Centuri Holdings, Inc.

ANNUAL MEETING OF STOCKHOLDERS

To Be Held on May 19, 2026

GENERAL INFORMATION

We are providing these proxy materials to you in connection with the solicitation of proxies by the Board of Directors (the “Board”) of Centuri Holdings, Inc. (“we,” “us,” “our,” the “Company” or “Centuri”) for the 2026 Annual Meeting of Stockholders (the “Annual Meeting”) and for any adjournment or postponement of the Annual Meeting. The Annual Meeting will be held in a completely virtual format on May 19, 2026 at 2:00 p.m. Eastern Time.

Important Notice Regarding the Availability of Proxy Materials for

the Annual Meeting to be Held on May 19, 2026

Pursuant to the rules adopted by the U.S. Securities and Exchange Commission (the “SEC”), we have elected to provide access to our proxy materials over the internet. Accordingly, we are sending a Notice Regarding the Internet Availability of Proxy Materials (the “Notice”) to certain of our stockholders of record. We are also sending a paper copy of the proxy materials and Proxy Card to other stockholders of record who have indicated they prefer receiving such materials in paper form. Brokers and other nominees who hold shares on behalf of beneficial owners will be sending their own similar Notice. We intend to commence mailing the Notice or paper copies of this proxy statement and Proxy Card, as applicable, on or about April 6, 2026 to all stockholders entitled to vote at the Annual Meeting.

Stockholders will have the ability to access the proxy materials on the website referred to in the Notice or may request to receive a paper copy of the proxy materials by mail or electronic copy by electronic mail on a one-time or ongoing basis. Instructions on how to request a printed copy by mail or electronically may be found on the Notice.

The Notice will also identify the date, time and location of the Annual Meeting; the matters to be acted upon at the Annual Meeting and the Board’s recommendation with regard to each matter; a toll-free telephone number, an e-mail address, and a website where stockholders can request to receive, free of charge, a paper or e-mail copy of this proxy statement, our Annual Report on Form 10-K for the fiscal year ended December 28, 2025 (the “Annual Report”) and a form of proxy relating to the Annual Meeting; information on how to access and vote the form of proxy; and information on how to obtain instructions to attend the virtual meeting and vote in person at the virtual meeting, should stockholders choose to do so.

What is the purpose of the Annual Meeting?

At the Annual Meeting, stockholders will be asked to vote on the following matters:

•The election of nine directors of the Company;

•The approval, on a non-binding, advisory basis, of the Company’s executive compensation;

•The approval of the Centuri Employee Stock Purchase Plan;

•The ratification of the selection of PricewaterhouseCoopers LLP as the independent registered public accounting firm for the Company for fiscal 2026; and

•Any other matter that may properly come before the Annual Meeting or any adjournment thereof.

How do I attend the Annual Meeting?

The Annual Meeting will be a completely virtual meeting of stockholders. You will be able to submit questions prior to the Annual Meeting and vote online by logging on to www.proxyvote.com using the 16-digit control number found in the proxy materials previously distributed to you. Attendance at the Annual Meeting will be limited to stockholders of the Company as of March 23, 2026, the record date for the Annual Meeting, and guests of the Company. You will not be able to attend the Annual Meeting in person at a physical location.

You may attend the Annual Meeting by visiting http://www.virtualshareholdermeeting.com/CTRI2026. You will need your unique control number, which appears in the Notice, the Proxy Card or voting instructions that accompanied the proxy materials. In the event that you do not have a control number, please contact your broker, bank or other nominee as soon as possible so that you can be provided with a control number and gain access to the meeting.

Although the meeting webcast will begin at 2:00 p.m. Eastern Time on May 19, 2026, we encourage you to access the meeting site 15 minutes prior to the start time to allow ample time to log into the meeting webcast and test your computer system.

Technical Disruptions. In the event of any technical disruptions or connectivity issues during the course of the Annual Meeting, please allow for some time for the meeting website to refresh automatically, and/or for the meeting operator to provide verbal updates.

Stockholder List. As required by Delaware law, we will make available a list of registered stockholders as of March 23, 2026, the record date of the Annual Meeting, for inspection by stockholders for any purpose germane to the Annual Meeting from May 8, 2026, through May 18, 2026 at our headquarters located at 19820 North 7th Avenue, Suite 120, Phoenix, Arizona 85027. If you wish to inspect the list, please submit your request, along with proof of your share ownership, by e-mail to investors@centuri.com.

How can I submit questions prior to and during the Annual Meeting?

