T-Mobile US, Inc.
MX ˙ BMV ˙ US8725901040
SecurityMX:TMUS / T-Mobile US, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership23,719,298 shares
Latest Disclosed Value $ 4,981,764,159
State Street Corp reports 6.18% decrease in ownership of TMUS / T-Mobile US, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 23,719,298 shares of T-Mobile US, Inc. (MX:TMUS) valued at $4,981,764,159 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 25,281,709 shares of T-Mobile US, Inc.. This represents a change in shares of -6.18% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F T-MOBILE US COM 872590104 23,719,298 -1,562,411 -6.18 4,981,764 -2.95 0.1720
2026-02-13 2025-12-31 13F T-MOBILE US COM 872590104 25,281,709 1,047,624 4.32 5,133,198 -11.51 0.1722
2025-11-14 2025-09-30 13F T-MOBILE US COM 872590104 24,234,085 1,092,769 4.72 5,801,155 5.21 0.2012
2025-08-14 2025-06-30 13F T-MOBILE US COM 872590104 23,141,316 994,740 4.49 5,513,650 -6.65 0.2067
2025-05-15 2025-03-31 13F T-MOBILE US COM 872590104 22,146,576 -766,145 -3.34 5,906,713 16.79 0.2434
2025-02-14 2024-12-31 13F T-MOBILE US COM 872590104 22,912,721 447,020 1.99 5,057,515 9.09 0.1995
2024-11-14 2024-09-30 13F T-MOBILE US COM 872590104 22,465,701 -1,200,785 -5.07 4,636,022 11.19 0.1886
2024-08-14 2024-06-30 13F T-MOBILE US COM 872590104 23,666,486 -575,157 -2.37 4,169,562 5.38 0.1822
2024-05-15 2024-03-31 13F T-MOBILE US COM 872590104 24,241,643 702,799 2.99 3,956,721 4.84 0.1769
2024-02-14 2023-12-31 13F T-MOBILE US COM 872590104 23,538,844 808,427 3.56 3,773,983 18.55 0.1836
2023-11-14 2023-09-30 13F T-MOBILE US COM 872590104 22,730,417 -2,002,856 -8.10 3,183,395 -7.34 0.1765
2023-08-14 2023-06-30 13F T-MOBILE US COM 872590104 24,733,273 874,192 3.66 3,435,452 -0.59 0.1804
2023-05-15 2023-03-31 13F T-MOBILE US COM 872590104 23,859,081 -79,474 -0.33 3,455,748 3.11 0.1950
2023-05-15 2022-12-31 13F/A-99 T-MOBILE US COM 872590104 23,938,555 -149,070 -0.62 3,351,398 3.70 0.1969
2023-05-15 2022-12-31 13F T-MOBILE US COM 872590104 23,938,555 -149,070 3,351,398 0.1969
2022-11-15 2022-09-30 13F T-MOBILE US COM 872590104 24,087,625 405,082 1.71 3,231,837 1.43 0.2044
2022-08-15 2022-06-30 13F T-MOBILE US COM 872590104 23,682,543 -1,071,900 -4.33 3,186,249 0.28 0.1909
2022-05-16 2022-03-31 13F T-MOBILE US COM 872590104 24,754,443 -1,859,736 -6.99 3,177,233 2.93 0.1571
2022-02-14 2021-12-31 13F T-MOBILE US COM 872590104 26,614,179 195,324 0.74 3,086,712 -8.55 0.1464
2021-11-15 2021-09-30 13F T-MOBILE US COM 872590104 26,418,855 1,554,078 6.25 3,375,273 -6.27 0.1784
2021-08-16 2021-06-30 13F T-MOBILE US COM 872590104 24,864,777 519,914 2.14 3,601,166 18.06 0.1898
2021-07-09 2021-03-31 13F/A-1 T-MOBILE US COM 872590104 24,344,863 21,151 0.09 3,050,168 -7.01 0.1749
2021-05-17 2021-03-31 13F T-MOBILE US COM 872590104 24,344,863 21,151 3,050,168 0.1749
2021-02-16 2020-12-31 13F T-MOBILE US COM 872590104 24,323,712 -406,568 -1.64 3,280,053 15.98 0.2008
2020-11-10 2020-09-30 13F T-MOBILE US COM 872590104 24,730,280 1,264,809 5.39 2,828,155 15.72 0.1931
2020-08-14 2020-06-30 13F T-MOBILE US COM 872590104 23,465,471 7,924,980 51.00 2,443,929 87.44 0.1777
2020-06-19 2020-03-31 13F/A-1 T MOBILE US COM 872590104 15,540,491 781,909 5.30 1,303,847 12.66 0.1140
2020-05-11 2020-03-31 13F T MOBILE US COM 872590104 15,540,491 781,909 1,303,847 114,504.0199
2020-02-06 2019-12-31 13F T MOBILE US COM 872590104 14,758,582 287,303 1.99 1,157,368 1.53 0.0793
