T-MOBILE US INC (TMUS) Stock Institutional Trading Activity


T-MOBILE US INC (TMUS) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC, Viking Global Investors, Dodge & Cox Stock Fund, Sequoia Financial Advisors, and Berkshire Hathaway. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2020Appaloosa ManagementSell-310,0004,905,000$661,439
Q4 2020Berkshire HathawayBuy2,828,8445,242,000$706,884
Q4 2020Egerton Capital UKSell-260,6147,430,187$1,001,961
Q4 2020Viking Global InvestorsBuy635,3628,705,481$1,173,934
Q3 2020Dodge & Cox Stock FundSell-796,8542,878,033$329,132
Q3 2020Renaissance Technologies LLCSell-3,958,4601,216,646$139,136
Q3 2020Berkshire HathawayBuy2,413,1562,413,156$275,968
Q3 2020Appaloosa ManagementSell-685,0005,215,000$596,387
Q3 2020Egerton Capital UKBuy3,490,4017,690,801$879,520
Q3 2020Viking Global InvestorsBuy4,270,5698,070,119$922,899
Q2 2020Dodge & Cox Stock FundBuy3,674,8873,674,887$382,739
Q2 2020Viking Global InvestorsBuy2,545,6703,799,550$395,723
Q2 2020Egerton Capital UKBuy4,200,4004,200,400$437,472
Q2 2020Renaissance Technologies LLCBuy4,837,9215,175,106$538,987
Q2 2020Appaloosa ManagementBuy5,130,0005,900,000$614,485
Q1 2020Renaissance Technologies LLCBuy7,635337,185$28,290
Q1 2020Appaloosa ManagementBuy70,000770,000$64,603
Q1 2020Viking Global InvestorsSell-2,199,0131,253,880$105,201
Q4 2019Parnassus Endeavor FundSell-55,211342,834$26,885
Q3 2019Parnassus Endeavor FundBuy25,408398,045$31,354
Q2 2019Appaloosa ManagementSell-199,548700,000$51,898
Q1 2019Renaissance Technologies LLCSell-1,040,900329,550$22,772
Q1 2019Appaloosa ManagementSell-139,162899,548$62,159
Q4 2018Parnassus Endeavor FundBuy20,637372,637$23,703
Q4 2018Appaloosa ManagementSell-1,651,4171,038,710$66,072
Q4 2018Renaissance Technologies LLCBuy1,197,8001,370,450$87,174
Q4 2018Viking Global InvestorsBuy531,5033,452,893$219,639
Q3 2018Appaloosa ManagementSell-1,309,8732,690,127$188,793
Q3 2018Viking Global InvestorsSell-296,6352,921,390$205,023
Q2 2018Parnassus Endeavor FundBuy352,000352,000$21,032

Frequently asked questions about TMUS activity

  • Which institutional owners are buying TMUS?

    Institutional owners buying TMUS include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in TMUS activity?

    "Buy" means an investor increased their reported position in TMUS compared to the prior reporting period. This reflects growing exposure to T-MOBILE US INC (TMUS) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in TMUS increasing?

    Institutional interest in TMUS can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.