USA – Mill Rock Packaging Partners, a portfolio company of Mill Rock Capital, has acquired specialty packaging company Keystone Paper & Box Company for an undisclosed sum.

Based in South Windsor, Connecticut, Keystone provides design-intensive packaging, engineering, prototyping and production-related services.

The company operates an advanced production facility that manufactures a range of sustainable, customized folding cartons for household goods, food and beverages, pharmaceuticals, health and beauty and other sectors.

The acquisition of Keystone is Mill Rock Packaging’s fourth to date and is intended to expand the company’s presence in the Eastern US.

As part of the deal, Keystone’s leadership team has made an undisclosed amount of investment in Mill Rock Packaging. The company’s management will remain on board.

The merged entity will operate a total of six production facilities, which will produce sustainable paperboard packaging for consumer markets.

Mill Rock Packaging vice-chairman and Mill Rock Capital senior partner Bob Feeser said: “This is a highly strategic transaction that enables us to serve our customers from coast to coast, fulfilling Mill Rock’s initial vision to create a national consumer packaging powerhouse.

“We are excited to work with the Keystone team to advance our vision of a unified, national, specialty packaging growth platform.”

Keystone president Jim Rutt added: “Through our partnership with Mill Rock Packaging, our customers will gain access to high-quality production facilities in the Midwest and West Coast.

“I am delighted that Mill Rock Packaging shares our commitment to quality, integrity and service, and I look forward to future growth leveraging our combined resources.”

Alvarez & Marsal, White & Case and FINNEA Group acted as advisers to Mill Rock Packaging for this deal.

Formed in 2020, Mill Rock Packaging invests in developing consumer packaging businesses with ‘advanced’ service and product capabilities.

Meanwhile, in July last year, the company acquired US-based specialty packaging and printing company Impressions.

Impressions specializes in designing, engineering and producing high-end paperboard packaging and commercial printing products for various end markets.

The company’s core offering spans a broad range of high-end, eco-friendly, customized folding cartons for consumer staples, pharmaceuticals, health and beauty and other daily-use products.

Impressions offer lithographic printing and a host of value-added services, including product engineering, prototyping and post-print production.

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