Anteon Files for Five Day Extension for 10-Q

    Business Editors/Defense Writers

    FAIRFAX, Va.--(BUSINESS WIRE)--May 11, 2005--Anteon International Corporation (NYSE:ANT), a leading information technology and systems engineering and integration company, today announced that it has filed an extension request on Form 12b-25 pertaining to its quarterly report for the period ended March 31, 2005.
    Shortly before the filing deadline for Anteon's Quarterly Report on Form 10-Q for the period ended March 31, 2005, Anteon became aware of certain generalized allegations made by an exiting employee relating to revenue accruals during the third and fourth quarters of 2004 in one of Anteon's business units. In accordance with Anteon's internal procedures, the Company immediately notified Anteon's Audit Committee of these allegations. The Audit Committee has engaged outside advisors to review matters related to these allegations.
    Because these allegations were raised very shortly before the filing deadline for Anteon's Quarterly Report on Form 10-Q for the period ended March 31, 2005, the work related to these matters could not be completed. However, based upon the inquiry to date, Anteon has not identified information that would result in a material change in the previously announced financial results for the quarter and year ended December 31, 2004 and the quarter ended March 31, 2005.
    Assuming there are no new developments on this matter and the Audit Committee completes its review, Anteon currently believes that the Quarterly Report on Form 10-Q for the period ended March 31, 2005 will be filed within the extension period provided by Rule 12b-25(b).

    About Anteon

    Anteon, headquartered in Fairfax, Virginia, is a leading systems integrator, providing information technology and engineering solutions to the federal government and international sectors. Anteon designs, integrates, maintains and upgrades state-of-the-art systems for national defense, intelligence, emergency response and other high priority government missions. Anteon also provides many of its government clients with the systems analysis, integration and program management skills necessary to manage the development and operations of their mission critical systems. The Company was founded in 1976 and has grown to currently employ over 9,100 employees in more than 100 offices worldwide. Anteon consistently ranks among the top information technology integrators based on independent surveys, and has been named to the Forbes List of the 400 Best Big Companies in 2005, earning distinction on the Forbes Platinum List. For more information, visit www.anteon.com.

    Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995:

    The statements contained in this release which are not historical facts are forward-looking statements that are subject to risks and uncertainties that could cause actual results to differ materially from those set forth in, or implied by, forward-looking statements. The Company has tried, whenever possible, to identify these forward-looking statements using words such as "projects," "anticipates," "believes," "estimates," "expects," "plans," "intends," and similar expressions. Similarly, statements herein that describe the Company's business strategy, outlook, objectives, plans, intentions or goals are also forward-looking statements. The risks and uncertainties involving forward- looking statements include the Company's dependence on continued funding of U.S. government programs, government contract procurement and termination risks, including risks associated with bid protests, and other risks described in the Company's Securities and Exchange Commission filings. These statements reflect the Company's current beliefs and are based upon information currently available to it. Be advised that developments subsequent to this release are likely to cause these statements to become outdated with the passage of time. The Company does not currently intend, however, to update the guidance provided today prior to its next earnings release.

--30--RB/ph*

CONTACT: Anteon International Corporation Press: Mark Meudt, 703-246-0525 mmeudt@anteon.com or Investors: Dennis Kelly, 703-246-0318 dkelly@anteon.com

KEYWORD: VIRGINIA DISTRICT OF COLUMBIA INDUSTRY KEYWORD: BANKING AEROSPACE/DEFENSE GOVERNMENT SOURCE: Anteon International Corporation

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