UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 Form 10-Q ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934 Wisconsin 39-0667110 For the quarter ended December 25, 2020 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934 Commission File Number 1-7635 TWIN DISC, INCORPORATED (State or other jurisdiction of (I.R.S. Employer Incorporation or organization) Identification No.) 1328 Racine Street, Racine, Wisconsi ...