Cardtronics Inc.'s first-quarter net income rose 55%, to $6.5 million, from a year earlier.

Revenue rose 8%, to $138 million. The Houston ATM independent sales organization attributed the results in part to the addition of 250 machines to its existing base. It also reached deals to deploy about 600 automated teller machines nationwide.

"We kicked off 2011 with a continuation of the positive revenue and earnings trends seen over the past few years," Steve Rathgaber, Cardtronics' chief executive, said in an April 28 press release. "We won new contracts in the quarter and continued to grow our existing premier merchant account base."

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