Overview
Maine business registration runs through the Secretary of State (SOS), specifically its Bureau of Corporations, Elections and Commissions, which keeps the official record of entities formed or registered to do business in the state. Searches and annual reports go through the SOS online system at Maine.gov, though formation itself works differently.
Two things stand out for KYB work. First, the recurring filing is an annual report, due by June 1, a later deadline than the January or April dates most states use. Second, Maine still handles entity formation on paper: the Certificate of Formation and Articles of Incorporation are filed by mail or in person rather than online, even though annual reports can be filed online. That makes formation slower than in fully digital states, and it is worth keeping in mind when tracking newly formed Maine entities.
Maine's formation fees are also on the higher end, with an LLC Certificate of Formation at $175 and corporate Articles of Incorporation at $145.
Maine has no state-level beneficial ownership register. At the federal level, the Corporate Transparency Act (2021) created a BOI registry run by FinCEN, but a March 2025 interim final rule lifted the obligation for all U.S. companies and U.S. persons. Only foreign reporting companies remain subject to it.
For KYB and AML work, the free SOS search returns an entity's status, charter number, registered agent, principal office, and the officers, directors, and managers named in its filings.
Official Registers
Secretary of State (Corporate Name Search)
The SOS Bureau of Corporations maintains the official register through its corporate name search. It records domestic and foreign corporations, LLCs, nonprofit corporations, limited partnerships, and limited liability partnerships.
Search and access. The corporate name search is free and needs no account. Search by entity name or charter number. Each record shows the entity name, charter number, type, status, registration date, registered agent name and address, and the principal information reported in the entity's filings.
Charter number. Maine assigns each entity a charter number at registration, which is the primary identifier across the register and the key most lookups run on. It appears on the Certificate of Formation acknowledgement and on annual report receipts.
Filings. Formation documents are filed by mail or in person; Maine does not offer online formation. A Certificate of Formation for a domestic LLC costs $175. Articles of Incorporation for a domestic corporation cost $145. Nonprofit Articles of Incorporation cost $40. Annual reports, by contrast, can be filed online.
Certificates. Certificates of Existence and certified copies of filed documents are available from the SOS for a fee.
Registration and Publication Requirements
Corporations
All domestic and foreign for-profit corporations must register with the SOS and maintain a registered agent at a Maine address.
Annual report. Corporations file an annual report, due by June 1, with a window that opens January 1. The fee is $85 for domestic corporations and $150 for foreign corporations, and a late report draws a $50 penalty. The report carries the principal office, the registered agent, and the names of the directors and officers, all of which become part of the public record.
Failing to file leads the SOS to administratively dissolve a domestic corporation or revoke a foreign corporation's authority to do business. The entity must then be reinstated to return to good standing.
Financial statements. There is no public financial disclosure requirement.
LLCs
All domestic and foreign LLCs must register with the SOS and maintain a registered agent in Maine. Domestic formation costs $175, filed on paper.
Annual report. LLCs file an annual report, due by June 1, at $85 for domestic and $150 for foreign entities, with the same $50 late penalty. The report confirms the registered agent and principal office and lists the name and address of each manager, where the LLC has managers. A member-managed LLC with no managers lists no individuals beyond the registered agent, and members themselves are not collected. So manager data is on the public record for manager-managed LLCs but thinner for member-managed ones, and it is not a full ownership list either way.
Nonprofit corporations
Nonprofits file Articles of Incorporation with the SOS at $40 and file an annual report each year, due by June 1, at $35. Directors and officers appear on the public record. Federal 501(c) status comes from the IRS; the state filing does not grant it.
Limited partnerships and LLPs
Limited partnerships and limited liability partnerships register with the SOS and maintain a registered agent in Maine. Both file with the SOS to stay in good standing.
Sole proprietors and general partnerships
Sole proprietors and general partnerships do not register as entities with the SOS and do not appear as registered entities in the corporate search.
Summary table
| Entity type | Register with SOS | Annual report | Management data public |
|---|---|---|---|
For-profit corporation | Yes ($145) | Yes ($85 domestic / $150 foreign, by June 1) | Officers and directors |
LLC | Yes ($175) | Yes ($85 domestic / $150 foreign, by June 1) | Managers (if manager-managed); not members |
Nonprofit corporation | Yes ($40) | Yes ($35, by June 1) | Directors and officers |
LP / LLP | Yes | Yes | Partners on file |
Sole proprietor / general partnership | No | No | No |
With Topograph
Topograph queries Maine's Secretary of State system to return structured company data for entities registered in the state.
Available Data
Company Profile
- Maine charter number
- Entity name
- Entity type and state of formation
- Current status
- Registration date
- Registered agent name and address
- Principal office address
Officers and Management
- Officers and directors as reported in the corporation's annual report
- Managers as reported in a manager-managed LLC's annual report; member-managed LLCs list only the registered agent and principal office
Available Documents
| Document type | Comment |
|---|---|
Trade Register Extract | A Topograph-generated extract of the entity's SOS record: charter number, entity name, type, state of formation, status, registered agent, principal office, and the officers and directors most recently reported. |
Financial statements aren't filed publicly in Maine. For LLCs, the public record covers managers where the LLC has them, but not members, so it is not a full ownership list. Domestic companies are also exempt from federal BOI reporting following the March 2025 FinCEN rule.
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