0001628280-26-045274 | 11-K | XBRL Viewer

Income Tax Status	12 Months Ended
Dec. 31, 2025
EBP 055
EBP, Tax Status [Line Items]
Income Tax Status	5. Income Tax Status The Internal Revenue Service (IRS) has determined and informed the Corporation by letter dated October 23, 2013, that the Plan is designed in accordance with applicable sections of the Internal Revenue Code (IRC) and, therefore, the related trust is exempt from taxation. Under current IRS determination letter procedures, there is no opportunity for the Plan to obtain a more recent letter from the IRS. The Plan has been amended since issuance of the determination letter. However, the Plan Administrator and the Corporation’s counsel believe that the current design and operations of the Plan are in compliance with the applicable provisions of the IRC. GAAP requires management to evaluate tax positions taken by the Plan to determine whether the Plan has taken any uncertain positions that more likely than not would not be sustained upon examination by the IRS. The Plan Administrator has analyzed the tax positions taken by the Plan, and has concluded that as of December 31, 2025, there were 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, but no tax audits are in progress. The Plan Administrator believes the Plan is no longer subject to income tax examinations for years prior to 2022.

Description of the Plan (Details)	12 Months Ended
Description of the Plan (Details)	Dec. 31, 2025 USD ($)
EBP 018
EBP, Description of Plan [Line Items]
Transfers into the plan	$ 35,900,000
EBP 019
EBP, Description of Plan [Line Items]
Transfers into the plan	3,500,000
EBP 020
EBP, Description of Plan [Line Items]
Transfers into the plan	4,100,000
EBP 021
EBP, Description of Plan [Line Items]
Transfers into the plan	2,700,000
EBP 055
EBP, Description of Plan [Line Items]
Transfers into the plan	$ 46,176,000
Maximum annual compensation to total compensation, percentage	40.00%
Automatic deferral rate	3.00%
Automatic deferral rate, annual increase	1.00%
Initial transfer	$ 500
Subsequent transfers	500
Minimum borrowing, amount	$ 500
Maximum borrowing, to total account, percentage	50.00%
Maximum borrowing, amount	$ 50,000
Time period for loans used to reduce maximum borrowing amount	12 months
Basis spread on variable rate	1.00%
EBP 055 \| Minimum
EBP, Description of Plan [Line Items]
Matching percentage	0.00%
EBP 055 \| Maximum
EBP, Description of Plan [Line Items]
Automatic deferral rate	8.00%
Matching percentage	8.00%

Master Trust - Narrative (Details) - EBP 055 $ in Thousands	12 Months Ended
Master Trust - Narrative (Details) - EBP 055 $ in Thousands	Dec. 31, 2025 USD ($) d	Dec. 31, 2024 USD ($)
EBP, Investment, Fair Value and NAV [Line Items]
Maximum borrowing capacity	$ 200,000
Prepayment period \| d	3
Interest in net investment gain from participation in Lockheed Martin Corporation Defined Contribution Plans Master Trust	$ 398,986
Investments at fair value	3,051,475	$ 2,651,359
Master Trust Balance
EBP, Investment, Fair Value and NAV [Line Items]
Interest and dividends	764,000
Interest in net investment gain from participation in Lockheed Martin Corporation Defined Contribution Plans Master Trust	6,100,000
Level 1 \| Common stocks - Lockheed Martin
EBP, Investment, Fair Value and NAV [Line Items]
Investments at fair value	$ 18,200	$ 16,700

Master Trust - Master Trust By Asset Category and Fair Value Hierarchy (Details) - EBP 055 - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EBP, Master Trust [Line Items]
Total net assets available for benefits	$ 3,407,757	$ 2,986,853
Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	55,496,381	50,978,328
Receivables, net	25,344	15,392
Fully benefit-responsive investment contracts at contract value	4,887,387	4,991,458
Total net assets available for benefits	60,409,112	55,985,178
Cash and cash equivalents and short-term investment fund \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	675,098	724,303
Common and preferred stocks \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	8,447,158	6,934,489
Common stocks - Lockheed Martin \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	11,373,758	12,097,506
Common/collective trusts \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	28,919,660	26,108,226
Registered investment companies (mutual funds) \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	1,012,735	718,567
Corporate debt securities \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	867,174	755,451
U.S. Government securities \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	662,609	667,026
Other investments \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	148,008	130,680
Self-directed brokerage account \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	3,390,181	2,842,080
Level 1 \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	24,052,295	22,460,872
Level 1 \| Cash and cash equivalents and short-term investment fund \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	18,383	36,089
Level 1 \| Common and preferred stocks \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	8,437,126	6,926,943
Level 1 \| Common stocks - Lockheed Martin \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	11,373,758	12,097,506
Level 1 \| Common/collective trusts \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	0	0
Level 1 \| Registered investment companies (mutual funds) \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	832,847	558,254
Level 1 \| Corporate debt securities \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	0	0
Level 1 \| U.S. Government securities \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	0	0
Level 1 \| Other investments \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	0	0
Level 1 \| Self-directed brokerage account \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	3,390,181	2,842,080
Level 2 \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	31,444,086	28,517,456
Level 2 \| Cash and cash equivalents and short-term investment fund \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	656,715	688,214
Level 2 \| Common and preferred stocks \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	10,032	7,546
Level 2 \| Common stocks - Lockheed Martin \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	0	0
Level 2 \| Common/collective trusts \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	28,919,660	26,108,226
Level 2 \| Registered investment companies (mutual funds) \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	179,888	160,313
Level 2 \| Corporate debt securities \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	867,174	755,451
Level 2 \| U.S. Government securities \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	662,609	667,026
Level 2 \| Other investments \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	148,008	130,680
Level 2 \| Self-directed brokerage account \| Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	$ 0	$ 0

