What changed in this filing

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Item 9A. Controls and Procedures

2026-02-11 compared with 2025-01-31 · 142 added, 119 removed, 418 unchanged (38% of the section changed)

7 unchanged sentences

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting, as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act, during our most recently completed fiscal quarter that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

We are currently preparing to implement a new global enterprise resource planning (“ERP”) system, which will replace many of our operating and financial systems.

There were no changes in our internal control over financial reporting during our most recently completed fiscal quarter that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

In the second quarter of 2025, we began the implementation of a new global enterprise resource planning (“ERP”) system.

The implementation is expected to occur in phases over the next several years and will replace many of our operating and financial systems.

The ERP system is designed to accurately maintain our financial records, support integrated billing, supply chain and other operational functionality, facilitate data analysis and accelerate information reporting to our management team related to the operation of the business.

The implementation is expected to occur in phases over the next several years.

As the phased implementation of the new ERP system continues, we could have changes to our processes and procedures which, in turn, could result in changes to our internal control over financial reporting.

10 unchanged sentences

Other Information

On November 6, 2024 , Michael Katz , President, Marketing, Strategy and Products , adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell up to 2,500 shares of the Company’s common stock between May 15, 2025, and December 31, 2025 , and up to 6,204 shares of the Company’s common stock to be acquired on February 15, 2025, upon the vesting of certain time-based restricted stock unit awards, between February 18, 2025, and December 31, 2025, subject to certain conditions.

The duration of this trading plan is 420 days.

On November 12, 2024 , Callie Field , President, Business Group , adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell on February 18, 2025 , all of her T-Mobile US, Inc.

common stock to be acquired on February 15, 2025, upon the vesting of certain time-based restricted stock unit awards and performance-based restricted stock unit awards (“PRSUs”), up to a total of 43,582 shares assuming PRSUs will vest at maximum value, subject to certain conditions.

The duration of this trading plan is 99 days.

On November 14, 2024 , G.

Michael Sievert , President and Chief Executive Officer , adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell up to 180,000 shares of T-Mobile US, Inc.

common stock between February 25, 2025, and November 18, 2025 , subject to certain conditions.

The duration of this trading plan is 370 days.

On November 25, 2024 , Ulf Ewaldsson , the Company’s President, Technology , adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell up to 19,407 shares of the Company’s common stock on February 21, 2025 , subject to certain conditions.

The duration of this trading plan is 89 days.

On November 26, 2024 , Peter Osvaldik , the Company’s Chief Financial Officer , adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell up to 25,000 shares of the Company’s common stock between February 27, 2025, and November 28, 2025 , subject to certain conditions.

On December 2, 2025 , Claure Mobile LLC, an entity affiliated with Marcelo Claure , a director of the Company, adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell, subject to certain conditions, up to 1,250,000 shares of the Company’s common stock.

The duration of this trading plan is 376 days.

On December 13, 2024 , Raul Marcelo Claure , a member of the Company’s Board of Director s, adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell up to 620,400 shares of the Company’s common stock between April 12, 2025, and December 31, 2025 , subject to certain conditions.

On December 4, 2025 , Michael J.

Katz , the Company’s Chief Business and Product Officer , adopted a trading plan intended to satisfy the affirmative defense of Rule 10b5-1(c) to sell, subject to certain conditions, up to 15,000 shares of the Company’s common stock.

The duration of this trading plan is 393 days.

6 unchanged sentences

We have adopted a Policy on Securities Trading that governs the purchase, sale, and/or other dispositions of our securities by directors, officers and employees that is reasonably designed to promote compliance with insider trading laws, rules and regulations and NASDAQ listing standards.

A copy of our Policy on Securities Trading is filed as Exhibit 19.1 to this report.

A copy of our Policy on Securities Trading is included as Exhibit 19.1 to this report.

The remaining information required by this item, including information about our Directors, Executive Officers and Audit Committee will be incorporated by reference from our definitive Proxy Statement to be filed with the SEC pursuant to Regulation 14A or will be included in an amendment to this Report.

7 unchanged sentences

The information required by this item will be incorporated by reference from our definitive Proxy Statement to be filed with the SEC pursuant to Regulation 14A or will be included in an amendment to this Report.

