With just two smartphone models available for sale, Apple still managed to top comScore’s list of smartphone OEMs in the three-month period ending May 2011. Following this morning’s report that Microsoft’s share of the U.S. smartphone OS market has slid 35% since the launch of Windows Phone 7, more data from comScore’s most recent MobiLens report has been shared on the firm’s mobile blog. In this quick tidbit, the market research company notes that 76.8 million people in the U.S. owned smartphones during the three months ending in May of this year. Over that period of time, Apple was the No. 1 smartphone vendor with 26.6% of the market, despite the fact that the company sells just two phones: the iPhone 4 and the iPhone 3GS. At 24.7%, RIM found itself second on the list, followed by HTC with 11.8% of the U.S. market. Motorola and Samsung rounded out the top-10 with 11.4% and 8.9%, respectively. Falling below the “other” category which sat in the No. 6 spot were LG with 4.8% of the U.S. market, HP with 2.7%, Nokia with 2.1%, Kyocera with 0.4% and finally Sony Ericsson with 0.2%.