UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549FORM 8-KCURRENT REPORTPursuant to Section 13 or 15(d)of the Securities Exchange Act of 1934Date of Report (Date of earliest event reported): September 11, 2026 (September 10, 2026)ALCOA CORPORATION(Exact name of registrant as...