OSHKOSH, Wis., Sept. 29, 2026 /PRNewswire/ -- AGS American Glass Services ("AGS" or the "Company"), a portfolio company of The Sterling Group Foundation Fund ("Sterling"), has completed the acquisition of Mark Industries ("Mark"), a commercial glazing contractor based in Elgin, IL.

Mark Industries provides fabrication and installation of commercial glass systems for warehouse, office, retail, and other building types throughout the greater Chicago area. With in-house fabrication capabilities and a reputation for high-quality project execution, Mark brings a tenured glazier workforce and long-standing customer relationships in its local market. Josh Cunningham, Mark's owner and President, joined the AGS platform following closing and will continue to lead the business.

The acquisition extends AGS's footprint into the Chicago metropolitan market and places Mark in close proximity to AGS's East Moline operations, creating opportunities to better serve customers across northern Illinois.

Sterling launched AGS in July 2025 through its investment in Omni Glass & Paint and East Moline Glass, two long-standing Midwest glazing businesses that serve as the platform's core operating companies, with the goal of building a market-leading commercial glazing and coatings platform across the Midwest. Since then, AGS has invested in platform infrastructure and a suite of centralized services to support operations. With the addition of Mark, we believe AGS is one of the largest glazing contractors in the Midwest and ranks among the top glazing platforms in the United States by revenue. The Company continues to pursue acquisition opportunities in both existing and new markets.

About AGS American Glass Services

AGS American Glass Services, headquartered in Oshkosh, Wisconsin, is a leading provider of custom glass and coating solutions to customers across the Midwest and one of the largest commercial glazing companies in the United States. Launched in July 2025 with Omni Glass & Paint and East Moline Glass as its core operating businesses, AGS also includes Arrow Glass, Elite Glass & Metal, Cedar Rapids Glass Company, and Mark Industries. The Company provides commercial glass installation, paint and coating services, tempered glass distribution, and glass products for specialty vehicles, with in-house fabrication and coatings capabilities that support scalable growth. AGS now has approximately 500 employees across 10 locations and draws on more than 65 years of operating history. For more information, please visit www.agsglassgroup.com.

About The Sterling Group

Founded in 1982, The Sterling Group is a private equity and private credit investment firm that targets investments in basic manufacturing, distribution, and industrial services companies. Typical enterprise values of these companies at initial formation range from $100 million to $1 billion. Sterling has sponsored the buyout of 78 platform companies and numerous add-on acquisitions for a total transaction value of over $27 billion. Sterling currently has approximately $9 billion of assets under management. For further information, please visit www.sterling-group.com.

Past performance is no guarantee of future results and all investments are subject to loss. Represents Sterling's opinions, beliefs, and assessments. Although Sterling believes these assessments are reasonable, they are inherently subjective in nature.

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SOURCE AGS American Glass Services