Exhibit and Financial Statement Schedules

Exhibits and Financial Statement Schedules

(a) Documents filed as a part of this Form 10-K

38 unchanged sentences

10-Q 10/27/2015 4.3

4.5 Twenty-Fifth Supplemental Indenture, dated as of March 16, 2017, by and among T-Mobile USA, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, including the Form of 5.375% Senior Note due 2027.

8-K 3/16/2017 4.3

4.5 Thirty-Third Supplemental Indenture, dated as of January 25, 2018, by and among T-Mobile USA, Inc., T-Mobile US, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, including the Form of 4.750% Senior Note due 2028.

8-K 1/25/2018 4.2

4.7 Thirty-Fourth Supplemental Indenture, dated as of April 26, 2018, by and among T-Mobile USA, Inc., T-Mobile US, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee.

10-Q 5/1/2018 4.5

4.6 Thirty-Sixth Supplemental Indenture, dated as of April 30, 2018, by and among T-Mobile USA, Inc., T-Mobile US, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, including the Form of 4.750% Senior Note due 2028-1.

8-K 5/4/2018 4.2

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

4.9 Thirty-Seventh Supplemental Indenture, dated as of May 20, 2018, by and among T-Mobile USA, Inc., the guarantors party thereto, and Deutsche Bank Trust Company Americas.

4.7 T hirty-Seventh Supplemental Indenture, dated as of May 20, 2018, by and among T-Mobile USA, Inc., the guarantors party thereto, and Deutsche Bank Trust Company Americas.

8-K 5/21/2018 4.1

1 unchanged sentence

8-K 12/21/2018 4.1

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

4.9 Fortieth Supplemental Indenture, dated as of September 27, 2019, by and among T-Mobile USA, Inc., T-Mobile US, Inc., the other guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee.

18 unchanged sentences

10-Q 7/31/2024 4.4

4.19 Fifty-First Supplemental Indenture, dated as of March 10, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee.

10-Q 4/24/2025 4.9

4.20 Fifty-Second Supplemental Indenture, dated as of August 11, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee.

10-Q 10/23/2025 4.7

4.21 Fifty-Third Supplemental Indenture, dated as of December 31, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee.

4.22 Indenture, dated as of April 9, 2020 by and among T-Mobile USA, Inc., T-Mobile US, Inc.

1 unchanged sentence

8-K 4/13/2020 4.1

4.22 First Supplemental Indenture, dated as of April 9, 2020, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 3.500% Senior Secured Note due 2025.

8-K 4/13/2020 4.2

Incorporated by Reference

46 unchanged sentences

10-Q 7/31/2024 4.5

4.45 Twenty-Fifth Supplemental Indenture, dated as of March 10, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee.

10-Q 4/24/2025 4.8

4.46 Twenty-Sixth Supplemental Indenture, dated as of August 11, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee.

10-Q 10/23/2025 4.6

4.47 Twenty-Seventh Supplemental Indenture, dated as of December 31, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee.

4.48 Indenture, dated as of September 15, 2022 by and among T-Mobile USA, Inc., T-Mobile US, Inc.

1 unchanged sentence

8-K 9/15/2022 4.1

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

4.49 First Supplemental Indenture, dated as of September 15, 2022, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 5.200% Senior Note due 2033.

2 unchanged sentences

8-K 9/15/2022 4.3

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

4.51 Third Supplemental Indenture, dated as of September 15, 2022, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 5.800% Senior Note due 2062.

20 unchanged sentences

8-K 1/12/2024 4.3

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

4.62 Fourteenth Supplemental Indenture, dated as of January 12, 2024, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 5.500% Senior Note due 2055.

2 unchanged sentences

8-K 5/8/2024 4.2

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

4.64 Sixteenth Supplemental Indenture, dated as of May 8, 2024, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 3.700% Senior Note due 2032.

10 unchanged sentences

8-K 9/26/2024 4.4

4.70 Twenty-Second Supplemental Indenture, dated as of February 11, 2025, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 3.150% Senior Note due 2032.

8-K 2/11/2025 4.2

4.71 Twenty-Third Supplemental Indenture, dated as of February 11, 2025, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 3.500% Senior Note due 2037.