Reconciliation of Financial Statements to Form 5500 - Reconciliation of Net Assets Available for Benefit (Details) - EBP 055 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Reconciliation of Financial Statement to Form 5500 [Line Items]
Amounts per Financial Statements	$ 398,986
Difference	(205)
Amounts per Form 5500	398,781
Amounts per Financial Statements	4,282
Difference	4,282
Amounts per Form 5500	0
Amounts per Financial Statements	4,825
Difference	(4,487)
Amounts per Form 5500	$ 338	$ 338

Form 5500, Schedule H, Line 4i – Schedule of Assets (Held at End of Year) (Details) - EBP 055 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Schedule of Asset Held for Investment [Line Items]
Entity tax identification number	52-1893632
Plan number	055
Cost	$ 0
Current Value	$ 57,927	$ 48,231
Minimum
EBP, Schedule of Asset Held for Investment [Line Items]
Notes receivable from participants, interest rate	4.25%
Maximum
EBP, Schedule of Asset Held for Investment [Line Items]
Notes receivable from participants, interest rate	10.50%

- Definition

Plan number of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), in three-digit numeric format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)
-Publisher DOL-EBSA

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+ Details

Master Trust (Tables)

12 Months Ended

Dec. 31, 2025

EBP 055

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

EBP, Master Trust

The following table presents the Plan’s interest in the Master Trust balance as of December 31, 2025 and 2024 (in thousands):


	December 31, 2025				December 31, 2024
	Master Trust Balance		Plan’s Interest in Master Trust Balance		Master Trust Balance		Plan’s Interest in Master Trust Balance

Cash and cash equivalents and short-term investment fund	$	675,098	$	42,536	$	724,303	$	43,804
Common and preferred stocks	8,447,158		551,797		6,934,489		436,933
Common stocks - Lockheed Martin	11,373,758		442,939		12,097,506		458,545
Common/collective trusts (a)	28,919,660		1,694,586		26,108,226		1,465,903
Registered investment companies (mutual funds)	1,012,735		57,532		718,567		37,102
Corporate debt securities	867,174		49,175		755,451		40,177
U.S. Government securities	662,609		38,475		667,026		36,102
Other investments (b)	148,008		8,358		130,680		6,953
Self-directed brokerage account	3,390,181		150,688		2,842,080		129,269
Total investments at fair value (c)(d)	55,496,381		3,036,086		50,978,328		2,654,788

Fully benefit-responsive investment contracts at contract value	4,887,387		298,693		4,991,458		287,601

Plus:
Due from broker for securities sold	23,298		1,287		5,003		263
Accrued interest and dividends	55,418		3,061		39,222		2,062
Other receivables (e)	44,842		2,477		67,276		3,537
Less:
Due to broker for securities purchased	(47,874)		(2,644)		(19,006)		(999)
Accrued expenses	(50,044)		(2,764)		(77,077)		(4,052)
Other payables (e)	(296)		(17)		(26)		(1)
Total net assets (d)	$	60,409,112	$	3,336,179	$	55,985,178	$	2,943,199

(a)Includes 103-12 investment entities.

(b)Includes auto loans, bank loans, collateralized mortgage obligations, government agencies and credit card loans.

(c)The Plan’s reported total investments at fair value as of December 31, 2025 and 2024 has a variance of $(15.4) million and $3.4 million, respectively, to the reported Interest in Lockheed Martin Corporation Defined Contribution Plans Master Trust of Investments at fair value on the Statements of Net Assets Available for Benefits (see page 3). These amounts are the net result between certain accruals recorded by either the Master Trust or the Plan separately at year-end.

