UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 1631, 2026

Commission file number	Exact Name of Registrant as Specified in its Charter, State or other Jurisdiction of Incorporation, Address of Principal Executive Offices, Zip Code, and Registrant's Telephone Number, Including Area Code	IRS Employer Identification No.
Commission File Number	Exact Name of Registrant as Specified in its Charter, State or other Jurisdiction of Incorporation, Address of Principal Executive Offices, Zip Code, and Registrant's Telephone Number, Including Area Code	IRS Employer Identification No.
1-32853	DUKE ENERGY CORPORATION (a Delaware corporation) 525 South Tryon Street Charlotte, North Carolina 28202 800-488-3853	20-2777218
1-4928	DUKE ENERGY CAROLINAS, LLC (a North Carolina limited liability company) 525 South Tryon Street Charlotte, North Carolina 28202 800-488-3853	56-0205520
1-3382	DUKE ENERGY PROGRESS, LLC (a North Carolina limited liability company) 411 Fayetteville Street Raleigh, North Carolina 27601 800-488-3853	56-0165465
1-3274	DUKE ENERGY FLORIDA, LLC(a Florida limited liability company) 299 First Avenue North St. Petersburg, Florida 33701 800-488-3853	59-0247770
1-1232	DUKE ENERGY OHIO, INC.(an Ohio corporation) 139 East Fourth Street Cincinnati, Ohio 45202 800-488-3853	31-0240030
1-3543	DUKE ENERGY INDIANA, LLC(an Indiana limited liability company) 1000 East Main Street Plainfield, Indiana 46168 800-488-3853	35-0594457
1-6196	PIEDMONT NATURAL GAS COMPANY, INC.(a North Carolina corporation) 525 South Tryon Street Charlotte, North Carolina 28202 800-488-3853	56-0556998

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

Registrant	Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Duke Energy	Common Stock, $0.001 par value	DUK	New York Stock Exchange LLC
Duke Energy	5.625% Junior Subordinated Debentures due September 15, 2078	DUKB	New York Stock Exchange LLC
Duke Energy	Depositary Shares, each representing a 1/1,000th interest in a share of 5.75% Series A Cumulative Redeemable Perpetual Preferred Stock, par value $0.001 per share	DUK PR A	New York Stock Exchange LLC
Duke Energy	3.10% Senior Notes due 2028	DUK 28A	New York Stock Exchange LLC
Duke Energy	3.85% Senior Notes due 2034	~~DUK34~~DUK 34	New York Stock Exchange LLC
Duke Energy	3.75% Senior Notes due 2031	DUK 31A	New York Stock Exchange LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 1.01. Entry into a Material Definitive Agreement.

Co-Registrant CIK	0000078460
Co-Registrant Amendment Flag	false
Co-Registrant Form Type	8-K
Co-Registrant DocumentPeriodEndDate	2026-03-31
Co-Registrant Written Communications	false
Co-Registrant Solicitating Materials	false
Co-Registrant PreCommencement Tender Offer	false
Co-Registrant PreCommencement Issuer Tender Offer	false
Co-Registrant Emerging Growth Company	false

OnItem ~~March 16, 2026, Duke Energy Corporation (the “Corporation”), Duke Energy Carolinas, LLC, Duke Energy Florida, LLC, Duke Energy Indiana, LLC, Duke Energy Kentucky, Inc~~2.,01 ~~Duke~~Completion 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,~~Acquisition ~~2022,~~or ~~among~~Disposition ~~the Corporation and each~~ of ~~such subsidiaries, as Borrowers, the lenders listed therein, and Wells Fargo Bank, National Association, as Administrative Agent and Swingline Lender~~Assets. ~~The Amendment, among other changes, extends the termination date of the credit facility from March 16, 2030 to March 16, 2031.~~

