0001868275-26-000077 | 11-K | XBRL Viewer | Constellation Energy Corp

Plan Termination	12 Months Ended
Dec. 31, 2025
EBP 006
Document Information [Line Items]
Plan Termination	Plan Termination The Plan may be amended, modified, or terminated by Constellation at any time. Termination of the Plan with respect to a participating employer may occur if there is no successor employer in the event of dissolution, merger, consolidation, or reorganization of such employer company. In the event of full or partial termination of the Plan, assets of affected participants of the terminating employer or employers shall remain 100% vested and distributable at fair market value in the form of cash, securities, or annuity contracts, in accordance with the provisions of the Plan.

Income Tax Status	12 Months Ended
Dec. 31, 2025
EBP 006
EBP, Tax Status [Line Items]
Income Tax Status	Income Tax Status The Plan has received a favorable determination letter dated October 28, 2024, from the IRS confirming that the Plan and related Trust are designed in accordance with the applicable section of the Code). While the Plan has since been amended, the Plan Administrator believes that the Plan design remains in compliance with the applicable requirements of the IRC. Therefore, it is believed that the Plan is designed and is currently being operated in compliance with the applicable requirements of the IRC. GAAP requires plan management to evaluate tax positions taken by the Plan and recognize a tax liability (or asset) if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the applicable authorities. The Company has analyzed the tax positions taken by the Plan and has concluded that as of December 31, 2025, there were no uncertain tax positions taken. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress.

SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Tables)

12 Months Ended

Dec. 31, 2025

EBP 006

EBP, Schedule of Asset Held for Investment [Line Items]

SCHEDULE OF ASSETS (HELD AT END OF YEAR)

CONSTELLATION EMPLOYEE SAVINGS PLAN

SCHEDULE OF ASSETS (HELD AT END OF YEAR)

As of December 31, 2025

Schedule H, Item 4i of Form 5500

Employer Identification Number 23-3064219, Plan #006

(c)

Description of Investment

(b)

Including Maturity Date, Rate

(e)

Identity of Issue, Borrower, Lessor,

of Interest, Collateral

Current

(a)

