Me. Rev. Stat. tit. 31, § 7

Sections 1 and 2 do not apply to corporations, limited partnerships or limited liability companies. A corporation desiring to do business under an assumed name shall file a statement as provided in Title 13‑C, section 404. A limited partnership desiring to do business under an assumed name shall file a statement as provided in section 1308, subsection 2. A limited liability company desiring to do business under an assumed name shall file a statement as provided in section 1510.