What The Williams Companies, Inc. told the SEC could break it.

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]”

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”

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.”

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.”