DOC ID ----> 202111902330 EXHIBIT 3.1

DOC ID ----> 202111902330 Page 1 of 2Form 540 Last Revised: 06/2019 Toll Free: 877.767.3453 | Central Ohio: 614.466.3910 OhioSoS.gov | business@OhioSoS.gov File online or for more information: OhioBusinessCentral.gov Certificate of Amendment (For-Profit, Domestic Corporation) Filing Fee: $50 Form Must Be Typed Check appropriate box: Amendment to existing Articles of Incorporation (125-AMDS) Amended and Restated Articles (122-AMAP) - The following articles supersede the existing articles and all amendments thereto. Name of Corporation Charter Number The articles are hereby amended by the Incorporators. Pursuant to Ohio Revised Code section 1701.70 (A), incorporators may adopt an amendment to the articles by a writing signed by them if initial directors are not named in the articles or elected and before subscriptions to shares have been received. The articles are hereby amended by the Directors. Pursuant to Ohio Revised Code section 1701.70(A), directors may adopt amendments if initial directors were named in articles or elected, but subscriptions to shares have not been received. Also, Ohio Revised Code section 1701.70(B) sets forth additional cases in which directors may adopt an amendment to the articles. The articles are hereby amended by the Shareholders pursuant to Ohio Revised Code section 1701.71. The articles are hereby amended and restated pursuant to Ohio Revised Code section 1701.72. The resolution was adopted pursuant to Ohio Revised Code section 1701.70(B) (In this space insert the number 1 through 10 to provide basis for adoption.) Check one box below and provide information as required: Complete the following information: Form 540 Prescribed by: CLEVELAND-CLIFFS INC. 649806

DOC ID ----> 202111902330 Page 2 of 2Form 540 Last Revised: 06/2019 A copy of the resolution of amendment is attached to this document. Note: If amended articles were adopted, they must set forth all provisions required in original articles except that articles amended by directors or shareholders need not contain any statement with respect to initial stated capital. See Ohio Revised Code section 1701.04 for required provisions. If you are amending the total number of shares, please complete this box so the appropriate filing fee is charged. Total number of shares previously listed in the Articles or other Amendments with the Ohio Secretary of State: With the submission of this amendment, NEW total number of shares: Print Name By (if applicable) Signature Print Name By (if applicable) Signature By signing and submitting this form to the Ohio Secretary of State, the undersigned hereby certifies that he or she has the requisite authority to execute this document. Required Must be signed by all incorporators, if amended by incorporators, or an authorized officer if amended by directors or shareholders, pursuant to Ohio Revised Code section 1701.73(B) and (C). If authorized representative is an individual, then they must sign in the "signature" box and print their name in the "Print Name" box. If authorized representative is a business entity, not an individual, then please print the business name in the "signature" box, an authorized representative of the business entity must sign in the "By" box and print their name in the "Print Name" box. Executive Vice President, Chief Legal Officer & Secretary James D. Graham

DOC ID ----> 202111902330 ATTACHMENT TO CERTIFICATE OF AMENDMENT BY SHAREHOLDERS TO FOURTH AMENDED ARTICLES OF INCORPORATION OF CLEVELAND-CLIFFS INC. RESOLVED, that the full text of the first paragraph of Article Fourth of the Corporation’s Fourth Amended Articles of Incorporation, as amended (prior to Division A thereof), is hereby amended as set forth below: “FOURTH: The maximum number of shares the Corporation is authorized to have outstanding is One Billion Two Hundred Seven Million (1,207,000,000) shares, consisting of the following: (a) Three Million (3,000,000) shares of Serial Preferred Stock, Class A, without par value ("Class A Preferred Stock"); (b) Four Million (4,000,000) shares of Serial Preferred Stock, Class B, without par value ("Class B Preferred Stock"); and (c) One Billion Two Hundred Million (1,200,000,000) Common Shares, par value $0.125 per share ("Common Shares").”