About The Miller Group The Miller Group refers to The Miller Group - Multiplex Division, a retail display manufacturer with operations spanning Dupo, Illinois and Richmond, Virginia As a result of the cyberattack, the company lost control of 500 GB of confidential data, including: employees’ Social Security numbers, email addresses, home addresses, and ZIP codes—plain Excel spreadsheets; financial documents in PDF format—budgets, transactions, and internal reports; complete project drawings—working diagrams and perspective sketches.