T-Mobile US, Inc.
MX ˙ BMV ˙ US8725901040
SecurityMX:TMUS / T-Mobile US, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership4,594,338 shares
Latest Disclosed Value $ 964,948,811
Northern Trust Corp reports 4.23% decrease in ownership of TMUS / T-Mobile US, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 4,594,338 shares of T-Mobile US, Inc. (MX:TMUS) valued at $964,948,811 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 4,797,384 shares of T-Mobile US, Inc.. This represents a change in shares of -4.23% 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.

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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)
2026-05-14 2026-03-31 13F T-MOBILE US COM 872590104 4,594,338 -203,046 -4.23 964,949 -0.94 0.0262
2026-02-17 2025-12-31 13F T-MOBILE US COM 872590104 4,797,384 -127,825 -2.60 974,061 -17.38 0.0256
2025-11-14 2025-09-30 13F T-MOBILE US COM 872590104 4,925,209 28,823 0.59 1,178,997 1.06 0.1508
2025-08-13 2025-06-30 13F T-MOBILE US COM 872590104 4,896,386 -231,500 -4.51 1,166,613 -14.70 0.1604
2025-05-13 2025-03-31 13F T-MOBILE US COM 872590104 5,127,886 -197,655 -3.71 1,367,658 16.35 0.2030
2025-02-14 2024-12-31 13F T-MOBILE US COM 872590104 5,325,541 645,892 13.80 1,175,507 21.73 0.1664
2024-11-13 2024-09-30 13F T-MOBILE US COM 872590104 4,679,649 -210,289 -4.30 965,692 12.09 0.1581
2024-08-14 2024-06-30 13F T-MOBILE US COM 872590104 4,889,938 66,624 1.38 861,509 9.43 0.1452
2024-05-14 2024-03-31 13F T-MOBILE US COM 872590104 4,823,314 -197,410 -3.93 787,261 -2.20 0.1360
2024-02-13 2023-12-31 13F T-MOBILE US COM 872590104 5,020,724 -224,828 -4.29 804,973 9.57 0.1457
2023-11-13 2023-09-30 13F T-MOBILE US COM 872590104 5,245,552 -277,616 -5.03 734,640 -4.24 0.1423
2023-08-11 2023-06-30 13F T-MOBILE US COM 872590104 5,523,168 -148,138 -2.61 767,168 -6.61 0.1474
2023-05-15 2023-03-31 13F T-MOBILE US COM 872590104 5,671,306 -89,062 -1.55 821,432 1.86 0.1629
2023-02-13 2022-12-31 13F T-MOBILE US COM 872590104 5,760,368 -11,268 -0.20 806,452 4.14 0.1692
2022-11-14 2022-09-30 13F T-MOBILE US COM 872590104 5,771,636 44,239 0.77 774,381 0.50 0.1769
2022-08-12 2022-06-30 13F T-MOBILE US COM 872590104 5,727,397 25,853 0.45 770,563 5.30 0.1650
2022-05-13 2022-03-31 13F T-MOBILE US COM 872590104 5,701,544 -40,282 -0.70 731,793 9.89 0.1287
2022-02-08 2021-12-31 13F T-MOBILE US COM 872590104 5,741,826 -193,864 -3.27 665,936 -12.19 0.1091
2021-11-15 2021-09-30 13F T-MOBILE US COM 872590104 5,935,690 -139,530 -2.30 758,344 -13.81 0.1342
2021-08-13 2021-06-30 13F T-MOBILE US COM 872590104 6,075,220 33,749 0.56 879,875 16.24 0.1550
2021-05-12 2021-03-31 13F T-MOBILE US COM 872590104 6,041,471 -34,769 -0.57 756,935 -7.62 0.1408
2021-02-11 2020-12-31 13F T-MOBILE US COM 872590104 6,076,240 -99,593 -1.61 819,381 16.02 0.1596
2020-11-16 2020-09-30 13F T-MOBILE US COM 872590104 6,175,833 331,927 5.68 706,268 16.04 0.1549
2020-08-14 2020-06-30 13F T-MOBILE US COM 872590104 5,843,906 2,028,074 53.15 608,642 90.11 0.1442
