UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

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FORM SD

Specialized Disclosure Report

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Valmont Industries, Inc.

(Exact name of registrant as specified in its charter)

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Delaware

1-31429

47-0351813

(State or other jurisdiction of incorporation)

(Commission File Number)

(IRS Employer Identification No.)

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15000 Valmont Plaza

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Omaha, NE

68154

(Address of principal executive offices)

(Zip Code)

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William E. Johnson, Chief Accounting Officer (402) 963-1000

(Name and telephone number, including area code, of the person to contact in connection with this report.)

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Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which the information in this form applies:

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X  Rule 13p-1 under the Securities Exchange Act (17 CFR 240.13p-1) for the reporting period from January 1 to December 31, 2025.

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Section 1 - Conflict Minerals Disclosure

Item 1.01 Conflict Minerals Disclosure and Report

The Conflict Minerals Report of Valmont Industries, Inc. is attached hereto as Exhibit 1.01 and incorporated by this reference.

A copy of this report is publicly available at www.valmont.com under "Investors — Financials — SEC Filings." Valmont's Conflict Minerals Policy is publicly available at www.valmont.com under "Investors — Governance — Documents & Charters.

Item 1.02 Exhibit

The Conflict Minerals Report required by Item 1.01 is filed as Exhibit 1.01 to this form.

Section 2 - Exhibits

Item 2.01 Exhibits

Exhibit 1.01 – Conflict Minerals Report.

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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 duly authorized undersigned.

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Valmont Industries, Inc.

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(Registrant)

Date: May 29, 2026

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/s/ William E. Johnson

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By: William E. Johnson

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Chief Accounting Officer

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