Other Events. On August 13, 2026, Duke Energy Corporation (the “Company”) consummated the issuance and sale of the securities described below pursuant to an underwriting agreement, dated August 10, 2026 (the “Underwriting Agreement”), with Barclays Capital Inc., BofA Securities, Inc. and Mizuho Securities USA LLC, as representatives of the several underwriters named therein (the “Underwriters”), pursuant to which the Company agreed to issue and sell to the Underwriters 40 ,000,000 equity unit…

. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized. DUKE ENERGY CORPORATION /s/ ABIGAIL L. MOTSINGER Abigail L. Motsinger Senior Vice President, Chief Accounting Officer and Controller Dated: August 4, 2026

. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized. DUKE ENERGY CORPORATION /s/ ABIGAIL L. MOTSINGER Abigail L. Motsinger Senior Vice President, Chief Accounting Officer and Controller Dated: May 5, 2026

Completion of Acquisition or Disposition of Assets. As previously disclosed in a Current Report on Form 8-K filed with the U.S. Securities and Exchange Commission (the “SEC”) on July 29, 2025 by Duke Energy Corporation (“Duke Energy”) and Piedmont Natural Gas Company, Inc., a North Carolina corporation (“Piedmont”) and wholly owned subsidiary of Duke Energy, Piedmont entered into an Asset Purchase Agreement by and between Piedmont and Spire Tennessee Inc., a Delaware corporation and successor…

Entry into a Material Definitive Agreement. On March 16, 2026, Duke Energy Corporation (the “Corporation”), Duke Energy Carolinas, LLC, Duke Energy Florida, LLC, Duke Energy Indiana, LLC, Duke Energy Kentucky, Inc., Duke Energy Ohio, Inc., Duke Energy Progress, LLC, and Piedmont Natural Gas Company, Inc., entered into an Amendment No. 3 and Consent (the “Amendment”) to amend the existing Amended and Restated Credit Agreement dated as of March 18, 2022, among the Corporation and each of such s…

of this Current Report on Form 8-K. The Notes were sold to the Initial Purchasers in reliance on the exemption from the registration requirements provided by Section 4(a)(2) of the Securities Act for resale to persons reasonably believed to be qualified institutional buyers as defined in, and in reliance on, Rule 144A of the Securities Act. The Notes and the underlying shares of Common Stock issuable upon conversion of the Notes, if any, have not been and will not be registered under the Secu…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. On March 12, 2026, Duke Energy Corporation (the “Corporation”) completed the sale of $1,500,000,000 aggregate principal amount of 3.000% Convertible Senior Notes due 2029 (the “Notes”), which included an additional $200,000,000 aggregate principal amount of Notes purchased pursuant to the full exercise of the option granted to the Initial Purchasers (as defined herein) pursuant t…

Other Events. On March 10, 2026, Duke Energy Corporation issued a press release announcing the pricing of an upsized private placement of $1,300,000,000 principal amount of 3.000% Convertible Senior Notes due 2029 (the “convertible notes”). The size of the offering was increased from the previously announced $1,000,000,000 aggregate principal amount of convertible notes. A copy of the press release is filed as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

Other Events. On March 9, 2026, Duke Energy Corporation issued a press release announcing the launch of a private placement of $1,000,000,000 principal amount of its Convertible Senior Notes due 2029. A copy of the press release is filed as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

Entry into a Material Definitive Agreement. On March 6, 2026, Duke Energy Corporation (the “Company”) entered into an Equity Distribution Agreement dated March 6, 2026 (the “Equity Distribution Agreement”) with Barclays Capital Inc., BMO Capital Markets Corp., BNY Mellon Capital Markets, LLC, BofA Securities, Inc., BTIG, LLC, CIBC World Markets Corp., Citigroup Global Markets Inc., Citizens JMP Securities, LLC, Fifth Third Securities, Inc., Goldman Sachs & Co. LLC, Huntington Securities, Inc.…

Entry into a Material Definitive Agreement. On March 3, 2026, in connection with the First Closing, Investor, Florida Progress and Progress Energy entered into an Amended and Restated Limited Liability Company Operating Agreement of Florida Progress (the “LLC Agreement”). The LLC Agreement, among other things, establishes the general framework governing the relationship between Investor and Progress Energy, and their respective successors and transferees, as members of Florida Progress and wi…

