EQT VI will acquire 100 percent of UC4 from Carlyle Europe Technology Partners and founder Franz Beranek, EQT said in a separate statement.
Carlyle Europe Technology Partners had bought UC4 in March 2006 as a platform for industry consolidation in the IT process automation sector.
UC4 has a client base of more than 2,000 customers and generated revenue of about 62 million euros ($76.58 million) in the year ended April 2012.
Further details of the deal, which is expected to close in the fourth quarter, were not disclosed.
Carlyle Group shares were up 2 percent at $24.17 in afternoon trade on Monday on the Nasdaq.
($1 = 0.8096 euros)
(Reporting by Aman Shah in Bangalore; Editing by Supriya Kurane)
Image Credit: Carlyle co-founder David Rubenstein. Photo by Fred Prouser, Reuters