(d)The total investments at fair value and total net assets on the Master Trust’s balance included $1.7 million and $1.5 million of the Allcomp Inc. 401(k) Profit Sharing Plan balance as of December 31, 2025 and 2024, respectively. Effective April 19, 2022, this Plan became a participating plan in the Master Trust. Since the Plan has less than 100 participants, an audit is not required and accordingly financial statements were not prepared.

(e)Includes unsettled trades, other receivables/payables, market values on foreign currency, other cash positions on futures.

The following table presents the fair value of the assets in the Master Trust by asset category and their level within the fair value hierarchy as of December 31, 2025 (in thousands):


	Level 1		Level 2		Total
Cash and cash equivalents and short-term investment fund	$	18,383	$	656,715	$	675,098
Common and preferred stocks	8,437,126		10,032		8,447,158
Common stocks - Lockheed Martin	11,373,758		—		11,373,758
Common/collective trusts (a)	—		28,919,660		28,919,660
Registered investment companies (mutual funds)	832,847		179,888		1,012,735
Corporate debt securities	—		867,174		867,174
U.S. Government securities	—		662,609		662,609
Other investments (b)	—		148,008		148,008
Self-directed brokerage account	3,390,181		—		3,390,181
Total investment assets at fair value	$	24,052,295	$	31,444,086	$	55,496,381
Receivables, net					25,344
Fully benefit-responsive investment contracts at contract value					4,887,387
Total net assets					$	60,409,112

The following table presents the fair value of the assets in the Master Trust by asset category and their level within the fair value hierarchy as of December 31, 2024 (in thousands):


	Level 1		Level 2		Total
Cash and cash equivalents and short-term investment fund	$	36,089	$	688,214	$	724,303
Common and preferred stocks	6,926,943		7,546		6,934,489
Common stocks - Lockheed Martin	12,097,506		—		12,097,506
Common/collective trusts (a)	—		26,108,226		26,108,226
Registered investment companies (mutual funds)	558,254		160,313		718,567
Corporate debt securities	—		755,451		755,451
U.S. Government securities	—		667,026		667,026
Other investments (b)	—		130,680		130,680
Self-directed brokerage account	2,842,080		—		2,842,080
Total investment assets at fair value	$	22,460,872	$	28,517,456	$	50,978,328
Receivables, net					15,392
Fully benefit-responsive investment contracts at contract value					4,991,458
Total net assets					$	55,985,178

(a)Includes 103-12 investment entities.

(b)Includes auto loans, bank loans, collateralized mortgage obligations, government agencies and credit card loans.

- 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

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

+ References + Details

Statements of Net Assets Available for Benefits - EBP 055 - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Interest in Lockheed Martin Corporation Defined Contribution Plans Master Trust:
Investments at fair value	$ 3,051,475	$ 2,651,359
Investments in fully benefit-responsive investment contracts at contract value	298,693	287,601
Receivables:
Notes receivable from participants	57,927	48,231
Total assets	3,408,095	2,987,191
Liabilities
Administrative expenses payable	338	338
Total net assets available for benefits	$ 3,407,757	$ 2,986,853

