0000100885-26-000207 | 11-K | XBRL Viewer

EXEMPT PARTY-IN-INTEREST TRANSACTIONS	12 Months Ended
Dec. 31, 2025
EBP 015
EBP, Related Party and Party-in-Interest Transactions [Line Items]
EXEMPT PARTY-IN-INTEREST TRANSACTIONS	EXEMPT PARTY-IN-INTEREST TRANSACTIONS The Master Trust investments include the Union Pacific common stock fund, which is invested in the common stock of the Corporation. The Corporation is the parent holding company of the Plan sponsor and, therefore, these transactions qualify as party-in-interest transactions. At December 31, 2025 and 2024, the Plan’s interest in the Master Trust’s investment in the Union Pacific common stock fund had a cost basis of $120,746,736 and $124,184,655, respectively. During the year ended December 31, 2025, the Plan recorded dividend income of $6,749,575. The Master Trust also invests in various funds managed by VFTC and common/collective trusts managed by T Rowe Price and EARNEST Partners. VFTC is the Plan's trustee and recordkeeper, and T Rowe Price and EARNEST Partners are each a fiduciary with respect to the Plan's assets invested in the common/collective trusts they manage. Therefore, investment transactions in funds managed by these entities qualify as party-in-interest transactions.

FAIR VALUE MEASUREMENT

12 Months Ended

Dec. 31, 2025

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

Accounting Standard Codification (ASC) 820, Fair Value Measurement, established a single authoritative definition of fair value, set a framework for measuring fair value, and requires additional disclosures about fair value measurements. In accordance with ASC 820, the Plan classifies its investments into a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include:

Level 1 — Quoted market prices in active markets for identical assets or liabilities.

Level 2 — Observable market-based inputs or unobservable inputs that are corroborated by market data.

Level 3 — Unobservable inputs that are not corroborated by market data.

Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

Asset Valuation Methodologies — Valuation methodologies maximize the use of relevant observable inputs and minimize the use of unobservable inputs. The following is a description of the valuation methodologies used to determine the fair value for each investment category and the fair value hierarchy tier to which each investment category has been assigned.

Common stock — Amounts are invested exclusively in common stock issued by the Corporation. The unit price (value) for shares is computed daily based on the closing price of the Corporation’s common stock on the New York Stock Exchange and the number of shares of stock. Employer stock is classified as Level 1 investments.

Mutual funds (including the domestic and international stock funds, balanced fund, money market fund, and bond funds) — The shares of mutual funds are valued at the daily closing price as reported by the fund. Mutual funds held by the Plan are open-end mutual funds that are registered with the Securities and Exchange Commission. These funds are required to publish their daily net asset value and to transact at that price. The mutual funds held by the Plan are deemed to be actively traded. Mutual funds are classified as Level 1 investments.

Common/collective trusts — These investments are valued at the net asset value of units of the common/collective trust. The net asset value as provided by the trustee is used as a practical expedient to estimate fair value. The net asset value is based on the fair value of the underlying investments held by the fund less its liabilities. This practical expedient is not used when it is determined to be probable that the fund will sell the investment for an amount different than the reported net asset value. Due to the nature of these funds, there are no unfunded commitments or redemption restrictions.

A summary of the Corporation master trust (“Master Trust”) assets (Note 4) measured at fair value on a recurring basis set forth by level within the fair value hierarchy is presented in the following tables:


	Quoted Prices
	in Active		Significant
	Markets for		Other	Significant
	Identical		Observable	Unobservable
	Assets		Inputs	Inputs
As of December 31, 2025	(Level 1)		(Level 2)	(Level 3)	Total
Investments at fair value:

Common stock	$	584,308,768	-	-	$	584,308,768
Mutual funds	378,042,751		-	-	378,042,751



Total investments in the fair value hierarchy	$	962,351,519	-	-	$	962,351,519
Investments measured at net asset value:*
Common/collective trusts					3,923,794,692
Total investments at net asset value					3,923,794,692
Total investments at fair value					$	4,886,146,211


	Quoted Prices
	in Active		Significant
	Markets for		Other	Significant
	Identical		Observable	Unobservable
	Assets		Inputs	Inputs
As of December 31, 2024	(Level 1)		(Level 2)	(Level 3)	Total
Investments at fair value:

Common stock	$	629,712,621	-	-	$	629,712,621

Mutual funds	338,282,336		-	-	338,282,336
Total investments in the fair value hierarchy	$	967,994,957	-	-	$	967,994,957
Investments measured at net asset value:*
Common/collective trusts					3,463,633,998
Total investments at net asset value					3,463,633,998
Total investments at fair value					$	4,431,628,955


*			In accordance with Subtopic 820-10, certain investments that were measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy. The fair value amounts presented in these tables are intended to permit reconciliation of the fair value hierarchy to the line items presented in the statements of net assets available for benefits.

