Mill Rock Packaging Partners LLC has acquired Keystone Paper & Box Co, a specialty packaging company that manufactures custom folding cartons for consumer and healthcare end markets. Terms of the transaction were not disclosed.
Mill Rock Packaging, formed by Mill Rock Capital in 2020, is a specialty packaging company. The transaction marks Mill Rock Packaging’s expansion to the Eastern U.S. and its fourth acquisition.
In connection with the transaction, Keystone’s leadership team has made a significant investment in Mill Rock Packaging. Management will remain with the company.
Keystone, based in South Windsor, Connecticut, and founded in 1944, is a paperboard packaging company; its offerings span a broad range of sustainable, customized folding cartons for food and beverages, pharmaceuticals, health and beauty and other daily-use products.