AI-fueled tower rally faces valuation tug-of-war

The timing of the reset was unusually clear: The Globe and Mail noted that “American Tower Corporation AMT is scheduled to release third-quarter 2026 results on Oct. 27,” while framing expectations around year-over-year revenue and AFFO growth, effectively setting the stage for a market-moving print. Ahead of that release, management had already sharpened the earnings narrative by saying, “Management raised its full-year data center revenue growth outlook to approximately 15% from 13%, reflecting record leasing activity and improving demand,” while expected Q3 strength was also tied to global leasing demand and contractual rent escalations.

When the numbers arrived, they validated that setup and broadened it into a sector move: Investing.com Nigeria reported, “American Tower Beats Q3 2026 Estimates: $2.79 B Revenue, $2.87 EPS, International Growth Outpaces U.S. Outlook,” underscoring both the beat and the international-growth emphasis. The stock reaction quickly spread beyond one name, as AlphaStreet News captured in the headlines “American Tower Jumps 7.7% Amid Sector-Wide Rally” and “SBA Communications Leaps 8.1% as Tower REITs Rally with Crown Castle Up 12%,” showing that late-October earnings and guidance updates had become a broad tower REIT catalyst.

The mechanism behind the rally is straightforward: AI workloads are not just boosting abstract compute demand, they are pulling through real interconnection and leasing needs for the infrastructure owners that sit between clouds, networks, and enterprise traffic. Beta Finch’s summary of American Tower management described the company as an “Interconnection Hub” serving AI workloads, and the updated 2026 outlook is framed as clearer visibility into how American Tower’s tower and data center operations are translating rising data usage and AI workloads into tenant billings and rent. Broader industry analysis shows why investors believe that demand can persist: “According to ID8 research, the global data center market is projected to grow from approximately $435 billion in 2025 to nearly $680 billion by 2030, driven largely by AI infrastructure investment and hyperscale expansion.”

That demand is becoming more valuable because supply is constrained and increasingly global, which helps explain why investors reward operators with exposure beyond slower North American leasing pockets and with diversification into faster-growing Africa-Asia markets. Utility procurement analysis notes that “permitting and interconnection processes are becoming more congested… In some major data center markets, new facilities are reportedly facing grid connection wait times of three to five years,” even as “Data centers currently account for roughly 4% of U.S. electricity consumption and could reach as much as 17% within the next few years,” making scarce capacity in markets such as Singapore and Zurich strategically important and supportive of rent resilience.

The core tower REIT business is not selling wireless service but renting vertical real estate under long contracts, which makes the economics highly sensitive to how many tenants can be layered onto the same structure. As The Motley Fool put it, “Due to the high fixed costs of building a tower, the return on investment for a single-tenant lease is low, but increases exponentially with each additional tenant,” citing an American Tower model showing “a 3% return on investment for a single tenant, 13% for two tenants, and 24% for three tenants.”

That is why even one more lessee can matter so much: the revenue from added equipment largely rides on infrastructure that is already built, lifting returns through colocation rather than new construction. The Motley Fool highlighted SpaceX as a live example, saying it is “reportedly taking another step… by seeking to secure space on telecom towers,” is “looking for access to 80,000 cell tower sites in the U.S.” and is “in talks with Crown Castle about space on its tower network,” underscoring how incremental occupancy can materially raise tower value.

The late-October bounce has not ended the valuation argument so much as sharpened it. Simply Wall St said the “valuation gap to fair value models and analyst targets has narrowed but not closed,” pointing to a fair value of $227.26 versus a latest close of $188.97 and adding that AMT “trades at $182.24 against my fair value of $227.26,” a discount that can be read two ways: upside for bulls, or evidence that the market still demands a risk premium before fully endorsing the improved outlook.

That ambivalence also shows up in how the rally is behaving and how the business is being judged. Simply Wall St said momentum is “uneven but is currently building,” even after AMT posted a “1 day share price return of 4.08%” and “30 day share price return of 11.80%,” and it explicitly described “Mixed signals on American Tower so far,” despite “record leasing activity and healthier demand across that business” and a raised “full year data center revenue growth outlook,” underscoring why investors still debate whether the stock deserves a cleaner re-rating.