Research firm IDC says there were 49.2 million tablet computers shipped during the first three months of the year, more than double the 20.3 million a year earlier. Here are IDC's figures for worldwide tablet unit shipments and market share in the first quarter of 2013.
— Apple Inc., 19.5 million units, 39.6 percent share (58.1 percent share a year earlier, 65.3 percent increase)
— Samsung Electronics Co., 8.8 million units, 17.9 percent share (11.3 percent share a year earlier, nearly fourfold increase)
— AsusTek Computer Inc., 2.7 million units, 5.5 percent share (3.1 percent share a year earlier, 4.5 times)
— Amazon.com Inc., 1.8 million units, 3.7 percent share (3.6 percent share a year earlier, 2.5 times)
— Microsoft Corp., 900,000 units, 1.8 percent share. Microsoft did not sell the Surface tablet a year earlier.
— Other, 15.5 million units, 31.5 percent share (24.1 percent share a year earlier, more than triple)