AAs ~~copy~~previously ofdisclosed ~~the~~in ~~Amendment~~a isCurrent Report on Form 8-K filed with asthe ~~Exhibit~~U.S. Securities and Exchange Commission (the “SEC”) on July 1029, 2025 by Duke Energy Corporation (“Duke Energy”) and Piedmont Natural Gas Company, Inc.1, ~~hereto~~a North Carolina corporation (“Piedmont”) and iswholly owned subsidiary ~~incorporated~~of Duke Energy, Piedmont entered into an Asset Purchase Agreement by ~~reference~~and ~~herein~~between Piedmont and Spire Tennessee Inc., ~~The~~a ~~foregoing~~Delaware ~~description~~corporation and successor-in-interest to Spire Inc., a Missouri corporation (“Buyer”), dated as of July 27, 2025 (the ~~Amendment~~“Purchase Agreement”). inSubject ~~this~~to ~~Item~~the ~~1.01~~terms isand ~~qualified~~conditions inset forth therein, Piedmont agreed to sell its ~~entirety~~Tennessee bynatural ~~reference~~gas local distribution company business to Buyer (the ~~full~~“Transaction”). ~~text~~On ofMarch 31, 2026, and pursuant to the ~~Amendment~~Purchase Agreement, Piedmont completed the Transaction for $2.48 billion in cash, subject to customary purchase price adjustments as set forth in the Purchase Agreement.

~~Item~~The 9unaudited pro forma financial information of Piedmont as of December 31, 2025, after giving effect to the Transaction, is filed as Exhibit 99.~~01.~~1 ~~Financial~~to ~~Statements~~this Current Report on Form 8-K and ~~Exhibits~~incorporated into this Item 2.01 by reference.

~~(d)~~The ~~Exhibits~~foregoing description of the Purchase Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Purchase Agreement, a copy of which was filed as Exhibit 2.1 to Piedmont’s Form 10-Q for the quarterly period ended September 30, 2025, filed on November 7, 2025, and is incorporated herein by reference.

~~10.1~~Item ~~Amendment No~~7.01 3Regulation ~~and~~FD ~~Consent, dated as of March 16, 2026, by and among Duke Energy Corporation, Duke Energy Carolinas, LLC, Duke Energy Ohio, Inc~~Disclosure., Duke Energy Indiana, LLC, Duke Energy Kentucky, Inc., Duke Energy Progress, LLC, Duke Energy Florida, LLC and Piedmont Natural Gas Company, Inc., the Lenders party thereto, the Issuing Lenders party thereto, and Wells Fargo Bank, National Association, as Administrative Agent and Swingline Lender.

~~104~~On ~~Cover~~March 31, ~~Page~~2026, ~~Interactive~~Duke ~~Data~~Energy ~~File~~issued ~~(embedded~~a ~~within~~press release announcing the ~~Inline~~completion ~~XBRL~~of ~~document)~~the Transaction. A copy of the press release is attached hereto as Exhibit 99.2.

~~SIGNATURE~~The information contained in this Item 7.01 (including Exhibit 99.2) is furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to the liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of Duke Energy under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act.

~~Pursuant~~Forward-Looking ~~to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned hereunto duly authorized.~~Information

	DUKE ENERGY CORPORATION
Date: March 16, 2026	DUKE ENERGY OHIO, INC.
	PIEDMONT NATURAL GAS COMPANY, INC.
	By:	/s/ Elizabeth H. Jones
		Elizabeth H. Jones
		Assistant Corporate Secretary
	DUKE ENERGY CAROLINAS, LLC
	DUKE ENERGY PROGRESS, LLC
	DUKE ENERGY FLORIDA, LLC
	DUKE ENERGY INDIANA, LLC
	By:	/s/ Elizabeth H. Jones
		Elizabeth H. Jones
		Assistant Secretary

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,” “target,” “outlook,” “guidance,” and similar expressions. Various factors may cause actual results to be materially different than the suggested outcomes within forward-looking statements; accordingly, there is no assurance that such results will be realized. These risks and uncertainties are identified and discussed in Duke Energy’s Form 10-K for the year ended December 31, 2025, and subsequent quarterly reports filed with the SEC and available at the SEC’s website at www.sec.gov. In light of these risks, uncertainties and assumptions, the events described in the forward-looking statements might not occur or might occur to a different extent or at a different time than Duke Energy has described. Duke Energy expressly disclaims an obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Co-Registrant CIK	0000030371
Co-Registrant Amendment Flag	false
Co-Registrant Form Type	8-K
Co-Registrant DocumentPeriodEndDate	2026-03-16
Co-Registrant Written Communications	false
Co-Registrant Solicitating Materials	false
Co-Registrant PreCommencement Tender Offer	false
Co-Registrant PreCommencement Issuer Tender Offer	false
Co-Registrant Emerging Growth Company	false

Item 9.01 Financial Statements and Exhibits.