Description of the Plan	12 Months Ended
Description of the Plan	Dec. 31, 2025
EBP 055
EBP, Description of Plan [Line Items]
Description of the Plan	1. Description of the Plan The following description of the Lockheed Martin Corporation Performance Sharing Plan for Bargaining Employees (the Plan) provides only general information about the Plan’s provisions. Participants should refer to the Plan document and Summary Plan Description for a more complete description of the Plan’s provisions. General The Plan is a defined contribution plan covering permanent full-time employees and certain permanent part-time employees under collective bargaining agreements of eligible business units of Lockheed Martin Corporation (Lockheed Martin or the Corporation). Employees are eligible to enroll in the Plan after completion of the waiting period in their collective bargaining agreement. Certain nonunion employees, as designated by Lockheed Martin, may participate in the Plan. The Plan includes an Employee Stock Ownership Plan (ESOP) feature. Cash dividends paid on Lockheed Martin common stock in both the ESOP Fund and the Lockheed Martin Stock Fund are automatically reinvested in those funds, unless the participant elects to receive the dividend directly as taxable income. The assets of the Plan, excluding receivables, are held and invested on a commingled basis in the Lockheed Martin Corporation Defined Contribution Plans Master Trust (the Master Trust) under an agreement between Lockheed Martin and State Street Bank and Trust Company (the Trustee). The record keeper is Empower. Lockheed Martin is the Plan Sponsor and the Plan Administrator. Certain represented employees who were participating in the Lockheed Martin Corporation Hourly Savings Plan Plus (HSP), the Lockheed Martin Corporation Capital Accumulation Plan (CAP), the Lockheed Martin Corporation Capital Accumulation Plan for Hourly Employees (HCAP), and the Lockheed Martin Corporation Basic Benefit Plan for Hourly Employees (BBP) became eligible to participate in the Plan and ineligible to participate in HSP, CAP, HCAP, and BBP. Most of these employees had their account balances transferred from HSP, CAP, HCAP, and BBP to the Plan. Account balances of those employees with more than one outstanding loan from any plan sponsored by the Corporation or a qualified domestic relations order (QDRO) hold under HSP, CAP, HCAP, or BBP were not immediately transferred; however, these account balances are subject to transfer to the Plan when the loans are repaid or the QDROs are resolved. During 2025, assets of the HSP, CAP, HCAP, and BBP in the amount of $35.9 million, $3.5 million, $4.1 million and $2.7 million, respectively, were transferred to the Plan. Contributions Collective bargaining agreements determine whether participants can make contributions based on percentage of base wages, whether a participant is automatically enrolled in the Plan, and whether participants are eligible for employer contributions and employer matching contributions. Contributions may be made on a before-tax, after-tax, or Roth 401(k) basis. Eligible employees can contribute up to 40% of the employees' base wages, subject to regulatory limitations. If automatically enrolled, a participant’s contribution is set at 3% of eligible compensation in before-tax contributions. Certain unions in the Plan have an auto-escalation feature whereby contributions for those automatically enrolled are increased 1% each year up to 8% unless changed by the participant. Contributions are limited to amounts determined in collective bargaining agreements. In general, participant contributions eligible for an employer matching contribution range from 0% to 8% of base pay. Certain union participants receive the company contributions in a certain percentage of the employees' base wages. Participants may also elect to make additional contributions that are not considered for purposes of the employer match. The Plan permits catch-up contributions for participants turning age 50 or older by the end of the calendar year. Catch-up contributions are not eligible for Company matching contributions. Pursuant to the applicable collective bargaining agreements, certain participants may contribute additional sources of income to the Plan, such as ratification bonuses, a cost of living adjustment payment or lump sum wage supplement payment. Participants are immediately vested in all employer contributions. Contributions may be invested in one or more of the available investment funds at the participant’s election. Participants may change the investment mix of their account balance up to 6 times per calendar quarter. Participants may make an unlimited number of transfers out of the Lockheed Martin Stock Fund or the ESOP Fund. An option available to participants is the self-directed brokerage account (SDBA), whereby a participant may elect to invest the participant’s transferable account balance in stocks, mutual funds, bonds, or other investments of the participant’s choosing. A participant’s initial transfer to the SDBA must be at least $500, and subsequent transfers must be at least $500. No distributions, withdrawals, or loans may be made directly from the assets in the SDBA, unless the participant requests a lump sum distribution after termination of employment. Participant Accounts Each participant’s account is credited with the participant’s contributions, the employer’s matching and non-elective contributions, as applicable, and the respective investment earnings or losses, less expenses, of the individual funds in which the account is invested. Notes Receivable from Participants Participants may borrow from their total account balance a minimum of $500 and up to a maximum amount equal to the lesser of 50% of their account balance or $50,000 (minus their highest outstanding loan balance from the past 12 months, if any). The loans are secured by the balance in the participant’s account and bear interest of 1% over a published prime rate. Principal and interest are paid ratably through weekly payroll deductions. Notes receivable from participants are measured at their unpaid principal balance plus any accrued but unpaid interest. Payment of Benefits On termination of service due to death, disability or retirement, a participant or beneficiary may elect to receive his or her account balance through a number of payout options. A participant is entitled to the account balance at the time his or her employment with the Corporation ends. Plan Termination Although it has not expressed any intent to do so, the Board of Directors of Lockheed Martin has the right to amend, suspend or terminate the Plan at any time, subject to the provisions of the Employee Retirement Income Security Act of 1974 (ERISA). In the event of Plan termination, participants will receive a payment equal to the total value of their accounts.

