WMB · CIK 107263
What The Williams Companies, Inc. told the SEC could break it.
Williams' disclosures describe a natural-gas pipeline business concentrated at both ends of its network. Its regulated pipelines lean on a limited set of customers — Northwest Pipeline's three largest were about 52% of its revenue, the top ten interstate customers about 44%, and its three biggest NGL marketing customers about 42% — so losing key shippers or contracted volumes would cut revenue. At the same time it depends on third-party interconnected pipelines and facilities outside its control for delivery options, and on a concentrated set of gas and NGL suppliers, while its interstate lines carry environmental remediation obligations (PCBs, mercury, Superfund PRP designations) and PHMSA integrity rules that can raise compliance costs.
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.
Supplier concentration
- dependence on third-party interconnected pipelines/facilities for delivery options (outside Williams' control)medium
Williams, Transco and NWP depend on third-party pipelines and other facilities interconnected to their systems for delivery options to/from their pipelines and storage — outside their control; if those interconnects become unavailable to transport or treat natural gas/NGLs, Williams' revenues could be adversely affected.
“Williams, Transco, and NWP depend upon third-party pipelines and other facilities that provide delivery options to and from their pipelines and storage facilities for the benefit of their customers that is outside Williams' Transco's, and NWP's control. If these pipelines or facilities were to become temporarily or permanently[ unavailable]”
SEC filing →As of 2026 - supplier-concentration risk on gas/NGL supply for Transco and NWPmedium
Williams, Transco and NWP face supplier-concentration risk; if they are unable to adequately diversify or otherwise mitigate such supplier-concentration risks and those risks are realized, the businesses could see reduced revenues and increased expenses with a material adverse effect on results.
“If Williams', Transco's, and NWP's businesses are unable to adequately diversify or otherwise mitigate such supplier concentration risks, and such risks were realized, such ... businesses could be subject to reduced revenues and increased expenses”
Customer concentration
- pipeline customer concentration — NWP top-3 ~52%, top-10 interstate ~44%, Transco top-3 ~22%, NGL marketing top-3 ~42%medium
Williams' regulated pipelines rely on a limited number of customers: NWP's three largest were ~52% of NWP operating revenues, Transco's three largest ~22%, the top-10 interstate customers ~44% of regulated transportation/storage revenues, and the three largest NGL marketing customers ~42% of NGL marketing sales — loss of key customers or contracted volumes could materially reduce revenue.
“NWP's three largest customers in 2025 accounted for approximately 52 percent of NWP total operating revenues.”
SEC filing →As of 2026
Litigation
- environmental remediation — PCB/mercury Superfund PRP designations; PHMSA pipeline-integrity regulationlow
Williams' interstate gas pipelines are in remediation/monitoring for PCBs, mercury and other hazardous substances and have been named a potentially responsible party at various Superfund sites ($11M accrued, ~$3M recoverable through rates); it is also subject to PHMSA gas integrity-management rules and a new pipeline final rule that could raise compliance costs/capex.
“Williams' interstate gas pipelines are involved in remediation and monitoring activities related to certain facilities and locations for polychlorinated biphenyls (PCBs), mercury, and other hazardous substances. These activities have involved the EPA and various state environmental authorities, resulting in Williams' identification as a potentially responsible party (PRP) at various Superfund waste sites.”
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
“Our customers include many of the leading energy and utility companies in the United States, such as; Xcel Energy, Pacific Gas & Electric, Southern California Gas, Oncor Electric, Duke Energy, Sempra Energy, Williams, Hecate Energy, Consumers Energy, Dominion, Valero, D.E. Shaw Renewable Investments”
Cited →
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