CenterGate Capital, a private equity firm, completed an investment in United Envelope, a printing and manufacturing company. Financial terms were not disclosed. “We are proud of the success that United Envelope has achieved in becoming a world-class envelope manufacturer over our 89-year history. We are excited about our partnership with CenterGate and believe CenterGate will provide the resources and capabilities necessary to continue the Company’s growth, expand our capabilities, and maintain our relentless focus on serving our customers,” Ken Bernstein, United Envelope President and CEO.