0001628280-26-045535 | 11-K | XBRL Viewer

Fair Value Measurements

12 Months Ended

Dec. 31, 2025

Fair Value Measurements [Line Items]

NOTE 6 – FAIR VALUE MEASUREMENTS

A fair value measurement is determined based on the assumptions that a market participant would use in pricing an asset or liability, based on a three-tiered hierarchy that draws a distinction between market participant assumptions based on (i) observable inputs, such as quoted prices in active markets (Level 1); (ii) inputs other than quoted prices in active markets that are observable either directly or indirectly (Level 2); and (iii) unobservable inputs that require the Master Trust to use present value and other valuation techniques in the determination of fair value (Level 3). Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measure. The Master Trust’s assessment of the significance of a particular input to fair value measurements requires judgment and may affect the valuation of the assets and liabilities being measured and their placement within the fair value hierarchy.

Financial assets held in the Master Trust and the valuation techniques for measuring fair value are as follows:

Registered Investment Companies (Mutual Funds): Registered investment companies (mutual funds) are valued at their respective net asset values. The net asset values are typically determined by the fund at the close of regular trading. These funds are required to publish their daily net asset value (NAV) and to transact at that price. The mutual funds are considered actively traded.

Common/Collective Trusts: Valued at the NAV of units of the collective trusts. The NAV, as provided by the trustee, is used as a practical expedient to estimate fair value. 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. Were the Plan to initiate a full redemption of the collective trusts, the investment adviser reserves the right to temporarily delay withdrawal from the trusts in order to ensure that securities liquidations will be carried out in an orderly business manner.

Common Stock: The Graham Holdings Company common stock in the Graham Holdings Company Stock Fund and Berkshire Hathaway common stock in the Berkshire Hathaway Stock Fund are valued at their year-end market value closing price.

The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Plan Sponsor believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

Financial assets held by the Master Trust measured at fair value on a recurring basis were as follows:


	As of December 31, 2025				As of December 31, 2024
	Fair Value		Quoted Prices in Active Markets for Identical Items (Level 1)		Fair Value		Quoted Prices in Active Markets for Identical Items (Level 1)
Assets:
Mutual funds	$	621,784,615	$	621,784,615	$	569,520,506	$	569,520,506
Berkshire Hathaway common stock	56,670,947		56,670,947		55,163,111		55,163,111
Graham Holdings Company common stock	5,236,005		5,236,005		4,318,069		4,318,069
Total	$	683,691,567	$	683,691,567	$	629,001,686	$	629,001,686
Common collective trusts (1)	389,436,813		—		345,424,320		—
Total financial assets	$	1,073,128,380	$	683,691,567	$	974,426,006	$	629,001,686

(1) In accordance with FASB ASC 820, Fair Value Measurement, certain investments that are measured at fair value using net asset value per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy. As a result, collective investment trusts are classified as a reconciling item in the fair value hierarchy so that the total investments in the fair value hierarchy is consistent with the Plan investments, at fair value on the Statements of Net Assets Available for Benefits.

For assets that are measured using quoted prices in active markets, the total fair value is the published market price per share/unit multiplied by the number of shares/units held.

Common Collective Trusts

The estimated fair value and redemption requirements of the Master Trust’s investment in common collective trust are summarized as follows:


	December 31,
	2025		2024		Unfunded commitments	Redemption frequency	Redemption notice

Target-date strategy funds	$	381,561,598	$	338,587,009	None	Daily	None
Target income strategy fund	7,875,215		6,837,311		None	Daily	None
Total	$	389,436,813	$	345,424,320

- 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.

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+ 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

+ Details

Master Trust

12 Months Ended

Dec. 31, 2025

EBP025 [Member]

Master Trust [Line Items]

Master Trust [Text Block]

NOTE 5 - GRAHAM HOLDINGS COMPANY MASTER TRUST

The Master Trust was established for the purpose of maintaining assets for the exclusive benefit of the participants of The Savings Plan for Graham Holdings Company, The Kaplan, Inc. Tax Deferred Savings Plan for Salaried Employees, and The 401(k) Savings Plan for GHC Affiliates (collectively, Participating Plans). Each Participating Plans’ specific interest in the Master Trust is based on the account balances of the participants and their elected investment options specific to each Plan. The Master Trust assets are allocated among the Participating Plans by assigning to each Participating Plan the entire amount of contributions received on behalf of each Participating Plan, benefit payments, or other expenses attributed solely to such Participating Plan, and every other transaction relating only to such Participating Plan and by allocating among all Participating Plans, in proportion to the value of the assets assigned to each Participating Plan, income and expenses resulting from collective investment of the assets of the Master Trust.

