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NORTHWEST PIPELINE LLC

For the period ended Dec 31, 2025. Filed Feb 24, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 24, 2026

WMB$67.46+1.5%Stored close · as of Nov 10, 2026

Extracted filing text, with the paragraph anchors used by the comparison.

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Contents

Item 3. Legal Proceedings

Environmental

Certain reportable legal proceedings involving governmental authorities under federal, state, and local laws regulating the discharge of materials into the environment are described below. While it is not possible for Williams to predict the final outcome of the proceedings that are still pending, it does not anticipate a material effect on its consolidated financial position if it received an unfavorable outcome in any one or more of such proceedings. Williams’ threshold for disclosing material environmental legal proceedings involving a governmental authority where potential monetary sanctions are involved is $1 million.

Other environmental matters called for by this Item are described under the caption “Environmental Matters” in Note 18 – Contingencies and Commitments included under Part II, Item 8. Financial Statements and Supplementary Data of this report, which information is incorporated by reference into this Item.

Other Litigation

The additional information called for by this Item is provided in Note 18 – Contingencies and Commitments included under Part II, Item 8. Financial Statements and Supplementary Data of this report, which information is incorporated by reference into this Item.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.