NEW YORK (CNN/Money) - Anteon International Corp., which offers information technology services to the United States government, came in above expectations when it raised $270 million late Monday.

Fairfax, Va.-based Anteon sold 15 million shares at $18 each via lead underwriter Goldman Sachs. The company had planned to sell 12.5 million shares at $17-to-$18 each.

Anteon provides systems engineering services primarily to the defense community. The company's provides technology that allows clients to manage their mission systems, which include ships, aircraft, weapons and communications.

The company, the third defense/information technology IPO this year, will trade under the symbol ANT on the New York Stock Exchange Tuesday.