A report from US firm Strategy Analytics said that while Qualcomm still had a 64 percent lead in the third quarter of 2014, its lead is being eaten into by Mediatek.
Mediatek has 17 percent share of the top five baseband revenues, followed by Spreatrum with six percent revenue share.
Qualcomm did have 85 percent share in the LTE baseband market but that fell to less than 80 percent in the period, mostly due to incursions from the Chinese company.
Mediatek overtook Marvell and Strategy Analytics believe it is set to continue its growth in LTE.
During the quarter, HiSilicon, Intel and Marvell made progress in the marketplace. Intel won some major design wins with Samsung.