Neb. Rev. Stat. § 21-19,146

(a) A foreign corporation may not transact business in this state until it obtains a certificate of authority from the Secretary of State. (b) The following activities, among others, do not constitute transacting business within the meaning of subsection (a) of this section: (1) Maintaining, defending, or settling any proceeding; (2) Holding meetings of the board of directors or members or carrying on other activities concerning internal corporate affairs; (3) Maintaining bank accounts; (4) Maintaining offices or agencies for the transfer, exchange, and registration of memberships or securities or maintaining trustees or depositaries with respect to those securities; (5) Selling through independent contractors; (6) Soliciting or obtaining orders, whether by mail or through employees or agents or otherwise, if the orders require acceptance outside this state before they become contracts; (7) Creating or acquiring indebtedness, mortgages, and security interests in real or personal property; (8) Securing or collecting debts or enforcing mortgages and security interests in property securing the debts; (9) Owning, without more, real or personal property; (10) Conducting an isolated transaction which is completed within thirty days and which is not one in the course of repeated transactions of a like nature; or (11) Transacting business in interstate commerce. (c) The list of activities in subsection (b) of this section is not exhaustive.