UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934 (Amendment No.                 )

Filed by the Registrant x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨   Preliminary Proxy Statement

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

¨    Definitive Proxy Statement

☒   Definitive Additional Materials

¨  Soliciting Material under §240.14a-12

Crown Castle Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

x     No fee required

¨     Fee paid previously with preliminary materials

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

CROWN CASTLE INC.

8020 Katy Freeway

Houston, Texas 77024

SUPPLEMENT TO THE PROXY STATEMENT

FOR THE CROWN CASTLE INC.

2024 ANNUAL MEETING OF STOCKHOLDERS

TO BE HELD ON WEDNESDAY, MAY 22, 2024

9:00 AM (CENTRAL TIME)

The following Notice of Change to Slate of Company Nominees filed with the Securities and Exchange Commission ("SEC") on April 19, 2024 ("Supplement Date") relates to our Notice of Annual Meeting of Stockholders and Proxy Statement ("Proxy Statement") of Crown Castle Inc. ("Crown Castle," "Company," "we," "our," or "us"), dated April 11, 2024, and is being made available to stockholders of the Company in connection with the solicitation of proxies by the Board of Directors ("Board") of the Company for use in connection with the 2024 Annual Meeting of Stockholders ("2024 Annual Meeting").

NOTICE OF CHANGE TO SLATE OF COMPANY NOMINEES

On or about April 11, 2024, Crown Castle distributed via mail or made available to our stockholders via Internet our Proxy Statement. The Proxy Statement describes the matters to be voted upon at the 2024 Annual Meeting to be held on Wednesday, May 22, 2024 at 9:00 a.m. Central Time at our offices located at 8020 Katy Freeway, Houston, Texas 77024. This supplement ("Supplement") supplements and amends the Proxy Statement to revise the list of Company Nominees (defined below) standing for election to our Board and certain other information in the Proxy Statement, including the Company's WHITE proxy card. This Supplement should be read in conjunction with the Proxy Statement as you consider how to vote your shares. Capitalized terms not defined in this Supplement shall have the meanings ascribed to them in the Proxy Statement.

Your vote is especially important at the 2024 Annual Meeting. The Board unanimously recommends that you vote FOR ONLY the twelve (12) Company nominees up for election to the Board at the 2024 Annual Meeting ("Company Nominees"). Please vote using the WHITE proxy card or voting instruction form listing the twelve (12) Company Nominees, and as the Board recommends on all other proposals.

IF YOU HAVE ALREADY VOTED PRIOR TO THE SUPPLEMENT DATE,

YOU MUST RE-VOTE YOUR SHARES IN ORDER FOR YOUR VOTE TO BE COUNTED.

PLEASE READ THIS SUPPLEMENT CAREFULLY IN CONJUNCTION WITH THE PROXY STATEMENT.

Except as set forth herein, this Supplement does not change the proposals to be acted on at the 2024 Annual Meeting or our Board's recommendations with respect to the proposals, which are described in the Proxy Statement. Except as specifically supplemented or amended by the information contained in this Supplement, all information set forth in the Proxy Statement continues to apply and should be considered when voting your shares using one of the methods described in the Proxy Statement.

Change to Slate of Company Nominees

On Wednesday, April 10, 2024, the Company announced the appointment of Steven J. Moskowitz as our President and Chief Executive Officer ("CEO") and the appointment of Mr. Moskowitz to our Board, effective April 11, 2024. Shortly after the announcement, on Friday, April 12, 2024, Theodore B. Miller, Jr. and Boots Capital Management, LLC (together with Mr. Miller and other entities and persons affiliated or associated with Mr. Miller, collectively, "Boots Group") filed a motion in its ongoing litigation in the Delaware Court of Chancery (Theodore B. Miller, Jr., et al. v. P. Robert Bartolo, et al., Del. Ch., C.A. No. 2024-0176-JTL) seeking to enjoin Crown Castle from expanding the size of the Board to include Mr. Moskowitz as a thirteenth member on the basis that doing so would dilute the impact of the Boots Group's nominees to the Board.

