# EDGAR Filing Document

**Accession Number:** 0001283699
**File Stem:** 0001193125-25-177205
**Filing Date:** 2025-8
**Character Count:** 20103
**Document Hash:** 8aacc4928d9f7c78f77f557e5d7e69a5
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-177205.hdr.sgml**: 20250808

**ACCESSION NUMBER**: 0001193125-25-177205

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250808

**DATE AS OF CHANGE**: 20250808

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** T-Mobile US, Inc.
- **CENTRAL INDEX KEY:** 0001283699
- **STANDARD INDUSTRIAL CLASSIFICATION:** RADIO TELEPHONE COMMUNICATIONS [4812]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 200836269
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-83639
- **FILM NUMBER:** 251199881

**BUSINESS ADDRESS:**
- **STREET 1:** 12920 SE 38TH STREET
- **CITY:** BELLEVUE
- **STATE:** WA
- **ZIP:** 98006
- **BUSINESS PHONE:** 800-318-9270

**MAIL ADDRESS:**
- **STREET 1:** 12920 SE 38TH STREET
- **CITY:** BELLEVUE
- **STATE:** WA
- **ZIP:** 98006

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** METROPCS COMMUNICATIONS INC
- **DATE OF NAME CHANGE:** 20040315
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SoftBank Group Capital Ltd
- **CENTRAL INDEX KEY:** 0001755163

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** X0
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** 69 GROSVENOR STREET
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** WIK 3JP
- **BUSINESS PHONE:** 650-562-8211

**MAIL ADDRESS:**
- **STREET 1:** 69 GROSVENOR STREET
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** WIK 3JP

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 18)**

**T-Mobile US, Inc.**

*(Name of Issuer)*

**Common Stock**

*(Title of Class of Securities)*

**872590104**

*(CUSIP Number)*

**Kenneth A. Siegel, Esq.**<br>Shin-Marunouchi Building, 29th Floor<br>5-1, Marunouchi 1-Chome<br>Chiyoda-ku, Tokyo M0 100-6529<br>81-3-3214-6522

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**08/06/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **872590104** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**SoftBank Group Capital Limited** | Name of reporting person<br>**SoftBank Group Capital Limited** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**—** | Source of funds (See Instructions)<br>**—** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X0** | Citizenship or place of organization<br>**X0** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**0.00** | Aggregate amount beneficially owned by each reporting person<br>**0.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0.00%** | Percent of class represented by amount in Row (11)<br>**0.00%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

| **CUSIP No.** | **872590104** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Delaware Project 4 L.L.C.** | Name of reporting person<br>**Delaware Project 4 L.L.C.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**—** | Source of funds (See Instructions)<br>**—** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**0.00** | Aggregate amount beneficially owned by each reporting person<br>**0.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0.00%** | Percent of class represented by amount in Row (11)<br>**0.00%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **872590104** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Delaware Project 6 L.L.C.** | Name of reporting person<br>**Delaware Project 6 L.L.C.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**—** | Source of funds (See Instructions)<br>**—** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**32861065.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**32861065.00** | Aggregate amount beneficially owned by each reporting person<br>**32861065.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**2.92%** | Percent of class represented by amount in Row (11)<br>**2.92%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** (1)	Based on the number of shares of Common Stock outstanding on July 18, 2025, as reported by the Issuer in its Quarterly Report on Form 10-Q, filed with the Commission on July 23, 2025.

(The terms used above are defined in the Explanatory Note of this Schedule 13D).

| **CUSIP No.** | **872590104** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Delaware Project 9 L.L.C.** | Name of reporting person<br>**Delaware Project 9 L.L.C.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**—** | Source of funds (See Instructions)<br>**—** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**18000000.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**18000000.00** | Aggregate amount beneficially owned by each reporting person<br>**18000000.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**1.60%** | Percent of class represented by amount in Row (11)<br>**1.60%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** (1)	Based on the number of shares of Common Stock outstanding on July 18, 2025, as reported by the Issuer in its Quarterly Report on Form 10-Q, filed with the Commission on July 23, 2025.

(The terms used above are defined in the Explanatory Note of this Schedule 13D).

| **CUSIP No.** | **872590104** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**SoftBank Group Corp.** | Name of reporting person<br>**SoftBank Group Corp.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**—** | Source of funds (See Instructions)<br>**—** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**M0** | Citizenship or place of organization<br>**M0** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**50861065.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**50861065.00** | Aggregate amount beneficially owned by each reporting person<br>**50861065.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.52%** | Percent of class represented by amount in Row (11)<br>**4.52%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**HC** | Type of Reporting Person (See Instructions)<br>**HC** | |

---

**Comment for Reporting Person:** (1)	As of the date hereof, the shares of Common Stock are held by Project 6 LLC, a wholly owned subsidiary of SoftBank, and Project 9 LLC, a wholly owned subsidiary of SoftBank; the shares of Common Stock held by Project 6 LLC and Project 9 LLC are subject to the Proxy Agreement.
(2)	Based on the number of shares of Common Stock outstanding on July 18, 2025, as reported by the Issuer in its Quarterly Report on Form 10-Q, filed with the Commission on July 23, 2025.

(The terms used above are defined in the Explanatory Note of this Schedule 13D).