Master Trust - Master Trust Balance (Details) - EBP 055 - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EBP, Master Trust [Line Items]
Accrued expenses	$ (338)	$ (338)
Total net assets available for benefits	3,407,757	2,986,853
Accrual variance	(15,400)	3,400
Participant- Directed Investments
EBP, Master Trust [Line Items]
Total Investments at fair value	1,700	1,500
Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	55,496,381	50,978,328
Fully benefit-responsive investment contracts at contract value	4,887,387	4,991,458
Due from broker for securities sold	23,298	5,003
Accrued interest and dividends	55,418	39,222
Other receivables	44,842	67,276
Due to broker for securities purchased	(47,874)	(19,006)
Accrued expenses	(50,044)	(77,077)
Other payables	(296)	(26)
Total net assets available for benefits	60,409,112	55,985,178
Master Trust Balance \| Cash and cash equivalents and short-term investment fund
EBP, Master Trust [Line Items]
Total Investments at fair value	675,098	724,303
Master Trust Balance \| Common and preferred stocks
EBP, Master Trust [Line Items]
Total Investments at fair value	8,447,158	6,934,489
Master Trust Balance \| Common stocks - Lockheed Martin
EBP, Master Trust [Line Items]
Total Investments at fair value	11,373,758	12,097,506
Master Trust Balance \| Common/collective trusts
EBP, Master Trust [Line Items]
Total Investments at fair value	28,919,660	26,108,226
Master Trust Balance \| Registered investment companies (mutual funds)
EBP, Master Trust [Line Items]
Total Investments at fair value	1,012,735	718,567
Master Trust Balance \| Corporate debt securities
EBP, Master Trust [Line Items]
Total Investments at fair value	867,174	755,451
Master Trust Balance \| U.S. Government securities
EBP, Master Trust [Line Items]
Total Investments at fair value	662,609	667,026
Master Trust Balance \| Other investments
EBP, Master Trust [Line Items]
Total Investments at fair value	148,008	130,680
Master Trust Balance \| Self-directed brokerage account
EBP, Master Trust [Line Items]
Total Investments at fair value	3,390,181	2,842,080
Plan’s Interest in Master Trust Balance
EBP, Master Trust [Line Items]
Total Investments at fair value	3,036,086	2,654,788
Fully benefit-responsive investment contracts at contract value	298,693	287,601
Due from broker for securities sold	1,287	263
Accrued interest and dividends	3,061	2,062
Other receivables	2,477	3,537
Due to broker for securities purchased	(2,644)	(999)
Accrued expenses	(2,764)	(4,052)
Other payables	(17)	(1)
Total net assets available for benefits	3,336,179	2,943,199
Plan’s Interest in Master Trust Balance \| Cash and cash equivalents and short-term investment fund
EBP, Master Trust [Line Items]
Total Investments at fair value	42,536	43,804
Plan’s Interest in Master Trust Balance \| Common and preferred stocks
EBP, Master Trust [Line Items]
Total Investments at fair value	551,797	436,933
Plan’s Interest in Master Trust Balance \| Common stocks - Lockheed Martin
EBP, Master Trust [Line Items]
Total Investments at fair value	442,939	458,545
Plan’s Interest in Master Trust Balance \| Common/collective trusts
EBP, Master Trust [Line Items]
Total Investments at fair value	1,694,586	1,465,903
Plan’s Interest in Master Trust Balance \| Registered investment companies (mutual funds)
EBP, Master Trust [Line Items]
Total Investments at fair value	57,532	37,102
Plan’s Interest in Master Trust Balance \| Corporate debt securities
EBP, Master Trust [Line Items]
Total Investments at fair value	49,175	40,177
Plan’s Interest in Master Trust Balance \| U.S. Government securities
EBP, Master Trust [Line Items]
Total Investments at fair value	38,475	36,102
Plan’s Interest in Master Trust Balance \| Other investments
EBP, Master Trust [Line Items]
Total Investments at fair value	8,358	6,953
Plan’s Interest in Master Trust Balance \| Self-directed brokerage account
EBP, Master Trust [Line Items]
Total Investments at fair value	$ 150,688	$ 129,269

Summary of Significant Accounting Policies (Policies) - EBP 055	12 Months Ended
	Dec. 31, 2025
EBP, Accounting Policy [Line Items]
Basis of Accounting	Basis of Accounting The financial statements of the Plan are prepared on the accrual basis of accounting.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could differ from those estimates.
Payments of Benefits	Payment of Benefits Benefits are recorded when paid.
Risks and Uncertainties	Risks and Uncertainties The Plan, through the Master Trust, invests in various investment securities. Investment securities are exposed to various risks such as interest rate, market, and credit risks. 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 participants’ account balances and the amounts reported in the Statements of Net Assets Available for Benefits.
Investment Valuation and Income Recognition	Investment Valuation and Income Recognition Investments in the Master Trust are primarily reported at fair value. Fair value is the price that would have been received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fully benefit-responsive investment contracts are reported at contract value. Contract value is the relevant measurement attributable to fully benefit-responsive investment contracts because it is the amount participants would receive if they were to initiate permitted transactions under the terms of the Plan. The contract value represents contributions plus earnings, less participant withdrawals and administrative expenses. See Note 3 for discussion of fair value measurements and fully benefit-responsive investment contracts. Purchases and sales of securities in the Master Trust are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Gains and losses on investments bought and sold as well as held during the year are included in interest in net investment gains from the Master Trust on the Statement of Changes in Net Assets Available for Benefits. Interest income on notes receivable from participants is recorded on the accrual basis.
Administrative Expenses	Administrative Expenses Direct administrative expenses are paid by the Master Trust and generally allocated to the Plan proportionally based on the Plan’s interest in the Master Trust’s net assets or directly if specifically related to the Plan. Certain indirect administrative expenses are paid by the Corporation and are excluded from these financial statements. Expenses paid by the Plan are shown on the Statement of Changes in Net Assets Available for Benefits.