or Similar Party

Par or Maturity Value

Value

Constellation Stock Fund

582,180,692

Vanguard Mid Cap Equity Growth Index Fund

Registered Investment Companies

41,235,858

Vanguard Mid Cap Equity Value Index Fund

Registered Investment Companies

16,365,955

Vanguard Emerging Markets Equity Index Fund

Registered Investment Companies

33,247,214

Target Retirement 2015 Fund

Collective Trust Funds

129,675,475

Target Retirement 2020 Fund

Collective Trust Funds

242,382,320

Target Retirement 2025 Fund

Collective Trust Funds

328,408,377

Target Retirement 2030 Fund

Collective Trust Funds

349,161,243

Target Retirement 2035 Fund

Collective Trust Funds

325,866,144

Target Retirement 2040 Fund

Collective Trust Funds

347,459,561

Target Retirement 2045 Fund

Collective Trust Funds

325,134,792

Target Retirement 2050 Fund

Collective Trust Funds

212,941,207

Target Retirement 2055 Fund

Collective Trust Funds

147,601,931

Target Retirement 2060 Fund

Collective Trust Funds

52,298,142

Target Retirement 2065 Fund

Collective Trust Funds

15,382,834

Target Retirement Income Fund

Collective Trust Funds

153,659,784

BlackRock Global Aggregate Index

Collective Trust Funds

3,846,632

BlackRock Large Cap Equity (Russell 1000) Growth Fund

Collective Trust Funds

313,076,902

BlackRock Large Cap Equity (Russell 1000) Value Fund

Collective Trust Funds

63,286,200

BlackRock Small Cap Equity (Russell 2000) Growth Index Fund

Collective Trust Funds

28,078,515

BlackRock Small Cap Equity (Russell 2000) Value Index Fund

Collective Trust Funds

15,545,604

BlackRock Developed Intl (MSCI EAFE) Small Cap Equity Index Fund

Collective Trust Funds

10,806,184

BlackRock Intermediate Government Bond Index Fund

Collective Trust Funds

22,916,282

BlackRock MSCI All Country World Index

Collective Trust Funds

155,994,628

Blackrock U.S. Equity Index Fund

Collective Trust Funds

1,447,209,842

Blackrock U.S. Debt Index Fund

Collective Trust Funds

199,298,852

BlackRock Mid Cap Equity Index Fund

Collective Trust Funds

72,877,847

BlackRock Small Cap Equity (Russell 2000) Index Fund

Collective Trust Funds

18,840,547

BlackRock Developed Intl (MSCI EAFE) Equity Index Fund

Collective Trust Funds

77,062,163

BlackRock All Country World (MSCI ACWI IMI) Equity Index Fund

Collective Trust Funds

34,126,881

BlackRock U.S. Treasury Inflation Protected Securities Fund

Collective Trust Funds

20,407,451

BlackRock Developed Real Estate Index Fund

Collective Trust Funds

11,585,025

U.S. Equity Fund

Collective Trust Funds

405,952,995

International Equity Fund

Collective Trust Funds

141,924,720

Fixed Income Fund

Collective Trust Funds

101,528,511

Northern Trust U.S. Government Short-Term Investment Fund

Collective Trust Funds

311,602,973

Northern Trust Clearing (Short-Term Investment Fund)

Collective Trust Funds

9,624,664

Total Investments at Fair Value:

6,768,594,947

Notes receivable from participants

Interest rates: 3.50% - 10.50%

63,837,510

Total assets

6,832,432,457

Represents party-in-interest

Column (d), cost, has been omitted as investments are participant - directed.

Related Party Transactions	12 Months Ended
Dec. 31, 2025
EBP 006
EBP, Related Party and Party-in-Interest Transactions [Line Items]
Related Party Transactions	Related Party Transactions Investment options in the Plan include collective trust funds managed by the Trustee or its affiliates. A portion of the Plan’s assets are invested in shares of Constellation’s common stock and the Plan allows for loans that are notes receivable from participants. These transactions qualify as exempt party-in-interest transactions, in accordance with ERISA. There have been no known prohibited transactions with a party-in-interest.

SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) - EBP 006	12 Months Ended
	Dec. 31, 2025 USD ($)
EBP, Schedule of Asset Held for Investment [Line Items]
Entity tax identification number	23-3064219
Plan number	006
Total Investments at Fair Value:	$ 6,768,594,947
Notes receivable from participants	63,837,510
Total assets	$ 6,832,432,457
Minimum
EBP, Schedule of Asset Held for Investment [Line Items]
Notes receivable from participant, interest rate	3.50%
Maximum
EBP, Schedule of Asset Held for Investment [Line Items]
Notes receivable from participant, interest rate	10.50%
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock All Country World (MSCI ACWI IMI) Equity Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	$ 34,126,881
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Developed Intl (MSCI EAFE) Equity Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	77,062,163
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Developed Intl (MSCI EAFE) Small Cap Equity Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	10,806,184
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Developed Real Estate Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	11,585,025
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Global Aggregate Index
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	3,846,632
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Intermediate Government Bond Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	22,916,282
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Large Cap Equity (Russell 1000) Growth Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	313,076,902
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Large Cap Equity (Russell 1000) Value Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	63,286,200
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock MSCI All Country World Index
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	155,994,628
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Mid Cap Equity Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	72,877,847
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Small Cap Equity (Russell 2000) Growth Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	28,078,515
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Small Cap Equity (Russell 2000) Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	18,840,547
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock Small Cap Equity (Russell 2000) Value Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	15,545,604
Investment, Identifier [Axis]: Collective Trust Funds \| BlackRock U.S. Treasury Inflation Protected Securities Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	20,407,451
Investment, Identifier [Axis]: Collective Trust Funds \| Blackrock U.S. Debt Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	199,298,852
Investment, Identifier [Axis]: Collective Trust Funds \| Blackrock U.S. Equity Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	1,447,209,842
Investment, Identifier [Axis]: Collective Trust Funds \| Fixed Income Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	101,528,511
Investment, Identifier [Axis]: Collective Trust Funds \| International Equity Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	141,924,720
Investment, Identifier [Axis]: Collective Trust Funds \| Northern Trust Clearing (Short-Term Investment Fund)
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	9,624,664
Investment, Identifier [Axis]: Collective Trust Funds \| Northern Trust U.S. Government Short-Term Investment Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	311,602,973
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2015 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	129,675,475
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2020 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	242,382,320
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2025 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	328,408,377
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2030 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	349,161,243
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2035 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	325,866,144
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2040 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	347,459,561
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2045 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	325,134,792
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2050 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	212,941,207
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2055 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	147,601,931
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2060 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	52,298,142
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement 2065 Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	15,382,834
Investment, Identifier [Axis]: Collective Trust Funds \| Target Retirement Income Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	153,659,784
Investment, Identifier [Axis]: Collective Trust Funds \| U.S. Equity Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	405,952,995
Investment, Identifier [Axis]: Constellation Stock Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	582,180,692
Investment, Identifier [Axis]: Registered Investment Companies \| Vanguard Emerging Markets Equity Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	33,247,214
Investment, Identifier [Axis]: Registered Investment Companies \| Vanguard Mid Cap Equity Growth Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	41,235,858
Investment, Identifier [Axis]: Registered Investment Companies \| Vanguard Mid Cap Equity Value Index Fund
EBP, Schedule of Asset Held for Investment [Line Items]
Total Investments at Fair Value:	$ 16,365,955