The Company vigorously disputes the claims in the Boots Group's motion. Consistent with the Boots Group's approach throughout its campaign, we believe Mr. Miller has again pursued a litigation strategy that is attempting to interfere with the Company's critical strategic and operational initiatives. Although the Company vigorously disputes the Boots Group's claims, Crown Castle has determined it will not include Mr. Moskowitz on the Company's slate of director nominees for the 2024 Annual Meeting to avoid the distraction and expense of litigation. Stockholders will continue to have the opportunity to vote on the remaining twelve (12) highly qualified Company Nominees.

Mr. Moskowitz will serve as a director until the expiration of his current term at the 2024 Annual Meeting and will continue to serve as the Company's President and CEO. All of the current independent directors of the Board intend to vote to appoint Mr. Moskowitz to the Board immediately after the 2024 Annual Meeting. The Company and Mr. Moskowitz will continue to focus on advancing initiatives aimed at creating value for all stockholders.

Amendments

The Board has accordingly approved a reduction of the number of Company Nominees from thirteen (13) to twelve (12) nominees and has withdrawn Mr. Moskowitz's nomination for election as a director at the 2024 Annual Meeting. The twelve (12) Company Nominees for election at the 2024 Annual Meeting are:

•P. Robert Bartolo;

•Cindy Christy;

•Ari Q. Fitzgerald;

•Jason Genrich;

•Andrea J. Goldsmith;

•Tammy K. Jones;

•Kevin T. Kabat;

•Anthony J. Melone;

•Sunit S. Patel;

•Bradley E. Singer;

•Kevin A. Stephens; and

•Matthew Thornton, III.

At the 2024 Annual Meeting, the size of the Board will decrease to twelve (12) members. This means that twelve (12) directors will be elected at the 2024 Annual Meeting and stockholders cannot vote FOR more than twelve (12) director nominees. If you have previously voted using a proxy card or voting instruction form listing thirteen (13) Company Nominees, you are urged to vote again using the WHITE proxy card or voting instruction form listing twelve (12) Company Nominees and vote FOR ONLY the twelve (12) Company Nominees.

The individuals named under "IV. Election of Directors—Proposal" beginning on page 25 of the Proxy Statement, other than Mr. Moskowitz, will remain the Board's Company Nominees for election as directors to hold office for a term expiring at the first succeeding annual meeting of stockholders after their election, with each such director holding office until his or her successor shall have been duly elected and qualified, subject to their earlier death, resignation or removal.

References in the Proxy Statement to Steven J. Moskowitz as a Company Nominee, the number of directors to be elected at the 2024 Annual Meeting and the individuals nominated for election as a director at the 2024 Annual Meeting are hereby revised in all instances to reflect the foregoing.

Voting Recommendation

The Board unanimously recommends that you use the WHITE proxy card or voting instruction form to vote as the Board recommends on Proposals 1, 2, 3 and 4:

•Proposal 1: The Board unanimously recommends a vote FOR ONLY the twelve (12) Company Nominees.

•Proposal 2: The Board unanimously recommends a vote FOR ratification of the appointment of PricewaterhouseCoopers LLP as our independent registered public accountants for fiscal year 2024.

•Proposal 3: The Board unanimously recommends a vote FOR the approval of the compensation of our NEOs as disclosed in the Proxy Statement.

•Proposal 4: The Board unanimously recommends a vote AGAINST a proposal by the Boots Group to repeal each provision of, or amendment to, the By-Laws adopted by the Board without stockholder approval subsequent to December 19, 2023 and up to and including the date of the 2024 Annual Meeting, if such proposal is properly brought before the 2024 Annual Meeting.

Voting Instructions

If you have already voted using a proxy card or voting instruction form listing thirteen (13) Company Nominees, your vote will not be counted with respect to any of Proposals 1, 2, 3 or 4.

Accordingly, you are urged to re-vote using the WHITE proxy card or voting instruction form listing twelve (12) Company Nominees to ensure that your vote is counted.

  If you have not yet voted, please cast your vote using the WHITE proxy card or voting instruction form listing twelve (12) Company Nominees.

