T-Mobile (TMUS) Form 4: 2,500-share sale by officer under 10b5-1 plan

Rhea-AI Filing Summary

Insider sale by T-Mobile US officer. Michael J. Katz, President, Marketing Strategy & Products at T-Mobile US (TMUS), reported the sale of 2,500 shares of common stock on 08/15/2025 at a price of $251.12 per share. After this transaction he beneficially owned 158,702.521 shares, held directly. The filing notes the sale was effected under a Rule 10b5-1 trading plan adopted by the reporting person on November 6, 2024. The Form 4 was signed by an attorney-in-fact on 08/18/2025.

Positive

• Transaction disclosed as executed under a Rule 10b5-1 trading plan, supporting compliance with insider-trading safeguards
• Reporter retains substantial ownership after the sale (158,702.521 shares), indicating ongoing alignment with shareholder interests
• Clear, complete Form 4 disclosure including transaction date, price, and signature by attorney-in-fact

Negative

• Disposition of shares (2,500 shares sold) reduces the reporting person's stake, though not materially
• Sale price disclosed ($251.12) could be interpreted by some market participants but filing contains no commentary or context

Insights

Securities Compliance Analyst

TL;DR: A routine, pre-planned insider sale under a 10b5-1 plan; documentation aligns with expected compliance practice.

The filing documents a small-volume disposition of 2,500 shares executed under a Rule 10b5-1 trading plan adopted on November 6, 2024. The explicit statement that the transaction was pursuant to a 10b5-1 plan is important for demonstrating an affirmative defense to insider trading claims. The amount sold represents a de minimis portion of the reporting person’s total beneficial holdings of 158,702.521 shares, and the transaction price of $251.12 is disclosed. No amendment or additional derivative transactions are reported.

Corporate Governance Specialist

TL;DR: Insider sale is small relative to holdings and appears procedural rather than material.

The sale of 2,500 shares is modest relative to the reported beneficial ownership and was executed under an established trading plan, which typically reduces governance concerns. The Form 4 includes the required disclosure of relationship to issuer and confirms direct ownership. There is no indication of related-party transactions, option exercises, or other unusual transfers in this filing. Documentation was signed by an attorney-in-fact, which is common for timely filing.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Katz Michael J.

(Last) (First) (Middle)

C/O T-MOBILE US, INC.

12920 SE 38TH STREET

(Street)

BELLEVUE WA 98006

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
T-Mobile US, Inc. [ TMUS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Pres, Mkting Stgy & Prods

3. Date of Earliest Transaction (Month/Day/Year)
08/15/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/15/2025		S		2,500(1)	D	$251.12	158,702.521	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 6, 2024.

Remarks:

	/s/ Frederick Williams, Attorney-in-Fact	08/18/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Michael J. Katz sell according to the TMUS Form 4?

He sold 2,500 shares of T-Mobile US common stock on 08/15/2025 at a price of $251.12 per share.

Was the sale by Michael J. Katz part of a planned trading program?

Yes. The Form 4 states the transaction was effected pursuant to a Rule 10b5-1 trading plan adopted on November 6, 2024.

How many TMUS shares did the reporting person own after the transaction?

The filing reports beneficial ownership of 158,702.521 shares following the sale.

Who signed the Form 4 for Michael J. Katz?

The Form 4 was signed by Frederick Williams, Attorney-in-Fact on 08/18/2025.

Does the Form 4 report any derivative transactions or option exercises?

No. Table II (derivative securities) shows no reported derivative transactions in this filing.