TMUS · CIK 1283699
What T-Mobile US, Inc. told the SEC could break it.
Though substantially all of its revenue and assets are U.S.-based, T-Mobile's disclosures cluster on the cost and supply side of running a network. Tariffs, trade restrictions and broader supply-chain disruptions could cause operational delays and raise its procurement and operating costs, and it depends on third parties — including key suppliers of network equipment, devices and services — whose failure to deliver could disrupt operations. It frames those input risks against a backdrop of geopolitical instability, citing the Ukraine-Russia, Iran-Israel and Israel-Hamas wars. The remaining thread is strategic: its competitive position rests on staying ahead in emerging network technology like AI-driven RAN and on FCC spectrum licenses won at auction to power its 5G network.
4 self-disclosed vulnerabilities, pulled from its own filings — each in the company’s words, with the source. This is the risk register almost nobody reads.
In its own words
What could break it.
Regulatory & policy
- tariffs/trade restrictions and supply-chain disruptions raising procurement and operating costsmedium
Adverse economic/market conditions including tariffs and trade restrictions, supply-chain disruptions, and trade-policy changes (higher tariffs, restrictions, other trade disincentives) could cause operational delays and higher procurement and operating costs and increased regulatory/compliance complexity for T-Mobile.
“operational delays, higher procurement and operational costs, and increased regulatory and compliance complexities, for example, as a result of changes to trade policies, including higher tariffs, restrictions and other economic disincentives to trade”
Supplier concentration
- dependence on third parties including key suppliers for products/services to operate the businessmedium
T-Mobile depends on third parties — including key suppliers — to provide products or services for the operation of its business (network equipment, devices, services); any failure or inability of these third parties to deliver could disrupt operations.
“any failure or inability of our third parties (including key suppliers) to provide products or services for the operation of our business”
SEC filing →As of 2026
Geographic concentration
- geopolitical-conflict exposure (Ukraine-Russia, Iran-Israel, Israel-Hamas) to supply chain/marketslow
T-Mobile cites geopolitical instability — the Ukraine-Russia, Iran-Israel and Israel-Hamas wars and further escalations — alongside inflation, interest rates, tariffs and supply-chain disruptions as adverse conditions that could affect its business, despite substantially all revenue and assets being U.S./Puerto Rico/USVI based.
“impacts of geopolitical instability, such as the Ukraine-Russia, Iran-Israel and Israel-Hamas wars and further escalations thereof; operational delays, higher procurement and operational costs”
SEC filing →As of 2026
Other disclosures
- network-technology evolution (5G/AI-RAN) and spectrum/FCC-license dependencelow
T-Mobile's competitive position depends on providing industry-leading network coverage/speed/reliability and on developing and deploying emerging network technologies (e.g., AI-driven Radio Access Networks) in a timely manner; it also depends on FCC spectrum licenses won at auction (e.g., Auction 108 2.5 GHz) to power its 5G network.
“the telecommunications industry evolves rapidly, and emerging technologies, such as AI-driven Radio Access Networks (“AI-RAN”) and the potential transiti[on]”
SEC filing →As of 2026
The hidden graph
Who it depends on, and who depends on it.
Relationships surfaced from filings — including ones disclosed by the other side, which is how the non-obvious ones come to light.
Its suppliers
“We also have strategic partnerships with third parties, such as T-Mobile, which enable us to sell our services and products to certain of their customers.”
Cited →“For the year ended December 31, 2025, our top four customers by total revenue were T-Mobile (18%), AT&T (17%), Verizon Wireless (14%) and Telefónica (10%).”
Cited →Telephone & Data Systems, Inc. (Array towers)
“Array's largest tenants include T-Mobile, AT&T and Verizon.”
Cited →“In fiscal years 2025 and 2024, our next largest customer, T-Mobile, accounted for 19.9% and 22.6% of our revenue, respectively.”
Cited →EQT AB (EQT Infrastructure)
“a fiber-to-the-home platform, from EQT's predecessor fund, EQT Infrastructure III. On April 1, 2025, we completed the joint acquisition of Lumos... During the three months ended June 30, 2025, we invested $932 million to acquire a 50% equity interest in the joint venture and 97,000 fiber customers.”
Cited →“Our largest tenants are T-Mobile, AT&T and Verizon Wireless, which collectively accounted for approximately 90% of our 2025 site rental revenues.”
Cited →SBA Communications Corporation
“For the year ended December 31, Percentage of Total Revenues 2025 2024 2023 T-Mobile 31.1% 30.5% 32.5%”
Cited →
In the MyPRIA app, this is checked against the companies you actually own.
← World Watch