STLD: Company disclosure

Item 7.01. Regulation FD Disclosure. On September 17, 2026, Steel Dynamics, Inc. issued a press release titled “Steel Dynamics Provides Third Quarter 2026 Earnings Guidance.” A copy of that press release is attached hereto as Exhibit 99.1. The information contained in Exhibit 99.1 is furnished under this Item 7.01 and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or incorporated by reference in any filing thereunder or under the Securities Act of 1933, as amended, except as may be expressly set forth by specific reference in any such filing. Item 9.01. Financial Statements and Exhibits (d) Exhibits. The following exhibit is furnished with this report: Exhibit Number Description 99.1 A press release dated September 17, 2026, titled “Steel Dynamics Provides Third Quarter 2026 Earnings Guidance.” 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: September 18, 2026 By: Theresa E. Wagler Title: Executive Vice President and Chief Financial Officer