Top 5 makers of tablets, led by Apple; Samsung 2nd

On Thursday, Samsung Electronics Co. will start selling the Galaxy Note 10.1 in the U.S. in its latest effort to compete with Apple's dominant iPad. The Note will have a digital pen and a faster processor at the same price tag as the iPad.

Apple had extended its dominance in tablet computers in the second quarter, shipping nearly seven out of every 10 tablets, according to research firm IHS iSuppli. A new model came out a few weeks before the April-June quarter began. Google's challenger, the Nexus 7, didn't start shipping until the third quarter. Sales of the Note will also be reflected in the third quarter.

Apple's 69.6 percent share in the April-June quarter is up from about 58 percent in the first quarter. It's the highest since the first quarter of last year, when Apple had 70 percent in a market with fewer competitors then.

Here are the top five manufacturers of tablets in the second quarter, as released by IHS iSuppli on Tuesday:

Apple Inc., maker of the iPad, 17 million shipped worldwide, 69.6 percent share

Samsung Electronics Co., maker of Galaxy line, 2.3 million, 9.2 percent.

Amazon.com Inc., maker of Kindle Fire, 1 million, 4.2 percent

AsusTek Computer Inc., maker of Transformer line, 688,000, 2.8 percent

Barnes & Noble Inc., maker of Nook Tablet, 459,000, 1.9 percent

Other, 3 million, 12.3 percent

Source: IHS iSuppli