T-Mobile is trading 4.18% lower at $152.15 after-hours, with broader market weakness potentially contributing. - The price is below T-Mobile’s October 22 regular-session close of $158.79. - The provided market context reports the S&P 500 down 1.15% and Nasdaq down 1.26%. - T-Mobile’s first AI-RAN call with NVIDIA and Nokia was reported October 22, but it is not a clear explanation for the decline; no specific company catalyst was confirmed.