Nucor Corp — Amended Current Report (Form 8-K/A)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

(Amendment No. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): December 2, 2025

NUCOR CORPORATION

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (704) 366-7000

Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

EXPLANATORY NOTE

This Amendment No. 1 amends the Current Report on Form 8-K (the “Original 8-K”) Nucor Corporation (the “Company”) filed with the United States Securities and Exchange Commission (the “SEC”) on December 4, 2025, regarding, among other things, the retirement of David A. Sumoski from his employment with the Company. The disclosure included in the Original 8-K otherwise remains unchanged.

(e) On May 28, 2026, the Company and Mr. Sumoski entered into a Retirement, Separation, Waiver and Release Agreement (the “Retirement Agreement”) in connection with Mr. Sumoski’s retirement from employment with the Company, effective June 13, 2026. The Retirement Agreement, together with the Surviving Provisions (as defined in the Retirement Agreement) of the Executive Employment Agreement (the “Executive Employment Agreement”), effective as of January 1, 2021, by and between the Company and Mr. Sumoski, collectively contain the entire agreement of the parties and supersede all prior agreements between the parties related to Mr. Sumoski’s employment with the Company.

In consideration for Mr. Sumoski’s comprehensive release of claims against the Company and its affiliates and his post-employment restrictive covenants set forth in the Surviving Provisions of the Executive Employment Agreement, Mr. Sumoski will be entitled to receive monthly payments from the Company of $308,850.56 for the 24 months immediately following his retirement. Specifically, Mr. Sumoski has agreed, among other things, not to (i) compete with the Company during the 24-month period following his retirement, (ii) disclose confidential and proprietary information (including trade secrets) of the Company, (iii) encourage the Company’s existing or prospective customers or suppliers to purchase steel or steel products or related services from, or to provide steel or steel products or related services to, any competitor of the Company or otherwise attempt to influence any business or business negotiations such customers or suppliers may transact or have with the Company during the 24-month period following his retirement, (iv) hire or encourage any employee of the Company to terminate his or her employment with the Company during the 24-month period following his retirement and (v) make any statements that defame, disparage or in any way criticize the personal or business reputation, practices or conduct of the Company or its affiliates. Mr. Sumoski has also agreed that any inventions, designs or other ideas conceived by Mr. Sumoski during his employment with the Company will be assigned to the Company. Pursuant to the Retirement Agreement, effective as of June 13, 2026, Mr. Sumoski will resign from any and all positions he holds with the Company and its direct and indirect subsidiaries and affiliates.

The foregoing description of the terms and conditions of the Retirement Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Retirement Agreement (including the Executive Employment Agreement attached as Exhibit A thereto), a copy of which is filed as Exhibit 10.1 hereto and is incorporated herein by reference.

(d) Exhibits

SIGNATURES

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 hereunto duly authorized.