Director — David A. Thomas: The filing discloses the planned retirement of a long-serving director after 13 years, which is an orderly succession event rather than a sudden executive departure.

Results of Operations and Financial Condition. DTE Energy Company (“DTE Energy”) is furnishing the Securities and Exchange Commission (“SEC”) the financial statements for its indirect wholly-owned subsidiary, DTE Gas Company, for the quarter ended June 30, 2026. The financial statements were posted to DTE Energy's website at www.dteenergy.com on July 31, 2026. The financial statements are furnished as Exhibit 99.1 and incorporated herein by reference. In accordance with General Instruction B.…

Results of Operations and Financial Condition. DTE Energy Company (DTE Energy) is furnishing the Securities and Exchange Commission (SEC) with its earnings release issued July 28, 2026, announcing financial results for the quarter ended June 30, 2026. A copy of the earnings release and the slide presentation, including supplemental financial information, are furnished as Exhibits 99.1 and 99.2 and incorporated herein by reference.

Results of Operations and Financial Condition. DTE Energy Company (“DTE Energy”) is furnishing the Securities and Exchange Commission (“SEC”) the financial statements for its indirect wholly-owned subsidiary, DTE Gas Company, for the quarter ended March 31, 2026. The financial statements were posted to DTE Energy's website at www.dteenergy.com on May 1, 2026. The financial statements are furnished as Exhibit 99.1 and incorporated herein by reference. In accordance with General Instruction B.2…

Results of Operations and Financial Condition. DTE Energy Company (DTE Energy) is furnishing the Securities and Exchange Commission (SEC) with its earnings release issued April 30, 2026, announcing financial results for the quarter ended March 31, 2026. A copy of the earnings release and the slide presentation, including supplemental financial information, are furnished as Exhibits 99.1 and 99.2 and incorporated herein by reference.

Entry into a Material Definitive Agreement On March 16, 2026, the Board of Directors of DTE Energy Company (“DTE Energy”) approved execution of a Primary Supply Agreement (“PSA”) and a Clean Capacity Accelerator Agreement (“CCAA”) between DTE Energy’s wholly-owned subsidiary DTE Electric Company (“DTE Electric”) and Google LLC (“Customer”) a wholly owned subsidiary of Alphabet Inc. Under the terms of the PSA, DTE Electric will provide electric service at its standard industrial rate to Custom…

Results of Operations and Financial Condition. DTE Energy Company (“DTE Energy”) is furnishing the Securities and Exchange Commission (“SEC”) the financial statements for its indirect wholly-owned subsidiary, DTE Gas Company, for the year ended December 31, 2025. The financial statements were posted to DTE Energy's website at www.dteenergy.com on February 27, 2026. The financial statements are furnished as Exhibit 99.1 and incorporated herein by reference. In accordance with General Instructi…

Results of Operations and Financial Condition. DTE Energy Company (DTE Energy) is furnishing the Securities and Exchange Commission (SEC) with its earnings release issued February 17, 2026, announcing financial results for the year ended December 31, 2025. A copy of the earnings release and the slide presentation, including supplemental financial information, are furnished as Exhibits 99.1 and 99.2 and incorporated herein by reference.

The filing details the performance measures and metrics for the Annual Incentive Plan (AIP) and Long-Term Incentive Plan (LTIP).

COO — Mark W. Stiers: The COO is retiring with a planned transition to an advisory role, indicating an orderly succession rather than a sudden loss of executive leadership.

Entry into a Material Definitive Agreement On October 28, 2025, the Board of Directors of DTE Energy Company (“DTE Energy”) approved execution of a Primary Supply Agreement (“PSA”) and an Energy Storage Agreement (“ESA”) between DTE Energy’s wholly-owned subsidiary DTE Electric Company (“DTE Electric”) and Green Chile Ventures LLC (“Customer”) a wholly owned subsidiary of Oracle Corporation. Under the terms of the PSA, DTE Electric will provide approximately 1.4 gigawatts of electric service…

Results of Operations and Financial Condition. DTE Energy Company (“DTE Energy”) is furnishing the Securities and Exchange Commission (“SEC”) the financial statements for its indirect wholly-owned subsidiary, DTE Gas Company, for the quarter ended September 30, 2025. The financial statements were posted to DTE Energy's website at www.dteenergy.com on October 31, 2025. The financial statements are furnished as Exhibit 99.1 and incorporated herein by reference. In accordance with General Instru…

Results of Operations and Financial Condition. DTE Energy Company (DTE Energy) is furnishing the Securities and Exchange Commission (SEC) with its earnings release issued October 30, 2025, announcing financial results for the quarter ended September 30, 2025. A copy of the earnings release and the slide presentation, including supplemental financial information, are furnished as Exhibits 99.1 and 99.2 and incorporated herein by reference.