Forward-Looking Information This document includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Exchange Act. Forward-looking statements are based on management’s beliefs and assumptions. These forward-looking statements are identified by terms and phrases such as "anticipate," "believe," "intend," "estimate," "expect," "continue," "should," "could," "may," "plan," "project," "predict," "will," "potential," "forecast," "targ…

Regulation FD Disclosure. As previously disclosed, on August 4, 2025, Duke Energy Corporation (“Duke Energy”), Progress Energy, Inc. and Florida Progress, LLC (“Florida Progress”) entered into an Investment Agreement (the “Investment Agreement”) with Peninsula Power Holdings L.P., an affiliate of Brookfield Super-Core Infrastructure Partners (“Investor”), pursuant to which Florida Progress agreed to issue to Investor, and Investor agreed to acquire from Florida Progress, certain newly issued…

. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized. DUKE ENERGY CORPORATION /s/ CYNTHIA S. LEE Cynthia S. Lee Senior Vice President, Chief Accounting Officer and Controller Dated: February 10, 2026

Chief Accounting Officer — Cynthia S. Lee: The filing announces the planned retirement of the Chief Accounting Officer with a named internal successor, representing an orderly succession rather than a sudden loss of executive talent.

. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized. DUKE ENERGY CORPORATION /s/ CYNTHIA S. LEE Cynthia S. Lee Senior Vice President, Chief Accounting Officer and Controller Dated: November 7, 2025

Director — Jeffrey Guldner: The filing discloses the appointment of a new independent director to the Board of Directors, which is a routine governance event and not a departure of a sitting executive.

Other Events. On September 11, 2025, Duke Energy Corporation (the “Company”) consummated the issuance and sale of the securities described below pursuant to an underwriting agreement, dated September 8, 2025 (the “Underwriting Agreement”), with Citigroup Global Markets Inc., Goldman Sachs & Co. LLC, Mizuho Securities USA LLC, MUFG Securities Americas Inc., PNC Capital Markets LLC, Truist Securities, Inc., and Wells Fargo Securities, LLC, as representatives of the several underwriters named th…

. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized. DUKE ENERGY CORPORATION /s/ CYNTHIA S. LEE Cynthia S. Lee Senior Vice President, Chief Accounting Officer and Controller Dated: August 5, 2025

Entry into a Material Definitive Agreement. On August 4, 2025, Duke Energy Corporation (“Duke Energy”), Progress Energy, Inc. (“PEI”) and Florida Progress, LLC (“Florida Progress”) entered into an Investment Agreement (the “Investment Agreement”) with Peninsula Power Holdings L.P., a Delaware limited partnership, an affiliate of Brookfield Super-Core Infrastructure Partners (“Investor”), pursuant to which Florida Progress agreed to issue to Investor, and Investor agreed to acquire from Florid…

Entry into a Material Definitive Agreement. On July 27, 2025, Piedmont Natural Gas Company, Inc., a North Carolina corporation (“Piedmont”) and wholly owned subsidiary of Duke Energy Corporation (“Duke Energy”), entered into an Asset Purchase Agreement (the “Purchase Agreement”) by and between Piedmont and Spire Inc., a Missouri corporation (“Buyer”), pursuant to which Piedmont has agreed to sell its Tennessee natural gas local distribution company business (the “Business”) to Buyer (the “Tra…

. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized. DUKE ENERGY CORPORATION /s/ CYNTHIA S. LEE Cynthia S. Lee Senior Vice President, Chief Accounting Officer and Controller Dated: May 6, 2025

CEO — Julia S. Janson: The CEO of a major subsidiary is retiring with a planned transition of responsibilities, indicating an orderly succession rather than a sudden loss.

Entry into a Material Definitive Agreement. On March 14, 2025, Duke Energy Corporation (the “Corporation”), Duke Energy Carolinas, LLC, Duke Energy Florida, LLC, Duke Energy Indiana, LLC, Duke Energy Kentucky, Inc., Duke Energy Ohio, Inc., Duke Energy Progress, LLC, and Piedmont Natural Gas Company, Inc., entered into an Amendment No. 2 and Consent (the “Amendment”) to amend the existing Amended and Restated Credit Agreement dated as of March 18, 2022, among the Corporation and each of such s…

. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized. DUKE ENERGY CORPORATION /s/ CYNTHIA S. LEE Cynthia S. Lee Senior Vice President, Chief Accounting Officer and Controller Dated: February 13, 2025