ARRAY DIGITAL INFRASTRUCTURE, INC.

Proxy Statement Summary

Governance Highlights

•Annual election of all directors

•Directors, officers and certain other employees prohibited from pledging or hedging shares

•The positions of Chair of the Board of Directors and President/Chief Executive Officer are separate

•Annual self-assessment of board and its committees

•Limits on other public board service

The following is a summary of the actions being taken at the 2025 Annual Meeting and does not include all the information that may be important to you. You should carefully read this entire Proxy Statement and not rely solely on the following summary.

Proposal 1—Election of Directors

Under the terms of Array's Restated Certificate of Incorporation ("Restated Charter"), the terms of all directors will expire at the 2025 Annual Meeting.

The holders of Common Shares are entitled to elect three directors. Your Board of Directors has nominated the following persons for election as directors by the holders of Common Shares: Harry J. Harczak, Jr., Esteban C. Iriarte, and Xavier D. Williams.

Telephone and Data Systems, Inc. ("TDS"), as the sole holder of Series A Common Shares, is entitled to elect six directors. Your Board of Directors has nominated the following persons for election as directors by the holder of Series A Common Shares: LeRoy T. Carlson, Jr., Walter C. D. Carlson, Douglas W. Chambers, Kenneth S. Dixon, Joseph R. Hanleyand Vicki L. Villacrez.

Our 2025 Director Nominees

*To be elected by Common Shares **To be elected by Series A Common Shares

Kenneth Dixon was initially elected by the Board of Directors effective July 1, 2025 to fill the vacancy on the Board created by the resignation of James Butman. Mr. Dixon was recommended as a candidate by TDS.

Joseph R. Hanley was initially elected by the Board of Directors on August 1, 2025, to fill a vacancy on the Board. He was recommended as a candidate by TDS.

Proposal 2—Ratification of Independent Registered Public Accounting Firm

As in prior years, shareholders are being asked to ratify PricewaterhouseCoopers LLP ("PwC") as the Company's independent registered public accounting firm for the year ending December 31, 2025.

Proposal 3—Charter Amendments

Shareholders are being asked to approve amendments to the Company’s Restated Certificate of Incorporation to reflect changes in the Company's business as a result of the recently-closed transaction with T-Mobile. Specifically, the amendments would update the description of Array’s current business in (i) a section of the Charter relating to the business in which the Company may engage without TDS’ consent and (ii) in a section of the Charter relating to corporate opportunities that may be claimed by the Company.

Proposal 4—Advisory Vote to Approve Executive Compensation or "Say-on-Pay"

Shareholders are being asked to approve, on an advisory basis, the compensation of our named executive officers for 2024.

NOTICE OF 2025 ANNUAL MEETING OF SHAREHOLDERS AND 2025 PROXY STATEMENT

TO THE SHAREHOLDERS OF

ARRAY DIGITAL INFRASTRUCTURE, INC.

We will hold the 2025 annual meeting of shareholders ("the 2025 Annual Meeting") of Array Digital Infrastructure, Inc. ("Array" or the "Company"), a Delaware corporation virtually, on Thursday, October 9, 2025, at 8:30 a.m., Central Time. At the meeting, we are asking shareholders to take the following actions:

1. To elect the director nominees named in this proxy statement.

2. To ratify the selection of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the year ending December 31, 2025.

3. To approve amendments to the Company’s Restated Certificate of Incorporation to reflect changes in the Company's business as a result of the recently-closed transaction with T-Mobile (the “Charter Amendments”).

4. To approve, on an advisory basis, the compensation of our named executive officers as disclosed herein (commonly known as "Say-on-Pay").

5. To transact such other business as may properly come before the meeting or any postponement, adjournment or recess thereof.

Your Board of Directors recommends a vote "FOR" each of the nominees for election as directors, "FOR" the proposal to ratify accountants, “FOR” approval of the Charter Amendments and "FOR" approval of the Say-on-Pay proposal.

We have fixed the close of business on August 15, 2025, as the record date for the determination of shareholders entitled to notice of, and to vote at, the 2025 Annual Meeting or any postponement, adjournment or recess thereof.

The annual meeting will be held in a virtual format only.

We are first sending this Notice of the 2025 Annual Meeting of Shareholders and Proxy Statement and proxy card, together with our 2024 Annual Report, on or about August 26, 2025, to shareholders who are receiving a paper copy of the proxy materials. We have made arrangements to commence mailing a Notice of Internet Availability of Proxy Materials on or about August 26, 2025 to other shareholders as discussed below.

You will be able to attend and participate in the Annual Meeting online, vote your shares electronically and submit your questions prior to and during the meeting by visiting: https://meetnow.global/MFYXJQ4 at 8:30 am Central on Thursday, October 9, 2025.