Telephone and Data Systems TDS Form 10-Q filing Q2 FY2026

Exhibits

Exhibit Number Description of Documents

Exhibit 2.1 LetterAgreement, dated February 4, 2026, related to the Securities Purchase Agreement, dated as of May 24, 2024, among TDS, Array, USCC Wireless Holdings, LLC and T-Mobile US, Inc.

Exhibit 10.1 Amendment to the Array 2022 Long-Term Incentive Plan is hereby incorporated by reference to Exhibit 10.1 to Array's Quarterly Report on Form 10-Q for the period ended March 31, 2026.

Exhibit 10.2 Form of Array 2022 Long-Term Incentive Plan 2026 Performance Award Agreement is hereby incorporated by reference to Exhibit 10.2 to Array's Quarterly Report on Form 10-Q for the period ended March 31, 2026.

Exhibit 10.3 Form of Array 2022 Long-Term Incentive Plan 2026 Restricted Stock Unit Award Agreement is hereby incorporated by reference to Exhibit 10.3 to Array's Quarterly Report on Form 10-Q for the period ended March 31, 2026.

Exhibit 10.4 TDS 2026 Executive Officer Bonus Program is hereby incorporated by reference to Exhibit 10.1 to TDS' Current Report on Form 8-K datedMarch 24, 2026.

Exhibit 10.5 Array 2026 Annual Incentive Planeffective January 1, 2026,is hereby incorporated by reference to Exhibit 10.1 to Array's Current Report on Form 8-K dated March 24, 2026.

Exhibit 31.1 Principal executive officer certification pursuant to Rule 13a-14 of the Securities Exchange Act of 1934.

Exhibit 31.2 Principal financial officer certification pursuant to Rule 13a-14 of the Securities Exchange Act of 1934.

Exhibit 32.1 Principal executive officer certification pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code.

Exhibit 32.2 Principal financial officer certification pursuant to Section 1350 of Chapter 63 of Title 18 of the United States Code.

Exhibit 101.INS XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.

Exhibit 101.SCH Inline XBRL Taxonomy Extension Schema Document

Exhibit 101.PRE Inline XBRL Taxonomy Presentation Linkbase Document

Exhibit 101.CAL Inline XBRL Taxonomy Calculation Linkbase Document

Exhibit 101.LAB Inline XBRL Taxonomy Label Linkbase Document

Exhibit 101.DEF Inline XBRL Taxonomy Extension Definition Linkbase Document

Exhibit 104 Cover Page Interactive Data File - the cover page interactive data file does not appear in the Interactive Data File because its XBRL tags are embedded within the inline document.

Form 10-Q Cross Reference Index

Item Number Page No.

Part I. Financial Information

Item 1. Financial Statements (Unaudited) 29 - 35

Notes to Consolidated Financial Statements 37 - 48

Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations 1 - 25

Item 3. Quantitative and Qualitative Disclosures About Market Risk 28

Item 4. Controls and Procedures 49

Part II. Other Information

Item 1. Legal Proceedings 50

Item#i18d5d70303a842b2af8ee5a04ee7be18_16492674430631A. Risk Factors 27

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds 51

Item 5. Other Information 52

Item 6. Exhibits 53

Signatures 55