8-K 2/11/2025 4.3

4.72 Twenty-Fourth Supplemental Indenture, dated as of February 11, 2025, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 3.800% Senior Note due 2045.

8-K 2/11/2025 4.4

4.73 Twenty-Fifth Supplemental Indenture, dated as of March 10, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee.

POSASR 3/24/2025 4.8

4.74 Twenty-Sixth Supplemental Indenture, dated as of March 27, 2025, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 5.125% Senior Note due 2032.

8-K 3/27/2025 4.2

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

4.75 Twenty-Seventh Supplemental Indenture, dated as of March 27, 2025, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 5.300% Senior Note due 2035.

8-K 3/27/2025 4.3

4.76 Twenty-Eighth Supplemental Indenture, dated as of March 27, 2025, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 5.875% Senior Note due 2055.

8-K 3/27/2025 4.4

4.77 Twenty-Ninth Supplemental Indenture, dated as of August 5, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, relating to T-Mobile USA, Inc.’s 6.700% Senior Notes due 2033.

8-K 8/5/2025 4.2

4.78 Thirtieth Supplemental Indenture, dated as of August 5, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, relating to T-Mobile USA, Inc.’s 6.250% Senior Notes due 2069.

8-K 8/5/2025 4.3

4.79 Thirty-First Supplemental Indenture, dated as of August 5, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, relating to T-Mobile USA, Inc.’s 5.500% Senior Notes due March 2070.

8-K 8/5/2025 4.4

4.80 Thirty-Second Supplemental Indenture, dated as of August 5, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee, relating to T-Mobile USA, Inc.’s 5.500% Senior Notes due June 2070.

8-K 8/5/2025 4.5

4.81 Thirty-Third Supplemental Indenture, dated as of August 11, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee.

POSASR 10/6/2025 4.9

4.82 Thirty-Fourth Supplemental Indenture, dated as of October 9, 2025, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 4.625% Senior Note due 2033.

8-K 10/9/2025 4.2

4.83 Thirty-Fifth Supplemental Indenture, dated as of October 9, 2025, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 4.950% Senior Note due 2035.

8-K 10/9/2025 4.3

4.84 Thirty-Sixth Supplemental Indenture, dated as of October 9, 2025, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 5.700% Senior Note due 2056.

8-K 10/9/2025 4.4

4.85 Thirty-Seventh Supplemental Indenture, dated as of December 31, 2025, by and among T-Mobile USA, Inc., the guarantors party thereto and Deutsche Bank Trust Company Americas, as trustee .

POSASR 1/7/2026 4.10

4.86 Thirty-Eighth Supplemental Indenture, dated as of January 12, 2026, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 5.000% Senior Note due 2036.

8-K 1/12/2026 4.2

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

4.87 Thirty-Ninth Supplemental Indenture, dated as of January 12, 2026, by and among T-Mobile USA, Inc., the Guarantors (as defined therein) and Deutsche Bank Trust Company Americas, as trustee, including the Form of 5.850% Senior Note due 2056.

8-K 1/12/2026 4.3

4.88 Indenture, dated as of October 1, 1998, by and among Sprint Capital Corporation, Sprint Corporation and The Bank of New York Mellon Trust Company, N.A.

25 unchanged sentences

8-K 3/20/2023 4.1

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

4.74 Indenture, dated as of September 11, 2013, by and between Sprint Corporation and The Bank of New York Mellon Trust Company, N.A.

(SEC File No.

001-04721) 9/11/2013 4.1

4.75 Fifth Supplemental Indenture, dated as of February 22, 2018, by and among Sprint Corporation, Sprint Communications, Inc., and The Bank of New York Mellon Trust Company, N.A.

(SEC File No.

001-04721) 2/22/2018 4.1

4.76 Sixth Supplemental Indenture, dated as of May 14, 2018, by and between Sprint Corporation and The Bank of New York Mellon Trust Company, N.A.

(SEC File No.

001-04721) 5/14/2018 4.1

4.77 Eighth Supplemental Indenture, dated as of April 1, 2020, by and among Sprint Corporation, Sprint Communications, Inc., T-Mobile US, Inc., T-Mobile USA, Inc.

and The Bank of New York Mellon Trust Company, N.A., as trustee.