The following table presents the net assets of the Master Trust:


	As of December 31, 2025				As of December 31, 2024
	Master Trust		Plan Interest in Master Trust		Master Trust		Plan Interest in Master Trust
Registered Investment Companies (Mutual Funds)	$	621,551,801	$	41,755,118	$	569,373,225	$	37,835,310
Common/Collective Trusts	389,436,814		40,874,521		345,424,320		35,403,793
Berkshire Hathaway Stock Fund	56,895,914		2,660,377		55,306,537		2,344,400
Graham Holdings Company Stock Fund	5,243,851		157,942		4,321,924		122,597
Total net assets	$	1,073,128,380	$	85,447,958	$	974,426,006	$	75,706,100

The following table presents the net appreciation in the fair value of investments and investment income for the Master Trust for the year ended December 31, 2025:



Net appreciation in fair value of investments	$	128,409,130
Interest and dividends	26,076,585
Total investment income	$	154,485,715

Refer to Note 6 for a description of the valuation methodologies used.

- 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.

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The entire disclosure for master trust arrangement in which employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) participates.

+ References

+ Details

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2025

EBP025 [Member]

Fair Value Measurements [Line Items]

Fair Value Measurements [Table Text Block]

Financial assets held by the Master Trust measured at fair value on a recurring basis were as follows:


	As of December 31, 2025				As of December 31, 2024
	Fair Value		Quoted Prices in Active Markets for Identical Items (Level 1)		Fair Value		Quoted Prices in Active Markets for Identical Items (Level 1)
Assets:
Mutual funds	$	621,784,615	$	621,784,615	$	569,520,506	$	569,520,506
Berkshire Hathaway common stock	56,670,947		56,670,947		55,163,111		55,163,111
Graham Holdings Company common stock	5,236,005		5,236,005		4,318,069		4,318,069
Total	$	683,691,567	$	683,691,567	$	629,001,686	$	629,001,686
Common collective trusts (1)	389,436,813		—		345,424,320		—
Total financial assets	$	1,073,128,380	$	683,691,567	$	974,426,006	$	629,001,686

The estimated fair value and redemption requirements of the Master Trust’s investment in common collective trust are summarized as follows:


	December 31,
	2025		2024		Unfunded commitments	Redemption frequency	Redemption notice

Target-date strategy funds	$	381,561,598	$	338,587,009	None	Daily	None
Target income strategy fund	7,875,215		6,837,311		None	Daily	None
Total	$	389,436,813	$	345,424,320

- 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

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

Schedule of Assets (Details) - EBP025 [Member]	12 Months Ended
Schedule of Assets (Details) - EBP025 [Member]	Dec. 31, 2025 USD ($)
Schedule of Assets [Line Items]
Entity Tax Identification Number	53-0182885
Plan Number	025
Party-in-Interest [true false]	true
Plan Interest in Master Trust, Participation Status [Extensible Enumeration]	EBP, Participant-Directed [Member]
Interest in Master Trust	$ 85,447,958
Participant loans	1,102,008
Total Assets Held at End of Year	$ 86,549,966
Minimum [Member]
Schedule of Assets [Line Items]
Participant loans interest rate	4.25%
Maximum [Member]
Schedule of Assets [Line Items]
Participant loans interest rate	9.50%
Investment, Identifier [Axis]: Graham Holdings Company Master Trust
Schedule of Assets [Line Items]
Issuer Name [Extensible Enumeration]	Graham Holdings Company Master Trust [Member]

