trn-20260514

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 11-K


þ			ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2025


¨			TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number 1-6903

A. Full title of the plan and the address of the plan, if different from that of the issuer named below:

TRINITY INDUSTRIES, INC. 401(k) PLAN AS RESTATED EFFECTIVE AUGUST 1, 2020

B. Name of issuer of the securities held pursuant to the plan and the address of its principal executive office:

14221 N. Dallas Parkway, Suite 1100

Dallas, Texas 75254-2957

Financial Statements and Supplemental Schedule

Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

As of December 31, 2025 and 2024, and for the

Year Ended December 31, 2025

Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

Financial Statements and Supplemental Schedule

As of December 31, 2025 and 2024, and

for the Year Ended December 31, 2025

Contents


Report of Independent Registered Public Accounting Firm (PCAOB ID: 42)			4

Audited Financial Statements
Statements of Net Assets Available for Benefits			5
Statement of Changes in Net Assets Available for Benefits			6
Notes to Financial Statements			7

Supplemental Schedule
Schedule H, Line 4i - Schedule of Assets (Held at End of Year)			13

Table of Contents

Report of Independent Registered Public Accounting Firm

To the Plan Participants and the Plan Administrator of Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

Opinion on the Financial Statements

We have audited the accompanying statements of net assets available for benefits of Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020 (the Plan) as of December 31, 2025 and 2024, and the related statement of changes in net assets available for benefits for the year ended December 31, 2025, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the net assets available for benefits of the Plan at December 31, 2025 and 2024, and the changes in its net assets available for benefits for the year ended December 31, 2025, in conformity with U.S. generally accepted accounting principles.

Basis for Opinion

These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on the Plan’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Plan in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Supplemental Schedule Required by ERISA

The accompanying supplemental schedule of assets (held at end of year) as of December 31, 2025 (referred to as the “supplemental schedule”), has been subjected to audit procedures performed in conjunction with the audit of the Plan’s financial statements. The information in the supplemental schedule is the responsibility of the Plan’s management. Our audit procedures included determining whether the information reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental schedule. In forming our opinion on the information, we evaluated whether such information, including its form and content, is presented in conformity with the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, the information is fairly stated, in all material respects, in relation to the financial statements as a whole.

/s/ ERNST & YOUNG LLP

We have served as the Plan's auditor since 1987.

Dallas, Texas

May 15, 2026

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Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

Statements of Net Assets Available for Benefits


	December 31,
	2025		2024
	(in millions)
Assets

Investments, at fair value	$	432.3	$	378.8

Receivables:
Participant contributions	0.5		0.5
Company contributions	0.7		0.6
Notes receivable from participants	7.4		6.0
Total receivables	8.6		7.1
Total assets	$	440.9	$	385.9

Liabilities and Net Assets Available for Benefits
Other liabilities	$	—	$	0.4
Net assets available for benefits	$	440.9	$	385.5

See accompanying notes to financial statements.

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Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

Statement of Changes in Net Assets Available for Benefits


	Year Ended
	December 31, 2025
	(in millions)
Additions
Contributions:
Participants	$	20.2
Company	12.4
Rollover	1.0
	33.6


Net appreciation in the fair value of investments	59.9
Interest and dividend income	3.5
Interest income on notes receivable from participants	0.5
Total additions	97.5

Deductions

Benefits paid to participants	41.5
Administrative expenses	0.6
Total deductions	42.1





Net increase	55.4
Net assets available for benefits at beginning of year	385.5
Net assets available for benefits at end of year	$	440.9

See accompanying notes to financial statements.

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Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

Notes to Financial Statements

December 31, 2025

1. Description of the Plan

The following brief description of the Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020 (the "Plan") is provided for general information only. 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 designed to comply with the provisions of the Employee Retirement Income Security Act of 1974, as amended ("ERISA"), and is sponsored by Trinity Industries, Inc. (the "Company"). Voya Financial (the "Trustee" and "Recordkeeper") serves as the plan trustee and recordkeeper.

Administration of the Plan

The Plan is administered by the Retirement Plan Committee (the "Committee"), consisting of at least three persons who are appointed by the Finance and Risk Committee of the Board of Directors of the Company (the "FRC"). The members of the Committee serve at the discretion of the FRC, and any Committee member who is an employee of the Company does not receive compensation for their services. The expenses incurred by the Trustee in the performance of its duties, including the Trustee's compensation, and the expenses charged by the Recordkeeper of the Plan, are paid by the Plan unless paid by the Company. All other expenses are paid by the Company and are excluded from these financial statements.

