Regulation FD Disclosure. In DT Midstream’s earnings release issued on July 30, 2026, DT Midstream also announced that its Board of Directors has declared a quarterly cash dividend of $0.88 per share of common stock. The dividend is payable to DT Midstream’s stockholders of record as of September 21, 2026, and is expected to be paid on October 15, 2026. DT Midstream is furnishing the SEC with its slide presentation issued July 30, 2026. A copy of the slide presentation is furnished as Exhibit…

Results of Operations and Financial Condition. DT Midstream, Inc. (“DT Midstream”) is furnishing the Securities and Exchange Commission with its earnings release issued July 30, 2026, announcing financial results for the quarter ended June 30, 2026. A copy of the earnings release, including supplemental financial information, is furnished as Exhibit 99.1 and incorporated by reference.

Executive Vice President and Chief Administrative Officer — Melissa Cox: Ms. Cox was terminated without cause from her position.

Results of Operations and Financial Condition. DT Midstream, Inc. (“DT Midstream”) is furnishing the Securities and Exchange Commission with its earnings release issued April 30, 2026, announcing financial results for the quarter ended March 31, 2026. A copy of the earnings release, including supplemental financial information, is furnished as Exhibit 99.1 and incorporated by reference.

Regulation FD Disclosure. In DT Midstream’s earnings release issued on April 30, 2026, DT Midstream also announced that its Board of Directors has declared a quarterly cash dividend of $0.88 per share of common stock. The dividend is payable to DT Midstream’s stockholders of record as of June 15, 2026, and is expected to be paid on July 15, 2026. DT Midstream is furnishing the SEC with its slide presentation issued April 30, 2026. A copy of the slide presentation is furnished as Exhibit 99.2…

Regulation FD Disclosure. In DT Midstream’s earnings release issued on February 19, 2026, DT Midstream also announced that its Board of Directors has declared a quarterly cash dividend of $0.88 per share of common stock. The dividend is payable to DT Midstream’s stockholders of record as of March 16, 2026, and is expected to be paid on April 15, 2026. DT Midstream is furnishing the SEC with its slide presentation issued February 19, 2026. A copy of the slide presentation is furnished as Exhib…

Results of Operations and Financial Condition. DT Midstream, Inc. (“DT Midstream”) is furnishing the Securities and Exchange Commission with its earnings release issued February 19, 2026, announcing financial results for the year ended December 31, 2025. A copy of the earnings release, including supplemental financial information, is furnished as Exhibit 99.1 and incorporated by reference.

Chairman of the Board — Robert Skaggs, Jr.: Mr. Skaggs resigned as Chairman of the Board but remains a board member, and Mr. Slater was appointed as Executive Chairman.

Results of Operations and Financial Condition. DT Midstream, Inc. (“DT Midstream”) is furnishing the Securities and Exchange Commission with its earnings release issued October 30, 2025, announcing financial results for the quarter ended September 30, 2025. A copy of the earnings release, including supplemental financial information, is furnished as Exhibit 99.1 and incorporated by reference.

Regulation FD Disclosure. DT Midstream is furnishing the SEC with its slide presentation issued October 30, 2025. A copy of the slide presentation is furnished as Exhibit 99.2 and incorporated herein by reference. In DT Midstream’s earnings release issued on October 30, 2025, DT Midstream also announced that its Board of Directors has declared a quarterly cash dividend of $0.82 per share of common stock. The dividend is payable to DT Midstream’s stockholders of record as of December 15, 2025,…

Chief Accounting Officer — Joseph P. Finland: An internal employee was promoted to Chief Accounting Officer while the CFO retained their title, representing a standard succession or role expansion rather than a loss of senior management.

Regulation FD Disclosure. DT Midstream is furnishing the SEC with its slide presentation issued July 31, 2025. A copy of the slide presentation is furnished as Exhibit 99.2 and incorporated herein by reference. In DT Midstream’s earnings release issued on July 31, 2025, DT Midstream also announced that its Board of Directors has declared a quarterly cash dividend of $0.82 per share of common stock. The dividend is payable to DT Midstream’s stockholders of record as of September 15, 2025, and…

Results of Operations and Financial Condition. DT Midstream, Inc. (“DT Midstream”) is furnishing the Securities and Exchange Commission with its earnings release issued July 31, 2025, announcing financial results for the quarter ended June 30, 2025. A copy of the earnings release, including supplemental financial information, is furnished as Exhibit 99.1 and incorporated by reference.

Results of Operations and Financial Condition. DT Midstream, Inc. (“DT Midstream”) is furnishing the Securities and Exchange Commission with its earnings release issued April 30, 2025, announcing financial results for the quarter ended March 31, 2025. A copy of the earnings release, including supplemental financial information, is furnished as Exhibit 99.1 and incorporated by reference.