Fair Value Measurements (Details) - EBP 006 - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 6,768,595	$ 5,850,242
Total
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	673,030	460,409
Total \| Constellation Stock fund
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	582,181	383,094
Total \| Registered investment companies
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	90,849	77,315
Level 1
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	673,030	460,409
Level 1 \| Constellation Stock fund
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	582,181	383,094
Level 1 \| Registered investment companies
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	90,849	77,315
Level 2
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Level 2 \| Constellation Stock fund
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Level 2 \| Registered investment companies
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Level 3
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Level 3 \| Constellation Stock fund
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Level 3 \| Registered investment companies
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	0	0
Investments valued at net asset value
EBP, Investment, Fair Value and NAV [Line Items]
Investments, at fair value	$ 6,095,565	$ 5,389,833

Summary of Significant Accounting Policies (Policies) - EBP 006	12 Months Ended
	Dec. 31, 2025
EBP, Accounting Policy [Line Items]
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires the Plan Administrator to make estimates and assumptions that affect the reported amounts of assets, liabilities, and changes therein, and disclosure of contingent assets and liabilities. Accordingly, actual results may differ from those estimates.
Investment Valuation and Income Recognition	Investment Valuation and Income Recognition Investments are reported at fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note 3 for discussion of fair value measurements. Purchases and sales of investments are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation includes the Plan’s gains and losses on investments bought and sold as well as held during the year.
Plan Expenses	Plan Expenses A participant’s account balance will be charged with certain fees and expenses. Asset-based fees (e.g., management fees and other fund operating expenses) are used to cover the expenses related to running the investment fund and are generally deducted directly from a participant’s investment returns. The asset-based fees are included within the Net increase in fair value of investments line item in the Statement of Changes in Net Assets Available for Benefits. Plan administration fees, which may include certain direct expenses, cover the day-to-day expenses of administering the Plan and are covered by amounts deducted directly from participant accounts. Transaction-based fees also may be charged with respect to optional features offered under the Plan (e.g., loans) and are charged directly against a participant’s account balance. The plan administration and transaction-based fees are included within the Administrative expenses line item in the Statement of Changes in Net Assets Available for Benefits. Certain expenses of maintaining the Plan are paid by the Plan, unless otherwise paid by the Company. Expenses that are paid by the Company are excluded from these financial statements.
Notes Receivable from Participants	Notes Receivable from Participants Notes receivable from participants are valued at their unpaid principal balance plus any accrued but unpaid interest. Delinquent notes receivable from a participant are reclassified as distributions to participants as prescribed by the Plan; therefore, no allowance for credit losses has been recorded as of December 31, 2025 or 2024.

- Definition

Disclosure of accounting policy for use of estimate in preparation of financial statement of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References + Details

STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS - EBP 006 - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
ASSETS
Investments, at fair value	$ 6,768,595	$ 5,850,242
Receivables
Participant contributions	6,011	5,354
Employer contributions	64,640	60,703
Notes receivable from participants	63,838	61,180
Total receivables	134,489	127,237
Total assets	6,903,084	5,977,479
LIABILITIES
Accrued expenses	1,232	817
Total liabilities	1,232	817
NET ASSETS AVAILABLE FOR BENEFITS	$ 6,901,852	$ 5,976,662

