Array Digital Infrastructure — Business Overview
What does Array Digital Infrastructure do?
Array Digital Infrastructure is a cell tower company that leases space on its towers to wireless carriers. Formerly known as United States Cellular Corporation, Array rebranded on August 1, 2025 after selling its wireless operations to T-Mobile for approximately $4.3 billion. Today, the company owns 4,450 cell towers across 19 states and generates revenue by renting vertical space on those towers to tenants like T-Mobile, AT&T, and Verizon, who install their own network equipment. Array is currently the fifth largest tower owner and operator in the United States.
Array also holds noncontrolling interests in wireless operating companies and is working through the sale of remaining spectrum licenses. Spectrum licenses (rights to use specific radio frequencies) are being sold in separate deals to Verizon ($1.0 billion), AT&T ($1.0 billion), and T-Mobile ($171 million combined), though several of these transactions are still pending regulatory approval. These are one-time asset sales, not ongoing revenue, and are part of the company's transition away from its wireless heritage.
How does Array Digital Infrastructure make money?
Array's primary revenue comes from leasing space on its towers to wireless carriers under long-term agreements. Tenants pay to install antennas and related equipment on Array's tower structures. Revenue per lease varies based on how much equipment a tenant installs, where on the tower it sits, and the tower's location. Array has signed Master License Agreements (MLAs) — long-term contracts with defined lease terms and built-in rent escalators — with its largest customers, providing predictable, recurring revenue. The T-Mobile MLA alone includes a commitment for 2,015 individual site lease agreements.
The business benefits from very low tenant turnover and high renewal rates. Because moving network equipment from one tower to another is extremely costly and suitable alternative locations are often unavailable, tenants almost never leave. This "stickiness" makes tower leasing a highly stable, recurring-revenue business. The main operating costs are ground rent (the largest expense), tower maintenance, utilities, property taxes, and insurance.
What market does Array Digital Infrastructure operate in?
Array operates in the shared wireless communications infrastructure market, which is driven by rising mobile data consumption and ongoing 5G network buildout. Cell towers are essential physical infrastructure — wireless carriers rely on them to deliver service without having to own or manage the towers themselves. Demand for tower space has been consistently strong and is expected to continue growing as carriers expand 5G coverage, bridge rural connectivity gaps (the "digital divide"), and adopt next-generation technologies.
The tower industry is a mature but still-growing market with strong secular tailwinds. The core tower leasing model is well-established, but growth continues as carriers need more sites and denser coverage to handle data traffic. Array highlights that continued spectrum deployments and rural connectivity initiatives will sustain demand for tower infrastructure for years to come.
Who are Array Digital Infrastructure's main competitors?
The tower industry is dominated by a small number of large national players, making it a highly consolidated market. Array's primary competitors include:
| Competitor | Notes |
|---|---|
| American Tower Corporation | Largest tower operator in the U.S. and globally |
| Crown Castle Inc. | Major U.S. tower and small cell operator |
| SBA Communications Corporation | Large U.S. and international tower operator |
| Regional tower operators | Smaller, local or regional portfolios |
| Build-to-suit providers | Companies that construct towers to order |
| Non-tower infrastructure owners | Building rooftops and other structures used for antennas |
| Carrier self-ownership | Wireless carriers who build and own their own towers |
Array's key competitive claim is a lower-than-average tenancy rate, which it frames as an opportunity rather than a weakness. Because its towers were previously part of an integrated wireless business rather than a standalone leasing operation, many of them carry fewer tenants than those of competitors. Array argues this means there is more available space to lease up, particularly in rural, suburban, and urban markets. Additionally, over one-third of Array's towers have no competing tower structure within a two-mile radius, which gives those locations a degree of local exclusivity.
Where does Array Digital Infrastructure operate?
Array operates exclusively in the United States, with towers spread across 19 states. The filing does not break out specific revenue by state or region, but the portfolio of 4,450 towers covers a mix of rural, suburban, and urban areas. The company's roots in the legacy US Cellular wireless business mean its geographic footprint is concentrated in markets where that carrier historically operated, rather than blanketing the entire country evenly.
Array's towers are primarily located on leased land, with some owned ground. About 18% of the portfolio sits on deeded land or land covered by a perpetual easement (permanent land rights), while the remaining 82% involves ground leases. Over 65% of those ground leases have expiration dates more than ten years out, reducing near-term land cost risk. Array has a stated strategy of buying out ground leases over time to reduce this long-term exposure.