2019-11-14 2019-09-30 13F T MOBILE US COM 872590104 14,471,279 6,846,964 89.80 1,139,903 101.66 0.0850
2019-08-14 2019-06-30 13F T MOBILE US COM 872590104 7,624,315 312,842 4.28 565,267 11.88 0.0421
2019-05-15 2019-03-31 13F T MOBILE US COM 872590104 7,311,473 734,780 11.17 505,223 20.77 0.0394
2019-02-12 2018-12-31 13F T MOBILE US COM 872590104 6,576,693 229,199 3.61 418,343 -6.09 0.0381
2018-11-09 2018-09-30 13F T-MOBILE US Common equity shares 872590104 6,347,494 274,640 4.52 445,456 22.76 0.0342
2018-08-14 2018-06-30 13F T-MOBILE US Common equity shares 872590104 6,072,854 374,691 6.58 362,857 4.32 0.0303
2018-05-15 2018-03-31 13F T-MOBILE US Common equity shares 872590104 5,698,163 -176,572 -3.01 347,822 -6.78 0.0295
2018-02-14 2017-12-31 13F T-MOBILE US Common equity shares 872590104 5,874,735 139,725 2.44 373,108 5.51 0.0300
2017-11-14 2017-09-30 13F T-MOBILE US Common equity shares 872590104 5,735,010 135,925 2.43 353,619 4.19 0.0305
2017-08-14 2017-06-30 13F T-MOBILE US Common equity shares 872590104 5,599,085 289,120 5.44 339,409 -1.04 0.0300
2017-05-15 2017-03-31 13F T-MOBILE US Common equity shares 872590104 5,309,965 119,285 2.30 342,971 14.89 0.0306
2017-02-09 2016-12-31 13F T-MOBILE US Common equity shares 872590104 5,190,680 -39,961 -0.76 298,520 22.15 0.0281
2017-01-13 2016-09-30 13F/A-1 T-MOBILE US Common equity shares 872590104 5,230,641 209,723 4.18 244,381 12.49 0.0246
2016-11-14 2016-09-30 13F T-MOBILE US Common equity shares 872590104 5,127,610 239,567
2016-08-12 2016-06-30 13F T-MOBILE US Common equity shares 872590104 5,020,918 99,560 2.02 217,255 15.26 0.0233
2016-05-20 2016-03-31 13F/A-1 T-MOBILE US Common equity shares 872590104 4,921,358 97,507 2.02 188,487 -0.12 0.0204
2016-05-12 2016-03-31 13F T-MOBILE US Common equity shares 872590104 4,921,358 188,487
2016-02-16 2015-12-31 13F T-MOBILE US Common equity shares 872590104 4,823,851 339,120 7.56 188,706 5.69 0.0206
2015-11-16 2015-09-30 13F T-MOBILE US Common equity shares 872590104 4,484,731 96,121 2.19 178,542 4.93 0.0208
2015-08-13 2015-06-30 13F T-MOBILE US Common equity shares 872590104 4,388,610 60,482 1.40 170,146 24.05 0.0182
2015-05-15 2015-03-31 13F T-MOBILE US Common equity shares 872590104 4,328,128 20,343 0.47 137,155 18.19 0.0141
2015-02-11 2014-12-31 13F T-MOBILE US Common equity shares 872590104 4,307,785 -669,770 -13.46 116,047 -19.25 0.0116
2014-11-12 2014-09-30 13F/A-1 T-MOBILE US Common equity shares 872590104 4,977,555 738,535 17.42 143,711 0.84 0.0155
2014-11-10 2014-09-30 13F T-MOBILE US Common equity shares 872590104 4,977,555 143,711
2014-08-12 2014-06-30 13F T-MOBILE US Common equity shares 872590104 4,239,020 507,457 13.60 142,519 15.63 0.0154
2014-05-15 2014-03-31 13F/A-1 T-MOBILE US Common equity shares 872590104 3,731,563 -284,545 -7.09 123,256 -8.77 0.0140
2014-05-13 2014-03-31 13F T-MOBILE US Common equity shares 872590104 3,733,013 123,304
2014-02-06 2013-12-31 13F/A-1 T-MOBILE US Common equity shares 872590104 4,016,108 709,640 21.46 135,107 57.34 0.0150
2014-02-06 2013-12-31 13F T-MOBILE US Common equity shares 872590104 13,404,317 133,248
2013-11-12 2013-09-30 13F T-MOBILE US Common equity shares 872590104 3,306,468 -3,465 -0.10 85,871 4.57 0.0106
2013-08-08 2013-06-30 13F T-MOBILE US Common equity shares 872590104 3,309,933 3,309,933 82,120 0.0107
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.