2020-05-14 2020-03-31 13F T MOBILE US COM 872590104 3,815,832 127,407 3.45 320,148 10.68 0.0919
2020-02-14 2019-12-31 13F T MOBILE US COM 872590104 3,688,425 -28,631 -0.77 289,245 -1.21 0.0647
2019-11-13 2019-09-30 13F T MOBILE US COM 872590104 3,717,056 1,030,484 38.36 292,793 47.00 0.0701
2019-08-13 2019-06-30 13F T MOBILE US COM 872590104 2,686,572 185,684 7.42 199,184 15.26 0.0472
2019-05-13 2019-03-31 13F T MOBILE US COM 872590104 2,500,888 -12,336 -0.49 172,811 8.10 0.0427
2019-02-12 2018-12-31 13F T MOBILE US COM 872590104 2,513,224 213,626 9.29 159,866 -0.94 0.0448
2018-11-14 2018-09-30 13F T MOBILE US COM 872590104 2,299,598 -286,361 -11.07 161,386 4.45 0.0395
2018-09-18 2018-06-30 13F/A-1 T MOBILE US COM 872590104 2,585,959 62,311 2.47 154,512 0.31 0.0392
2018-08-14 2018-06-30 13F T MOBILE US COM 872590104 2,644,782 121,134 158,026
2018-05-09 2018-03-31 13F T MOBILE US COM 872590104 2,523,648 137,064 5.74 154,042 1.63 0.0401
2018-02-14 2017-12-31 13F T MOBILE US COM 872590104 2,386,584 15,049 0.63 151,573 3.65 0.0384
2017-11-13 2017-09-30 13F T MOBILE US COM 872590104 2,371,535 59,806 2.59 146,229 4.35 0.0381
2017-08-11 2017-06-30 13F T MOBILE US COM 872590104 2,311,729 28,122 1.23 140,137 -4.99 0.0392
2017-05-12 2017-03-31 13F T MOBILE US COM 872590104 2,283,607 58,776 2.64 147,498 15.28 0.0425
2017-02-13 2016-12-31 13F T MOBILE US COM 872590104 2,224,831 541,403 32.16 127,950 62.68 0.0392
2016-11-09 2016-09-30 13F T MOBILE US COM 872590104 1,683,428 51,118 3.13 78,649 11.35 0.0245
2016-08-12 2016-06-30 13F T MOBILE US COM 872590104 1,632,310 95,535 6.22 70,630 19.50 0.0229
2016-08-19 2016-03-31 13F/A-1 T MOBILE US COM 872590104 1,536,775 52,781 3.56 59,107 1.81 0.0196
2016-05-13 2016-03-31 13F T-Mobile Us COMM 872590104 1,536,730 58,856
2016-02-12 2015-12-31 13F T-Mobile Us COMM 872590104 1,483,994 -194,090 -11.57 58,055 -13.10 0.0192
2015-11-12 2015-09-30 13F T-Mobile Us COMM 872590104 1,678,084 1,678,084 0.00 66,804 0.0223
2015-08-13 2015-06-30 13F T-Mobile Us COMM 872590104 0 -1,574,925 -100.00 0 -100.00
2015-05-14 2015-03-31 13F T-Mobile Us COMM 872590104 1,574,925 40,892 2.67 49,910 20.77 0.0150
2015-02-12 2014-12-31 13F T-Mobile Us COM 872590104 1,534,033 -47,942 -3.03 41,326 -9.52 0.0125
2014-11-13 2014-09-30 13F T-Mobile Us COMM 872590104 1,581,975 -112,073 -6.62 45,672 -19.81 0.0143
2014-08-14 2014-06-30 13F T-MOBILE US com 872590104 1,694,048 206,177 13.86 56,954 15.89 0.0178
2014-05-14 2014-03-31 13F T-MOBILE US COMM 872590104 1,487,871 -6,679 -0.45 49,145 -2.25 0.0155
2014-02-21 2013-12-31 13F/A-1 T-MOBILE US COM 872590104 1,494,550 410,474 37.86 50,277 78.58 0.0161
2014-02-12 2013-12-31 13F T-MOBILE US COM 872590104 1,494,550 50,277
2013-11-13 2013-09-30 13F T-MOBILE US COM 872590104 1,084,076 -91,527 -7.79 28,153 -3.48 0.0099
2013-08-09 2013-06-30 13F T-MOBILE US COM 872590104 1,175,603 1,175,603 29,167 0.0106
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.