I don't think Spreadtrum and RDA were in any real sense leaders. Spreadtrum made money in GSM when that was going away. They also had a niche in TDSCDMA, which

I don't think Spreadtrum and RDA were in any real sense leaders. Spreadtrum made money in GSM when that was going away. They also had a niche in TDSCDMA, which was forced upon China Mobile as a homebrew standards and from which China Mobile wanted to get out as soon as they could. RDA were more diversified in their mixed signal offerings, but their revenue peaked in 2012, and already declined significantly in 2013 when they were acquired.