10-Q/A 8/10/2020 4.36

4.78 Ninth Supplemental Indenture, dated as of March 17, 2023, by and between Sprint LLC and The Bank of New York Mellon Trust Company, N.A.

8-K 3/20/2023 4.2

4.95 Indenture, dated as of October 27, 2016, by and among Sprint Spectrum Co LLC, Sprint Spectrum Co II LLC, Sprint Spectrum Co III LLC and Deutsche Bank Trust Company Americas, as Trustee and Securities Intermediary.

10 unchanged sentences

001-04721) 1/31/2019 4.1

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

4.99 Series 2018-1 Supplement, dated as of March 21, 2018 by and among Sprint Spectrum Co LLC, Sprint Spectrum Co II LLC, Sprint Spectrum Co III LLC and Deutsche Bank Trust Company Americas, as trustee and securities intermediary.

9 unchanged sentences

10-Q 8/8/2013 10.2

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

10.3 Settlement and Amendment No.

16 unchanged sentences

10-Q 8/8/2013 10.7

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

10.10 Second Amendment, dated as of October 31, 2014, to Sale Site Master Lease Agreement, dated as of November 30, 2012, by and Cook Inlet/VS GSM IV PCS Holdings, LLC, T-Mobile Central LLC, T-Mobile South LLC, Powertel/Memphis, Inc., Voicestream Pittsburgh, L.P., T-Mobile West LLC, T-Mobile Northeast LLC, Suncom Wireless Operating Company, L.L.C., T-Mobile USA, Inc., T3 Tower 1 LLC and T3 Tower 2 LLC.

2 unchanged sentences

10-K 2/7/2019 10.11

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

10.12 Management Agreement, dated as of November 30, 2012, by and among Suncom Wireless Operating Company, L.L.C., Cook Inlet/VS GSM IV PCS Holdings, LLC, T-Mobile Central LLC, T-Mobile South LLC, Powertel/Memphis, Inc., Voicestream Pittsburgh, L.P., T-Mobile West LLC, T-Mobile Northeast LLC, Wireless Alliance, LLC, Suncom Wireless Property Company, L.L.C., T-Mobile USA Tower LLC, T-Mobile West Tower LLC, CCTMO LLC, T3 Tower 1 LLC and T3 Tower 2 LLC.

19 unchanged sentences

10-Q 11/5/2020 10.1

10.20* License Purchase Agreement, dated as of July 1, 2020, by and between T-Mobile USA, Inc.

and DISH Network Corporation.

10-Q 11/5/2020 10.2

10.21* Amendment, dated as of October 15, 2023, to the License Purchase Agreement, dated as of July 1, 2020, by and between T-Mobile USA, Inc.

and DISH Network Corporation, as approved by the Court on October 23, 2023.

10-K 2/2/2024 10.21

10.22 Amended and Restated Credit Agreement, dated October 17, 2022, by and among T-Mobile USA, Inc., the lenders, swingline lenders and L/C issuers party thereto, and JPMorgan Chase Bank, N.A., as administrative agent.

10.20 Second Amended and Restated Credit Agreement, dated January 5, 2026, by and among T-Mobile USA, Inc., the lenders, swinglines lenders and L/C issuers party thereto, and JPMorgan Chase Bank, N.A., as administrative agent.

8-K 1/6/2026 10.1

5 unchanged sentences

001-04721) 11/2/2016 10.2

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

10.23 First Amendment to Intra-Company Spectrum Lease Agreement, dated as of March 12, 2018, among Sprint Spectrum License Holder, LLC, Sprint Spectrum License Holder II LLC and Sprint Spectrum License Holder III LLC, Sprint Communications, Inc., Sprint Intermediate HoldCo LLC, Sprint Intermediate HoldCo II LLC, Sprint Intermediate HoldCo III LLC.

1 unchanged sentence

001-04721) 3/12/2018 10.1

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

10.24 Second Amendment to Intra-Company Spectrum Lease Agreement, dated as of June 6, 2018, among Sprint Spectrum License Holder, LLC, Sprint Spectrum License Holder II LLC and Sprint Spectrum License Holder III LLC, Sprint Communications, Inc., Sprint Intermediate HoldCo LLC, Sprint Intermediate HoldCo II LLC, Sprint Intermediate HoldCo III LLC, Sprint Corporation and the subsidiary guarantors.