Description of Plan (Details) - EBP025 [Member]	12 Months Ended
Description of Plan (Details) - EBP025 [Member]	Dec. 31, 2025 USD ($) loan
Description of Plan [Line Items]
Minimum amount of account balance that may not be deferred and are subject to automotic rollover/cash out	$ 1,000
Maximum amount of account balance that may not be deferred and are subject to automotic rollover/cash out	7,000
Amount of account balance that may not be deferred and may be subject to potential rollover/cash out	$ 7,000
Automatic annual increase increment, Option 1	1.00%
Automatic annual increase increments, Option 2	2.00%
Automatic annual increase increments, Option 3	3.00%
Employer contribution matching percentage	100.00%
Discretionary contribution amount	$ 0
Number of active loans \| loan	1
Maximum percentage of account balance participant may borrow	50.00%
Minimum borrowing amount	$ 1,000
Maximum borrowing amount	$ 50,000
Employer Common Stock Fund [Member]
Description of Plan [Line Items]
Maximum percentage of employee contributions to single investment	20.00%
Berkshire Hathaway Stock Fund [Member]
Description of Plan [Line Items]
Maximum percentage of employee contributions to single investment	25.00%
Maximum percentage of employer contribution to single investment	25.00%
Maximum percentage of total account balance in single investment	25.00%
Certain hourly and part-time employees [Member]
Description of Plan [Line Items]
Employer contribution participant compensation matched percentage	1.00%
Union employee [Member]
Description of Plan [Line Items]
Employer contribution participant compensation matched percentage	3.00%
Non-union employee [Member]
Description of Plan [Line Items]
Employer contribution participant compensation matched percentage	1.00%

Master Trust (Investment Income) (Details) - EBP025 [Member] - Master Trust [Member]	12 Months Ended
	Dec. 31, 2025 USD ($)
Master Trust [Line Items]
Net appreciation in fair value of investments	$ 128,409,130
Interest and dividends	26,076,585
Total investment income	$ 154,485,715

- 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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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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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/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 27: http://www.xbrl.org/2003/role/disclosureRef
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Reference 28: http://www.xbrl.org/2003/role/disclosureRef
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Fair Value Measurements (Financial assets held by the Master Trust) (Details) - EBP025 [Member] - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Master Trust [Line Items]
Investment, Fair Value	$ 85,447,958	$ 75,706,100
Plan interest in Graham Holdings Company Master Trust	85,447,958	75,706,100
Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	1,073,128,380	974,426,006
Level 1, Level 2, and Level 3 [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	683,691,567	629,001,686
Level 1 [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	683,691,567	629,001,686
Mutual Fund [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	621,551,801	569,373,225
Mutual Fund [Member] \| Level 1, Level 2, and Level 3 [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	621,784,615	569,520,506
Mutual Fund [Member] \| Level 1 [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	621,784,615	569,520,506
Nonemployer Common Stock [Member] \| Level 1, Level 2, and Level 3 [Member] \| Master Trust [Member] \| Berkshire Hathaway [Member]
Master Trust [Line Items]
Investment, Fair Value	56,670,947	55,163,111
Nonemployer Common Stock [Member] \| Level 1 [Member] \| Master Trust [Member] \| Berkshire Hathaway [Member]
Master Trust [Line Items]
Investment, Fair Value	56,670,947	55,163,111
Employer Common Stock [Member] \| Level 1, Level 2, and Level 3 [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	5,236,005	4,318,069
Employer Common Stock [Member] \| Level 1 [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	5,236,005	4,318,069
Common Collective Trust [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	389,436,814	345,424,320
Common Collective Trust [Member] \| Level 1 [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	0	0
Common Collective Trust [Member] \| Fair Value Measured at Net Asset Value Per Share [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	$ 389,436,813	$ 345,424,320

