WMB: 10-Q financial filing

wmb-20260930 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2026 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _____________ to _____________ The Williams Companies, Inc. Transcontinental Gas Pipe Line Company, LLC Northwest Pipeline LLC (Exact name of registrant as specified in its charter) Commission file number: State or Other Jurisdiction of Incorporation or Organization: IRS Employer Identification No.: The Williams Companies, Inc. 1-4174 Delaware 73-0569878 Transcontinental Gas Pipe Line Company, LLC 1-7584 Delaware 74-1079400 Northwest Pipeline LLC 1-7414 Delaware 26-1157701 Address of Principal Executive Offices: Zip Code: Registrant’s Telephone Number, Including Area Code: The Williams Companies, Inc. One Williams Center , Tulsa , Oklahoma 74172 800 - 945-5426 (800-WILLIAMS) Transcontinental Gas Pipe Line Company, LLC 2800 Post Oak Boulevard , Houston , Texas 77056 713 - 215-2000 Northwest Pipeline LLC One Williams Center , Tulsa , Oklahoma 74172 800 - 945-5426 NO CHANGE (Former name, former address and former fiscal year, if changed since last report) Securities registered pursuant to Section 12(b) of the Act: Title of Each Class Trading Symbol(s) Name of Each Exchange on Which Registered The Williams Companies, Inc. Common Stock, $1.00 par value WMB New York Stock Exchange Transcontinental Gas Pipe Line Company, LLC None None None Northwest Pipeline LLC None None None Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exch