7 unchanged sentences

10-Q 7/31/2024 10.3

10.28 Guarantee Assumption Agreement, dated as of March 10, 2025, by and among Sprint Spectrum License Holder LLC, Sprint Spectrum License Holder II LLC, Sprint Spectrum License Holder III LLC and certain subsidiary guarantors.

10-Q 4/24/2025 10.3

10.29 Guarantee Assumption Agreement, dated as of August 11, 2025, by and among Sprint Spectrum License Holder LLC, Sprint Spectrum License Holder II LLC, Sprint Spectrum License Holder III LLC and certain subsidiary guarantors.

10-Q 10/23/2025 10.5

10.30 Guarantee Assumption Agreement, dated as of December 31, 2025, by and among Sprint Spectrum License Holder LLC, Sprint Spectrum License Holder II LLC, Sprint Spectrum License Holder III LLC and certain subsidiary guarantors.

10.31 Master Framework Agreement, dated as of June 22, 2020, by and among SoftBank Group Corp., SoftBank Group Capital Ltd, Delaware Project 4 L.L.C., Delaware Project 6 L.L.C., Claure Mobile LLC, Deutsche Telekom AG, T-Mobile US, Inc.

7 unchanged sentences

10-Q 10/25/2023 10.1

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

10.35* Amended and Restated License Purchase Agreement, dated as of March 30, 2023, by and among T-Mobile USA, Inc., T-Mobile License LLC, Nextel West Corp., and LB License Co, LLC.

6 unchanged sentences

10-Q 4/27/2023 10.6

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

10.39* License Purchase Agreement, dated as of September 12, 2023, by and among T-Mobile USA, Inc., T-Mobile License LLC, T-Mobile US, Inc., Comcast OTR1, LLC, and Comcast Corporation.

1 unchanged sentence

10.40 First Amendment to License Purchase Agreement and Long-term Spectrum Manager Lease Agreement, dated as of January 10, 2025, by and among T-Mobile USA, Inc., T-Mobile License LLC, T-Mobile US, Inc., Comcast OTR1, LLC, and Comcast Corporation.

10.40** Amended and Restated Employment Agreement, dated as of March 9, 2023, by and between the Company and G.

Michael Sievert.

10-Q 4/27/2023 10.2

10.41* Form of Indemnification and Advancement Agreement.

10-K 1/31/2025 10.39

10.42** Amended and Restated T-Mobile US, Inc.

Non-Qualified Deferred Executive Compensation Plan.

10-Q 7/31/2024 10.2

10.43** T-Mobile US, Inc.

Executive Continuity Plan as Amended and Restated Effective as of January 1, 2014.

10.41* Form of Indemnification and Advancement Agreement.

10-K 2/8/2018 10.76

5 unchanged sentences

Schedule 14A 4/26/2018 Annex A

10.46** Annual Incentive Award Notice under the 2013 Omnibus Incentive Plan.

10-Q 5/4/2021 10.4

10.44** T-Mobile US, Inc.

Amended and Restated 2014 Employee Stock Purchase Plan .

Schedule 14A 4/28/2023 Annex B

10.48** Sprint Corporation 2007 Omnibus Incentive Plan.

(SEC File No.

001-04721) 9/20/2013 10.2

10.49** Sprint Corporation Amended and Restated 2015 Omnibus Incentive Plan.

(SEC File No.

001-04721) 2/6/2017 10.1

10.50** T-Mobile US, Inc.

2023 Incentive Award Plan.

Schedule 14A 4/28/2023 Annex A

10.51** Form of Sprint Corporation Award Agreement (awarding stock options) under the Sprint Corporation 2015 Amended and Restated Omnibus Incentive Plan.

(SEC File No.

001-04721) 8/3/2017 10.3

10.52** Form of Restricted Stock Unit Award Agreement (Time-Vesting) for Executive Officers under the Sprint Corporation 2015 Amended and Restated Omnibus Incentive Plan.

10-Q 5/4/2021 10.1

10.53** Form of Restricted Stock Unit Award Agreement (Performance-Vesting) for Executive Officers under the Sprint Corporation 2015 Amended and Restated Omnibus Incentive Plan.

10.45** Form of Annual Incentive Award Notice under the 2023 Incentive Award Plan.

