Wireless service providers
Customer Exposure
Site leasing revenue comes primarily from leasing antenna space to wireless service providers under long-term contracts.
Relevance 95·Dependency 95·Confidence 97
Source evidence
“Our primary focus is the leasing of antenna space on our multi-tenant towers to a variety of wireless service providers under long-term lease contracts”
T-Mobile
Customer Exposure
T-Mobile is largest customer: 31.1% of total revenue, 36.8% of domestic site leasing, and 77.9% of site development revenue in 2025.
Relevance 95·Dependency 90·Confidence 99
Source evidence
“T-Mobile 31.1% 30.5% 32.5%”
Wireless service providers
Customer Exposure
Site leasing revenues derived primarily from wireless carrier tenants; consolidation (Sprint, EchoStar) is a churn risk.
Relevance 90·Dependency 85·Confidence 96
Source evidence
“We derive site leasing revenues primarily from wireless service provider tenants.”
5G wireless technologies
Demand Driver
Continued 5G deployment is expected to increase equipment installation at existing sites and may increase need for new sites.
Relevance 85·Dependency 80·Confidence 93
Source evidence
“the continued deployment of 5G wireless technologies is expected to increase equipment installation at existing sites and may increase the need for new sites”
~30% of towers located in Brazil; Brazil revenue/expenses substantially in local currency; 10% BRL adverse move would cut revenues ~1.1% and operating income ~0.7%.
Relevance 85·Dependency 80·Confidence 97
Source evidence
“a hypothetical 10% adverse movement in the Brazilian Real ... would have caused our revenues and operating income to decline by approximately 1.1% and 0.7%, respectively”
AT&T Wireless
Customer Exposure
AT&T Wireless contributed 20.3% of total revenues and 30.6% of domestic site leasing revenue in 2025.
Relevance 85·Dependency 70·Confidence 99
Source evidence
“AT&T Wireless 20.3% 20.6% 19.5%”
Wireless carrier network capex
Demand Driver
Tower leasing demand depends on carrier network investment; consolidation (e.g., Sprint decommissioning) causes lease churn while spectrum deployment drives leasing.
Relevance 80·Dependency 75·Confidence 94
Source evidence
“Each wireless service provider must have substantial capital resources and capabilities to deploy new spectrum in their wireless networks, including licenses for spectrum.”
US Dollar
Currency Exposure
~20.0% of FY2025 revenues and ~26.5% of operating expenses in foreign currencies; intercompany debt FX sensitivity of ~$91.8M per 10% move.
Relevance 80·Dependency 75·Confidence 96
Source evidence
“A change of 10% in the underlying exchange rates of our unsettled intercompany debt at December 31, 2025 would have resulted in approximately $91.8 million of unrealized gains or losses”
Interest Rates
Demand Driver
Refinancing and floating-rate exposure on Term Loan and Revolver; 1% rate rise raises interest expense ~0.8%; high rates may make debt repayment accretive use of capital.
Relevance 80·Dependency 70·Confidence 93
Source evidence
“interest rate risk relating to our ability to refinance our debt at commercially reasonable rates, if at all”
Foreign currencies (international operations)
Currency Exposure
Results are presented with constant currency adjustments reflecting material FX impact on international operations; FY2025 constant-currency Adjusted EBITDA change exceeded reported by $8.1M.
Relevance 75·Dependency 65·Confidence 80
Source evidence
“On a constant currency basis, Adjusted EBITDA increased $25.9 million.”
Interest rates
Cost Driver
Rising SOFR-based rates increase SBA's debt service on $2.7B variable-rate debt and also dampen carrier capex, hurting revenue growth.
Relevance 75·Dependency 60·Confidence 95
Source evidence
“If interest rates increase, our debt service obligations on the variable rate indebtedness will increase even though the amount borrowed remained the same”
Millicom International Cellular S.A.
Customer Exposure
Millicom is a key counterparty: 7,000+ Central America sites acquired from it plus a seven-year build-to-suit exclusivity with 15-year initial lease terms.
Relevance 75·Dependency 55·Confidence 95
Source evidence
“we have agreed to a seven-year exclusivity right for us to build up to 2,500 build-to-suit sites in Central America with each site built having an initial lease term of 15 years”
Verizon Wireless
Customer Exposure
Verizon Wireless contributed 15.1% of total revenues, 20.4% of domestic site leasing, and 18.2% of site development revenue in 2025.
Relevance 75·Dependency 55·Confidence 99
Source evidence
“Verizon Wireless 15.1% 15.1% 14.6%”
Political and regulatory environments in international markets
Geopolitical Exposure
Investment criteria in international markets focus on wireless provider quality/quantity and countries' political and regulatory environments.
Relevance 70·Dependency 60·Confidence 85
Source evidence
“Our investment criteria focuses on the quality and quantity of wireless service providers in a given country as well as the country's political and regulatory environments.”
Artificial intelligence
Demand Driver
AI and bandwidth-intensive applications (including generative AI) drive wireless data traffic growth requiring network capacity expansion.
Relevance 70·Dependency 55·Confidence 85
Source evidence
“increased use of artificial intelligence and emerging high-performance applications may drive increased need for reliable, secure, and interconnected wireless solutions”
Interest rates
Demand Driver
High interest rate environment influences capital allocation, with debt repayment (especially variable rate) viewed as potentially accretive use of excess capital.
Relevance 65·Dependency 60·Confidence 85
Source evidence
“in a high interest rate environment and when we believe interest rates may stay higher for longer, we believe that debt repayments, especially of our variable rate debt, may be an accretive use of our excess capital”
FAA and FCC regulations
Regulatory Exposure
FAA/FCC rules govern tower construction, lighting, marking and registration; non-compliance risks civil penalties and delays to new builds and co-locations.
Relevance 65·Dependency 55·Confidence 94
Source evidence
“FAA and FCC regulations govern construction, lighting, painting, and marking of towers and may, depending on the characteristics of the tower, require registration of the tower.”
Artificial Intelligence
Demand Driver
Management cites AI and emerging high-performance applications as a driver of customer capital investment and demand for tower space.
Relevance 65·Dependency 45·Confidence 85
Source evidence
“the demand for our services and the future capital investments of our customers (including with respect to the implementation of broad based 5G availability and as a result of artificial intelligence and emerging high-performance applications)”
Customer spending cyclicality
Revenue Exposure
Site development business is exposed to cyclical customer spending; long-term site leases reduce this exposure.
Relevance 60·Dependency 50·Confidence 85
Source evidence
“the long-term and repetitive nature of our site leasing business will permit us to maintain a stable, recurring cash flow stream and reduce our exposure to cyclical changes in customer spending which arises in our site development business”
Telefonica
Customer Exposure
Telefonica was the largest international site leasing customer at 19.7% of international site leasing revenue in 2025.
Relevance 60·Dependency 45·Confidence 97
Source evidence
“Telefonica 19.7% 21.3% 22.5%”
Guatemala
Geopolitical Exposure
~10% of total towers located in Guatemala; international operations carry political/economic/inflation/tariff/currency risks.
Relevance 55·Dependency 45·Confidence 95
Source evidence
“approximately 30% and 10% of our total towers are located in Brazil and Guatemala, respectively”
Tigo (Millicom)
Customer Exposure
Tigo's share of international site leasing revenue jumped to 11.3% in 2025 from 5.8% due to sites purchased from Millicom.
Relevance 50·Dependency 35·Confidence 95
Source evidence
“The increase in site leasing revenue derived from Tigo was due to the sites purchased from Millicom during the year ended December 31, 2025.”