Samsung Electronics Co., maker of Galaxy line, 6.1 million, 9 percent.
Amazon.com Inc., maker of Kindle Fire, 3.9 million, 6 percent
Barnes & Noble, maker of Nook products, 3.3 million, 5 percent
AsusTek Computer Inc., maker of Transformer line, 2.1 million, 3 percent
Other, 9.4 million, 14 percent
Source: IHS iSuppli