Prior to the Annual Meeting, you may submit questions pertaining to the business of the meeting by accessing www.proxyvote.com using the 16-digit control number found in the proxy materials distributed to you any time before 11:59 p.m., Eastern Time, on the day before the meeting. During the Annual Meeting, as well as 15 minutes prior to the start time, stockholders will also be able to submit questions through the online platform used for the Annual Meeting athttp://www.virtualshareholdermeeting.com/CTRI2026. The Company will respond to germane questions during the meeting and will endeavor to answer as many questions submitted by stockholders as time permits. However, if there are questions pertinent to matters properly before the Annual Meeting that cannot be answered during the meeting due to time constraints, we will post answers to a representative set of such questions at the “Investor Relations” section of the Company’s website atwww.centuri.com. The questions and answers will be available as soon as practicable after the Annual Meeting and will remain available until we file our proxy statement for the 2027 Annual Meeting of Stockholders. We reserve the right to edit questions to remove inappropriate language and to exclude questions regarding topics that are not pertinent to meeting matters. If we receive substantially similar questions, we may group such questions together and provide a single response.

Who is entitled to vote at the Annual Meeting?

Only stockholders of record at the close of business on March 23, 2026, the record date for the Annual Meeting, are entitled to receive notice of and to vote at the Annual Meeting. If you are a stockholder of record on that date, you are entitled to vote all of the shares that you held on that date at the Annual Meeting, or any adjournment or postponement of the Annual Meeting.

How many votes do I have?

You have one vote for each share of Common Stock owned as of the record date for the Annual Meeting.

How do I vote?

If your shares are registered directly in your name, you are the holder of record of those shares and can vote your shares either by proxy, whether or not you attend the virtual Annual Meeting, or by ballot by attending the virtual Annual Meeting. Whether or not you plan to attend the virtual Annual Meeting, we encourage you to submit your proxy promptly to ensure that your votes are counted. You may still attend the virtual Annual Meeting and vote by ballot even if you have already submitted a proxy.

Stockholders have a choice of voting online, by telephone, by mail, or at the Annual Meeting:

•If you received a printed copy of the proxy materials, please follow the instructions on your Proxy Card or voter instruction form. Your Proxy Card or voter instruction form provides information on how to vote.

•If you received a Notice of Internet Availability, please follow the instructions on the notice. The Notice of Internet Availability provides information on how to vote.

•If you received an e-mail notification, please click on the link provided in the e-mail notification and follow the instructions on how to vote.

If you hold your shares in a brokerage account or through a bank, trust or other nominee (collectively, a “broker”), you are the beneficial owner of the shares, and the shares are held in “street name.” You will receive instructions from your broker on how to vote your shares. Your broker will allow you to deliver your voting instructions over the internet and may also permit you to

submit your voting instructions by telephone or by completing, dating and signing the Proxy Card included with your proxy materials if you request a paper copy of them by following the instructions on the notice provided by your broker.

Can I revoke or change my vote?

Yes, a record holder can revoke or change a vote at any time prior to the voting of shares at the Annual Meeting by (a) casting a new vote by telephone or online; (b) sending a new Proxy Card with a later date; (c) sending a written notice of revocation that is received on or prior to May 18, 2026, by mail to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717; or (d) voting by ballot at the virtual Annual Meeting. If a broker, bank, trustee or other nominee holds your shares, you must contact them in order to find out how to change your vote.

What are the Board’s recommendations?

The Board’s recommendations are set forth within the description of each proposal in this Proxy Statement. In summary, the Board recommends a vote:

•FOR the election of the slate of directors nominated by the Board (see Proposal 1);

•FOR the approval of the Company’s executive compensation (see Proposal 2);

•FOR the approval of the Centuri Employee Stock Purchase Plan (see Proposal 3); and

•FOR the ratification of the selection of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for fiscal 2026 (see Proposal 4).

How many votes must be present to hold the Annual Meeting?

In order to conduct business at the Annual Meeting, the holders of a majority of the outstanding shares of Common Stock entitled to vote generally for the election of directors must be present at the meeting. Shares are counted as present at the meeting if (i) you are present online and vote at the meeting, or (ii) you have properly and timely submitted your proxy as described above under “How do I attend the Annual Meeting?” This is called a quorum. As of the close of business on March 23, 2026, 100,844,515 shares of Common Stock were outstanding and entitled to vote. Proxies received but marked as abstentions will be included in the calculation of the votes considered to be present at the meeting.

What is a “broker non-vote”?

A “broker non-vote” occurs when a broker lacks discretionary authority to vote on a “non-routine” proposal and a beneficial owner fails to give the broker voting instructions on that matter. The rules of the New York Stock Exchange (“NYSE”) determine whether matters presented at the Annual Meeting are “routine” or “non-routine” in nature. The election of directors is considered a “non-routine” matter. The advisory vote to approve the Company’s executive compensation is considered a “non-routine” matter. Similarly, the vote to approve the Centuri Employee Stock Purchase Plan is considered a “non-routine” matter. Therefore, beneficial owners who hold their shares in street name must provide voting instructions to their brokers in order for their broker to vote their shares on these matters. As a result, if you do not instruct your broker on how to vote your shares, then your shares will not be voted on these proposals. We urge you to instruct your broker about how you wish your shares to be voted. The ratification of the selection of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for fiscal 2026 is considered a “routine” matter, and brokers will have discretionary authority to vote on this matter without any instruction from the beneficial owners.

What vote is required to approve each Proposal?

