Apple builds on its lead as top U.S. smartphone maker; HTC takes biggest dip [chart]

Apple(s AAPL) has padded its lead as the top U.S. smartphone manufacturer in the first quarter of this year, according to comScore data released Thursday. Samsung, the world’s top smartphone manufacturer, also had slight growth in its share of U.S. smartphone subscribers from the final quarter of last year.

All other major manufacturers lost share in a market that includes 133.7 million American smartphone owners. HTC, which Thursday debuted HTC First, a phone that comes pre-installed with Facebook(s FB) custom launcher Facebook Home, had the biggest decline, with its share of smartphone users dropping 1.7 percent. Apple, meanwhile, was up almost 3.9 percentage points.

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