- 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
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 4: http://www.xbrl.org/2003/role/exampleRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (b)
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 14: http://www.xbrl.org/2003/role/exampleRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
-Subparagraph (SX 210.6A-04(2)(b))
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Reference 16: http://www.xbrl.org/2003/role/exampleRef
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Reference 17: http://www.xbrl.org/2003/role/exampleRef
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Reference 18: http://www.xbrl.org/2003/role/exampleRef
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Reference 19: http://www.xbrl.org/2003/role/exampleRef
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Reference 20: http://www.xbrl.org/2003/role/exampleRef
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Reference 21: http://www.xbrl.org/2003/role/exampleRef
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Reference 22: http://www.xbrl.org/2003/role/disclosureRef
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Reference 23: http://www.xbrl.org/2003/role/disclosureRef
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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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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

PROHIBITED TRANSACTIONS	12 Months Ended
Dec. 31, 2025
EBP 015
EBP, Contingency [Line Items]
PROHIBITED TRANSACTIONS	PROHIBITED TRANSACTIONS In 2024, the Company discovered inadvertent uses of Plan assets by the Company due to administrative errors. Participant contributions of $62 were not timely deposited into participant accounts. These errors resulted in an impermissible extension of credit from the Plan to the Company in violation of Code section 4975(c)(1)(B). The Company corrected the errors in 2025 by depositing the missed participant contributions, plus lost earnings, into the affected participant accounts.

STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS - EBP 015	12 Months Ended
	Dec. 31, 2025 USD ($)
Investment income (loss):
Net appreciation (depreciation) in fair value of investments	$ 319,114,614
Interest and dividends	23,556,388
Net investment income (loss)	342,671,002
Contributions:
Participant contributions	110,553,573
Employer contributions	1,345,436
Total contributions	111,899,009
Total additions	454,570,011
DEDUCTIONS FROM NET ASSETS ATTRIBUTED TO:
Distributions to participants	220,598,935
Administrative expenses	1,781,686
Total deductions	222,380,621
NET INCREASE (DECREASE) IN NET ASSETS	232,189,390
NET ASSETS AVAILABLE FOR BENEFITS:
Beginning of year	2,389,799,139
End of year	$ 2,621,988,529

FAIR VALUE MEASUREMENT (Details) - EBP 015 - Master Trust - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP, Master Trust [Line Items]
Investments at fair value	$ 4,886,146,211	$ 4,431,628,955
Common stock
EBP, Master Trust [Line Items]
Investments at fair value	584,308,768	629,712,621
Mutual funds
EBP, Master Trust [Line Items]
Investments at fair value	378,042,751	338,282,336
Common/collective trusts
EBP, Master Trust [Line Items]
Investments at fair value	3,923,794,692	3,463,633,998
Total
EBP, Master Trust [Line Items]
Investments at fair value	962,351,519	967,994,957
Total \| Common stock
EBP, Master Trust [Line Items]
Investments at fair value	584,308,768	629,712,621
Total \| Mutual funds
EBP, Master Trust [Line Items]
Investments at fair value	378,042,751	338,282,336
Level 1
EBP, Master Trust [Line Items]
Investments at fair value	962,351,519	967,994,957
Level 1 \| Common stock
EBP, Master Trust [Line Items]
Investments at fair value	584,308,768	629,712,621
Level 1 \| Mutual funds
EBP, Master Trust [Line Items]
Investments at fair value	378,042,751	338,282,336
Level 2
EBP, Master Trust [Line Items]
Investments at fair value	0	0
Level 2 \| Common stock
EBP, Master Trust [Line Items]
Investments at fair value	0	0
Level 2 \| Mutual funds
EBP, Master Trust [Line Items]
Investments at fair value	0	0
Level 3
EBP, Master Trust [Line Items]
Investments at fair value	0	0
Level 3 \| Common stock
EBP, Master Trust [Line Items]
Investments at fair value	0	0
Level 3 \| Mutual funds
EBP, Master Trust [Line Items]
Investments at fair value	0	0
Net asset value
EBP, Master Trust [Line Items]
Investments at fair value	3,923,794,692	3,463,633,998
Net asset value \| Common/collective trusts
EBP, Master Trust [Line Items]
Investments at fair value	$ 3,923,794,692	$ 3,463,633,998