Summary of Accounting Policy (Policies) - EBP025 [Member]	12 Months Ended
	Dec. 31, 2025
Accounting Policy [Line Items]
Basis of Accounting [Policy Text Block]	Basis of Accounting The financial statements of the Plan are prepared using the accrual basis of accounting.
Use of Estimates [Policy Text Block]	Use of Estimates The preparation of financial statements, in conformity with GAAP, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein and disclosure of contingent assets and liabilities. Actual results could differ from those estimates.
Investment Valuation and Income Recognition [Policy Text Block]	Investment Valuation and Income Recognition The Plan is a participant in the Master Trust as described in Note 5. Investments held in the Master Trust are stated at fair value and are allocated to the Plan specifically in relation to the fair value of the assets assigned to the Plan. 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. The Committee determines the Master Trust’s valuation policies utilizing information provided by the trustee. See Note 6 for discussion of fair value measurements. Purchases and sales of investments in the Master Trust are recorded on a trade-date basis. Interest income is accrued when earned. Dividend income is recorded on the ex-dividend date. Capital gain distributions are included in dividend income. The Master Trust’s net appreciation includes the Master Trust’s gains and losses on investments bought and sold as well as held during the year. See Note 5 for the Plan’s interest in the Master Trust, as well as the Master Trust’s investment income.
Contributions [Policy Text Block]	Contributions Contributions from Plan participants and the Company Matching Contributions, if applicable, are recorded in the year in which the employee’s contributions are withheld from compensation.
Payment of Benefits [Policy Text Block]	Payment of Benefits Benefit payments to participants are recorded upon distribution.
Risks and Uncertainties [Text Block]	Risks and Uncertainties The Plan provides for various investment securities as investment options. Investment securities are exposed to various risks, such as interest, market, and credit risks. Market risks include global events which could impact the value of investment securities, such as a pandemic, international conflict, trade wars and tariffs. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect participant’s account balances and the amounts reported in the Statements of Net Assets Available for Benefits.
Subsequent Events [Policy Text Block]	Subsequent Events The Plan has evaluated subsequent events from December 31, 2025 through the date these financial statements were issued, and has determined that no material events occurred which require recognition or disclosure in the financial statements.

- 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

Statement of Net Asset Available for Benefit (Statement) - EBP025 [Member] - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Assets
Plan interest in Graham Holdings Company Master Trust	$ 85,447,958	$ 75,706,100
Total investments	85,447,958	75,706,100
Receivables
Contributions receivable from participants	123,857	142,551
Contributions receivable from employer	1,293	1,923
Notes receivable from participants	1,148,098	761,725
Total receivables	1,273,248	906,199
Net assets available for benefits	$ 86,721,206	$ 76,612,299