Co-Registrant CIK	0000017797
Co-Registrant Amendment Flag	false
Co-Registrant Form Type	8-K
Co-Registrant DocumentPeriodEndDate	2026-03-16
Co-Registrant Written Communications	false
Co-Registrant Solicitating Materials	false
Co-Registrant PreCommencement Tender Offer	false
Co-Registrant PreCommencement Issuer Tender Offer	false
Co-Registrant Emerging Growth Company	false

(b) Pro forma financial information.

Co-Registrant CIK	0000037637
Co-Registrant Amendment Flag	false
Co-Registrant Form Type	8-K
Co-Registrant DocumentPeriodEndDate	2026-03-16
Co-Registrant Written Communications	false
Co-Registrant Solicitating Materials	false
Co-Registrant PreCommencement Tender Offer	false
Co-Registrant PreCommencement Issuer Tender Offer	false
Co-Registrant Emerging Growth Company	false

The following unaudited pro forma financial information of Piedmont, after giving effect to the Transaction, is attached hereto as Exhibit 99.1:

Co-Registrant CIK	0000020290
·	Unaudited Pro Forma Consolidated Balance Sheet of Piedmont as of December 31, 2025; and
Co-Registrant Amendment Flag	false
·	Unaudited Pro Forma Consolidated Statement of Operations for the Year Ended December 31, 2025.
Co-Registrant Form Type	8-K
Co-Registrant DocumentPeriodEndDate	2026-03-16
Co-Registrant Written Communications	false
Co-Registrant Solicitating Materials	false
Co-Registrant PreCommencement Tender Offer	false
Co-Registrant PreCommencement Issuer Tender Offer	false
Co-Registrant Emerging Growth Company	false

Co-Registrant CIK	0000081020
Co-Registrant Amendment Flag	false
Co-Registrant Form Type	8-K
Co-Registrant DocumentPeriodEndDate	2026-03-16
Co-Registrant Written Communications	false
Co-Registrant Solicitating Materials	false
Co-Registrant PreCommencement Tender Offer	false
Co-Registrant PreCommencement Issuer Tender Offer	false
Co-Registrant Emerging Growth Company	false

(d) Exhibits.

Co-Registrant CIK	0000078460
2.1	Asset Purchase Agreement, dated as of July 27, 2025, by and between Piedmont Natural Gas Company, Inc. and Spire Inc. (incorporated by reference to Exhibit 2.1 to the Quarterly Report on Form 10-Q of Piedmont Natural Gas Company, Inc. filed on November 7, 2025, File No. 001-6196).
Co-Registrant Amendment Flag	false
99.1	Unaudited Pro Forma Consolidated Financial Information of Piedmont Natural Gas Company, Inc.
Co-Registrant Form Type	8-K
99.2	Press Release, dated March 31, 2026, issued by Duke Energy Corporation.
Co-Registrant DocumentPeriodEndDate	2026-03-16
104	Cover Page Interactive Data File (embedded within the Inline XBRL document).
Co-Registrant Written Communications	false
Co-Registrant Solicitating Materials	false
Co-Registrant PreCommencement Tender Offer	false
Co-Registrant PreCommencement Issuer Tender Offer	false
Co-Registrant Emerging Growth Company	false

SIGNATURE

Pursuant to the requirements of the Securities 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
	PIEDMONT NATURAL GAS COMPANY, INC.

Date: April 1, 2026	By:	/s/ David S. Maltz
		David S. Maltz
		Vice President, Legal, Chief Governance Officer and Corporate Secretary

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