Apple hopped onto the top five list over ASUS by selling 4,982 units in the third quarter, for a market share of 6.3 percent.
The maker of the iMac, MacBook Pro and MacBook Air saw year-over-year growth of 8.9 percent after selling nearly 5 million units during the quarter.
Apple's price cuts to the MacBook and iMac lines helped increase demand in mature markets, according to IDC.
Apple sold 2.2 million units in the U.S. during the third quarter, for 13 percent of the U.S. market share. This was good for a 9.3 percent year-over-year growth.
Apple is expected to announce a new iMac at an event Thursday.