William Blair & Company
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William Blair & Company’s T-Mobile US TMUS Stock Holding History

William Blair & Company’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 		$4.54M Buy
21,604
+4,321
+25% +$888K 0.01% 523
2025
Q4 		$3.51M Buy
17,283
+2,535
+17% +$537K 0.01% 606
2025
Q3 		$3.53M Buy
14,748
+3,509
+31% +$849K 0.01% 605
2025
Q2 		$2.68M Buy
11,239
+970
+9% +$237K 0.01% 646
2025
Q1 		$2.74M Sell
10,269
-263
-2% -$64.8K 0.01% 641
2024
Q4 		$2.32M Sell
10,532
-135
-1% -$30.7K 0.01% 677
2024
Q3 		$2.2M Sell
10,667
-4,167
-28% -$798K 0.01% 682
2024
Q2 		$2.61M Sell
14,834
-1,608
-10% -$270K 0.01% 634
2024
Q1 		$2.68M Sell
16,442
-1,132
-6% -$184K 0.01% 613
2023
Q4 		$2.82M Buy
17,574
+1,503
+9% +$222K 0.01% 589
2023
Q3 		$2.25M Buy
16,071
+3,845
+31% +$533K 0.01% 622
2023
Q2 		$1.7M Buy
12,226
+2,117
+21% +$297K 0.01% 702
2023
Q1 		$1.46M Buy
10,109
+2,334
+30% +$338K 0.01% 729
2022
Q4 		$1.09M Buy
7,775
+842
+12% +$121K ﹤0.01% 798
2022
Q3 		$930K Sell
6,933
-801
-10% -$112K ﹤0.01% 838
2022
Q2 		$1.04M Buy
7,734
+219
+3% +$28.6K ﹤0.01% 836
2022
Q1 		$965K Sell
7,515
-5,219
-41% -$622K ﹤0.01% 935
2021
Q4 		$1.48M Sell
12,734
-14,680
-54% -$1.73M ﹤0.01% 816
2021
Q3 		$3.5M Sell
27,414
-1,041
-4% -$145K 0.01% 542
2021
Q2 		$4.12M Buy
28,455
+410
+1% +$56.5K 0.01% 504
2021
Q1 		$3.51M Sell
28,045
-4,652
-14% -$586K 0.01% 538
2020
Q4 		$4.41M Buy
32,697
+7,093
+28% +$876K 0.02% 463
2020
Q3 		$2.93M Buy
25,604
+7,077
+38% +$784K 0.01% 503
2020
Q2 		$1.93M Buy
18,527
+15,069
+436% +$1.44M 0.01% 564
2020
Q1 		$290K Sell
3,458
-282
-8% -$23.9K ﹤0.01% 1024
2019
Q4 		$293K Buy
+3,740
New +$294K ﹤0.01% 1177
2017
Q4 		– Sell
-4,174
Closed -$257K – 1442
2017
Q3 		$257K Sell
4,174
-8,085
-66% -$507K ﹤0.01% 1172
2017
Q2 		$743K Buy
12,259
+2,825
+30% +$184K 0.01% 843
2017
Q1 		$590K Sell
9,434
-8,500
-47% -$523K ﹤0.01% 857
2016
Q4 		$1.03M Buy
17,934
+184
+1% +$9.63K 0.01% 646
2016
Q3 		$829K Sell
17,750
-3,100
-15% -$142K 0.01% 700
2016
Q2 		$902K Sell
20,850
-841
-4% -$34.5K 0.01% 660
2016
Q1 		$830K Sell
21,691
-12,784
-37% -$483K 0.01% 663
2015
Q4 		$1.35M Sell
34,475
-118,260
-77% -$4.57M 0.01% 555
2015
Q3 		$6.08M Sell
152,735
-39
-0% -$1.56K 0.05% 288
2015
Q2 		$5.92M Buy
152,774
+24,205
+19% +$867K 0.01% 1028
2015
Q1 		$4.07M Buy
+128,569
New +$4.01M 0.01% 1095

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

William Blair & Company's TMUS Position: Q1 2026 in Review

William Blair & Company increased its T-Mobile US (TMUS) stake by 25% in Q1 2026, buying an estimated $888K and bringing the position to 21,604 shares worth $4.54M. The position accounts for 0.01% of the portfolio, ranked #523.

William Blair & Company first reported a position in TMUS in Q1 2015 and has held it in 37 quarters since. The position peaked at $6.08M in Q3 2015. 1,720 funds tracked by Wall St. Rank hold TMUS as of Q1 2026.

  • William Blair & Company held 21,604 shares of T-Mobile US worth $4.54M as of Q1 2026.
  • William Blair & Company bought 4,321 T-Mobile US shares in Q1 2026, an estimated $888K.
  • T-Mobile US made up 0.01% of William Blair & Company's portfolio in Q1 2026, its #523 holding.
  • William Blair & Company first reported a position in T-Mobile US in Q1 2015 and has held it in 37 quarters since.
  • William Blair & Company's T-Mobile US position peaked at $6.08M in Q3 2015.
  • 1,720 funds tracked by Wall St. Rank held T-Mobile US as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.