Plan Description	12 Months Ended
Plan Description	Dec. 31, 2025
EBP 006
EBP, Description of Plan [Line Items]
Plan Description	Plan Description The following description of the Constellation Employee Savings Plan (the “Plan”) is provided for general information purposes only. Participants should refer to the Plan document for a more complete description of the Plan’s provisions. General The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), and the Internal Revenue Code of 1986, as amended (“IRC” or the “Code”). The Constellation Stock Fund is an investment option under the Plan invested primarily in the common stock of Constellation Energy Corporation (“common stock”) and is designed to be an Employee Stock Ownership Plan under Code Section 4975(e)(7). Constellation Energy Generation, LLC (“Constellation” or the “Company”), a subsidiary of Constellation Energy Corporation, is the sponsor of the Plan and administrator of the Plan (the “Plan Administrator”) acting through its Director, Employee Benefit Plans and Programs. The Plan Administrator has responsibility for the day-to-day administration of the Plan. Constellation, acting through the Constellation Corporate Investment Committee and other outside investment managers, is responsible for the selection and retention of the Plan’s investment options. State Street Global Advisors is the independent fiduciary for the common stock held in the Constellation Stock Fund. The Northern Trust Company is the Plan’s trustee (“Trustee”) and Northwest Plan Services, Inc. is the Plan’s recordkeeper (“Recordkeeper”). Eligibility and Participation Generally, all United States-based employees are eligible to elect to participate in the Plan except for those whose employment is subject to a collective bargaining agreement that does not provide for participation in the Plan. Newly hired employees that do not elect to participate within 90 days after they receive their automatic enrollment notice are automatically enrolled into the Plan as soon as administratively possible after the 90th day following receipt of their automatic enrollment notice with a pre-tax deferral no less than 5% of eligible pay per pay period and 1% increase each March 1, generally beginning with the second calendar year that begins after automatic enrollment first applies to the participant, until the rate reaches 10%. Contributions to the Plan made by employees who did not file an investment election generally will be automatically invested in the custom target retirement fund that corresponds to the participant’s anticipated retirement date (based on the participant’s birth date). A participant subject to automatic enrollment may elect within 90 days of the first automatic contribution to withdraw all automatic contributions adjusted for investment gains or losses. Such a withdrawal would be subject to federal income tax but not to any early withdrawal penalty. Additionally, the participant will forfeit any employer matching contributions made with respect to such automatic contributions. In accordance with the Setting Every Community Up for Retirement Enhancement Act of 2019 (the “SECURE Act”) and the SECURE 2.0 Act of 2022 (“SECURE 2.0 Act”), participants will begin receiving benefit payments no later than April 1 of the calendar year following the calendar year in which they attain age 73 (72 if they reached age 72 on or after January 1, 2020 and before January 1, 2023, or 70½ if they reached age 70½ before January 1, 2020). Participant Contributions Participants may elect to contribute on a pre-tax basis, an after-tax basis, a Roth basis, or combination of the three, between 1% and 50% (percentage varies for some represented employees based on the applicable collective bargaining agreement) of eligible pay each pay period. Contributions are subject to Code limitations. Participants may also contribute amounts representing distributions from other qualified plans (rollovers). Participants that attain age 50 or older before the end of the calendar year may elect to make additional “catch-up” contributions, as defined by the Code, to the Plan. Participants that attain age 60 to 63 during the calendar year have an additional catch-up contribution limit, as permitted under the SECURE Act 2.0.The participant must contribute up to the Plan’s pre-tax contribution limit or be contributing at the maximum base pay level in order to make catch-up contributions. Catch-up contributions are not credited with the Company’s fixed or profit-sharing matching contributions. Vesting of Participants’ Accounts Participants are always vested in their accounts. Company Contributions With respect to non-represented employees (except for (i) non-exempt craft or clerical employees hired or rehired before January 1, 2023 and assigned to Peach Bottom, Limerick, or Constellation Power Texas and (ii) non-exempt craft or clerical employees assigned to the Peach Bottom Nuclear Security Group), and certain represented employees, the Company match includes both a fixed and annual profit-sharing component for participants as follows: •Fixed Match - Constellation matches 60% of the first 5% of a participant’s eligible pay contributed per pay period by the employee for a maximum annual fixed match percentage of 3% of the participant’s eligible pay. •Profit-Sharing - Additionally, Constellation may make an annual profit-sharing match of 60% of the first 5% of a participant’s eligible pay contributed per pay period for up to an additional 3% of eligible pay contributed per pay period, based on specified performance goals established by the Compensation Committee of Constellation Energy Corporation’s Board of Directors. Generally, a participant must be employed on the last day of a calendar year to receive the profit-sharing match for that year. In the event a participant terminates employment during the calendar year due to death, long-term disability, or retirement (age 50 and completion of 10 years of service with the Company) or in the event a participant terminates employment with the Company and receives benefits under the severance plan, the participant will be eligible to receive a profit-sharing match. Any profit-sharing match will be contributed to the Plan after the end of each calendar year. Combined, the total employer match (fixed and profit-sharing) is an annual maximum of up to 6% of a participant’s eligible pay. The 2025 profit-sharing match contributed in 2026 was $33,176,393. The 2024 profit-sharing match contributed in 2025 was $36,220,971. With respect to non-represented, non-exempt craft or clerical employees hired or rehired before January 1, 2023 and assigned to Peach Bottom, Limerick, or Constellation Power Texas, and with respect to non-exempt craft or clerical employees assigned to the Peach Bottom Nuclear Security Group, the Company provides a fixed match of 100% of the first 5% of a participant’s eligible pay contributed per pay period. Effective January 1, 2023, with respect to non-represented, non-exempt craft or clerical employees hired or rehired on or after such date and assigned to Peach Bottom, Limerick, or Constellation Power Texas, the Company match includes both a fixed and annual profit-sharing component and determined in the same manner as provided to non-represented employees as described in the preceding paragraph. The Company provides an additional non-discretionary fixed contribution of 3% of eligible pay for employees within the