Description of Plan	12 Months Ended
Description of Plan	Dec. 31, 2025
EBP025 [Member]
Description of Plan [Line Items]
Description of Plan [Text Block]	DESCRIPTION OF PLAN The following description of The 401(k) Savings Plan for GHC Affiliates (the Plan) provides only general information. Participants should refer to the Plan document and Summary Plan Description (SPD) for a more comprehensive description of the Plan’s provisions. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (ERISA). General The Plan is a defined contribution plan that permits eligible employees of Kaplan, Inc. and its subsidiaries and Clyde’s Restaurant Group (Clyde’s) (collectively, the Company) to participate upon hire. The Company is a subsidiary of the Plan Sponsor, Graham Holdings Company (GHC). Eligible employees must affirmatively elect to participate in the Plan. The Plan was amended and restated effective January 1, 2024 to incorporate the amendments detailed below. The Plan is administered by the GHC Savings Plan Committee, or the Plan Administrator, whose members are appointed by the Plan Sponsor. Vanguard Fiduciary Trust Company, or VFTC, serves as the Plan’s trustee and recordkeeper. Effective January 1, 2021, the Plan entered into a Master Trust Agreement with VFTC to establish the Graham Holdings Company Master Trust, or the Master Trust. During 2025 and 2024, the Plan Administrator adopted amendments to the Plan, which are not expected to affect the Plan’s qualified status under ERISA. A number of these amendments became effective in 2024. The Plan was restated in 2024, and the Summary Plan Description was amended effective January 1, 2025, July 1, 2025, and January 1, 2026. Effective January 1, 2025, the Plan was amended to implement the following changes: •Updated for 2025 regulatory limits, changes to the Plan’s one eligibility year of service affecting highly compensated employees, designating short-term disability pay as eligible compensation in certain situations, and how account balances between $1,000 and $7,000 and greater than $7,000 can be automatically distributed; and •Allow certain small account balances of terminated participants to be automatically rolled over into an IRA with a third-party vendor, Portability Services Network ("PSN"). Participants have the option to opt out of this auto-portability service. Effective January 1, 2024, the Plan was amended to implement the following changes: •Only employees of Clyde’s who are designated as hourly employees and Kaplan, Inc. who are designated as part-time employees and certain collectively bargained union employees are eligible to receive Company Matching Contributions (generally 1% of base salary) if they are not eligible to participate in The Retirement Plan for Graham Holdings Company; •Add Roth and Roth catch-up employee contributions as an option to the Plan, and allow rollover contributions to the Plan in the form of Roth contributions; •Allow participants to elect an In-Plan Roth conversion with respect to all or a portion of the vested amounts in the participant’s accounts other than a Roth Contribution Account or a Roth Rollover Account; •Permit participants to take out one active loan from the Plan at a time; •Additionally, the Plan has a feature wherein participants can elect to have pre-tax deferrals automatically increase at increments of 1%, 2%, or 3% on an annual basis up to the limits established by the Plan. Certain restrictions apply and participants always have the right to opt out or to elect a different rate of increase; and •Participants can allocate up to 20% of certain contributions into the Graham Holdings Company Stock Fund, in accordance with the Plan’s provisions. Contributions Each year, participants may contribute a percentage of pre-tax and Roth annual eligible compensation to the Plan at rates specified in the Plan. The total pre-tax and Roth combined contributions, however, is subject to dollar limitations set forth by the Internal Revenue Code ($23,500 in 2025). Participants age 50 or older by the end of the plan year, may make additional pre-tax or Roth 401(k) contributions (of up to $7,500 in 2025) that are called “catch-up” contributions. Participants may also contribute a percentage of after-tax annual eligible compensation to the Plan at rates established by the Plan Administrator. Eligible participants in the Plan receive Company Matching Contributions equal to 100% of their pre-tax and after-tax contributions up to 1% of their base salary, which does not apply to employees covered under a collectively bargained union or employees of Clyde’s. Union employees may be eligible for a Matching Contribution up to 3% of their base salary depending on their position and length of service. Clyde’s may make a discretionary Company Matching Contribution for its participating employees equal to a percentage (to be determined at the discretion of Clyde’s) of the employees’ pre-tax or Roth contributions not in excess of a percentage (to be determined at the discretion of Clyde’s) of the employee’s compensation. The parameters of this discretionary Company Matching Contribution, and whether it will be made, will be communicated to participants on an annual basis. Additionally, the Company may at its discretion contribute a supplemental contribution to the Plan. No such discretionary or supplemental contributions were made in 2025. Contributions to the Berkshire Hathaway Stock Fund may not exceed 25% of a participant’s own contributions or 25% of the employer contributions to a participant’s account. Exchanges into the Berkshire Hathaway Stock Fund from any other fund(s) may be made only if the resulting investment in the Berkshire Hathaway Stock Fund immediately following the exchange is no more than 25% of the participant’s total account balance. All investments are participant-directed. If no investment direction is provided, a participant’s contributions will be invested in a Vanguard Target Date Retirement Fund with the target date closest to the year in which the participant reaches age 65. This serves as the Plan’s Qualified Default Investment Alternative (“QDIA”). Participant Accounts Each participant’s account is credited with his/her contributions, the Company contributions, if any, and an allocation of the investment income (losses) and administrative expenses. Allocations are based on participant earnings, account balances, or specific participant transactions, as defined. Notes Receivable from Participants Effective 2024, active participants in the Plan are eligible for one active loan at a time from the Plan. Interest rates on loans are based on the prime rate as received by Vanguard from Reuters. Reuters calculates their prime rate through a formula, which includes the average lending rates of the top 30 banks in the United States. General purpose loans have a maximum term of 5 years and principal residence loans have a maximum term of 10 years. A participant may borrow as much as 50% of his or her vested account balance, subject to certain minimum and maximum limitations as defined in the Plan. The minimum loan amount is $1,000 with a maximum of $50,000. Loan processing fees are paid by the participant. As a result of a plan merger or rollovers received, there may be additional participant loans transferred to the Plan and administered in accordance with their terms. Vesting Upon enrollment in the Plan, participants are fully vested at all times in all amounts held in their accounts. Transfers (to) from other GHC plans From time to time, participant accounts are reviewed and transferred into the Company plan that the participant is currently participating in. Additionally, transfers may also occur between the Plan and other GHC plans that relate to new organizational positions, rehired employees by one of the employers with an existing balance in another GHC plan, or transferred employees to one of the employers with an existing balance in another GHC plan. Plan Expenses Certain costs of administering the Plan are generally paid by the Company and are therefore not reflected in the Plan’s financial statements. Any expenses that are not paid by the Company are paid by the Plan itself. The Plan charges certain expenses directly to each of the participants’ accounts such as recordkeeping and maintenance of the website and phone services to participants. Each of the investment funds incurs investment and administrative expenses that are paid by the fund itself, which reduce the net investment return to participants. Payment of Benefits Participants may withdraw their vested account balance in accordance with the Plan document, which provides different rules for hardships, disability and withdrawals based on whether or not the participant has reached age 59 1/2. Upon termination of employment with the Company (including termination due to death, disability, or retirement), participants may receive a lump-sum payment of their entire account balance, net of any outstanding loan balances. Otherwise, distributions generally begin on a participant's required beginning date, which is set by Federal law, and not by the Company. Participants may roll over account balances to individual retirement accounts or another employer’s qualified retirement plan. If a terminated participant with an account balance dies prior to receiving the full value of the account, the account balance will be paid to the participant’s beneficiary or in the absence of an election pursuant to the Plan’s provisions. Account balances of $7,000 (in 2025) or less may not be deferred and are subject to automatic rollover/automatic cash out. Plan Termination Although it has not expressed any intent to do so, the Company has the right under the Plan to terminate the Plan at any time by action of the Plan Sponsor and Board of Directors subject to the provisions of ERISA. In the event the Plan terminates, participants would receive the full value of their accounts from the Plan.

