Cardtronics Inc. announced Monday that it plans a secondary stock offering, more than two years after its initial public offering.

The Houston automated teller machine operator plans to sell 6 million shares.

As of Feb. 26 it had 41,615,339 million shares outstanding, according to a filing with the Securities and Exchange Commission.

At the end of 2009 the Cardtronics network had 33,400 ATMs in the U.S., the U.K., Mexico and Puerto Rico.

Cardtronics went public in December of 2007. Its shares were offered then at $10, have dipped as low as $8.33 and were trading at $9.85 midday Monday.

In February the company said that its fourth-quarter revenue had increased 6% year over year, to $124.8 million, and that it swung to a $1.7 million profit from a $58.7 million loss.

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