T-Mobile Stock (TMUS) After Hours: What Moved Shares on Dec. 19, 2025—and What to Watch Before the Next Market Open
T-Mobile US shares fell 1.77% to $196.73 on Friday, December 19, 2025, underperforming the broader market and snapping a four-day winning streak. Volume surged to about 17.16 million shares, over three times the 50-day average, amid options expiration and a Citigroup price-target cut. In after-hours trading, TMUS edged up to around $197.33. The S&P 500 rose 0.88% the same day.