Master Trust (Tables)

12 Months Ended

Dec. 31, 2025

EBP025 [Member]

Master Trust [Line Items]

Master Trust [Table Text Block]

The following table presents the net assets of the Master Trust:


	As of December 31, 2025				As of December 31, 2024
	Master Trust		Plan Interest in Master Trust		Master Trust		Plan Interest in Master Trust
Registered Investment Companies (Mutual Funds)	$	621,551,801	$	41,755,118	$	569,373,225	$	37,835,310
Common/Collective Trusts	389,436,814		40,874,521		345,424,320		35,403,793
Berkshire Hathaway Stock Fund	56,895,914		2,660,377		55,306,537		2,344,400
Graham Holdings Company Stock Fund	5,243,851		157,942		4,321,924		122,597
Total net assets	$	1,073,128,380	$	85,447,958	$	974,426,006	$	75,706,100

The following table presents the net appreciation in the fair value of investments and investment income for the Master Trust for the year ended December 31, 2025:



Net appreciation in fair value of investments	$	128,409,130
Interest and dividends	26,076,585
Total investment income	$	154,485,715

- 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
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
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+ Details

- Definition

Tabular disclosure of master trust arrangement in which employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) participates.

+ References + Details

Reconciliation of Financial Statements to Form 5500 (Net Assets) (Details) - EBP025 [Member] - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Reconciliation of Financial Statements to Form 5500 [Line Items]
Net assets available for benefits, per the financial statements	$ 86,721,206	$ 76,612,299
Participant loans reported as deemed distributions	(46,090)	(39,498)
Net assets available for benefits, per Form 5500	$ 86,675,116	$ 76,572,801

- Definition

Amount of asset less liability available to pay benefit of participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, aggregation of participants' individual account balances.

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+ Details

Statement of Changes in Net Asset Available for Benefit (Statement) - EBP025 [Member]	12 Months Ended
	Dec. 31, 2025 USD ($)
Additions to net assets:
Plan interest in investment income of the Graham Holdings Company Master Trust	$ 12,491,628
Contributions
Participant	3,873,216
Employer	52,374
Rollovers	250,187
Total contributions	4,175,777
Interest income - notes receivable	73,130
Total additions	16,740,535
Deductions from net assets:
Benefits paid to participants	(7,110,123)
Administrative expenses	(128,294)
Total deductions	(7,238,417)
Net increase	9,502,118
Transfers (to) from affiliated plans
Net transfers from other affiliated plans	606,789
Net asset available for benefits, beginning of year	76,612,299
Net asset available for benefits, end of year	86,721,206
Kaplan Tax Deferred Savings Plan [Member]
Transfers (to) from affiliated plans
Transfers from affiliated plans	1,813,308
Transfers to affiliated plans	(1,187,240)
Savings Plan for Graham Holdings Company [Member]
Transfers (to) from affiliated plans
Transfers to affiliated plans	$ (19,279)

