EXHIBIT 4.4C THIRD SUPPLEMENTAL INDENTURE THIS THIRD SUPPLEMENTAL INDENTURE is dated as of December 31, 2002, among STEEL DYNAMICS, INC., an Indiana corporation (the "Company"), SDI INVESTMENT COMPANY, a Delaware corporation, (the "Initial Subsidiary Guarantor"), DYNAMIC BAR PRODUCTS, LLC, an Indiana limited liability company (the "Second Subsidiary Guarantor"), STLD HOLDINGS, INC. an Indiana corporation, FERROUS RESOURCES, LLC, an Indiana limited liability company (STLD Holdings, Inc. and Ferrous Resources, LLC may individually be referred to as the "Additional Subsidiary Guarantor" and collectively as the "Additional Subsidiary Guarantors"), STEEL DYNAMICS SALES NORTH AMERICA, INC., an Indiana corporation (the "New Subsidiary Guarantor"), and FIFTH THIRD BANK, INDIANA, a state banking association, as trustee (the "Trustee"). RECITALS: The Company, the Initial Subsidiary Guarantor and the Trustee have duly authorized, executed and delivered an Indenture dated as of March 26, 2002 (the "Original Indenture") in connection with the issuance initially of up to $200,000,000 aggregate principal amount of the Company's 9-1/2% Senior Notes due 2009 (the "Notes") as provided in the Original Indenture. The Company, the Initial Subsidiary Guarantor, the Second Subsidiary Guarantor, and the Trustee entered into a First Supplemental Indenture dated as of September 6, 2002. The Company, the Initial Subsidiary Guarantor, the Second Subsidiary Guarantor, the Additional Subsidiary Guarantors and the Trustee entered into a Second Supplemental Indenture dated as of September 30, 2002. This Third Supplemental Indenture is being executed and delivered by the Company, the Initial Subsidiary Guarantor, the Second Subsidiary Guarantor, the Additional Subsidiary Guarantors and the New Subsidiary Guarantor pursuant to the provisions of Section 4.20 and Section 9.01(2) of the Original Indenture. This Third Supplemental Indenture (together with the Original Indenture, the First Supplemental Indenture and the Second Supplemental Indenture, collectively the "Indenture") is subject to, and shall be governed by, the provisions of the Trust Indenture Act of 1939, as amended, that are required to be a part of and to govern indentures qualified under the Trust Indenture Act of 1939, as amended. AND THIS THIRD SUPPLEMENTAL INDENTURE FURTHER WITNESSETH: For and in consideration of the premises, it is mutually covenanted and agreed, for the equal and proportionate benefit of all Holders, as follows: ARTICLE ONE Guaranty of Notes Section 1.01. Note Guarantee; Limitation of Liability. (a) Subject to the provisions of Article Ten of the Original Indenture, the New Subsidiary Guarantor hereby, jointly and severally with the Initial Subsidiary Guarantor, the Second Subsidiary Guarantor and the Additional Subsidiary Guarantors, fully and unconditionally guarantee to each Holder of Notes and to the Trustee on behalf of the Holders: (i) the due and punctual payment of the principal of, premium, if any, on and interest on each Note, when and as the same shall become due and payable, whether at maturity, by acceleration or otherwise, the due and punctual payment of interest on the overdue principal of and interest, if any, on the Notes, to the extent lawful, and the due and punctual performance of all other obligations of the Company to the Holders or the Trustee, all in accordance with the terms of such Note, the Original Indenture, the First Supplemental Indenture, the Second Supplemental Indenture and this Third Supplemental Indenture and (ii) in the case of any extension of time of payment or renewal of any Notes or any of such other obligations, that the same will be promptly paid in full when due or performed in accordance with the terms of the extension or renewal, at Stated Maturity, by acceleration or otherwise, subject, however, in the case of clauses (i) and (ii) above, to the limitations set forth in the second paragraph of Section 10.01 of the Original Indenture. (b) The undersigned, and by their acceptance of this Third Supplemental Indenture, hereby confirm that it is the intention of all such Persons that this Third Supplemental Indenture, the Original Indenture, the First Supplemental Indenture and the Second Supplemental Indenture and the obligations of the undersigned hereunder and thereunder not constitute a fraudulent transfer or conveyance for purposes of Bankruptcy Law, the Uniform Fraudulent Conveyance Act, the Uniform Fraudulent Transfer Act or any similar foreign, federal or state law to the extent applicable to this Third Supplemental Indenture, the Original Indenture, the First Supplemental Indenture, the Second Supplemental Indenture and the obligations of the undersigned hereunder and thereunder. To effectuate the foregoing intention, the undersigned hereby irrevocably agree that the obligations of the undersigned under this Third Supplemental Indenture, the Original Indenture, the First Supplemental Indenture and the Second Supplemental Indenture at any time shall be limited to the maximum amount as will result in the obligations of the undersigned under this Third Supplemental Indenture, the Original Indenture, the First Supplemental Indenture and the Second Supplemental Indenture not constituting a fraudulent transfer or conveyance. Section 1.02. Obligations under the Original Indenture. The New Subsidiary Guarantor hereby agrees, as of the date first above written, to be bound as a Subsidiary Guarantor by all of the terms and conditions of the Original Indenture to the same extent as each of the other Subsidiary Guarantors thereunder. The New Subsidiary Guarantor further agrees, as of the date first above written, that each reference in the Original Indenture to a "SUBSIDIARY GUARANTOR" shall also mean and be a reference to the New Subsidiary Guarantor, and each reference in any of the Notes to a "SUBSIDIARY GUARANTOR" shall also mean and be a reference to the New Subsidiary Guarantor. 2 Section 1.03. Covenants and Agreements. The New Subsidiary Guarantor makes each covenant and agreement set forth in Article Ten of the Original Indenture to the same extent as each other Subsidiary Guarantor. ARTICLE TWO Miscellaneous Section 2.01. Remainder of Original Indenture Unaffected. Except as specifically provided in Article One above, the terms of the Original Indenture shall remain unchanged and in full force and effect, and shall govern the interpretation and application of this Third Supplemental Indenture. Section 2.02. Duplicate Originals; Delivery by Telecopier. The parties may sign any number of copies of this Third Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. Delivery of an executed counterpart of a signature page to this Third Supplemental Indenture by telecopier shall be effective as delivery of an original executed counterpart of this Third Supplemental Indenture. Section 2.03. Separability. In case any provision in this Third Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby. [End of Article Two] 3 SIGNATURES IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be duly executed, all as of the date first written above. "Company" STEEL DYNAMICS, INC. By: ___________________________________ Its ___________________________________ "Initial Subsidiary Guarantor" SDI INVESTMENT COMPANY By: ___________________________________ Its ___________________________________ "Second Subsidiary Guarantor" DYNAMIC BAR PRODUCTS, LLC By: ___________________________________ Its ___________________________________ "Additional Subsidiary Guarantor" STLD HOLDINGS, INC. By: ___________________________________ Its ___________________________________ "Additional Subsidiary Guarantor" FERROUS RESOURCES, LLC By: ___________________________________ Its ___________________________________ "Trustee" FIFTH THIRD BANK, INDIANA By: ___________________________________ Its ___________________________________ 4 "New Subsidiary Guarantor" STEEL DYNAMICS SALES NORTH AMERICA, INC. By: ___________________________________ Its ___________________________________ 5