Vestar Capital Partners, a middle-market private equity firm, completed the acquisition of Stratus, an asset-light facilities services provider, from Arcapita, a global alternative investments firm, for $451m. "Stratus' significant investments in systems and operational infrastructure, deep understanding of its customers' needs, and relentless focus on service excellence have enabled its growth into a scaled nationwide platform," Nikhil Bhat, Vestar Managing Director and Co-Head of Business & Technology Services.