EQT AB (publ) (OM:EQT) is considering a sale of its stake in specialty packaging firm GPA Global amid interest from investors, according to people familiar with the matter. The Stockholm-based buyout firm is working with a financial adviser on the potential deal, the people said, asking not to be identified because the information is private. A transaction could value the packaging business at about $700 million to $800 million, the people said.