STLD: Other company developments

Item 8.01. Other Events On November 9, 2026, Steel Dynamics, Inc. issued a press release titled “Steel Dynamics Announces Additional $3.0 Billion Share Repurchase Authorization and Fourth Quarter 2026 Cash Dividend.” A copy of that press release is attached hereto as Exhibit 99.1 and incorporated herein by reference. Item 9.01. Financial Statements and Exhibits (d) Exhibits. The following exhibit is filed with this report: Exhibit Numbe r Description 99.1 A press release dated November 9, 2026, titled “Steel Dynamics Announces Additional $3.0 Billion Share Repurchase Authorization and Fourth Quarter 2026 Cash Dividend.” 104 Cover Page Interactive Data File – the cover page interactive data file does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned hereto duly authorized. STEEL DYNAMICS, INC. /s/ Theresa E. Wagler Date: November 10, 2026 By: Theresa E. Wagler Title: Executive Vice President and Chief Financial Officer