New Hampshire Form C-4 is a form used by foreign corporations to convert into a New Hampshire Limited Liability Company (LLC). This form is used to register the conversion with the New Hampshire Secretary of State. It must be signed by a corporate officer or director and filed with the Business Division of the Secretary of State. There are two types of Form C-4: Certificate of Conversion and Articles of Conversion. The Certificate of Conversion is used to convert a foreign corporation into an LLC in New Hampshire, while the Articles of Conversion is used to convert an existing LLC from another state into a New Hampshire LLC. Both forms require the filing of a Statement of Conversion and a Certificate of Authorization.