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock

**(b) Name of Issuer:**
T-Mobile US, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
12920 SE 38TH STREET, BELLEVUE, WA, 98006

EXPLANATORY NOTE

This Amendment No. 18 (this "Schedule 13D Amendment") to the Schedule 13D filed with the U.S. Securities and Exchange Commission (the "Commission") on April 2, 2020, as amended and supplemented by Amendment No. 1 to the Schedule 13D filed with the Commission on June 15, 2020, Amendment No. 2 to the Schedule 13D filed with the Commission on June 25, 2020, Amendment No. 3 to the Schedule 13D filed with the Commission on June 26, 2020, Amendment No. 4 to the Schedule 13D filed with the Commission on July 30, 2020, Amendment No. 5 to the Schedule 13D filed with the Commission on October 6, 2020, Amendment No. 6 to the Schedule 13D filed with the Commission on September 7, 2021, Amendment No. 7 to the Schedule 13D filed with the Commission on September 9, 2021, Amendment No. 8 to the Schedule 13D filed with the Commission on September 16, 2021, Amendment No. 9 to the Schedule 13D filed with the Commission on September 28, 2021, Amendment No. 10 to the Schedule 13D filed with the Commission on February 4, 2022, Amendment No. 11 to the Schedule 13D filed with the Commission on March 29, 2022, Amendment No. 12 to the Schedule 13D filed with the Commission on April 13, 2022, Amendment No. 13 to the Schedule 13D filed with the Commission on June 6, 2023, Amendment No. 14 to the Schedule 13D filed with the Commission on December 26, 2023, Amendment No. 15 to the Schedule 13D filed with the Commission on June 11, 2024, Amendment No. 16 to the Schedule 13D filed with the Commission on July 2, 2024 and Amendment No. 17 to the Schedule 13D filed with the Commission on June 20, 2025 (as amended and supplemented, this "Schedule 13D"), is being filed on behalf of SoftBank Group Corp., a Japanese kabushiki kaisha ("SoftBank"), its wholly owned subsidiary SoftBank Group Capital Limited, a private limited company incorporated in England and Wales ("SBGC"), SoftBank's wholly owned subsidiary Delaware Project 6 L.L.C., a Delaware limited liability company ("Project 6 LLC"), SoftBank's wholly owned subsidiary, Delaware Project 4 L.L.C., a Delaware limited liability company ("Project 4 LLC"), and SoftBank's wholly owned subsidiary, Delaware Project 9, L.L.C., a Delaware limited liability company ("Project 9 LLC," and together with SoftBank, SBGC, Project 6 LLC and Project 4 LLC, the "Reporting Persons"), with respect to the common stock of T-Mobile US, Inc., a Delaware corporation ("T-Mobile" or the "Issuer"), par value $0.00001 per share (the "Common Stock").

Other than as set forth below, all Items in the Schedule 13D are materially unchanged. Capitalized terms used in this Schedule 13D Amendment which are not defined herein have the meanings given to them in this Schedule 13D.

**Item 4. Purpose of Transaction**

Item 4 of the Schedule 13D is hereby amended to include the following:

On August 6, 2025, Project 4 LLC, Project 6 LLC and Project 9 LLC collectively sold an aggregate of 13,000,000 shares of Common Stock in an unregistered block sale transaction with an unaffiliated broker dealer pursuant to Rule 144 under the Securities Act of 1933, as amended (the "Block Sale") for net proceeds of approximately $3.02 billion, representing approximately 1.16% of the shares of Common Stock outstanding as of July 18, 2025, as reported by the Issuer in its Quarterly Report on Form 10-Q, filed with the Commission on July 23, 2025. Project 4 LLC sold 3,566,400 shares of Common Stock, Project 6 LLC sold 182,043 shares of Common Stock and Project 9 LLC sold 9,251,557 shares of Common Stock.

The Block Sale was undertaken as part of the Reporting Persons' normal course evaluation of their investment. Although the Reporting Persons do not have any specific plan or proposal to effect further sales of shares of Common Stock at the time of this filing, the Reporting Persons intend to monitor and evaluate their investment on an ongoing basis.

As a result of the Block Sale, the Reporting Persons no longer collectively beneficially own greater than five percent of the number of shares of Common Stock outstanding and therefore this Amendment No. 18 represents the final amendment to the Schedule 13D and the Reporting Persons shall cease to be Reporting Purposes immediately after the filing of this Amendment No. 18.

**Item 5. Interest in Securities of the Issuer**

**(a)**
Item 5 of the Schedule 13D is hereby amended to include the following:
The information contained in the cover pages of this Schedule 13D is incorporated herein by reference.

**(b)**
The information contained in the cover pages of this Schedule 13D is incorporated herein by reference.

**(c)**
The information contained in Item 4 of this Schedule 13D is herein incorporated by reference. Other than as set forth in this Schedule 13D Amendment, none of the Reporting Persons nor, to the best of each Reporting Person's knowledge, any person on Appendix A-1, Appendix A-2, Appendix A-3, Appendix A-4 or Appendix A-5 (each as previously filed with the Schedule 13D), has engaged in any transaction in any shares of Common Stock since the filing of Amendment No. 17 to the Schedule 13D on June 20, 2025.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** SoftBank Group Capital Limited

**Signature:** /s/ Stephen Lam

**Name/Title:** Stephen Lam, Director

**Date:** 08/08/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Delaware Project 4 L.L.C.

**Signature:** /s/ Hugh Manahan

**Name/Title:** Hugh Manahan, Manager

**Date:** 08/08/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Delaware Project 6 L.L.C.

**Signature:** /s/ Hugh Manahan

**Name/Title:** Hugh Manahan, Manager

**Date:** 08/08/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Delaware Project 9 L.L.C.

**Signature:** /s/ Hugh Manahan

**Name/Title:** Hugh Manahan, Manager

**Date:** 08/08/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** SoftBank Group Corp.

**Signature:** /s/ Yuko Yamamoto

**Name/Title:** Yuko Yamamoto, Head of Corporate Legal Department

**Date:** 08/08/2025