Master Trust (Net Assets) (Details) - EBP025 [Member] - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Master Trust [Line Items]
Investment, Fair Value	$ 85,447,958	$ 75,706,100
Total net assets	86,721,206	76,612,299
Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	1,073,128,380	974,426,006
Total net assets	1,073,128,380	974,426,006
Master Trust [Member] \| Mutual Fund [Member]
Master Trust [Line Items]
Investment, Fair Value	621,551,801	569,373,225
Master Trust [Member] \| Common Collective Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	389,436,814	345,424,320
Master Trust [Member] \| Berkshire Hathaway Stock Fund [Member]
Master Trust [Line Items]
Investment, Fair Value	56,895,914	55,306,537
Master Trust [Member] \| Employer Common Stock Fund [Member]
Master Trust [Line Items]
Investment, Fair Value	5,243,851	4,321,924
Plan Interest in Master Trust [Member]
Master Trust [Line Items]
Total net assets	85,447,958	75,706,100
Plan Interest in Master Trust [Member] \| Mutual Fund [Member]
Master Trust [Line Items]
Investment, Fair Value	41,755,118	37,835,310
Plan Interest in Master Trust [Member] \| Common Collective Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	40,874,521	35,403,793
Plan Interest in Master Trust [Member] \| Berkshire Hathaway Stock Fund [Member]
Master Trust [Line Items]
Investment, Fair Value	2,660,377	2,344,400
Plan Interest in Master Trust [Member] \| Employer Common Stock Fund [Member]
Master Trust [Line Items]
Investment, Fair Value	$ 157,942	$ 122,597

Summary of Accounting Policy	12 Months Ended
Summary of Accounting Policy	Dec. 31, 2025
EBP025 [Member]
Accounting Policy [Line Items]
Summary of Accounting Policy [Text Block]	NOTE 2 – SUMMARY OF ACCOUNTING POLICIES The following accounting policies, which conform with generally accepted accounting principles in the United States of America (GAAP), have been used consistently in the preparation of the Plan’s financial statements: Basis of Accounting The financial statements of the Plan are prepared using the accrual basis of accounting. Use of Estimates The preparation of financial statements, in conformity with GAAP, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein and disclosure of contingent assets and liabilities. Actual results could differ from those estimates. Investment Valuation and Income Recognition The Plan is a participant in the Master Trust as described in Note 5. Investments held in the Master Trust are stated at fair value and are allocated to the Plan specifically in relation to the fair value of the assets assigned to the Plan. 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. The Committee determines the Master Trust’s valuation policies utilizing information provided by the trustee. See Note 6 for discussion of fair value measurements. Purchases and sales of investments in the Master Trust are recorded on a trade-date basis. Interest income is accrued when earned. Dividend income is recorded on the ex-dividend date. Capital gain distributions are included in dividend income. The Master Trust’s net appreciation includes the Master Trust’s gains and losses on investments bought and sold as well as held during the year. See Note 5 for the Plan’s interest in the Master Trust, as well as the Master Trust’s investment income. Contributions Contributions from Plan participants and the Company Matching Contributions, if applicable, are recorded in the year in which the employee’s contributions are withheld from compensation. Payment of Benefits Benefit payments to participants are recorded upon distribution. Risks and Uncertainties The Plan provides for various investment securities as investment options. Investment securities are exposed to various risks, such as interest, market, and credit risks. Market risks include global events which could impact the value of investment securities, such as a pandemic, international conflict, trade wars and tariffs. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect participant’s account balances and the amounts reported in the Statements of Net Assets Available for Benefits. Recent Accounting Pronouncements All applicable pronouncements have been adopted by the Plan. There are no issued pronouncements that will require adoption in future periods. Subsequent Events The Plan has evaluated subsequent events from December 31, 2025

Fair Value Measurements (Common Collective Trusts) (Details) - EBP025 [Member] - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Master Trust [Line Items]
Investment, Fair Value	$ 85,447,958	$ 75,706,100
Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	1,073,128,380	974,426,006
Common Collective Trust [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	389,436,814	345,424,320
Fair Value Measured at Net Asset Value Per Share [Member] \| Common Collective Trust [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	389,436,813	345,424,320
Fair Value Measured at Net Asset Value Per Share [Member] \| Target Date Strategy Funds [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	381,561,598	338,587,009
NAV, Unfunded Commitment	0
Fair Value Measured at Net Asset Value Per Share [Member] \| Target Income Strategy Fund [Member] \| Master Trust [Member]
Master Trust [Line Items]
Investment, Fair Value	7,875,215	$ 6,837,311
NAV, Unfunded Commitment	$ 0

- Definition

Fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- 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.