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Dec. 31, 2025
EBP 015
EBP, Accounting Policy [Line Items]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Accounting — The accompanying financial statements of the Plan have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Use of Estimates — The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of net assets available for benefits and changes therein and disclosure of contingent assets and liabilities. Actual results could differ from those estimates. Risks and Uncertainties — The Plan utilizes various investment securities. Investment securities, in general, are exposed to various risks, such as interest rate, credit, and overall market volatility. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect the value of the participants’ account balances and amounts reported in the financial statements. Investment Valuation and Income Recognition — Investments are reported at fair value with the exception of fully benefit-responsive investment contracts, which are reported at contract value. Fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note 3 for discussion of fair value measurements. Dividend income is recorded as of the ex-dividend date. Dividends are reinvested in a related participant fund. Interest income is recorded on the accrual basis. Purchases and sales of securities are recorded as of the trade date. Net appreciation (depreciation) includes the Plan’s gains and losses on investments bought and sold as well as held during the year. For fully benefit-responsive investment contracts, contract value is the relevant measurement attribute for that portion of the net assets available for benefits attributable to the contracts because contract value is the amount participants would receive if they were to initiate permitted transactions under the terms of the Plan. The statements of net assets available for benefits present the fully benefit-responsive investment contracts at contract value. The statement of changes in net assets available for benefits presents the activity of the fully benefit-responsive investment contracts on a contract value basis. All investment management and transaction fees directly related to the Plan investments are paid by the Plan. Management fees and operating expenses charged to the Plan for investments are deducted from income earned and are not separately reflected. Consequently, investment management fees and operating expenses are reflected as a reduction in the investment return for such investments within net appreciation (depreciation). Contributions — Participant and employer matching contributions are recorded in the year in which the contributions are withheld from participants’ compensation. Administrative Expenses — Administrative expenses of the Plan are paid by the Plan or the Company. The Company is obligated pursuant to the terms of a collective bargaining agreement to pay active participant recordkeeping expenses. Recordkeeping expenses for participants separated from service are deducted from the accounts of those participants. The Managed Account Program’s management fee also is deducted from the accounts of participants who have elected to participate in the Managed Account Program. Distributions to Participants — Distributions are recorded when paid. There were no amounts allocated to accounts of persons who have elected to withdraw from the Plan but have not yet been paid at December 31, 2025 and 2024.

