Boston Partners
TMUS icon

Boston Partners’s T-Mobile US TMUS Stock Holding History

Boston Partners’s Portfolio TMUS Stock Details TMUS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$504M Buy
2,402,550
+72,594
+3% +$14.9M 0.53% 61
2025
Q4 		$472M Buy
2,329,956
+211,332
+10% +$44.8M 0.49% 69
2025
Q3 		$506M Buy
2,118,624
+579,352
+38% +$140M 0.52% 60
2025
Q2 		$367M Buy
1,539,272
+151,317
+11% +$36.9M 0.41% 79
2025
Q1 		$370M Sell
1,387,955
-161,218
-10% -$39.7M 0.45% 72
2024
Q4 		$342M Sell
1,549,173
-298,247
-16% -$67.8M 0.42% 81
2024
Q3 		$383M Sell
1,847,420
-17,061
-0.9% -$3.27M 0.45% 81
2024
Q2 		$329M Sell
1,864,481
-732,859
-28% -$123M 0.41% 86
2024
Q1 		$424M Buy
2,597,340
+28,045
+1% +$4.56M 0.51% 66
2023
Q4 		$412M Sell
2,569,295
-169,799
-6% -$25.1M 0.55% 56
2023
Q3 		$384M Buy
2,739,094
+647,234
+31% +$89.7M 0.53% 64
2023
Q2 		$290M Sell
2,091,860
-479,207
-19% -$67.3M 0.39% 90
2023
Q1 		$372M Sell
2,571,067
-836,194
-25% -$121M 0.51% 67
2022
Q4 		$479M Sell
3,407,261
-79,466
-2% -$11.4M 0.65% 47
2022
Q3 		$470M Sell
3,486,727
-308,047
-8% -$43.3M 0.69% 42
2022
Q2 		$512M Buy
3,794,774
+721,764
+23% +$94.2M 0.72% 43
2022
Q1 		$395M Buy
3,073,010
+1,209,516
+65% +$144M 0.48% 69
2021
Q4 		$216M Buy
1,863,494
+157,350
+9% +$18.5M 0.26% 134
2021
Q3 		$218M Sell
1,706,144
-936,673
-35% -$130M 0.28% 125
2021
Q2 		$383M Sell
2,642,817
-1,848,965
-41% -$255M 0.49% 63
2021
Q1 		$563M Buy
4,491,782
+919,898
+26% +$116M 0.76% 34
2020
Q4 		$482M Sell
3,571,884
-151,399
-4% -$18.7M 0.75% 37
2020
Q3 		$426M Buy
3,723,283
+756,538
+26% +$83.9M 0.78% 37
2020
Q2 		$309M Buy
+2,966,745
New +$284M 0.57% 57

Other funds holding TMUS

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
SoftBank Group
SoftBank Group Tokyo, Japan $11.4B AUM 27.91% 1-Year Est. Return

Boston Partners's TMUS Position: Q1 2026 in Review

Boston Partners increased its T-Mobile US (TMUS) stake by 3.1% in Q1 2026, buying an estimated $14.9M and bringing the position to 2,402,550 shares worth $504M. The position accounts for 0.53% of the portfolio, ranked #61.

Boston Partners first reported a position in TMUS in Q2 2020 and has held it in 24 quarters since. The position peaked at $563M in Q1 2021. 1,719 funds tracked by Wall St. Rank hold TMUS as of Q1 2026.

  • Boston Partners held 2,402,550 shares of T-Mobile US worth $504M as of Q1 2026.
  • Boston Partners bought 72,594 T-Mobile US shares in Q1 2026, an estimated $14.9M.
  • T-Mobile US made up 0.53% of Boston Partners's portfolio in Q1 2026, its #61 holding.
  • Boston Partners first reported a position in T-Mobile US in Q2 2020 and has held it in 24 quarters since.
  • Boston Partners's T-Mobile US position peaked at $563M in Q1 2021.
  • 1,719 funds tracked by Wall St. Rank held T-Mobile US as of Q1 2026.

Based on Boston Partners's 13F filing for Q1 2026, filed 11 May 2026.