American Tower Stock After the SpaceX Cell Site Report: Paying for a Lease Nobody Has Signed

After the close on October 22, Bloomberg reported that SpaceX is in talks to get access to at least 80,000 US cell sites, with Crown Castle named as one of the tower owners at the table, to build a fourth national wireless network. On October 23 American Tower opened at $202, up 11%, and closed at $188.97, up 4.1%. Crown Castle closed up 9%, AT&T and T-Mobile fell about 8%, and Verizon fell 1%.

It's the second SpaceX rally this month. On October 9 American Tower closed up 9% after SpaceX agreed to buy Grain Management's 800 MHz spectrum for about $8 billion. From the October 8 close of $166.73, the stock is up about 13% in two weeks, and none of that is a signed lease. SBA Communications, which the report didn't name, is up about 9% over the same stretch, so a good part of the move is a trade in all tower stocks. Crown Castle's CEO said on its October 21 call only that "you can assume that we're talking to all parties."

American Tower has had a fourth national carrier as a tenant before. DISH signed a long-term agreement for its 5G build, running into 2036. In 2025 its parent EchoStar sold about $23 billion of spectrum to AT&T and about $17 billion to SpaceX, then told American Tower in September 2025 that the sales excused it from paying. American Tower's 2025 10-K says DISH was about 4% of U.S. & Canada property revenue and "as of January 2026 is in default." The CEO put it at about $200 million a year through 2035, and as of the 10-K the lawsuit in Colorado was still pending.

Growth went from 3.9% and 5.6% in the two quarters before DISH stopped paying to 0.6% and 0.7% in the two after. American Tower doesn't split out how much of that drop is DISH, but the timing is hard to miss. SpaceX bought part of the spectrum whose sale ended that lease.

The moat file on AMT is about site scarcity. Zoning and permitting make new towers slow to build, and moving a carrier's equipment is expensive. That protects American Tower against a rival tower going up down the road. It does much less when a tenant's business plan changes. DISH left because it sold the spectrum its network ran on, and the rent stopped with it.

In August, Gwynne Shotwell described SpaceX's ground network as small radios next to Starlink dishes on host rooftops, "these little femtocells," built that way to avoid spending "10 or many billions of dollars" up front. That plan didn't need towers. The 800 MHz deal changed things, because low-band spectrum carries far and gets indoors, and it's normally run off macro towers. So the October report fits the spectrum SpaceX now holds. It's still only a report of talks, and two months ago the plan was rooftops.

The bull case is that SpaceX is the opposite of DISH. DISH was a seller of spectrum looking for a way out of a network it couldn't fund. SpaceX is a buyer, with the EchoStar and Grain deals, and it has the cash flow from Starlink to pay rent. Bernstein's Laurent Yoon said committing to 80,000 macro sites "could be a point of no return." Once SpaceX has radios on that many towers, it's in the same position AT&T and Verizon are in, with equipment wired into a live network that's expensive to move, which is the switching cost American Tower's moat rests on.

There's also the arithmetic. With the 2026 guide around 0.5%, and AT&T, T-Mobile and Verizon at 85% of U.S. & Canada property revenue in 2025, a new national tenant would matter. Wireless Estimator, using a consultant's estimate, put DISH's average rent at about $16,800 a site a year. American Tower is one of three big US tower owners, so say it got a fifth of 80,000 sites. At that rent that's about $270 million a year, more than DISH paid. And the market could be right to pay early. A signed lease is usually announced well before the revenue shows up, so waiting for the billings line means buying after the move.

I take that seriously, and if SpaceX signs with American Tower, I'm wrong about this rally. Whether that lease outlasts the next change in SpaceX's plans is a separate and longer question, and DISH shows it's a real one. There's also a second-order risk the rally ignores. If SpaceX wins subscribers from the big three, the tenants behind 85% of American Tower's U.S. & Canada property revenue have less reason to keep adding equipment.

American Tower reports Q3 on October 27, before the open. I'll look for three things: whether management confirms talks with SpaceX or stays where Crown Castle did, what U.S. & Canada organic billings growth does against the 0.7% in the chart, and any early read on 2027. Then the real test. If American Tower names SpaceX as a signed tenant before its Q2 2027 report, the rally paid for something real and I'm wrong. Until then the 13% is paying for a report of talks.