* Anteon International, a Fairfax information technology and systems engineering company, won a five-year, $120 million contract from the Naval Sea Systems Command to support the Program Executive Office for Integrated Warfare Systems. Anteon will provide expertise in systems acquisition, business and financial management, configuration management and lifetime support for joint, Navy and international combat systems.

* NII Holdings, a Reston company that provides mobile communications to business customers in Latin America, announced termination of the planned sale by Nextel Communications of 6.2 million shares of NII common stock. Nextel Communications owns 18 percent of NII Holdings common stock. NII Holdings terminated the sale after discovering that income at its Nextel Mexico subsidiary had been understated by a total of $9 million during fiscal 2002 and 2003 and during the first eight months of fiscal 2004. Shares of NII closed up 61 cents at $41.89.

* Halifax, an Alexandria enterprise maintenance company, acquired AlphaNational Technology Services, a hardware maintenance services company based in Fort Worth, for $1.9 million in stock, cash and notes. The purchase price excludes an additional $150,000 that could be paid over the next 12 months if certain financial targets are met. Shares of Halifax closed unchanged at $5.09.

* Tier Technologies, a Reston transaction processing and packaged software company, said it will invest $3.5 million in CPAS Systems, a Toronto company that makes pension administration software. In exchange for the cash investment, Tier will acquire 45 percent of CPAS's common stock and assume two seats on its board. Shares of Tier closed down 21 cents at $9.76.

Compiled from reports by Washington Post staff writers.