Commercial Retail or Commercial Wholesale business who are eligible to participate in the Constellation Short-Term Incentive Award Program and are not eligible to participate in any Company-sponsored pension plan (except for purposes of receiving interest credits, as applicable). With respect to non-represented, non-craft employees hired or rehired on or after February 1, 2018 who are not eligible to participate in a Company-sponsored pension plan (except for purposes of receiving interest credits, as applicable), the Company provides an additional non-discretionary fixed contribution of 4% of eligible pay. Effective January 1, 2023, with respect to non-represented, non-exempt craft or clerical employees hired or rehired on or after such date and assigned to Peach Bottom, Limerick, or Constellation Power Texas, except those assigned to the Peach Bottom Nuclear Security Group, the Company provides an additional non-discretionary fixed contribution of 4% of eligible pay. Any non-discretionary fixed contribution will be contributed to the Plan after the end of each calendar year based on eligible pay determined as of the last day of the applicable plan year. For represented employees, employer matching contributions and profit sharing or non-discretionary fixed contributions, if applicable, vary based on the applicable collective bargaining agreement. Investment Options The Plan’s investments are fully participant-directed, and the Plan is designed to satisfy Section 404(c) of ERISA. The investment options include a menu of funds that include 12 custom Target Date Fund options, three actively managed custom funds, 19 passively managed funds, the Northern Trust U.S. Government Short-Term Investment Fund and the Constellation Stock Fund. Dividends and earnings received on all funds, with the potential exception of the Constellation Stock Fund, are automatically reinvested in the fund to which those earnings apply. Employee Stock Ownership Plan If a participant invests any portion of their account in the Constellation Stock Fund and is eligible to receive dividend distributions from the Plan, then the participant is deemed to have elected to have the dividends reinvested in the Constellation Stock Fund. If the participant prefers to receive any such dividends in cash, they can so elect by contacting the Recordkeeper. Dividends distributed to the participant in cash from the Plan are subject to income tax as a dividend but are not subject to an early withdrawal penalty. Participant Accounts Each participant’s account is credited with the participant’s contributions and allocations of (i) the Company’s corresponding contributions, (ii) account earnings and losses, and (iii) administrative fees and expenses. Allocations are generally based on either participant elections or account balances. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s vested account. Notes Receivable from Participants A participant upon application may borrow a portion of their account from the Plan. Only one loan is permitted to a participant in any calendar year with a maximum of five (three for most non-represented employees and one, two, or three for certain represented employees based on their applicable collective bargaining agreement) outstanding at any time. The aggregate amount of all outstanding loans may not exceed the lesser of (i) 50 percent of a participant’s vested account balance or (ii) $50,000 reduced by the highest outstanding balance of all their loans from the Plan during the 12 months before the date of the loan. The term of the loan repayment ranges up to 5 years for general purposes and up to 15 years for the purchase of a primary residence. The loans are secured by the balance in the participant’s account and bear interest at the prime rate for commercial loans plus 1%. Principal and interest is paid ratably through payroll deductions or direct payment, as applicable. If a participant defaults on the repayment of a loan, the loan will be considered a taxable distribution of the participant’s account and may be subject to an early withdrawal penalty. Withdrawals by Participants While Employed Generally, a participant may withdraw up to the entire balance of their after-tax contributions account once each calendar year; however, after making such a withdrawal, the participant must wait six months before making a new election to resume after-tax contributions to the Plan if the distribution is received by the participant before attainment of age 59½. A participant may also withdraw up to an amount equal to the balance in their rollover account. Among other reasons permitted under the Code and described in the Plan, participants that have attained the age of 59½ or require it to alleviate financial hardship as defined in the Code, may make withdrawals from their before-tax, catch-up, matching, Roth, Roth catch-up and Roth rollover contributions accounts. Some withdrawals may incur a 10% early withdrawal penalty. Regardless of age attained or financial hardships, while any loan to the participant remains outstanding, the maximum amount available for withdrawal shall be the balance in such account less the balance of all outstanding loans. Withdrawals are recorded when paid. Distributions upon Termination of Employment Upon termination of employment, including the retirement, total disability or death of a participant, a participant is entitled to the distribution of their entire account balance. Such distribution will be made, as elected by the participant, in the form of either a single lump-sum payment, an ad hoc partial distribution, or in substantially equal annual, quarterly, or monthly installments over any period specified by the participant, subject to meeting any restrictions required by applicable law, including but not limited to the minimum distribution requirements under the Code. If a participant elects installment payments, the participant can elect to change the amount, frequency, and number of payments. A participant also may elect ad hoc partial withdrawals. A participant may elect to defer distributions until age 73 (age 72 if they attained age 72 on or after January 1, 2020 and before January 1, 2023, and age 70½ if they attained age 70½ on or before December 31, 2019). If the value of a participant’s account is $1,000 or less, the participant will receive a lump sum distribution from the Plan upon termination of employment. If the value of a participant’s account is greater than $1,000, the participant can leave their account in the Plan. Generally, distributions will be taxed as ordinary income in the year withdrawn and may also be subject to an early withdrawal penalty if taken before age 59½, unless eligible rollover distributions are rolled over to another qualified plan or an Individual Retirement Account (“IRA”). A 20% mandatory federal income tax withholding applies to withdrawals that are eligible for rollover, but which are not directly rolled over to another qualified plan or an IRA. Distributions are recorded when paid. If a participant does not specify the form and timing of the participant’s distribution, the benefit generally will be paid in installments beginning no later than April 1 of the calendar year following the calendar year in which the participant attains age 73 (age 72 if they attained age 72 on or after January 1, 2020 and before January 1, 2023, and age 70½ if they attained age 70½ on or before December 31, 2019).

