Chicago private equity firm GTCR has signed an agreement to sell portfolio company Six3 Systems Inc. to CACI International Inc. (NYSE: CACI), a provider of information products and services to government customers, for $820 million.

Six3 provides services aimed at the intelligence community, the U.S. Department of Defense and civilian security agencies. The McLean, Va. company was formed in 2009 by GTCR and Robert Coleman, the former president of ManTech International Mantech International Corp. (Nasdaq: MANT).

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