- 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

Master Trust

12 Months Ended

Dec. 31, 2025

EBP 055

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

Master Trust

3. Master Trust

General

The Plan’s interest in the Master Trust is stated at the value of the underlying net assets in the Master Trust. The realized and unrealized gains and losses and investment income of the Master Trust are allocated among the participating plans included therein proportionally based on each plan’s earnings, which include unrealized gains and losses, investment income and plan expenses.

The following table presents the Plan’s interest in the Master Trust balance as of December 31, 2025 and 2024 (in thousands):


	December 31, 2025				December 31, 2024
	Master Trust Balance		Plan’s Interest in Master Trust Balance		Master Trust Balance		Plan’s Interest in Master Trust Balance

Cash and cash equivalents and short-term investment fund	$	675,098	$	42,536	$	724,303	$	43,804
Common and preferred stocks	8,447,158		551,797		6,934,489		436,933
Common stocks - Lockheed Martin	11,373,758		442,939		12,097,506		458,545
Common/collective trusts (a)	28,919,660		1,694,586		26,108,226		1,465,903
Registered investment companies (mutual funds)	1,012,735		57,532		718,567		37,102
Corporate debt securities	867,174		49,175		755,451		40,177
U.S. Government securities	662,609		38,475		667,026		36,102
Other investments (b)	148,008		8,358		130,680		6,953
Self-directed brokerage account	3,390,181		150,688		2,842,080		129,269
Total investments at fair value (c)(d)	55,496,381		3,036,086		50,978,328		2,654,788

Fully benefit-responsive investment contracts at contract value	4,887,387		298,693		4,991,458		287,601

Plus:
Due from broker for securities sold	23,298		1,287		5,003		263
Accrued interest and dividends	55,418		3,061		39,222		2,062
Other receivables (e)	44,842		2,477		67,276		3,537
Less:
Due to broker for securities purchased	(47,874)		(2,644)		(19,006)		(999)
Accrued expenses	(50,044)		(2,764)		(77,077)		(4,052)
Other payables (e)	(296)		(17)		(26)		(1)
Total net assets (d)	$	60,409,112	$	3,336,179	$	55,985,178	$	2,943,199

(a)Includes 103-12 investment entities.

(b)Includes auto loans, bank loans, collateralized mortgage obligations, government agencies and credit card loans.

(e)Includes unsettled trades, other receivables/payables, market values on foreign currency, other cash positions on futures.

The Plan, through the Master Trust, invests in the Lockheed Martin Investment Management Company (LMIMCo) Stable Value Fund which holds synthetic guaranteed investment contracts (synthetic GICs) that are fully benefit-responsive and managed separate accounts. A synthetic GIC, also known as a wrap contract, is an investment contract issued by an insurance company or other financial institution paired with an underlying investment or investments, usually a portfolio of high quality fixed income securities. These investment contracts provide the realized and unrealized gains and losses on the underlying investments that are amortized over the duration of the underlying investments through adjustments to the future interest-crediting rates. The primary factors affecting the future interest-crediting rates of the wrap contracts include the level of market interest rates, the amount and timing of participant contributions, transfers, and withdrawals into or out of the wrap contracts, the investment returns generated by the investments that back the wrap contracts, and the duration of the underlying investments covered by the wrap contracts. The future interest-crediting rates may not be less than 0% and are adjusted monthly or quarterly based on the yield to maturity of the underlying investments, a market value to contract value ratio of the underlying investments, and the durations of the underlying investments. The contracts are fully benefit-responsive, which guarantees that all qualified participant withdrawals will occur at contract value.

In certain circumstances, the amount withdrawn from the investment contract would be payable at fair value rather than at contract value. These events include termination of the Plan, a material adverse change to the provisions of the Plan, a withdrawal from a wrap contract in order to switch to a different investment provider, or adoption of a successor plan that does not meet the wrap contract issuer’s underwriting criteria for issuance of a duplicate wrap contract. The Plan Administrator does not believe that the occurrence of any of these events is probable. Also, the following events would permit the contract issuers to terminate the contracts prior to their scheduled maturity date: the Plan’s loss of its qualified status, uncured material breaches of responsibilities, or material and adverse changes to the provisions of the Plan. If one of these events were to occur, the contract issuer could terminate the contract at the fair value of the underlying investments.