Plan Description (Details) - EBP 006	12 Months Ended		36 Months Ended	59 Months Ended
Plan Description (Details) - EBP 006	Dec. 31, 2025 USD ($) year fund loan	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) year fund loan	Dec. 31, 2022
EBP, Description of Plan [Line Items]
Automatic annual deferral rate, annual increase	1.00%
Employer contribution, fixed rate contribution, percentage	6.00%
Profit-sharing match eligibility, retirement age \| year	50		50
Profit-sharing match eligibility after retirement, years of service	10 years
Match contribution \| $	$ 33,176,393	$ 36,220,971
Number of custom target date funds \| fund	12		12
Number of actively managed custom funds \| fund	3		3
Number of passively managed funds \| fund	19		19
Number of loans allowed per year	1		1
Maximum number of loans allowed outstanding	5		5
Maximum number of loans allowed outstanding, non-represented employees	3		3
Maximum borrowing percentage	50.00%		50.00%
Maximum borrowing amount \| $	$ 50,000		$ 50,000
Time period for loans used to reduce maximum borrowing amount	12 months
General loan, maximum borrowing term	5 years
Primary residence, maximum borrowing term	15 years
Basis spread on rate	1.00%
Early withdrawal penalty percentage	10.00%
Cash-out limit \| $	$ 1,000
Fixed Rate Contribution
EBP, Description of Plan [Line Items]
Match percentage	60.00%
Percentage of employee eligible pay	5.00%
Employer contribution, fixed rate contribution, percentage	3.00%
Discretionary Profit Sharing Contribution
EBP, Description of Plan [Line Items]
Match percentage	60.00%
Percentage of employee eligible pay	5.00%
Employer contribution, fixed rate contribution, percentage	3.00%
Non-represented, Non-exempt Craft or Clerical Employees
EBP, Description of Plan [Line Items]
Match percentage	100.00%
Percentage of employee eligible pay	5.00%
Non-discretionary Fixed Contribution
EBP, Description of Plan [Line Items]
Percentage of employee eligible pay	3.00%		4.00%	4.00%
Minimum
EBP, Description of Plan [Line Items]
Automatic deferral rate	5.00%
Pretax, maximum annual compensation to total compensation, percentage	1.00%
Number of loans allowed outstanding, represented employees	1		1
Maximum
EBP, Description of Plan [Line Items]
Automatic deferral rate	10.00%
Pretax, maximum annual compensation to total compensation, percentage	50.00%
Number of loans allowed outstanding, represented employees	3		3