Regulation FD Disclosure. DT Midstream is furnishing the SEC with its slide presentation issued April 30, 2025. A copy of the slide presentation is furnished as Exhibit 99.2 and incorporated herein by reference. In DT Midstream’s earnings release issued on April 30, 2025, DT Midstream also announced that its Board of Directors has declared a quarterly cash dividend of $0.82 per share of common stock. The dividend is payable to DT Midstream’s stockholders of record as of June 16, 2025, and is…

Results of Operations and Financial Condition. DT Midstream, Inc. (“DT Midstream”) is furnishing the Securities and Exchange Commission with its earnings release issued February 26, 2025, announcing financial results for the year ended December 31, 2024. A copy of the earnings release, including supplemental financial information, is furnished as Exhibit 99.1 and incorporated by reference.

Regulation FD Disclosure. In DT Midstream’s earnings release issued on February 26, 2025, DT Midstream also announced that its Board of Directors has declared a quarterly cash dividend of $0.82 per share of common stock. The dividend is payable to DT Midstream’s stockholders of record as of March 17, 2025, and is expected to be paid on April 15, 2025. DT Midstream is furnishing the SEC with its slide presentation issued February 26, 2025. A copy of the slide presentation is furnished as Exhib…

Completion of Acquisition or Disposition of Assets On December 31, 2024, DT Midstream, Inc. (the “Company”) successfully closed the previously announced acquisition by the Company and its wholly-owned subsidiary, DTM Interstate Transportation, LLC (“DTM Transportation” and together with the Company, the “DTM Parties”) in which, pursuant to the purchase and sale agreement dated November 19, 2024 (the “Purchase Agreement”) by and among the DTM Parties, ONEOK Partners Intermediate Limited Partne…

Entry into a Material Definitive Agreement. Amendment to Credit Agreement On December 12, 2024, DT Midstream, Inc. (the “Company”) entered into an Amendment No. 4 to Credit Agreement (the “Amendment”) amending certain of the terms of its Credit Agreement, dated as of June 10, 2021, among the Company, as borrower, the lenders and letter of credit issuers party thereto and Barclays Bank PLC, as administrative agent and collateral agent. The Amendment, among other things, extends the maturity da…

Entry into a Material Definitive Agreement. Indenture On December 6, 2024, in connection with the previously announced offering and issuance by DT Midstream, Inc. (the “Company”) of $650,000,000 in aggregate principal amount of the Company’s 5.800% senior secured notes due 2034 (the “Notes”), the Company entered into an Indenture (the “Indenture”), among the Company, certain subsidiary guarantors named therein (the “Guarantors”) and U.S. Bank Trust Company, National Association, as trustee (t…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information included in

Entry into a Material Definitive Agreement. Amendment to Credit Agreement On November 25, 2024, DT Midstream, Inc. (the “Company”) entered into an Amendment No. 3 to Credit Agreement (the “Amendment”) amending certain of the terms of its Credit Agreement, dated as of June 10, 2021, among the Company, as borrower, the lenders and letter of credit issuers party thereto and Barclays Bank PLC, as administrative agent and collateral agent. The Amendment makes certain modifications to the debt cove…

Entry into a Material Definitive Agreement. On November 20, 2024, DT Midstream, Inc., a Delaware corporation (the “Company”), entered into an underwriting agreement (the “Underwriting Agreement”) with Barclays Capital Inc. as representative (the “Representative”) of the several underwriters named therein (collectively, the “Underwriters”), relating to an underwritten public offering (the “Offering”) of 3,625,000 shares (the “Shares”) of the Company’s common stock, par value $0.01 per share (t…

Entry into a Material Definitive Agreement On November 19, 2024, DT Midstream, Inc. (the “Company”) and its wholly-owned subsidiary, DTM Interstate Transportation, LLC (“DTM Transportation” and together with the Company, the “DTM Parties”), entered into a purchase and sale agreement (the “Purchase Agreement”) with ONEOK Partners Intermediate Limited Partnership (“ONEOK Intermediate”) and Border Midwestern Company (“Border Midwestern,” and together with ONEOK Intermediate, the “ONEOK Parties”)…

Results of Operations and Financial Condition. DT Midstream, Inc. (“DT Midstream”) is furnishing the Securities and Exchange Commission with its earnings release issued October 29, 2024, announcing financial results for the quarter ended September 30, 2024. A copy of the earnings release, including supplemental financial information, is furnished as Exhibit 99.1 and incorporated by reference.