10.46** Form of Restricted Stock Unit Award Agreement (Time- Based Vesting) for Executive Officers under the T-Mobile US, Inc.

2013 Omnibus Incentive Plan.

10-Q 5/6/2020 10.7

10.54** Form of Restricted Stock Unit Award Agreement (Time-Vesting) for Executive Officers under the T-Mobile US, Inc.

10.47** Form of Restricted Stock Unit Award Agreement (Performance- Based Vesting) (Stock Settled) for Executive Officers under the T-Mobile US, Inc.

2013 Omnibus Incentive Plan.

10-Q 5/6/2020 10.8

10.55** Form of Restricted Stock Unit Award Agreement (Performance-Vesting) (Stock Settled) for Executive Officers under the T-Mobile US, Inc.

10.48** Form of Restricted Stock Unit Award Agreement (Performance- Based Vesting) (Cash Settled) for Executive Officers under the T-Mobile US, Inc.

2013 Omnibus Incentive Plan.

10-Q 5/4/2021 10.3

10.49** Form of Restricted Stock Unit Award Agreement (Time- Based Vesting) for Executive Officers under the T-Mobile US, Inc.

2023 Incentive Award Plan.

10.50** Form of Restricted Stock Unit Award Agreement (Performance- Based Vesting) (Stock Settled) for Executive Officers under the T-Mobile US, Inc.

2023 Incentive Award Plan.

10.51** Form of Restricted Stock Unit Award Agreement (Performance- Based Vesting) (Cash-Settled) for Executive Officers under the T-Mobile US, Inc.

2023 Incentive Award Plan.

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

10.52** Form of LTI Award Letter Agreement .

10-Q 4/24/2025 10.1

10.53** Form of PRSU Award Agreement (Transformation Award).

10-Q 7/23/2025 10.1

10.54** Amended Director Compensation Program effective as of May 1, 2013 (amended June 4, 2014 and further amended on June 1, 2015, June 16, 2016, June 13, 2017, June 13, 2019, June 4, 2020, June 13, 2024 and June 6, 2025).

10-Q 7/23/2025 10.2

10.55** Form of Restricted Stock Unit Award Agreement for Non-Employee Directors under the T-Mobile US, Inc.

4 unchanged sentences

10-Q 7/27/2023 10.4

10.58** Form of Restricted Stock Unit Award Agreement (Performance-Vesting) (Cash Settled) for Executive Officers under the T-Mobile US, Inc.

2013 Omnibus Incentive Plan.

10.57** T-Mobile US, Inc.

Amended and Restated 2014 Employee Stock Purchase Plan.

Schedule 14A 4/28/2023 Annex B

10.58** Amended and Restated T-Mobile US, Inc.

Non-Qualified Deferred Executive Compensation Plan.

10-Q 7/31/2024 10.2

10.59** Form of Restricted Stock Unit Award Agreement (Time-Vesting) for Executive Officers under the T-Mobile US, Inc.

2023 Incentive Award Plan .

10.59** T-Mobile US, Inc.

Executive Continuity Plan as Amended and Restated Effective as of January 1, 2014.

8-K 10/25/2013 10.1

10.60** Amended and Restated Employment Agreement, dated as of September 19, 2025, by and between the Company and Srinivasan Gopalan .

10-Q 10/23/2025 10.1

10.60** Form of Restricted Stock Unit Award Agreement (Performance-Vesting) (Stock Settled) for Executive Officers under the T-Mobile US, Inc.

2023 Incentive Award Plan .

10.61** Amended and Restated Employment Agreement, dated as of March 9, 2023, by and between the Company and G.

Michael Sievert.

10-Q 4/27/2023 10.2

10.61** Form of Restricted Stock Unit Award Agreement (Performance-Vesting) (Cash-Settled) for Executive Officers under the T-Mobile US, Inc.

2023 Incentive Award Plan .

10.62** Amendment, dated as of September 19, 2025, to Amended and Restated Employment Agreement, dated as of March 9, 2023, by and between the Company and G.

Michael Sievert.

10-Q 10/23/2025 10.2

10.62** Amended Director Compensation Program effective as of May 1, 2013 (amended June 4, 2014 and further amended on June 1, 2015, June 16, 2016, June 13, 2017, June 13, 2019, June 4, 2020 and June 13, 2024).