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

Entry into a Material Definitive Agreement. On October 22, 2025, each of DTE Energy Company ("DTE Energy"), DTE Electric Company ("DTE Electric") and DTE Gas Company ("DTE Gas") entered into a sixth amended and restated five-year unsecured revolving credit agreement (each, a "Facility") with a syndicate of lenders and Citibank, N.A. ("Citibank"), as Administrative Agent. The Facilities amend and restate each respective borrower's prior fifth amended and restated five-year revolving credit agr…

The filing discloses amendments to severance plans and the execution of new change-in-control and indemnification agreements, which are compensatory arrangements rather than actual personnel changes.

Results of Operations and Financial Condition. DTE Energy Company (“DTE Energy”) is furnishing the Securities and Exchange Commission (“SEC”) the financial statements for its indirect wholly-owned subsidiary, DTE Gas Company, for the quarter ended June 30, 2025. The financial statements were posted to DTE Energy's website at www.dteenergy.com on July 31, 2025. The financial statements are furnished as Exhibit 99.1 and incorporated herein by reference. In accordance with General Instruction B.…

Results of Operations and Financial Condition. DTE Energy Company (DTE Energy) is furnishing the Securities and Exchange Commission (SEC) with its earnings release issued July 29, 2025, announcing financial results for the quarter ended June 30, 2025. A copy of the earnings release and the slide presentation, including supplemental financial information, are furnished as Exhibits 99.1 and 99.2 and incorporated herein by reference.

CEO — Joi M. Harris: The filing announces the internal promotion of the President and COO to CEO, with the outgoing CEO transitioning to Executive Chairman, representing an orderly succession rather than a loss of leadership.

The filing reports the shareholder approval of a long-term incentive plan, which is a compensatory arrangement rather than a change in management personnel.

Results of Operations and Financial Condition. DTE Energy Company (“DTE Energy”) is furnishing the Securities and Exchange Commission (“SEC”) the financial statements for its indirect wholly-owned subsidiary, DTE Gas Company, for the quarter ended March 31, 2025. The financial statements were posted to DTE Energy's website at www.dteenergy.com on May 2, 2025. The financial statements are furnished as Exhibit 99.1 and incorporated herein by reference. In accordance with General Instruction B.2…

Results of Operations and Financial Condition. DTE Energy Company (DTE Energy) is furnishing the Securities and Exchange Commission (SEC) with its earnings release issued May 1, 2025, announcing financial results for the quarter ended March 31, 2025. A copy of the earnings release and the slide presentation, including supplemental financial information, are furnished as Exhibits 99.1 and 99.2 and incorporated herein by reference.

Results of Operations and Financial Condition. DTE Energy Company (“DTE Energy”) is furnishing the Securities and Exchange Commission (“SEC”) the financial statements for its indirect wholly-owned subsidiary, DTE Gas Company, for the year ended December 31, 2024. The financial statements were posted to DTE Energy's website at www.dteenergy.com on February 28, 2025. The financial statements are furnished as Exhibit 99.1 and incorporated herein by reference. In accordance with General Instructi…

The filing details the approval of performance metrics and weightings for the Annual Incentive Plan and Long-Term Incentive Plan, which is a compensatory arrangement rather than a change in management personnel.

Results of Operations and Financial Condition. DTE Energy Company (DTE Energy) is furnishing the Securities and Exchange Commission (SEC) with its earnings release issued February 13, 2025, announcing financial results for the year ended December 31, 2024. A copy of the earnings release and the slide presentation, including supplemental financial information, are furnished as Exhibits 99.1 and 99.2 and incorporated herein by reference.