TMUS Insider Sale: Michael Sievert Disposes 45,000 Shares at ~$256

Rhea-AI Filing Summary

Michael G. Sievert, President and Chief Executive Officer and a director of T-Mobile US, Inc. (TMUS), reported sales of company common stock pursuant to a Rule 10b5-1 trading plan. The filing shows two dispositions: 22,500 shares sold on 08/18/2025 at a weighted average price of $255.58 (individual trades ranged $254.64–$256.72) and 22,500 shares sold on 08/19/2025 at a weighted average price of $257.17 (individual trades ranged $254.45–$258.42). After the 08/18 sale the filing reports beneficial ownership of 358,721.576 shares; after the 08/19 sale beneficial ownership is reported as 336,221.576 shares. The transactions were effected under a 10b5-1 plan adopted November 14, 2024, and the Form 4 was signed by an attorney-in-fact on 08/20/2025.

Positive

• Sales executed under a Rule 10b5-1 plan, indicating the transactions were preplanned and intended to provide affirmative defense
• Filing discloses weighted average prices and trade price ranges, enhancing transaction transparency
• Prompt reporting with an attorney-in-fact signature on the Form 4

Negative

• Insider reduced holdings by 45,000 shares, with beneficial ownership reported at 336,221.576 shares after the second sale
• Large insider sales may attract market scrutiny despite being preplanned

Insights

Corporate Governance Expert

TL;DR: CEO stock sales were executed under a preplanned 10b5-1 arrangement, showing procedural compliance but reducing insider holdings.

The Form 4 discloses routine, prearranged sales by the CEO under a Rule 10b5-1 plan adopted on November 14, 2024. Reporting the weighted average prices and the full ranges of execution enhances transparency. The filing documents a decline in the CEO's beneficial stake to 336,221.576 shares after the second sale. From a governance perspective, use of a 10b5-1 plan and prompt Form 4 reporting aligns with good disclosure practices; however, repeated sizeable sales by an executive can attract investor attention even if lawful and planned.

Securities Analyst

TL;DR: Materiality appears limited to disclosure; two sales totaling 45,000 shares were executed at mid-$250s prices.

The transactions total 45,000 shares sold across two trading dates at weighted average prices of $255.58 and $257.17. These specifics allow investors to quantify the cash realized by the reporting person if desired and confirm adherence to a documented trading plan. The filing does not include any derivative activity or other compensatory transactions, and no additional information about prior ownership concentration or percentage ownership is provided beyond the post-sale share counts.

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^*

SIEVERT G MICHAEL

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
08/18/2025

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	08/18/2025		S		22,500(1)	D	$255.58(2)	358,721.576	D
Common Stock	08/19/2025		S		22,500(1)	D	$257.17(3)	336,221.576	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 14, 2024.

2. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $254.64 to $256.72. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold at each separate price within the range set forth on this footnote.

3. The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $254.45 to $258.42. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold at each separate price within the range set forth on this footnote.

Remarks:

	/s/ Frederick Williams, Attorney-in-Fact	08/20/2025
	** 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 TMUS CEO Michael Sievert report on Form 4?

The Form 4 reports that Michael G. Sievert sold 22,500 shares on 08/18/2025 and 22,500 shares on 08/19/2025 pursuant to a Rule 10b5-1 trading plan.

At what prices were the TMUS shares sold by the CEO?

The sales were reported at weighted average prices of $255.58 (08/18/2025) and $257.17 (08/19/2025) with trade ranges disclosed in the filing.

How many TMUS shares does Michael Sievert beneficially own after these transactions?

The filing reports beneficial ownership of 358,721.576 shares after the 08/18 sale and 336,221.576 shares after the 08/19 sale.

Were the transactions part of an insider trading plan?

Yes. The transactions were effected under a 10b5-1 trading plan adopted on November 14, 2024 as stated in the Form 4.

Who signed the Form 4 for the reporting person?

The Form 4 bears the signature of Frederick Williams, Attorney-in-Fact, dated 08/20/2025.