Board Converting News, October 19, 2026

Key Container (CONT’D FROM PAGE 1)

said David Strauss, President of Key Container. “Altamont’s proven growth playbooks and experts within their network will strengthen existing operations, enable new customer relationships and future expansion, and support our goal of providing our customers with the whole package.” “Over the past six decades, Key Container has estab- lished itself as a regional manufacturing leader,” said Bil- ly Medof, Operating Partner at Altamont. “Ever-changing customer needs require that packaging suppliers stay nimble, capable, reliable, and customer-first. We believe Key Container, with its top-notch facilities, operations, and customer service, is well-positioned in today’s evolving market, and we’re excited to work in lockstep with David and the team to support the company’s transformation and growth.” “As a family-run company with stellar fundamentals op- erating in an industry with stable and attractive long-term growth, Key Container is precisely the kind of opportuni- ty that we see as having terrific potential to scale,” said Chase Beeler, Managing Director at Altamont. “We’re con- fident that our industry experience and Altamont Ascend, our system for strategic platform building, will build on Key Container’s strengths to unlock the company’s full poten- tial.” Giving Back The beating heart of altruism pumps throughout Key Container and everything it does. It’s built around a strong

Massachusetts, to more effectively service its clients locat- ed in the Western region of the state. In 2019, Custom, which merged with the Miller Box in 2008, moved to its current 300,000-square-foot facility in Pawtucket, Rhode Island. This larger facility enabled Key to store additional stock and automate various job func- tions through modern technologies.

Just last year, Custom acquired Grimes Box, which ex- panded its packaging supply options and improved its Just-In-Time Warehouse and Vendor Managed Inventory (VMI) programs. The company named was subsequently renamed to Custom & Grimes Box. “We are excited to partner with Altamont as we contin- ue to support our customers with their packaging needs,”

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18 October 19, 2026

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