Pennsylvania200 Energy WayKennett SquarePennsylvania19348-2473(833)883-01620001168165False00011681652026-06-252026-06-25

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
June 25, 2026
Date of Report (Date of earliest event reported)
Commission
File Number
Name of Registrant; State or Other Jurisdiction of Incorporation; Address of Principal Executive Offices; and Telephone NumberIRS Employer Identification Number
333-85496CONSTELLATION ENERGY GENERATION, LLC23-3064219
(a Pennsylvania limited liability company)
200 Energy Way
Kennett Square, Pennsylvania 19348-2473
(833) 883-0162
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:
Title of each classTrading Symbol(s)Name of each exchange on which registered
N/A
N/A
N/A
Indicate by check mark whether any of the registrants are emerging growth companies 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 any of the registrants have 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. ☐




Section 8 - Other Events
Item 8.01. Other Events

On June 25, 2026, Constellation Energy Generation, LLC (Constellation) announced that it had extended its offers (the Exchange Offers) to exchange any and all of the approximately $2.3 billion in aggregate principal amount of unregistered notes that the Company issued in privately placed offerings on January 15, 2026 for a like principal amount of notes with identical terms that have been registered under the Securities Act of 1933, as amended. The Exchange Offers will now expire at 5:00 p.m., New York City time, on July 10, 2026, unless further extended. A copy of the press release issued on June 25, 2026 announcing the extension of the Exchange Offers is attached hereto as Exhibit 99.1 and is incorporated herein by reference.


Section 9 - Financial Statements and Exhibits
Item 9.01. Financial Statements and Exhibits

(d) Exhibits.
Exhibit No.
Description
101
Cover Page Interactive Data File – the cover page XBRL tabs are embedded within the Inline XBRL document
104
The cover page from this Current Report on Form 8-K, formatted as Inline XBRL



SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Company has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
CONSTELLATION ENERGY GENERATION, LLC
/s/ Shane P. Smith
Shane P. Smith
Executive Vice President and Chief Financial Officer
Constellation Energy Generation, LLC

June 25, 2026



EXHIBIT INDEX
Exhibit No.
Description
101
Cover Page Interactive Data File – the cover page XBRL tabs are embedded within the Inline XBRL document
104
The cover page from this Current Report on Form 8-K, formatted as Inline XBRL


ATTACHMENTS / EXHIBITS

ATTACHMENTS / EXHIBITS

EX-99.1

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