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For the three months ending in May, Samsung Electronics gained 0.8% of the U.S. smartphone market and Apple Inc. (NASDAQ: AAPL) added 0.6%. Apple continues to hold the market share lead in the United States, with 41.9% of the market to Samsung’s 27.8%. The comparisons are made to market share at the end of February.

Rounding out the top five smartphone makers are LG Electronics with a 6.5% share, down 0.3% compared with February; Motorola with a 6.3% share, unchanged since February; and HTC Corp. with 5.1% share, down 0.3%.

The data come from the latest report on the U.S. smartphone market from comScore.

On the operating system (platform) front, Apple gained 0.6% share in the three-month period to post a total of 41.9% of the platform market. Google Inc.’s (NASDAQ: GOOG) Android platform was unchanged during the period, and it continues to hold over half the platform market, with a 52.1% share. BlackBerry Ltd. (NASDAQ: BBRY) dropped 0.6% to post a 2.3% share, while Microsoft Corp. (NASDAQ: MSFT) remained unchanged with a 3.4% share.

The top five mobile apps in the comScore survey were Facebook Inc. (NASDAQ: FB), Google Play, YouTube, Google Search and Pandora Media Inc. (NYSE: P). Facebook’s social media app reaches 76.4% of all mobile users who are at least 18 years old. Google Play’s reach is 51.8%, YouTube reaches 51.7%, Google Search reaches 49.2% and Pandora’s streaming music app reaches 47.6%. Twitter Inc.’s (NYSE: TWTR) social media app ranks 13th with a reach of 23%.

comScore reported that 169 million people in the United States now own smartphones, for a market penetration of 70%. That is a rise of 4% since February. More than two-thirds of all smartphone sales in the United States are made by Apple and Samsung, and Android dominates the platform market.

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