Stockholders can vote FOR less than twelve (12) nominees at the 2024 Annual Meeting but cannot vote FOR more than twelve (12) nominees.

The Board strongly urges you to discard and NOT vote using any gold proxy card sent to you by the Boots Group. If you vote using a gold proxy card sent to you by the Boots Group, you have every right to change your vote prior to the 2024 Annual Meeting, and we strongly urge you to revoke that proxy by using the WHITEproxy card or voting instruction form listing twelve (12) Company Nominees to vote FOR ONLY the twelve (12) Company Nominees recommended by the Board.

Please submit your proxy in advance of the 2024 Annual Meeting using one of the methods outlined in the Proxy Statement.

If you have any questions or require any assistance with voting your shares, please call the Company's proxy solicitor:

INNISFREE M&A INCORPORATED

at

(877) 717-3904 (toll-free from the United States and Canada)

or

+1 (412) 232-3651 (from other locations)

* * * * *

CAUTIONARY LANGUAGE REGARDING FORWARD-LOOKING STATEMENTS

This communication contains forward-looking statements for purposes of the safe harbor provisions of The Private Securities Litigation Reform Act of 1995. Statements that are not historical facts are hereby identified as forward-looking statements. In addition, words such as "estimate," "anticipate," "project," "plan," "intend," "believe," "expect," "likely," "predicted," "positioned," "continue," "target," "seek," "focus" and any variations of these words and similar expressions are intended to identify forward-looking statements. Examples of forward-looking statements include (1) that the actions set forth in this communication best position the Company for long term success, including our Board's regular evaluation of all paths to enhance stockholder value, (2) that the Company will benefit from the experience and insights of the directors, and (3) that the Company will identify the best path forward to capitalize on significant opportunities for growth in our industry. Such forward-looking statements should, therefore, be considered in light of various risks, uncertainties and assumptions, including prevailing market conditions, risk factors described in "Item 1A. Risk Factors" of the Annual Report on Form 10-K for the fiscal year ended December 31, 2023 and other factors. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those expected. Unless legally required, the

Company undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Our filings with the SEC are available through the SEC website at www.sec.gov or through our investor relations website at investor.crowncastle.com. We use our investor relations website to disclose information about us that may be deemed to be material. We encourage investors, the media and others interested in us to visit our investor relations website from time to time to review up-to-date information or to sign up for e-mail alerts to be notified when new or updated information is posted on the site.

Important Stockholder Information

The Company filed a definitive proxy statement and a WHITE proxy card with the SEC in connection with its solicitation of proxies for its 2024 Annual Meeting. THE COMPANY'S STOCKHOLDERS ARE STRONGLY ENCOURAGED TO READ THE DEFINITIVE PROXY STATEMENT, THE ACCOMPANYING WHITE PROXY CARD, AND ANY AMENDMENTS AND SUPPLEMENTS TO THESE DOCUMENTS, AS THEY CONTAIN IMPORTANT INFORMATION. Stockholders may or will be able to obtain the proxy statement, any amendments or supplements to the proxy statement, and other documents without charge from the SEC's website at www.sec.gov.

Participant Information

The Company, its directors, director nominees, certain of its officers, and other employees are or will be "participants" (as defined in Section 14(a) of the U.S. Securities Exchange Act of 1934, as amended) in the solicitation of proxies from the Company's stockholders in connection with the matters to be considered at the 2024 Annual Meeting. The identity, their direct or indirect interests (by security holdings or otherwise), and other information relating to the participants is available in the Company's definitive proxy statement on Schedule 14A filed with the SEC on April 11, 2024, on the section entitled "Beneficial Ownership of Common Stock" (on page 90) and Appendix C (on page C-1). To the extent the holdings by the "participants" in the solicitation reported in the Company's definitive proxy statement have changed, such changes have been or will be reflected on "Statements of Change in Ownership" on Forms 3, 4 or 5 filed with the SEC. All these documents are or will be available free of charge at the SEC's website at www.sec.gov.

The following is the Company's WHITE proxy card as revised to reflect the foregoing changes and is hereby filed with the SEC: