On October 17, 2008, SI International, Inc., a Delaware corporation (the "Company") and Serco Group plc, a public limited company organized under the laws of England and Wales ("Serco Group"), issued a press release announcing that in connection with the Agreement and Plan of Merger (the "Merger Agreement"), dated August 26, 2008, by and among the Company, Serco Group, Serco Inc., a New Jersey Corporation and Matador Acquisition Corporation, a Delaware corporation and wholly-owed subsidiary of Serco Inc. (the "Merger Agreement"), the waiting period required under the Hart-Scott Rodino Antitrust Improvement Act of 1976, as amended ("HSR"), expired. The termination or expiration of the HSR waiting period was one of the closing conditions set forth in the Merger Agreement. The merger continues to be subject to, among other conditions, certain other regulatory approvals, as well as the approval of the Company's stockholders. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated by reference herein.

d) Exhibits.

Exhibit No.                                 Description
   99.1        Press release, dated October 17, 2008, issued by SI
               International, Inc. and Serco Group plc.