DESCRIPTION OF PLAN	12 Months Ended
DESCRIPTION OF PLAN	Dec. 31, 2025
EBP 015
EBP, Description of Plan [Line Items]
DESCRIPTION OF PLAN	DESCRIPTION OF PLAN The following description of the Union Pacific Agreement Employee 401(k) Retirement Thrift Plan (the “Plan”) is provided for general information only. Participants should refer to the Plan document for more complete information. General — The Plan is a defined contribution plan covering employees of the Union Pacific Railroad Company (a subsidiary of Union Pacific Corporation) and its railroad affiliates (the “Company”) who are represented for the purposes of collective bargaining by a rail union to which eligibility to participate in the Plan has been extended. The Plan covers employees who have completed one year of service or were employees as of the effective date of the Plan, July 1, 1990. Vanguard Fiduciary Trust Company (“VFTC”) serves as the trustee of the Plan. The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”). Plan Administration — The Plan is administered by the Named Fiduciary - Plan Administration. The Senior Vice President and Chief Human Resource Officer of Union Pacific Railroad Company currently serves in this role. Contributions — Each year, participants may contribute 1% to 75% of their eligible compensation on a salary deferral basis. A participant may designate all or a portion of his/her pre-tax contribution as a Roth contribution. Participants may also contribute 1% to 75% of their eligible compensation on an after-tax basis. Combined after-tax, Roth, and pre-tax contributions may not exceed 75% of eligible compensation. Participants who will attain age 50 before the end of the Plan year are eligible to make catch-up contributions. The Company contributes to the Plan on behalf of each participant who contributes to the Plan and is represented by a rail union that negotiated a matching contribution with the Company. For the participants eligible for a Company match, the Company’s matching contribution is an amount equal to 50% of the participant’s combined pre-tax, designated Roth, and after-tax contributions that are not in excess of 6% of the participant’s eligible compensation for the payroll period. All contributions to the Plan are subject to applicable limitations specified in the Internal Revenue Code of 1986, as amended (the "Code"). Participant Loans — The Plan does not offer a participant loan feature. Participant Accounts — An individual account is maintained for each Plan participant. Participants may direct the investment of their account into various investment options offered by the Plan. For all contribution types, participants have the option to direct their investment allocation at their discretion, except that a participant may not direct more than 20% of contributions into the Union Pacific common stock fund, a separately managed account mainly composed of Union Pacific Corporation (the “Corporation”) common stock. Contributions and earnings may be redirected or transferred to other investments at the direction of the participant, except that a participant may not elect to transfer amounts into the Union Pacific common stock fund if such transfer would result in more than 20% of the participant’s account to be invested in such fund. Alternatively, a participant may elect to participate in the Vanguard advisers managed account program (“Managed Account Program”). The Managed Account Program is a program in which certain participants may delegate ongoing, discretionary investment management decisions with respect to their account to Vanguard Advisers, Inc. Each participant’s account is credited with the participant’s contributions, employer-matching contributions (if applicable), and an allocation of the Plan’s earnings (losses) based on the investment options selected and their performance. The allocations are based on each participant’s account balance by investment option. If a participant does not provide investment directions (or has not elected to participate in the Managed Account Program) with respect to an amount credited to their account, such amount is invested in a default investment option designated under the Plan. The benefit to which a participant is entitled is the benefit that can be provided from the participant’s vested account. The Union Pacific common stock fund is an employee stock ownership plan and designated as the Union Pacific ESOP common stock fund (“ESOP”). With respect to common stock dividends paid to the ESOP and credited to a participant’s Plan account, the participant may elect either to receive an immediate distribution of the dividend or reinvest the dividend in the Union Pacific common stock fund. Absent an affirmative election, a participant is deemed to have elected dividend reinvestment. A participant’s election (or deemed election) is evergreen until affirmatively changed by the participant. Vesting — Participants at all times have a 100% vested interest in their accounts. Distributions to Participants — Following a participant’s separation from service, a distribution of benefits will be made upon request in a single sum payment. The portion of a participant’s account invested in the Union Pacific common stock fund, if any, is distributed in cash unless shares of stock are elected at the time of distribution (“in-kind distribution”). In-kind distributions are single sum and any fractional shares are distributed in cash. A participant who separated from service must receive (or begin receiving) distribution of his or her account no later than the participant’s required beginning date, as defined in the Plan. If distribution is deferred until the participant’s required beginning date, the participant's account will be distributed as either a single sum or in the form of monthly, quarterly, semi-annual, or annual installments, as elected by the participant. If the participant remains employed with the Company after attaining age 70 ½ (or, if the participant’s date of birth is after June 30, 1949, the age determined under Section 401(a)(9) of the Code, based on the participant's date of birth), the participant must either take a single sum distribution or begin installment payments of his/her account no later than April 1st of the year following the year in which the participant separated from service. If the participant dies prior to receiving distribution of his or her entire account, the remaining account balance is distributed to the participant's beneficiary in accordance with the terms of the Plan. In-service withdrawals, including withdrawals of rollover contributions or after-tax contributions, qualified birth or adoption distributions, hardship withdrawals, and withdrawals on and after age 59 ½, may be made by a participant from his or her account in accordance with the Plan’s provisions. Subsequent Events Evaluation — We evaluated the effects of all subsequent events through June 26, 2026, the financial statement issuance date. On May 14, 2026, the Company’s and Union Pacific Fruit Express Company’s respective Boards of Directors approved a proposed merger of the Union Pacific Fruit Express Company Agreement Employee 401(k) Retirement Thrift Plan into the Plan. The merger is expected to be effective on or about October 1, 2026. Benefits will not change as a part of the plan merger action for participants in either plan.