The Master Trust invests in a Government Short-Term Investment Fund, consisting of U.S. Treasury obligations and commercial paper, which is used as a temporary investment to hold contributions from the day the cash is transferred from the Corporation to the Trustee until the day the cash is invested in a particular fund. The related earnings from the Government Short-Term Investment Fund are used to pay certain expenses related to participant accounts.

In order to provide appropriate liquidity to meet ongoing daily cash outflow requirements for the Lockheed Martin Stock Fund, ESOP Fund, and the other investment funds that are investment alternatives for the Plan that are beneficiaries of the Master Trust, the Master Trust may be able to receive advances from the LMIMCo Stable Value Fund or the Corporation. The LMIMCo Stable Value Fund may make an advance only after considering its own liquidity needs. Any investment fund that receives an advance will compensate the LMIMCo Stable Value Fund for income lost due to any such advance by paying interest on such advance. The interest is compounded daily based on an annual rate equal to the interest crediting rate of the short-term investment portion of the LMIMCo Stable Value Fund. The Lockheed Martin Stock Fund and ESOP Fund may borrow, without interest, up to $200 million from the Corporation, as evidenced by a promissory note, which requires repayment within three business days after the advance. As of December 31, 2025 and 2024, there were no such advances payable to the Corporation. Occasionally, the Master Trust invests in derivative financial instruments for liquidity or asset allocation purposes. As of December 31, 2025 and 2024, there were no material investments in derivatives.

Fair Value of Assets

The accounting standard for fair value measurements defines fair value, establishes a market-based framework or hierarchy for measuring fair value, and requires disclosures regarding fair value measurements. The standard is applicable whenever assets and liabilities are measured and included in the financial statements at fair value.

The fair value hierarchy established in the standard prioritizes the inputs used in valuation techniques into three levels as follows:

• Level 1 – Quoted prices in active markets for identical assets and liabilities;

• Level 2 – Observable inputs, other than Level 1 prices, such as quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in inactive markets, and amounts derived from valuation models where all significant inputs are observable in active markets; and

• Level 3 – Unobservable inputs where valuation models are supported by little or no market activity that one or more significant inputs are unobservable and require us to develop relevant assumptions.

The following table presents the fair value of the assets in the Master Trust by asset category and their level within the fair value hierarchy as of December 31, 2025 (in thousands):


	Level 1		Level 2		Total
Cash and cash equivalents and short-term investment fund	$	18,383	$	656,715	$	675,098
Common and preferred stocks	8,437,126		10,032		8,447,158
Common stocks - Lockheed Martin	11,373,758		—		11,373,758
Common/collective trusts (a)	—		28,919,660		28,919,660
Registered investment companies (mutual funds)	832,847		179,888		1,012,735
Corporate debt securities	—		867,174		867,174
U.S. Government securities	—		662,609		662,609
Other investments (b)	—		148,008		148,008
Self-directed brokerage account	3,390,181		—		3,390,181
Total investment assets at fair value	$	24,052,295	$	31,444,086	$	55,496,381
Receivables, net					25,344
Fully benefit-responsive investment contracts at contract value					4,887,387
Total net assets					$	60,409,112

Interest and dividend income earned by the Master Trust for the year ended December 31, 2025 was $764.0 million. The net appreciation for the year ended December 31, 2025 was $6.1 billion.

The following table presents the fair value of the assets in the Master Trust by asset category and their level within the fair value hierarchy as of December 31, 2024 (in thousands):


	Level 1		Level 2		Total
Cash and cash equivalents and short-term investment fund	$	36,089	$	688,214	$	724,303
Common and preferred stocks	6,926,943		7,546		6,934,489
Common stocks - Lockheed Martin	12,097,506		—		12,097,506
Common/collective trusts (a)	—		26,108,226		26,108,226
Registered investment companies (mutual funds)	558,254		160,313		718,567
Corporate debt securities	—		755,451		755,451
U.S. Government securities	—		667,026		667,026
Other investments (b)	—		130,680		130,680
Self-directed brokerage account	2,842,080		—		2,842,080
Total investment assets at fair value	$	22,460,872	$	28,517,456	$	50,978,328
Receivables, net					15,392
Fully benefit-responsive investment contracts at contract value					4,991,458
Total net assets					$	55,985,178

(a)Includes 103-12 investment entities.

(b)Includes auto loans, bank loans, collateralized mortgage obligations, government agencies and credit card loans.

Valuation Techniques

Cash equivalents and short-term investment funds categorized as Level 1 are mostly comprised of short-term money-market instruments and are valued at cost, which approximates fair value. Cash equivalents and short-term investment funds categorized as Level 2 are short-term government securities consisting of U.S. Treasuries and U.S. agency issues.

