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or ANNUAL REPORT PURSUANT TO SECTION 13 or 15 ( d ) OF THE SECRURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended June 30 , 2021 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D. C. 20549 FORM 10 - K □ TRANSITION REPORT PURSUANT TO SECTION 13 or 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from Wisconsin ( State or Other Jurisdiction of Incorporation or Organization ) Title of each class Common Stock ( No Par Value ) Commission File Number 1-7635 1328 Racine Street , Racine , Wisconsin ( Address of Principal Executive Office ) Registrant's Telephone Number , including area code : TWIN DISC , INCORPORATED ( Exact Name of Registrant as Specified in its Charter ) to Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) TWIN Securities registered pursuant to Section 12 ( g ) of the Act : None ( Title of Class ) Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Large Accelerated Filer Non - accelerated Filer 39-0667110 ( I.R.S. Employer Identification Number ) Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . 53403 ( Zip Code ) ( 262 ) 638-4000 Accelerated Filer Smaller reporting company Name of each exchange on which registered The NASDAQ Stock Market LLC 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 . 1 Emerging growth company Yes No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) Yes No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See definitions of " large accelerated filer , ” “ accelerated filer , " " smaller reporting company , , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Yes No Yes No