MASTER TRUST - Plan's Interest (Details) - EBP 015 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Master Trust
EBP, Master Trust [Line Items]
Investments at fair value	$ 4,886,146,211	$ 4,431,628,955
Investments at contract value	275,010,684	292,899,727
Total investments	5,161,156,895	4,724,528,682
Master Trust \| Common stock
EBP, Master Trust [Line Items]
Investments at fair value	584,308,768	629,712,621
Master Trust \| Mutual funds
EBP, Master Trust [Line Items]
Investments at fair value	378,042,751	338,282,336
Master Trust \| Common/collective trusts
EBP, Master Trust [Line Items]
Investments at fair value	3,923,794,692	3,463,633,998
Plan Interest
EBP, Master Trust [Line Items]
Investments at fair value	2,493,359,756	2,255,766,032
Investments at contract value	128,628,773	134,033,107
Total investments	2,621,988,529	2,389,799,139
Plan Interest \| Common stock
EBP, Master Trust [Line Items]
Investments at fair value	278,434,724	298,768,450
Plan Interest \| Mutual funds
EBP, Master Trust [Line Items]
Investments at fair value	181,850,446	160,634,840
Plan Interest \| Common/collective trusts
EBP, Master Trust [Line Items]
Investments at fair value	$ 2,033,074,586	$ 1,796,362,742

MASTER TRUST

12 Months Ended

Dec. 31, 2025

EBP 015

EBP, Master Trust [Line Items]

MASTER TRUST

At December 31, 2025 and 2024, the Plan participated in a Master Trust with other retirement plans sponsored by the Corporation or its subsidiaries. The investment assets of the Master Trust are held at VFTC. Use of the Master Trust permits the commingling of the trust assets of a number of benefit plans of the Corporation and its subsidiaries for investment and administrative purposes. Although assets are commingled in the Master Trust, VFTC maintains supporting records for the purpose of allocating the net investment income (loss) of the investment accounts to the various participating plans. The investment valuation methods for investments held by the Master Trust are discussed in Note 3.

The Plan’s interest in the Master Trust is presented in the following tables:


	2025				2024
As of December 31,	Master Trust		Plan Interest		Master Trust		Plan Interest
Investments at fair value:

Common stock	$	584,308,768	$	278,434,724	$	629,712,621	$	298,768,450

Mutual funds	378,042,751		181,850,446		338,282,336		160,634,840



Common/collective trusts	3,923,794,692		2,033,074,586		3,463,633,998		1,796,362,742
Investments at fair value	4,886,146,211		2,493,359,756		4,431,628,955		2,255,766,032
Investments at contract value	275,010,684		128,628,773		292,899,727		134,033,107
Total investments	$	5,161,156,895	$	2,621,988,529	$	4,724,528,682	$	2,389,799,139

Investment income (loss) for the Master Trust is as follows:


For the Year Ended December 31,	2025
Net appreciation (depreciation) in fair value	$	623,375,325
Interest and dividends	49,162,096
Total investment income (loss) of Master Trust	$	672,537,421
Plan's portion of Master Trust investment income (loss)	$	342,671,002

While the Plan participates in the Master Trust, each participant’s account is allocated earnings (or losses) consistent with the performance of the funds in which the participant’s account is invested. Therefore, the investment income (loss) of the Master Trust may not be allocated evenly among the plans participating in the Master Trust.

The Master Trust provides participants a stable value investment option, the Union Pacific fixed income fund, that invests primarily in synthetic guaranteed investment contracts (“GICs”) backed by high-credit-quality fixed income investments and traditional GICs issued by insurance companies. Traditional GICs are issued by insurance companies and provide for benefit-responsive withdrawals by Plan participants at contract value. Contract value represents contributions made plus interest accrued at the contract rate, less withdrawals. The crediting rate on traditional contracts is typically fixed for the life of the investment. The contracts are backed by the assets in an insurance company’s general account or a separate account. Synthetic GICs pair Plan-owned fixed income investments with an insurance-like feature known as a “wrap contract” issued by a bank or life insurance company. The crediting interest rate is based on a formula agreed upon with the issuer, but may not be less than 0%. The crediting rate of the contract resets every quarter based on the performance of the underlying investment portfolio. To the extent that the Union Pacific fixed income fund has unrealized gains and losses, the interest crediting rate may differ from then-current market rates. These contracts meet the fully benefit-responsive investment contract criteria and therefore are reported at contract value. Contract value is the relevant measure for fully benefit-responsive investment contracts because this is the amount received by participants if they were to initiate permitted transactions under the terms of the Plan.