Common and preferred stocks categorized as Level 1 are traded on active national and international exchanges and are valued at closing prices on the last trading day of the year. For common and preferred stocks not traded on an active exchange, or if the closing price is not available, the Trustee obtains indicative quotes from a pricing vendor, broker or investment manager. These stocks are categorized as Level 2 if the custodian obtains corroborated quotes from a pricing vendor.

Common/collective trusts (CCTs) and registered investment companies (e.g., mutual funds, exchange-traded funds (ETFs), etc.) are investment vehicles valued using the Net Asset Value (NAV) provided by the fund managers. The NAV is the total value of the fund divided by the number of shares outstanding and is based on the fair value of underlying investments held by the CCTs. CCTs are traded at NAV, determined daily or monthly. CCTs are categorized as Level 2 because the NAVs, although readily determinable, are not published on an active exchange nor publicly available. Registered investment companies are traded at NAV, determined and published daily, and are categorized as Level 1 or categorized as Level 2 if the NAVs, although readily determinable, are not published on an active exchange nor publicly available.

Corporate debt securities, U.S. Government securities and other investments categorized as Level 2 are valued by the Trustee using pricing models that use verifiable observable market data (e.g., interest rates and yield curves observable at commonly quoted intervals), bids provided by brokers or dealers, or quoted prices of securities with similar characteristics. The Trustee obtains pricing based on indicative quotes or bid evaluations from vendors, brokers or the investment manager.

SDBA investments categorized as Level 1 are primarily cash equivalents, common stock, ETFs, and mutual funds. As of December 31, 2025 and 2024, this account included Lockheed Martin common stock of $18.2 million and $16.7 million, respectively.

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 management 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.

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

+ References

+ Details

Statement of Changes in Net Assets Available for Benefits - EBP 055 $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
EBP, Statement of Change in Net Asset Available for Benefit [Line Items]
Net assets available for benefits at beginning of year	$ 2,986,853
Contributions:
Participant	170,828
Employer	96,140
Total contributions	266,968
Interest in net investment gain from participation in Lockheed Martin Corporation Defined Contribution Plans Master Trust	398,986
Interest income on notes receivable from participants	4,282
Total additions	670,236
Deductions from net assets:
Distributions and withdrawals	290,683
Administrative expenses	4,825
Total deductions	295,508
Change in net assets	374,728
Transfers into the plan	46,176
Net assets available for benefits at end of year	$ 3,407,757

Cover	12 Months Ended
Cover	Dec. 31, 2025
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	LOCKHEED MARTIN CORPORATION
Entity Central Index Key	0000936468
Amendment Flag	false
EBP 055
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	LOCKHEED MARTIN CORPORATION
Entity Central Index Key	0000936468
Amendment Flag	false

Parties-in-Interest Transactions	12 Months Ended
Parties-in-Interest Transactions	Dec. 31, 2025
EBP 055
EBP, Related Party and Party-in-Interest Transactions [Line Items]
Parties-in-Interest Transactions	4. Parties-in-Interest Transactions The Plan makes certain investments through the Master Trust, which are considered to be party-in-interest transactions for which a statutory exemption from the prohibited transaction regulation exists. The Master Trust held 23,515,534 and 24,895,062 shares of the Corporation’s common stock as of December 31, 2025 and 2024, respectively. Dividends earned by the Master Trust on the Corporation’s common stock were $322.1 million for the year ended December 31, 2025. The Master Trust engages certain divisions of State Street Corporation for different services. State Street Bank and Trust Company is engaged by the Master Trust as its trustee and to provide custodial services. State Street Global Markets, LLC provides brokerage services while State Street Global Advisors (SSgA) provides investment management and is an independent fiduciary for the Company Stock Fund and the ESOP Fund. Additionally, SSgA manages the money market portfolio of the LMIMCo Stable Value Fund and the Master Trust uses the State Street Government Short Term Investment Fund (managed by SSgA) as its sweep vehicle. The Master Trust invests in common stock from Charles Schwab Corporation, who provides the brokerage services for the SDBA investment option under the Plan. The Master Trust owed the Corporation $6.0 million and $6.3 million as of December 31, 2025 and 2024, respectively, for certain expenses paid by the Corporation in providing services to the Plan and certain other plans. In addition, notes receivable from participants are considered to be party-in-interest transactions for which a statutory exemption from the prohibited transaction regulation exists.

Parties-in-Interest Transactions (Details) - EBP 055 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
EBP, Related Party and Party-in-Interest Transactions [Line Items]
Amount owed to Corporation	$ 6.0	$ 6.3
Common stocks - Lockheed Martin
EBP, Related Party and Party-in-Interest Transactions [Line Items]
Investment, number of shares (in shares)	23,515,534	24,895,062
Dividends earned	$ 322.1