As the global smartphone Applications Processor (AP) market declined 5 per cent (year-over-year) to reach $20.2 billion in 2017, Qualcomm was the leader with 42 per cent revenue share, a new report said on Tuesday. According to market research firm Strategy Analytics, Qualcomm, Apple, MediaTek, Samsung LSI and HiSilicon captured the top-five revenue share spots in 2017.