Stock Market Today, Oct. 9: AT&T Slides on SpaceX Spectrum Deal Threat

AT&T shares slid on Monday, Oct. 9, following SpaceX's acquisition of 800 MHz low-band spectrum, which could intensify competition in the wireless market. The deal sent shares of AT&T, Verizon, and T-Mobile lower. SpaceX's move comes after it recently won FCC approval for a 15,000-satellite network.