Certain events might limit the ability of the Plan to transact at contract value with the contract issuer. These events could be different under each contract. Such events include layoffs, divisional sales, voluntary or involuntary reductions in workforce, Plan-wide re-enrollments, or other events that are outside the normal operation of the Plan that causes a withdrawal from an investment contract. Plan management does not believe that the occurrence of any such event, which would limit the Plan’s ability to transact at contract value with participants, is probable.

In addition, certain events allow the issuer to terminate the contracts with the Plan and settle at an amount different from contract value. Those events could be different under each contract. Such events include a change in qualification status of a participant, employer, or Plan; a breach of material obligations under the contract and misrepresentation by the contract holder; or failure of the underlying portfolio to conform to the pre-established investment guidelines.

The following table represents the disaggregation of contract value between GICs held by the Master Trust:


As of December 31,	2025		2024
Synthetic investment contracts	$	268,605,195	$	269,689,102
Traditional investment contracts	6,405,489		23,210,625

- 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

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+ 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

STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS - EBP 015 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
ASSETS:
Investments at fair value (Note 3 and 4)	$ 2,493,359,756	$ 2,255,766,032
Investments at contract value (Note 4)	128,628,773	134,033,107
NET ASSETS AVAILABLE FOR BENEFITS	$ 2,621,988,529	$ 2,389,799,139

- 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

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) - EBP 015	12 Months Ended
	Dec. 31, 2025
EBP, Accounting Policy [Line Items]
Basis of Accounting	Basis of Accounting — The accompanying financial statements of the Plan have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).
Use of Estimates	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 net assets available for benefits and changes therein and disclosure of contingent assets and liabilities. Actual results could differ from those estimates.
Risks and Uncertainties	Risks and Uncertainties — The Plan utilizes various investment securities. Investment securities, in general, are exposed to various risks, such as interest rate, credit, and overall market volatility. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect the value of the participants’ account balances and amounts reported in the financial statements.
Investment Valuation and Income Recognition	Investment Valuation and Income Recognition — Investments are reported at fair value with the exception of fully benefit-responsive investment contracts, which are reported at contract value. Fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. See Note 3 for discussion of fair value measurements. Dividend income is recorded as of the ex-dividend date. Dividends are reinvested in a related participant fund. Interest income is recorded on the accrual basis. Purchases and sales of securities are recorded as of the trade date. Net appreciation (depreciation) includes the Plan’s gains and losses on investments bought and sold as well as held during the year. For fully benefit-responsive investment contracts, contract value is the relevant measurement attribute for that portion of the net assets available for benefits attributable to the contracts because contract value is the amount participants would receive if they were to initiate permitted transactions under the terms of the Plan. The statements of net assets available for benefits present the fully benefit-responsive investment contracts at contract value. The statement of changes in net assets available for benefits presents the activity of the fully benefit-responsive investment contracts on a contract value basis. All investment management and transaction fees directly related to the Plan investments are paid by the Plan. Management fees and operating expenses charged to the Plan for investments are deducted from income earned and are not separately reflected. Consequently, investment management fees and operating expenses are reflected as a reduction in the investment return for such investments within net appreciation (depreciation).
Contributions	Contributions — Participant and employer matching contributions are recorded in the year in which the contributions are withheld from participants’ compensation.
Administrative Expenses	Administrative Expenses — Administrative expenses of the Plan are paid by the Plan or the Company. The Company is obligated pursuant to the terms of a collective bargaining agreement to pay active participant recordkeeping expenses. Recordkeeping expenses for participants separated from service are deducted from the accounts of those participants. The Managed Account Program’s management fee also is deducted from the accounts of participants who have elected to participate in the Managed Account Program.
Distributions to Participants	Distributions to Participants — Distributions are recorded when paid. There were no amounts allocated to accounts of persons who have elected to withdraw from the Plan but have not yet been paid at December 31, 2025 and 2024.

