T-Mobile Slips 0.20% as Trading Volume Plunges 33.68% to $610M Ranking 147th in Market Activity

T-Mobile US (TMUS) traded lower by 0.20% on September 26, 2025, as trading volume dropped 33.68% to $0.61 billion, ranking 147th in market activity. The decline in liquidity highlights reduced investor engagement, though the stock remains within its typical volatility range. Analysts note the move reflects broader market caution ahead of key economic data releases later in the month.

Strategic backtesting for TMUS requires precise parameters to ensure reliability. Key considerations include defining the market universe (e.g., U.S.-listed stocks), volume calculation method (dollar volume vs. share count), execution timing (close-to-close vs. open-to-close), and transaction cost assumptions. Default settings assume U.S. equities, dollar volume rankings, one-day holding periods, and zero trading costs. Custom adjustments are available upon request.

For a representative backtest, clarification is needed on whether to include global securities or limit the universe to NYSE/NASDAQ/AMEX. Volume metrics must specify liquidity ranking conventions, and execution timing should align with the investor’s strategy (e.g., avoiding overnight gaps). Cost structures, including slippage or fixed basis points, also require definition to refine results.

If default parameters suffice—U.S. stocks, dollar volume, close-to-close execution, and zero costs—the backtest can proceed. Otherwise, adjustments should be specified prior to implementation to ensure alignment with the intended strategy framework.