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+ Details

Related-Party and Party-in-Interest Transactions (Details) - EBP025 [Member]	12 Months Ended
	Dec. 31, 2025 USD ($)
Related Party and Party-in-Interest Transactions [Line Items]
Administration cost absorbed by employer [true false]	true
Employer Common Stock Fund [Member] \| Master Trust [Member]
Related Party and Party-in-Interest Transactions [Line Items]
Purchases	$ 210,457
Sales	$ 385,601

Cover	12 Months Ended
Cover	Dec. 31, 2025
Document Information [Line Items]
Document Type	11-K
Document Period End Date	Dec. 31, 2025
Entity Registrant Name	Graham Holdings Co
Amendment Flag	false
Entity Central Index Key	0000104889
EBP025 [Member]
Document Information [Line Items]
Document Type	11-K
Document Period End Date	Dec. 31, 2025
Entity Registrant Name	Graham Holdings Co
Amendment Flag	false
Entity Central Index Key	0000104889

Tax Status	12 Months Ended
Tax Status	Dec. 31, 2025
EBP025 [Member]
Tax Status [Line Items]
Tax Status [Text Block]	NOTE 4 – TAX STATUS On September 29, 2016, the Internal Revenue Service made a favorable determination that the Plan, as then designed, was qualified under IRC Section 401(a). Such determination letter did not involve a review of the effect on the Plan of certain amendments subsequently adopted. Plan management engaged the Plan’s ERISA counsel to examine the plan document and amendments, and ERISA counsel concluded that none of the amendments had an adverse effect on the tax-qualified status of the Plan under Section 401(a), including the 2016 and 2024 restatements. The Master Trust, created in 2021 has not filed for a favorable determination since the Internal Revenue Service no longer supports determination letter filings. The Master Trust is designed to be tax-exempt under IRC Section 501(a). The Plan Administrator and the Plan’s ERISA counsel believe that the Plan and Master Trust are designed and operated in compliance with the applicable requirements of the Internal Revenue Code. 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 federal, state and/or local taxing authorities. The plan administrator has analyzed the tax positions by the Plan, and has concluded that as of December 31, 2025 and 2024, there are no uncertain positions taken or expected to be taken that would require recognition of a liability (or asset) or disclosure in the financial statements. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress. The Plan administrator believes it is no longer subject to income tax examinations for the years prior to 2021.

Related-Party and Party-in-Interest Transactions	12 Months Ended
Related-Party and Party-in-Interest Transactions	Dec. 31, 2025
EBP025 [Member]
Related Party and Party-in-Interest Transactions [Line Items]
Related Party and Party-in-Interest Transactions [Text Block]	NOTE 3 – RELATED-PARTY AND PART-IN-INTEREST TRANSACTIONS Shares of registered investment companies (mutual funds) and common collective trusts are managed by The Vanguard Group, Inc. Due to the relationship between VFTC as Trustee of the Master Trust and the Plan investment transactions managed by The Vanguard Group, Inc. qualify as party-in-interest transactions. Investments in the Vanguard registered investment companies and common collective trusts are exempt from the prohibited transaction rules of ERISA pursuant to a class exemption issued by the U.S. Department of Labor. In addition, the fees associated with the management of these investments by The Vanguard Group, Inc. are included in the Master Trust’s net appreciation (depreciation) in fair value of investments. The Plan invests in shares of the Company through the Graham Holdings Company Stock Fund in the Master Trust; therefore, these transactions qualify as party-in-interest transactions. Purchases and sales of Graham Holdings stock within the Graham Holdings Stock Fund in the Master Trust for the period ended December 31, 2025, were $210,457 and $385,601, respectively. Additionally, personnel and facilities of the Company have been used to perform administrative functions for the Plan at no cost to the Plan.

Reconciliation of Financial Statements to Form 5500 (Deemed Distributions) (Details) - EBP025 [Member]	12 Months Ended
	Dec. 31, 2025 USD ($)
Reconciliation of Financial Statements to Form 5500 [Line Items]
Certain deemed distributions of participant loans per the financial statements	$ 0
Add: Loans deemed distributed current year	46,090
Deduct: Loans deemed distributed prior year	(39,498)
Certain deemed distributions of participant loans per the Form 5500	$ 6,592