The nine nominees for director who receive the highest number of votes “FOR” their election will be elected as directors. This is called a “plurality vote.” The affirmative vote of the holders of a majority of the shares of Common Stock represented in person or by proxy and entitled to vote on the matter at the Annual Meeting will be required to (i) approve, on an advisory basis, the Company’s executive compensation, (ii) approve the Centuri Employee Stock Purchase Plan, and (iii) ratify the appointment of PricewaterhouseCoopers LLP as the independent registered public accounting firm for the Company for fiscal 2026.

How are my votes counted?

•Election of Directors: You may vote “FOR ALL,” or “WITHHOLD ALL,” or “FOR ALL EXCEPT.” If you mark “FOR ALL,” your votes will be counted for all of the director nominees. Abstentions and any broker non-votes will not be counted as votes cast and will, therefore, have no effect on the election of directors.

•Advisory Vote to Approve Executive Compensation: You may vote “FOR,” “AGAINST,” or “ABSTAIN” with respect to the advisory vote to approve the Company’s executive compensation. The result of this vote is non-binding. However,

the Board will consider the outcome of the vote when making future executive compensation decisions. Abstentions will have the same effect as a vote AGAINST this proposal, and broker non-votes will have no effect on the outcome of this proposal.

•Approval of the Centuri Employee Stock Purchase Plan: You may vote “FOR,” “AGAINST,” or “ABSTAIN” with respect to approval of the Centuri Employee Stock Purchase Plan. Abstentions will have the same effect as a vote AGAINST this proposal, and broker non-votes will have no effect on the outcome of this proposal.

•Ratification of the selection of PricewaterhouseCoopers LLP: You may vote “FOR,” “AGAINST,” or “ABSTAIN” with respect to the ratification of the selection of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for fiscal 2026. Abstentions will have the same effect as a vote AGAINST this proposal, and broker non-votes will have no effect on the outcome of this proposal.

We will appoint an independent inspector of election in advance of the meeting to tabulate votes, to ascertain whether a quorum is present, and to determine the voting results on all matters presented to Company stockholders.

What if I do not vote for any or all of the matters listed on my Proxy Card?

As a stockholder of record, if you return a signed Proxy Card without indicating your vote on any or all of the matters to be considered at the Annual Meeting, your shares will be voted “FOR” the director nominees listed on the Proxy Card, “FOR” the approval of the advisory vote to approve executive compensation, “FOR” the approval of the Centuri Employee Stock Purchase Plan and “FOR” the ratification of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting firm for fiscal 2026, if you have not voted otherwise on a particular proposal. With respect to any other matter that properly comes before the Annual Meeting, Gregory A. Izenstark and Jason S. Wilcock, the proxies designated by the Board and identified in the accompanying Proxy Card, will vote all proxies granted to them at their discretion.

Are proxy materials available online?

You can obtain complete copies of the Notice of 2026 Annual Meeting of Stockholders, this Proxy Statement and the 2025 Annual Report to Stockholders by logging on to www.proxyvote.com with the 16-digit control number found in the proxy materials previously distributed to you.

What happens if the Annual Meeting is postponed or adjourned?

If the Annual Meeting is postponed or adjourned, your proxy will still be valid and may be voted at the postponed or adjourned meeting. You will still be able to change or revoke your proxy until it is voted at the Annual Meeting.

Who is soliciting my proxy?

Your proxy is being solicited by the Board, and the Company will bear the entire cost of the proxy solicitation. Arrangements have also been made with brokerage houses and other custodians, nominees and fiduciaries to send proxies and proxy materials to you if your shares are held in “street name.” In addition, our directors, officers or employees may solicit proxies in person or by telephone, e-mail or facsimile. No additional compensation will be paid for such services.

How can I find out the results of the voting at the Annual Meeting?

We will report the voting results in a filing with the SEC on a Current Report on Form 8-K within four business days of the conclusion of the Annual Meeting. If the official results are not available at that time, we intend to file a Form 8-K to publish the preliminary results within four business days after the Annual Meeting and file an additional Form 8-K to publish the final results within four business days after the final results are known to us.

What is “Householding”?

In order to reduce expenses, we are taking advantage of certain SEC rules, commonly known as “householding,” that permit us to deliver, in certain cases, only one Notice, Annual Report, or Proxy Statement, as applicable, to multiple stockholders sharing the same address, unless we have received contrary instructions from one or more of the stockholders. If you received a householded mailing this year and would like to have additional copies of the Notice, the Annual Report, Proxy Statement, or other proxy materials sent to you, please submit your request directed to our Corporate Secretary, Centuri Holdings, Inc., 19820 North 7th Avenue, Suite 120, Phoenix, Arizona 85027, or by telephone at (623) 582-1235. If you hold your stock in street name, you may revoke your consent to householding at any time by notifying your broker.

If you are currently a stockholder sharing an address with another of our stockholders and wish to have your future proxy statements and annual reports householded, or your materials are currently householded and you would prefer to receive separate materials in the future, please contact our Corporate Secretary at the above address or telephone number.