Six3 Systems, which supports the U.S. national security community in areas such as cyber and signals intelligence, was purchased for $820 million, subject to working capital, CACI said.
"CACI's acquisition of Six3 Systems Inc. is compelling on many levels," said Ken Asbury, CACI president and chief executive officer. "The acquisition is consistent with our three-part growth strategy to win new business, drive operational excellence, and continue our successful mergers and acquisitions program as the first priority for the deployment of our capital.
"Six3 Systems is a financially accretive acquisition that further differentiates CACI in our markets and complements our focus on national security. Our combined capabilities will add significant value to our customers' vital missions, help drive our growth, and deliver positive shareholder returns."
Six3 Systems, which is headquartered in Virginia, employs about 1,600 people around the world. Its calendar year 2013 revenue is expected to be about $470 million.
The transaction is expected to be at least 5 percent accretive to CACI's GAAP earnings per share in calendar year 2014 and at least 10 percent accretive to diluted adjusted earnings per share, CACI said.