SpaceX buys nationwide low band spectrum to become mobile carrier, carrier stocks plunge

SpaceX announced Thursday it has agreed to acquire a nationwide portfolio of low band spectrum from Grain Management, pending approval from the Federal Communications Commission, to power its Starlink Mobile satellite to phone service. The company said the deal would make it "a major mobile carrier" in the United States, putting Elon Musk's satellite business into direct competition with the country's established wireless companies.

Musk posted on his social platform that the 800 MHz airwaves, up to 14 MHz of paired spectrum, are "the last critical piece of the spectrum puzzle" for complete phone coverage. Low band spectrum travels long distances and penetrates walls and buildings far better than higher frequencies, which is why carriers have long treated it as the foundation of reliable nationwide service.

Investors reacted fast. Shares of incumbent carriers sank in extended trading on Thursday: AT&T fell more than 6 to 8 percent, Verizon dropped about 5 to 7 percent, and T-Mobile lost roughly 6 to 8 percent. Tower operators moved the other way, with American Tower, Crown Castle and SBA all gaining as the prospect of new network buildout spending raised the value of their sites.

The deal continues SpaceX's steady push into telecommunications after its earlier acquisition of spectrum from EchoStar. Separately, SpaceX was reported to be discussing raising $40 billion to buy Nvidia artificial intelligence chips, a sign of how large the company's ambitions have grown across both connectivity and computing.

The announcement landed on a day of heavy deal making in the technology sector, and it sets up a long regulatory and competitive fight. The FCC must still approve the spectrum transfer, and the incumbent carriers have both the legal resources and the political standing to challenge any condition they see as favoring the newcomer.

The stakes go beyond one deal. Low band spectrum is scarce because it was licensed out decades ago, and carriers have paid tens of billions of dollars at auction for the frequencies they hold. For SpaceX to secure a nationwide low band portfolio without an auction changes the math of who can compete in mobile service, which is exactly why the market repriced the incumbents so quickly on Thursday.