Why Is T-Mobile US $TMUS Stock Down -9.51% Today? (Find out why any stock moved today on Tickeron.) • $TMUS shares fell about 9.51% to $155.01, down from a prior close of $171.31. • The primary catalyst was SpaceX's ( $8 billion) acquisition of nationwide 800 MHz low-band spectrum, signaling its Starlink Mobile ambitions as a direct wireless rival. • Secondary pressures included rising Treasury yields weighing on dividend-paying telecom stocks and analyst price-target cuts at Barclays and Scotiabank. • The selloff was sector-wide, with T and VZ also sliding sharply. • Investors are watching for FCC regulatory developments and any sign that SpaceX's network buildout accelerates competitive pressure on pricing and subscriber growth. $T $VZ $CHTR $CMCSA $LUMN $SATS $VOD