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Table of Contents ( Mark One ) X ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 1934 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 Illinois ( State or other jurisdiction of incorporation or organization ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 22160 N. Pepper Road Lake Barrington , Illinois ( Address of principal executive offices ) FORM 10 - K Title of each class Common Stock , no par value per For the transition period from OR Securities registered pursuant to Section 12 ( b ) of the Act : share Commission File Number 000-23115 YUNHONG CTI LTD . ( Exact name of registrant as specified in its charter ) Registrant's telephone number , including area code : ( 847 ) 382-1000 to Ticker symbol ( s ) CTIB 36-2848943 ( I.R.S. Employer Identification No. ) 60010 ( Zip Code ) Name of each exchange on which registered The NASDAQ Stock Market LLC Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Exchange Act . Yes ☐ No Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the Registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No