10.63** Compensation Term Sheet, dated as of March 18, 2025, by and between T-Mobile US, Inc.

and Michael J.

10-Q 4/24/2025 10.2

10.64** Amendment, dated as of September 19, 2025, to Compensation Term Sheet, dated as of March 18, 2025, by and between T-Mobile US, Inc.

and Michael J.

10-Q 10/23/2025 10.4

10.65** Employment Agreement, effective October 11, 2021, between T-Mobile US, Inc.

1 unchanged sentence

10-Q 5/6/2022 10.1

10.64A** Compensation Term Sheet, dated as of September 12, 2024, by and between T-Mobile US, Inc.

10.66** Compensation Term Sheet, dated as of September 12, 2024, by and between T-Mobile US, Inc.

and Peter Osvaldik.

10-Q 10/23/2024 10.1

10.67** Amendment, dated as of September 19, 2025, to Compensation Term Sheet, dated as of September 12, 2024, by and between T-Mobile US, Inc.

and Peter Osvaldik.

10-Q 10/23/2025 10.3

10.68** Letter Agreement, dated as of December 8, 2025, by and between T-Mobile US, Inc.

and Jonathan A.

10.69** Form of Retirement Agreement.

19.1 T-Mobile US, Inc.

Policy on Securities Trading .

10-K 1/31/2025 19.1

19.2 Frequently Asked Questions Rule 10b5-1 Trading Plans .

10-K 1/31/2025 19.2

21.1 Subsidiaries of Registrant.

4 unchanged sentences

31.2 Certifications of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

32.1*** Certification of Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

8 unchanged sentences

101.LAB XBRL Taxonomy Extension Label Linkbase Document.

Incorporated by Reference

Exhibit Description Form Date of Filing Exhibit Number Included Herewith

101.PRE XBRL Taxonomy Extension Presentation Linkbase Document.

7 unchanged sentences

T-MOBILE US, INC.

January 31, 2025 /s/ G.

Michael Sievert

February 11, 2026 /s/ Srinivasan Gopalan

Srinivasan Gopalan

Chief Executive Officer

Each person whose signature appears below constitutes and appoints G.

Michael Sievert and Peter Osvaldik, and each or any of them, his or her true and lawful attorney-in-fact and agent, each acting alone, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any or all amendments or supplements (including post-effective amendments) to this Report, and to file the same, with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorney-in-fact and agent, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorney-in-fact and agent, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated as of January 31, 2025.

Each person whose signature appears below constitutes and appoints Srinivasan Gopalan and Peter Osvaldik, and each or any of them, his or her true and lawful attorney-in-fact and agent, each acting alone, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any or all amendments or supplements (including post-effective amendments) to this Report, and to file the same, with all exhibits thereto, and all documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorney-in-fact and agent, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorney-in-fact and agent, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

Signature Title

Michael Sievert Chief Executive Officer and

Michael Sievert Director (Principal Executive Officer)

/s/ Peter Osvaldik Executive Vice President and Chief Financial Officer

/s/ Srinivasan Gopalan Chief Executive Officer and

Srinivasan Gopalan Director (Principal Executive Officer)

/s/ Peter Osvaldik Chief Financial Officer

Peter Osvaldik (Principal Financial Officer)

/s/ Dara Bazzano Senior Vice President, Finance and Chief Accounting

Dara Bazzano Officer (Principal Accounting Officer)

/s/ Daniel J.

Drobac Vice President and Chief Accounting Officer

Drobac (Principal Accounting Officer)

/s/ Timotheus Höttges Chairman of the Board

Timotheus Höttges

/s/ André Almeida Director

André Almeida

Michael Sievert Vice Chairman and Vice Chairman of the Board

Michael Sievert

/s/ Marcelo Claure Director

2 unchanged sentences

Datar Director

/s/ Srinivasan Gopalan Director

Srinivasan Gopalan

/s/ Thomas Dannenfeldt Director

Thomas Dannenfeldt

/s/ Christian P.

9 unchanged sentences

Long Director

/s/ Abdurazak Mudesir Director

Abdurazak Mudesir

/s/ Teresa A.

Taylor Director

/s/ Kelvin R.

Westbrook Director

Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.

What changed 10-K

Item 9A. Controls and Procedures