New Hampshire Form TN-5 Trade Name Addition in Partnership is a legal document that is used in the state of New Hampshire to add a trade name to an existing partnership. This form is used to update the records of the Secretary of State’s Office and should be filed anytime a partnership wishes to add or change a trade name. There are three types of New Hampshire Form TN-5: Trade Name Addition in a New Partnership, Trade Name Addition in an Existing Partnership, and Trade Name Amendment in an Existing Partnership. All forms must be filed with the New Hampshire Secretary of State’s Office.