UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ 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 incorporation or organization) Delaware 82-2668392 (I.R.S. Employer Identification Number) 200 East Randolph Street, 25th Floor Chicago, Illinois 60601 (312) 373-1000 (Address, including zip code, and telephone number, including area code, of registrant's ...