FLUOR CORP

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material under §240.14a-12

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FLUOR CORPORATION​

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(Name of Registrant as Specified In Its Charter)

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(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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No fee required.

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Fee paid previously with preliminary materials.

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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DEAR FELLOW STOCKHOLDERS:

On behalf of our Board of Directors, thank you for your investment in Fluor. Our Board appreciates that it is elected by you, our stockholders, to oversee the management of our Company for the long-term benefit of all stakeholders.

We are pleased to invite you to join us at our 2026 annual meeting of stockholders to be held on Wednesday, May 6, 2026, at 8:30 a.m., Central Daylight Time. This year’s meeting will again be held virtually atwww.virtualshareholdermeeting.com/FLR2026. At this year’s meeting, we will vote on the election of ten directors and the ratification of Ernst & Young LLP as Fluor’s independent registered accounting firm. We will also hold a non-binding advisory vote to approve the compensation of Fluor’s named executive officers. Members of management will report on the state of the Company and respond to stockholder questions.

It is important that your shares be represented and voted at the annual meeting regardless of how many shares you own. Whether or not you plan to join the meeting, we encourage you to review our proxy materials and promptly cast your vote over the internet or by phone. Alternatively, if you receive a paper copy of the proxy materials by mail, you may vote by signing, dating and mailing the proxy card or voting instruction card in the envelope provided. Voting in any one of these ways will help ensure that your shares are represented at the meeting.

Our Board remains committed to serving your interests and appreciates your continued support of our Company. We look forward to you joining us virtually on May 6 th.

Sincerely,

March 12, 2026

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“THANK YOU FOR YOUR INVESTMENT IN FLUOR . . . . OUR BOARD REMAINS

COMMITTED TO SERVING YOUR INTERESTS AND APPRECIATES

YOUR CONTINUED SUPPORT OF OUR COMPANY.”

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

VOTING DETAILS

ITEMS OF BUSINESS

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All stockholders of record at the close of business on March 9, 2026, are entitled to receive notice of, and to vote at, the annual meeting of stockholders and any adjournment or postponement thereof. The annual meeting will be a virtual meeting, conducted exclusively online atwww.virtualshareholdermeeting.com/FLR2026. Stockholders as of the record date may participate in the annual meeting online, vote or submit questions by visiting the meeting website and logging in with the control number on their proxy card, voting instruction form or Notice of Internet Availability of Proxy Materials (the “Notice”). Instructions on how to further participate in the annual meeting are described in the accompanying proxy statement.

Please cast your vote by either voting your shares over the internet or by phone, as promptly as possible. Alternatively, if you have received paper copies of your proxy materials, you may complete, sign, date and promptly return the proxy card or voting instruction card in the postage-prepaid return envelope provided. Your prompt response is necessary to help ensure that your shares are represented. If you wish to receive paper copies of your proxy materials, including the proxy card or voting instruction card, follow the instructions in the Notice.

By Order of the Board of Directors,

Kevin B. Hammonds

Chief Legal Officer and Corporate Secretary

March 12 2026, Irving, Texas