VALMONT INDUSTRIES INC

To Our Shareholders:

The board of directors of Valmont Industries, Inc. solicits your proxy in the form enclosed for use at the Annual Meeting of Shareholders to be held on Monday, April 27, 2026, or at any adjournments thereof.

At the close of business on March 2, 2026, the record date for shareholders entitled to notice of and to vote at the meeting, there were outstanding 19,547,213 shares of the Company’s common stock. There were no preferred shares outstanding. All holders of common stock are entitled to one vote for each share of stock held by them.

We will provide a live audio webcast of the meeting beginning at 10:00 a.m. Central Daylight Time on April 27, 2026. The webcast will provide the audio portion of the meeting only. The webcast does not constitute attendance, but will provide shareholders who cannot attend an opportunity to receive timely audio of the meeting. To listen to the meeting by telephone, please dial 1-877-407-6184 or 1-201-389-0877 (no Conference ID is needed), or go to investors.valmont.com, where a link will provide for access to the audio of the meeting.

The presence of a majority of the outstanding common stock represented in person or by proxy at the meeting will constitute a quorum. Shares represented by proxies that are marked “abstain” will be counted as shares present for purposes of determining the presence of a quorum. Proxies relating to “street name” shares that are voted by brokers on some matters will be treated as shares present for purposes of determining the presence of a quorum, but will not be treated as shares entitled to vote at the Annual Meeting on those matters as to which authority to vote is withheld by the broker (“broker non-votes”). Please note that if you hold your shares through a broker, your broker may not vote your shares on certain matters in the absence of your specific instructions as to how to vote. In order for your vote to be counted, please make sure that you submit your vote to your broker.

Election of the four director nominees requires the affirmative vote of a majority of the votes cast for the election of directors at the Annual Meeting. Votes may be cast in favor of or withheld with respect to all of the director nominees, or any of them. Abstentions and broker non-votes are not treated as votes cast and therefore will not affect the outcome of the election of directors. An incumbent director nominee who receives a greater number of votes “withheld” than “for” in an election is required to tender his or her resignation to the board, and the resignation will be accepted or rejected by the board as more fully described in Election of Directors.

The proposals to approve the ratification of the appointment of the auditors, approve the Valmont 2026 Employee Stock Purchase Plan and the approval of the advisory say-on-pay resolution on executive compensation will be decided by the affirmative vote of the holders of a majority of the shares present in person or

represented by proxy at the meeting and entitled to vote. Abstentions will be counted; they will have the same effect as a vote against the matter. Broker non-votes will be disregarded.

Any shareholder giving a proxy may revoke it before the meeting whether delivered by telephone, Internet or through the mail, by using the telephone voting procedures, the Internet voting procedures or by mailing a signed instrument revoking the proxy to: Corporate Secretary, Valmont Industries, Inc., 15000 Valmont Plaza, Omaha, Nebraska 68154-5215. To be effective, a mailed revocation must be received by the Corporate Secretary before the date of the meeting and a telephonic or Internet revocation must be submitted by 11:59 p.m. Eastern Time on April 26, 2026. A shareholder may attend the meeting in person and at that time withdraw the proxy and vote in person.

As permitted by Securities and Exchange Commission rules, Valmont is making this proxy statement and its annual report available to its shareholders electronically via the Internet. On March 11, 2026, we mailed to many of our shareholders a Notice of Internet Availability of Proxy Materials containing instructions on how to access this proxy statement and our annual report and to vote online. If you received such a Notice by mail, you will not receive a printed copy of the proxy materials in the mail. Instead, the Notice instructs you on how to access and review all of the important information contained in the proxy statement and annual report. The Notice also instructs you on how you may submit your proxy over the Internet. If you received a Notice by mail and would like to receive a printed copy of our proxy materials, you should follow the instructions for requesting such materials contained on the Notice.

The Securities and Exchange Commission’s rules permit us to deliver a single Notice or set of this proxy statement and our annual report to one address shared by two or more of our shareholders. This delivery method is referred to as “householding” and can result in significant cost savings. To take advantage of this opportunity, we have delivered only one Notice or set of this proxy statement and our annual report to multiple shareholders who share an address, unless we received contrary instructions from such shareholders prior to the mailing date. We agree to deliver promptly, upon written or oral request, a separate copy of the Notice or a set of this proxy statement and our annual report, as requested, to any shareholder at the shared address to which a single copy of those documents was delivered. If you prefer to receive separate copies of the Notice or this proxy statement and our annual report, contact Broadridge Financial Solutions, Inc. at 1-800-579-1639 or by email at sendmaterial@proxyvote.com.

The cost of solicitation of proxies, including the cost of reimbursing banks and brokers for forwarding proxy materials to their principals, will be borne by the Company.

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