UNITED STATES SECURITIES AND EXCHANGE COMMISSION Commission file number: 1-36313 METALLUS INC. (Exact name of registrant as specified in its charter) WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to 1835 Dueber Avenue SW, Canton, OH 44706 (Address of principal exec ...