Letter Agreement dated November 20, 2017 between United States Steel Corporation and Scott Buckiso

Definitions. For purposes of this Agreement, the following terms shall have the following meanings:

Term of Agreement. This Agreement is effective as of the date you sign this Agreement and shall continue in effect until [*], unless terminated earlier by notice from the Corporation to you [*] or by mutual agreement of the parties. In any event, this Agreement shall automatically terminate one year from the date of this Agreement, unless [*] this Agreement is extended by the mutual agreement of the parties.

[*] Payment. [*] subject to the other terms and conditions of this Agreement, including your execution and nonrevocation of a release of all claims relating to your employment with the Corporation (in a form to be provided to you by the Corporation), you will be eligible to receive the below payment that will be divided into two installments (the “[*] Payment”) as described in Paragraph 8:

Best Efforts. In consideration for this Agreement and your eligibility for the [*] Payment, you agree to [*] as requested. You further agree to [*]. In addition, you are expected to continue to comply with all applicable policies and procedures, including the Corporation’s Code of Ethical Business Conduct.

At-Will Employment. Nothing in this Agreement changes the at-will nature of your employment. Either you or the Corporation may terminate the employment relationship at any time, with or without notice and with or without cause.

Termination of Employment.

Voluntary Resignation or Retirement. You will not be eligible for the [*] Payment in the event you voluntarily resign your employment or elect to retire [*]. Further, you agree to refund to the Corporation, within sixty days of your notification of resignation or retirement, any and all of the [*] Payment that has been paid to date in the event you voluntarily resign your employment or elect to retire prior to the twelve month anniversary of the second installment payment.

Termination for Cause. In the event that your employment is terminated for cause [*], you agree to refund any amounts that have been paid of the [*] Payment within sixty days of your termination date, and you agree that you forfeit any amounts not yet paid of the [*] Payment.

Termination with Consent [*]. In the event that [*] you are terminated, you will be eligible for the [*] Payment, subject to the other terms and conditions of this Agreement.

Termination with Consent [*]. In the event that, [*] you are terminated, the Corporation may elect, in its sole discretion, to pay some or all of the [*] Payment.

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Disability or Death. If you are unable to perform your assigned duties due to physical or mental disability for a continuous period of at least six months [*] or you die [*], the Corporation may elect, in its sole discretion, to pay some or all of the [*] Payment.

Timing of [*] Payment. The Corporation will pay the [*] Payment to you, less applicable deductions and withholding, in two installments described herein. [*] The installment payments are subject to the other terms and conditions of this Agreement, including but not limited to the release of all claims relating to your employment with the Corporation.

Notice. For purposes of this Agreement, notices and all other communications provided for in this Agreement shall be in writing and shall be deemed to have been duly given when delivered or mailed by United States registered mail, return receipt requested, postage prepaid, addressed to the respective addresses set forth on the first page of this Agreement.

Miscellaneous.

The validity, interpretation, construction and performance of this Agreement shall be governed by the laws of the State of Pennsylvania.

You may not assign any of your rights under this Agreement.

The Corporation’s obligation to pay the [*] Payment shall be an unfunded and unsecured promise of the Corporation to pay money in the future. Nothing in the Agreement conveys a secured interest or right, title or claim in any property or assets of the Corporation.

Notwithstanding anything contained in this Agreement to the contrary, if any portion of the [*] Payment would constitute a parachute payment under section 280G of the Internal Revenue Code of 1986, as amended (the “Code”), and the regulations promulgated thereunder, then the [*] Payment shall be reduced to the extent necessary to cause the payment thereof not to be a parachute payment under section 280G of the Code and you shall have no further rights or claims with respect to the reduced portion.

Validity. The invalidity or unenforceability of any provision of this Agreement shall not affect the validity or enforceability of any other provision of this Agreement, which shall remain in full force and effect.

Resolution of Disputes. Any dispute or controversy arising under or in connection with this Agreement shall be settled exclusively by arbitration in accordance with the rules of the American Arbitration Association (“AAA”) then in effect. The parties agree that the arbitrator shall have the power to decide any motions brought by any party to the arbitration, including motions for summary judgment and/or adjudication and motions to dismiss and demurrers, prior to any arbitration hearing. The parties also agree that the arbitrator shall have the power to award any remedies, including attorneys’ fees, costs and equitable relief, available under applicable law. The parties further agree that the decision of the arbitrator shall be in writing and that any judgment upon the award rendered by the arbitrator may be entered by any court having jurisdiction thereof. The parties agree that the arbitration hearing shall take place in Pittsburgh, Pennsylvania. The Corporation will pay for any administrative or hearing fees and costs charged by the arbitrator or the AAA, except that you shall pay any filing fees associated with any arbitration that you initiate.

Entire Agreement. This Agreement contains the entire agreement between the parties and supersedes any other agreement or understanding between the parties hereto with respect to the issues that are the subject matter of this Agreement.

Amendment. This Agreement may not be amended or modified other than by a written agreement executed by the parties hereto, except that the Corporation may amend this Agreement from time to time without your consent to the extent deemed necessary or

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