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2025

EBP 006

EBP, Investment, Fair Value and NAV [Line Items]

EBP, Investment, Fair Value and NAV

The following tables set forth by level, within the fair value hierarchy, the Plan's assets at fair value as of December 31, 2025 and 2024 were as follows:


(in thousands of dollars)	As of December 31, 2025
	Level 1		Level 2		Level 3		Total
Constellation Stock fund	$	582,181	$	—	$	—	$	582,181
Registered investment companies	90,849		—		—		90,849
Net investments in the fair value hierarchy	673,030		—		—		673,030
Investments valued at net asset value (a)	—		—		—		6,095,565
Total investments at fair value	$	673,030	$	—	$	—	$	6,768,595

(a) - Includes investments in Collective Trust Funds


(in thousands of dollars)	As of December 31, 2024
	Level 1		Level 2		Level 3		Total
Constellation Stock fund	$	383,094	$	—	$	—	$	383,094
Registered investment companies	77,315		—		—		77,315
Net investments in the fair value hierarchy	460,409		—		—		460,409
Investments valued at net asset value (a)	—		—		—		5,389,833
Total investments at fair value	$	460,409	$	—	$	—	$	5,850,242

(a) - Includes investments in Collective Trust Funds

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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+ Details

- Definition

Tabular disclosure of fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

+ References

+ Details

Fair Value Measurements

12 Months Ended

Dec. 31, 2025

EBP 006

EBP, Investment, Fair Value and NAV [Line Items]

Fair Value Measurements

The plan measures and classifies fair value measurements in accordance with the hierarchy as defined by GAAP. The hierarchy prioritizes inputs to the valuation techniques used to measure fair value into three levels as follows:

•Level 1 - quoted prices (unadjusted) in active markets for identical assets or liabilities that we could liquidate as of the reporting date.

•Level 2 - inputs other than quoted prices included within Level 1 that are directly observable for the asset or indirectly observable through corroboration with observable market data. The plan does not have any financial assets utilizing Level 2 inputs.

•Level 3 - unobservable inputs, such as internally developed pricing models for the asset due to little or no market activity for the asset. The Plan does not have any financial assets utilizing Level 3 inputs.

The valuation methods for each investment category are described below.

Constellation Stock Fund: The fair value of the Company stock is based on the closing price of the investment on the National Association of Securities Dealers Automated Quotations (“NASDAQ”) (Level 1 inputs). The Company’s shares of common stock are traded on the NASDAQ under the symbol “CEG”.

Registered Investment Companies: Registered investment companies (or mutual funds) are valued at the daily closing price as reported by the fund. Mutual funds held by the Plan are open-end mutual funds that are registered with the Securities and Exchange Commission. These funds are required to publish their daily net asset value (“NAV”) and to transact at that price (Level 1 inputs).

Collective Trust Funds: Collective trust funds represent investments held in pooled funds. The Plan’s interests in the collective trust funds are valued based on the NAV provided by the fund

sponsor. The NAV, as provided by the Trustee, is used as a practical expedient to estimate fair value. The NAV is based on the fair value of the underlying investments held by the fund less its liabilities. This practical expedient is not used when it is determined to be probable that the fund will sell the investment for an amount different than the reported NAV. In the event the Plan were to initiate a full redemption of the collective trust funds, the investment advisor reserves the right to temporarily delay withdrawal from the trust to ensure that securities liquidations will be carried out in an orderly business manner. There are no significant redemption restrictions or unfunded commitments on these investments. These funds also include cash associated with a clearing account which are invested in a collective short-term investment fund.

The following tables set forth by level, within the fair value hierarchy, the Plan's assets at fair value as of December 31, 2025 and 2024 were as follows:


(in thousands of dollars)	As of December 31, 2025
	Level 1		Level 2		Level 3		Total
Constellation Stock fund	$	582,181	$	—	$	—	$	582,181
Registered investment companies	90,849		—		—		90,849
Net investments in the fair value hierarchy	673,030		—		—		673,030
Investments valued at net asset value (a)	—		—		—		6,095,565
Total investments at fair value	$	673,030	$	—	$	—	$	6,768,595

