014. Sales for January through May 2015 totaled 47.947 billion, an increase of 19.44% compared to the same period in 2014.