Littlejohn backed-Cook & Boardman, a distributor of commercial doors, frames & hardware, electronic access control equipment and specialty products, completed the acquisition of Electronic System Group, a security and systems integrator focused on delivering complex electronic access. Financial terms were not disclosed. "We are thrilled to welcome ESG to the Cook & Boardman family of companies. They have a well-earned reputation as a security solutions provider and fit perfectly into our strategy of offering nationwide security integration services. We look forward to leveraging ESG's expertise in providing security solutions that protect our nation's critical energy infrastructure across the broader C&B organization," Darrin Anderson, C&B CEO.