(a) - Includes investments in Collective Trust Funds


(in thousands of dollars)	As of December 31, 2024
	Level 1		Level 2		Level 3		Total
Constellation Stock fund	$	383,094	$	—	$	—	$	383,094
Registered investment companies	77,315		—		—		77,315
Net investments in the fair value hierarchy	460,409		—		—		460,409
Investments valued at net asset value (a)	—		—		—		5,389,833
Total investments at fair value	$	460,409	$	—	$	—	$	5,850,242

(a) - Includes investments in Collective Trust Funds

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

The entire disclosure for fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, fair value measured at net asset value per share as practical expedient (NAV).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS - EBP 006 $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Contributions
Participant	$ 200,319
Employer	124,059
Participant rollovers	29,954
Total contributions	354,332
Investment Income
Dividend income	2,584
Interest income from notes receivable from participants	6,047
Net increase in fair value of investments	1,092,752
Total investment income	1,101,383
Total additions	1,455,715
DEDUCTIONS
Benefits paid to participants	526,934
Administrative expenses	3,591
Total deductions	530,525
Net increase	925,190
NET ASSETS AVAILABLE FOR BENEFITS
Beginning of year	5,976,662
End of year	$ 6,901,852

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2025
EBP 006
EBP, Accounting Policy [Line Items]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies General The accompanying financial statements have been prepared on the accrual basis of accounting, in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Use of Estimates The preparation of financial statements in conformity with GAAP requires the Plan Administrator to make estimates and assumptions that affect the reported amounts of assets, liabilities, and changes therein, and disclosure of contingent assets and liabilities. Accordingly, actual results may differ from those estimates. Investment Valuation and Income Recognition Investments are reported at fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note 3 for discussion of fair value measurements. Purchases and sales of investments are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Net appreciation includes the Plan’s gains and losses on investments bought and sold as well as held during the year. Plan Expenses A participant’s account balance will be charged with certain fees and expenses. Asset-based fees (e.g., management fees and other fund operating expenses) are used to cover the expenses related to running the investment fund and are generally deducted directly from a participant’s investment returns. The asset-based fees are included within the Net increase in fair value of investments line item in the Statement of Changes in Net Assets Available for Benefits. Plan administration fees, which may include certain direct expenses, cover the day-to-day expenses of administering the Plan and are covered by amounts deducted directly from participant accounts. Transaction-based fees also may be charged with respect to optional features offered under the Plan (e.g., loans) and are charged directly against a participant’s account balance. The plan administration and transaction-based fees are included within the Administrative expenses line item in the Statement of Changes in Net Assets Available for Benefits. Certain expenses of maintaining the Plan are paid by the Plan, unless otherwise paid by the Company. Expenses that are paid by the Company are excluded from these financial statements. Notes Receivable from Participants Notes receivable from participants are valued at their unpaid principal balance plus any accrued but unpaid interest. Delinquent notes receivable from a participant are reclassified as distributions to participants as prescribed by the Plan; therefore, no allowance for credit losses has been recorded as of December 31, 2025 or 2024. Recent Accounting Pronouncements As of December 31, 2025, there were no recently issued accounting standards not yet adopted which are expected to have a material effect on the Plan's financial statements.

Cover	12 Months Ended
Cover	Dec. 31, 2025
Document Information [Line Items]
Entity Registrant Name	CONSTELLATION ENERGY CORPORATION
Amendment Flag	false
Entity Central Index Key	0001868275
Document Type	11-K
EBP 006
Document Information [Line Items]
Entity Registrant Name	CONSTELLATION ENERGY CORPORATION
Amendment Flag	false
Entity Central Index Key	0001868275
Document Type	11-K

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2025
EBP 006
EBP, Subsequent Event [Line Items]
Subsequent Events	Subsequent EventsThe Plan’s management evaluated subsequent events through June 17, 2026, the date the financial statements were available to be issued and determined that there were no subsequent events to be recognized or disclosed in the financial statements.

Risks and Uncertainties	12 Months Ended
Risks and Uncertainties	Dec. 31, 2025
EBP 006
EBP, Risk and Uncertainty [Line Items]
Risks and Uncertainties	Risks and UncertaintiesThe Plan provides for various investment options in several investment securities and instruments. Investment securities are exposed to various risks, such as interest, market, liquidity, and credit risk. Due to the level of risks associated with certain investment securities and the level of uncertainty related to changes in the value of investment securities, it is at least reasonably possible that changes in values in the near term could materially affect participants’ account balances and the amounts reported in the Statement of Net Assets Available for Benefits and the Statement of Changes in Net Assets Available for Benefits.