Ellis & Company 20300 Seneca Meadows Pkwy, Germantown, MD20876 Ellis & Company is an accounting firm based in Germantown. It specializes in individual and corporate taxation…More and accounting. Its services additionally include estate planning, financial planning, payroll, cash flow management and bank financing, among others. Ellis & Company was founded by Michael Ellis , CPA, a graduate of Towson University. It is located in the OBA Bank Building.