Maine Form BD is a series of state forms used to register, register changes to, or terminate a business entity in the state of Maine. It allows businesses to file for registration or other changes such as amendments to their Articles of Incorporation or merger agreements. There are three types of Maine Form BD: Form BD-1, Form BD-2, and Form BD-3. Form BD-1 is the initial registration form for business entities registered in Maine; Form BD-2 is used to amend the Articles of Incorporation or merger agreements; and Form BD-3 is used to terminate a business entity registered in Maine.