TMUS Form 144 Discloses 5M-Share Block Trade, Multiple 10b5-1 Sales

Rhea-AI Filing Summary

T-Mobile US, Inc. (Form 144) notice reports a proposed sale of 5,000,000 shares of common stock through Santander US Capital Markets on 09/11/2025 on NASDAQ, with an aggregate market value listed as $1,201,900,000. The filing shows these shares were acquired on 05/31/2001 in a merger or acquisition from the issuer. The company reports total shares outstanding of 1,125,419,038, so the proposed block represents a small fraction of outstanding stock. The filing also discloses numerous prior 10b5-1 sales by Deutsche Telekom Holding B.V. over the past three months, showing a pattern of executed automated sales and providing transparency about recent insider/affiliate dispositions.

Positive

• Complete disclosure of proposed sale including broker, date, number of shares, exchange, and aggregate market value
• Acquisition history provided (shares acquired 05/31/2001 via merger/acquisition), supporting transparency on origin of holdings
• Extensive 10b5-1 sale history disclosed for the past three months, increasing visibility into recent insider/affiliate dispositions

Negative

• Large single proposed block of 5,000,000 shares with aggregate market value of $1,201,900,000 may put downward pressure on supply on the trade date
• Frequent 10b5-1 sales by an affiliate disclosed over the past three months indicate ongoing sales activity that could influence market dynamics

Insights

Securities Analyst

TL;DR: A disclosed proposed sale of 5.0M shares is compliant and appears modest relative to total outstanding shares.

The Form 144 identifies a single proposed block trade of 5,000,000 shares via Santander US Capital Markets on 09/11/2025, with an aggregate market value of $1,201,900,000. Compared with total outstanding shares of 1,125,419,038, the block is approximately 0.44% of the outstanding base, indicating the sale is not a controlling disposal. The filing also documents multiple recent 10b5-1 sales by Deutsche Telekom Holding B.V., signaling ongoing, systematic dispositions rather than a one-off liquidation. From a securities-disclosure perspective, the filing is thorough and actionable for market participants.

Corporate Governance Expert

TL;DR: Repeated 10b5-1 sales and a large scheduled block warrant governance attention despite compliance with Rule 144 reporting.

The notice confirms the seller acquired the shares in 2001 through a merger/acquisition and is now proposing a significant sale on 09/11/2025. The record of numerous recent 10b5-1 transactions by an affiliate—each disclosed with dates and proceeds—suggests management or major shareholders are actively monetizing positions under prearranged plans. While the Form 144 meets regulatory reporting requirements, such concentrated and repeated dispositions can raise governance questions about shareholder concentration shifts and should be monitored alongside other public disclosures.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	Santander US Capital Markets LLC 437 Madison Avenue New York NY 10022	5000000	1201900000	1125419038	09/11/2025	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	05/31/2001	Merger or Acquisition	Issuer			5000000	05/31/2001	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/12/2025	69840	15975879.05
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/13/2025	69840	15920349.26
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/16/2025	69840	16074507.1
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/17/2025	69840	15466556.88
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/18/2025	69840	15481432.8
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/20/2025	69840	15490428.19
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/23/2025	69840	15755910.98
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/24/2025	69840	16018656.05
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/25/2025	69840	16102093.9
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/26/2025	69840	16106018.9
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/27/2025	69840	16402936.68
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	06/30/2025	69840	16594437.96
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/01/2025	69840	16866122.54
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/02/2025	69840	16614426.17
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/03/2025	69840	16734460.18
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/07/2025	69840	16627458.31
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/08/2025	69840	16449233.62
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/09/2025	69840	16222065.05
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/10/2025	69840	15961024.08
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/11/2025	69840	15892273.58
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/14/2025	69840	15947384.33
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/15/2025	69840	15794371.87
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/16/2025	69840	15943263.77
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/17/2025	69840	15877125.29
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/18/2025	69840	15862912.85
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/21/2025	69840	16243338.31
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/22/2025	69840	16316726.18
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/23/2025	69840	16246928.09
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/24/2025	69840	17344072.58
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/25/2025	69840	17109249.55
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/28/2025	69840	16664466.53
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/29/2025	69840	16711063.78
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/30/2025	69840	16837355.45
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	07/31/2025	69840	16739781.98
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/01/2025	69840	16613734.75
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/04/2025	69840	16708605.41
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/05/2025	69840	16695056.45
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/06/2025	69840	16741220.69
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastri P7 6221	Common Stock	08/07/2025	69840	16847845.42
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/08/2025	69840	17124341.98
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/11/2025	69840	17287781.54
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/12/2025	69840	17534344.68
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/13/2025	69840	17566128.86
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/14/2025	69840	17520676.99
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/15/2025	69840	17756072.71
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/18/2025	69840	17841445.13
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/19/2025	69840	17965096.85
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/20/2025	69840	18149404.61
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/21/2025	69840	18027177.62
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/22/2025	69840	17794638.36
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/25/2025	69840	17552000.23
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/26/2025	69840	17507239.78
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/27/2025	69840	17554018.61
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/28/2025	69840	17496631.08
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	08/29/2025	69840	17545798.44
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	09/02/2025	69840	17909902.3
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	09/03/2025	69840	17634362.54
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	09/04/2025	69840	17665050.24
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	09/05/2025	69840	17674499.59
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	09/08/2025	69840	17003860.99
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	09/09/2025	69840	16932505.46
10b5-1 Sales for Deutsche Telekom Holding B.V. Stationsplein 8K BT Maastricht P7 6221	Common Stock	09/10/2025	69840	16767250.06

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What is the size and timing of the proposed sale in the TMUS Form 144?

The filing proposes to sell 5,000,000 shares of common stock on 09/11/2025 on NASDAQ through Santander US Capital Markets.

What aggregate market value is reported for the proposed TMUS sale?

The Form 144 lists an aggregate market value of $1,201,900,000 for the 5,000,000 shares to be sold.

When and how were the shares being sold originally acquired?

The securities were acquired on 05/31/2001 through a merger or acquisition from the issuer, per the filing.

Does the filing show recent sales of TMUS shares by related parties?

Yes. The document discloses numerous 10b5-1 sales by Deutsche Telekom Holding B.V. across June–September 2025 with specific dates, amounts, and gross proceeds.

How large is the proposed block relative to total TMUS shares outstanding?

The filing reports 1,125,419,038 shares outstanding; the proposed 5,000,000 shares represent approximately 0.44% of that total.