- Definition

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

+ References + Details

MASTER TRUST (Tables)

12 Months Ended

Dec. 31, 2025

EBP 015

EBP, Master Trust [Line Items]

Schedule of Master Trust

The Plan’s interest in the Master Trust is presented in the following tables:


	2025				2024
As of December 31,	Master Trust		Plan Interest		Master Trust		Plan Interest
Investments at fair value:

Common stock	$	584,308,768	$	278,434,724	$	629,712,621	$	298,768,450

Mutual funds	378,042,751		181,850,446		338,282,336		160,634,840



Common/collective trusts	3,923,794,692		2,033,074,586		3,463,633,998		1,796,362,742
Investments at fair value	4,886,146,211		2,493,359,756		4,431,628,955		2,255,766,032
Investments at contract value	275,010,684		128,628,773		292,899,727		134,033,107
Total investments	$	5,161,156,895	$	2,621,988,529	$	4,724,528,682	$	2,389,799,139

Investment income (loss) for the Master Trust is as follows:


For the Year Ended December 31,	2025
Net appreciation (depreciation) in fair value	$	623,375,325
Interest and dividends	49,162,096
Total investment income (loss) of Master Trust	$	672,537,421
Plan's portion of Master Trust investment income (loss)	$	342,671,002

The following table represents the disaggregation of contract value between GICs held by the Master Trust:


As of December 31,	2025		2024
Synthetic investment contracts	$	268,605,195	$	269,689,102
Traditional investment contracts	6,405,489		23,210,625

- 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

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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

FAIR VALUE MEASUREMENT (Tables)

12 Months Ended

Dec. 31, 2025

EBP 015

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

Summary of Master Trust Measured at Fair Value


	Quoted Prices
	in Active		Significant
	Markets for		Other	Significant
	Identical		Observable	Unobservable
	Assets		Inputs	Inputs
As of December 31, 2025	(Level 1)		(Level 2)	(Level 3)	Total
Investments at fair value:

Common stock	$	584,308,768	-	-	$	584,308,768
Mutual funds	378,042,751		-	-	378,042,751



Total investments in the fair value hierarchy	$	962,351,519	-	-	$	962,351,519
Investments measured at net asset value:*
Common/collective trusts					3,923,794,692
Total investments at net asset value					3,923,794,692
Total investments at fair value					$	4,886,146,211


	Quoted Prices
	in Active		Significant
	Markets for		Other	Significant
	Identical		Observable	Unobservable
	Assets		Inputs	Inputs
As of December 31, 2024	(Level 1)		(Level 2)	(Level 3)	Total
Investments at fair value:

Common stock	$	629,712,621	-	-	$	629,712,621

Mutual funds	338,282,336		-	-	338,282,336
Total investments in the fair value hierarchy	$	967,994,957	-	-	$	967,994,957
Investments measured at net asset value:*
Common/collective trusts					3,463,633,998
Total investments at net asset value					3,463,633,998
Total investments at fair value					$	4,431,628,955


*			In accordance with Subtopic 820-10, certain investments that were measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy. The fair value amounts presented in these tables are intended to permit reconciliation of the fair value hierarchy to the line items presented in the statements of net assets available for benefits.

- 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

MASTER TRUST - Disaggregation of Contract Value (Details) - EBP 015 - Master Trust - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP, Master Trust [Line Items]
Investments at contract value	$ 275,010,684	$ 292,899,727
Synthetic investment contracts
EBP, Master Trust [Line Items]
Investments at contract value	268,605,195	269,689,102
Traditional investment contracts
EBP, Master Trust [Line Items]
Investments at contract value	$ 6,405,489	$ 23,210,625

- 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

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+ Details

MASTER TRUST - Investment Income (Loss) (Details) - EBP 015	12 Months Ended
	Dec. 31, 2025 USD ($)
EBP, Master Trust [Line Items]
Interest and dividends	$ 23,556,388
Net investment income (loss)	$ 342,671,002
Minimum crediting interest rate	0.00%
Master Trust
EBP, Master Trust [Line Items]
Net appreciation (depreciation) in fair value	$ 623,375,325
Interest and dividends	49,162,096
Net investment income (loss)	672,537,421
Plan Interest
EBP, Master Trust [Line Items]
Net investment income (loss)	$ 342,671,002

