Company continues nationwide expansion to deliver innovative, secure opening solutions

WINSTON-SALEM, N.C., April 1, 2026 /PRNewswire/ — The Cook & Boardman Group LLC (“Cook & Boardman” or “C&B”), the nation’s leading provider of fully integrated access and security solutions, has announced its subsidiary’s acquisition of substantially all of the assets of Assurance Media LLC (“Assurance Media”). Assurance Media is headquartered in Wilmington, DE. Terms of the transaction were not disclosed.

Founded in 2009, Assurance Media is a systems integrator focused on structured cabling, A/V systems, and premise security, proudly serving customers in Delaware and Pennsylvania.

“We are excited to welcome Assurance Media to the Cook & Boardman family. Over the years, Assurance Media has earned a strong reputation across Delaware and the nearby areas, built on outstanding customer service and a solutions-driven approach. We look forward to partnering with Mark, Jennifer, and the entire Assurance Media team to grow and achieve new milestones together,” said David Eisner, Chief Executive Officer of C&B.

“Assurance Media has always focused on being a trusted partner to our design and construction clients, providing innovative solutions backed by exceptional service. We are excited to join C&B as we broaden our reach and bring that same expertise and commitment to a wider group of customers. This next chapter allows us to build on our strong foundation while creating new opportunities for continued growth,” said Mark Stellini, former owner and future General Manager of Assurance Media.

The business will continue to operate under the Assurance Media name and customer contacts will remain unchanged as a result of the acquisition.

Platinum Equity acquired a majority interest in Cook & Boardman in 2023. Littlejohn & Co., LLC remains a significant minority shareholder. Assurance Media represents C&B’s seventeenth acquisition under Platinum Equity’s ownership.

K&L Gates LLP served as legal advisor to Cook and Boardman.

About Cook & Boardman Group

Founded in 1955, the Cook & Boardman Group is a family of companies that together represent the nation’s premier provider of fully integrated access and security solutions. Through leveraging the entire Cook & Boardman network, the Company is able to seamlessly provide customers with a broad product and service offering spanning commercial doors, frames & hardware (Division 8), electronic access control equipment and specialty (Division 10) products. C&B also provides full systems integration services including physical security, access control, wireless networking, low voltage cabling, audio/visual and managed information technology products (Division 27 & 28).

The nationwide footprint includes over 80 locations in addition to an online customer shopping portal available on the main website and via eProcurement integrations. Our teams have extensive experience serving the non-residential and commercial properties including healthcare, hospitality, K-12 school, higher education institutions, federal/government properties, industrial/warehouse facilities, multi-family/mixed use properties. Learn more at www.cookandboardman.com.

About Platinum Equity

Founded in 1995 by Tom Gores, Platinum Equity is a global investment firm with approximately $47 billion of assets under management and a portfolio of approximately 50 operating companies that serve customers around the world. Platinum Equity specializes in mergers, acquisitions and operations – a trademarked strategy it calls M&A&O^® – acquiring and operating companies in a broad range of business markets, including manufacturing, distribution, transportation and logistics, equipment rental, metals services, media and entertainment, technology, telecommunications and other industries. Over the past 28 years Platinum Equity has completed more than 450 acquisitions.

About Littlejohn & Co., LLC:

Littlejohn & Co. is a Greenwich, Connecticut-based investment firm focused on private equity and debt investments primarily in growing middle-market industrial and services companies that can benefit from Littlejohn’s 25+ years of operational and sector expertise. With approximately $8 billion in regulatory assets under management, the firm seeks to build sustainable success for its portfolio companies through a disciplined approach to engineering change. For more information about Littlejohn, visit www.littlejohnllc.com.

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