Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 1245 Q Street, Lincoln, Nebraska 68508 (Address of principal executive offices) (Zip Code) (402) 475-2525 (Registrant's telephone number, including area code) Securities registered ...