New Hampshire Form TN-1 is a Trade Name Registration. This form is used to register a trade name for a business that is conducted within the state of New Hampshire. With this registration, business owners can protect their trade name and ensure that others cannot use the same name without permission. The form must be filed with the Secretary of State and is valid for five years. There are two types of New Hampshire Form TN-1 Trade Name Registration: the Initial Trade Name Registration and the Renewal Trade Name Registration. The Initial Trade Name Registration is used to register a new trade name, while the Renewal Trade Name Registration is used to renew an existing trade name registration.