- 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

FORM 5500, SCHEDULE H, PART IV, LINE 4(a) – SCHEDULE OF DELINQUENT PARTICIPANT CONTRIBUTIONS (Details) - EBP 015	12 Months Ended
	Dec. 31, 2025 USD ($)
EBP, Schedule of Delinquent Participant Contribution [Line Items]
Entity Tax Identification Number	94-6001323
Plan Number	015
Contributions Not Corrected	$ 0
Contributions Corrected Outside VFCP	62
Contributions Pending Correction in VFCP	0
Total Fully Corrected under VFCP and PTE 2002-51	$ 0

- 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

Reference 2: 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 II))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

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

Reference 4: 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 III))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (3)
-Publisher DOL-EBSA

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (4)
-Publisher DOL-EBSA

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 6
-Paragraph d
-Subparagraph (1)
-Publisher DOL-EBSA

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 6
-Paragraph d
-Subparagraph (2)
-Publisher DOL-EBSA

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (2)
-Publisher DOL-EBSA

+ Details

DESCRIPTION OF PLAN (Details) - EBP 015	12 Months Ended
DESCRIPTION OF PLAN (Details) - EBP 015	Dec. 31, 2025 year
EBP, Description of Plan [Line Items]
Required service period	1 year
Participant contribution, combined, maximum percentage of eligible compensation	75.00%
Employer contribution, matching percentage	50.00%
Employer contribution, participant compensation matched, percentage	6.00%
Discretionary investment allocation allowed, maximum percentage of contributions	20.00%
Vesting percentage	100.00%
Still employed, participant age for distribution (in year)	70.5
Minimum
EBP, Description of Plan [Line Items]
Participant contribution, contribution to eligible compensation, percentage	1.00%
Participant contribution, after tax, contribution to eligible compensation, percentage	1.00%
Maximum
EBP, Description of Plan [Line Items]
Participant contribution, contribution to eligible compensation, percentage	75.00%
Participant contribution, after tax, contribution to eligible compensation, percentage	75.00%

FEDERAL INCOME TAX STATUS	12 Months Ended
FEDERAL INCOME TAX STATUS	Dec. 31, 2025
EBP 015
EBP, Tax Status [Line Items]
FEDERAL INCOME TAX STATUS	FEDERAL INCOME TAX STATUS The Plan obtained a tax determination letter dated June 12, 2017, in which the Internal Revenue Service (“IRS”) stated that the Plan, as then designed, was in compliance with the applicable requirements of the Code. Although the Plan has been amended since receiving the determination letter, the Company and Plan management believe that the Plan and the related Master Trust are currently designed and being operated in compliance with the applicable requirements of the Code. Therefore, no provision for income taxes has been included in the Plan’s financial statements. GAAP requires Plan management to evaluate tax positions taken by the Plan and recognize a tax liability (or asset) if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress.

Cover	12 Months Ended
Cover	Dec. 31, 2025
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	UNION PACIFIC CORPORATION
Amendment Flag	false
Entity Central Index Key	0000100885
EBP 015
Document Information [Line Items]
Document Type	11-K
Entity Registrant Name	UNION PACIFIC CORPORATION
Amendment Flag	false
Entity Central Index Key	0000100885

PROHIBITED TRANSACTIONS (Details)	12 Months Ended
PROHIBITED TRANSACTIONS (Details)	Dec. 31, 2024 USD ($)
EBP 015
EBP, Risk and Uncertainty [Line Items]
Participant contribution not timely deposited into participant accounts	$ 62

PLAN TERMINATION	12 Months Ended
PLAN TERMINATION	Dec. 31, 2025
EBP 015
EBP, Description of Plan [Line Items]
PLAN TERMINATION	PLAN TERMINATION Although it has not expressed any intent to do so, the Company has the right under the Plan, at any time, to terminate the Plan subject to the provisions of ERISA. Regardless of such actions, the principal and income of the Plan remains for the exclusive benefit of the Plan’s participants and beneficiaries. The Company may direct VFTC either to distribute the Plan’s assets to the participants or to continue the Trust and distribute benefits as though the Plan had not been terminated.