Private equity firm Kelso & Co. has completed the acquisition of information technology company Sirius Computer Solutions Inc. from Thoma Bravo.

Sirius, based in San Antonio, Texas, and founded in 1980 makes cloud software, IT networking products and software for mobile devices.  The company works with major technology companies including, Cisco Systems Inc. (Nasdaq: CSCO), IBM (NYSE: IBM) and Microsoft Corp. (Nasdaq: MSFT) Thoma Bravo invested in Sirius in 2006 when the target had $600 million in annual revenue. Sirius is expecting to finish 2015 with about $1.7 billion in revenue.

Earlier in 2015, Sirius acquired certain software assets from Avnet Inc. and purchased technology consulting firm Varrow Inc.

Thoma Bravo has been active lately in making deals. Its portfolio company Hyland Software Inc. has acquired LawLogix Group Inc.;  earlier in 2015, Thoma Bravo has closed a deal for MedeAnalytics Inc.;  The PE firm is joining Silver Lake Partners to buy Solarwinds Inc. for $4.5 billion.

Thoma Bravo won Mergers & Acquisitions M&A Mid-Market Deal of the Year award for 2014 for the $930 million purchase of hospitality software TravelClick.

Kirkland & Ellis LLP represented Thoma Bravo and Elder Bray & Bankler PC advised Sirius.

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