Participation

Each employee of the Company is eligible to contribute to the Plan immediately upon employment, and must meet each of the following additional requirements:

1.Must be in a unit of employees who are designated as eligible to participate in the Plan; and

2.Must not be included in a unit of employees covered by a collective bargaining agreement, unless benefits under the Plan were included in an agreement as a result of good faith bargaining.

Any eligible employee who does not make an election to either participate or not participate in the Plan is automatically enrolled in the Plan with a deferral rate of 6% of their eligible contribution.

Contributions

Under the Plan, each participant electing to contribute agrees to contribute not less than 1% nor more than 50% of their eligible compensation, as defined in the Plan, and subject to certain limitations of the Internal Revenue Code of 1986, as amended (the "Code"), in 1% increments as designated by the participant. Each automatically enrolled participant contributes 6% of their eligible compensation. A salary reduction and contribution agreement may be entered into by each employee as the employee begins participation in the Plan, and may be amended by the participant at any time. Participants who have attained the age of 50 before the end of the year are eligible to make catch-up contributions. Additionally, the Plan provides for a true-up matching contribution to ensure that eligible participants who elected to contribute the maximum contribution allowed by the Plan receive the maximum matching contribution of eligible compensation determined as of the end of the Plan year.

In 2021, the Plan utilized a safe harbor design for the matching contribution structure with a Qualified Automatic Contribution Arrangement ("QACA"). Effective July 1 of each year, employees who are contributing less than 15% to the Plan will have their deferral increased by 1% up to a maximum auto-escalation cap of 15%. Employees who wish to opt-out of the auto-escalation may do so at any time.

For each calendar year, from January 1 through December 31 ("Plan Year"), the Company will make an Enhanced Matching Contribution on a per-pay-period basis, as defined by the Plan. Under the Enhanced Matching Contribution, each participant shall receive an amount equal to a dollar-for-dollar Company match of such participant's contribution which does not exceed 6% of such participant's total eligible compensation for the year, as defined by the Plan, regardless of years of service. Company contributions are net of forfeitures, as defined by the Plan. For the 2025 Plan Year, the Enhanced Matching Contribution totaled $12.4 million.

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Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

Notes to Financial Statements

December 31, 2025

Participant Accounts

Each participant's account is credited with the participant's contributions and allocations of (a) the Company's contributions and (b) Plan earnings, and is charged with an allocation of administrative expenses. Allocations are based on participant earnings or account balances, as defined by the Plan. The benefit to which a participant is entitled is the benefit that can be provided from the participant's vested account. Participants may direct daily the investment of participant and Company contributions among various registered investment companies, common/collective trust funds, and a Company common stock fund. If a participant is automatically enrolled, their contributions are invested in the Vanguard Target Retirement Income Trust II Fund that most closely matches their estimated retirement age.

Benefits

Distribution of a participant's vested account balance is payable upon retirement at or after the age of 59 1/2, total disability, death, or termination of employment. Distribution is equal to the salary reduction contributions and related earnings, plus the vested portion of any Company contributions and related earnings.

Withdrawals of up to 100% of the participant's contributions can be made only to meet immediate and heavy financial needs, as defined by the Plan, and only to the extent that such funds are not available to the participant for such needs from other sources. No hardship withdrawals are allowed against the earnings on participant contributions or against any Company contributions and related earnings. These restrictions are not applicable to Enhanced Matching Contributions when the participant reaches the age of 59 1/2.

Upon request, distributions shall be made no earlier than the month that follows the last day of the month in which entitlement occurs. Distributions from the Company common stock accounts shall be made in cash unless otherwise designated by the participant.

Participant Loans

Loans may be made for a minimum of $1,000 up to a maximum of $50,000, not to exceed 50% of the participant's contribution balance and related earnings plus 50% of the vested portion of the Enhanced Matching Contribution balance and related earnings. Loans are subject to rules and regulations established by the Committee, as defined by the Plan.

If a participant's employment is terminated, any outstanding loan balances must either be repaid immediately to the Plan or continue to be repaid to the Plan according to the original terms of the loan or they will be considered to be in default, in which case the unpaid loan balance will be treated as a distribution to the participant.

Vesting

The Company contributions and related earnings vest to participants depending upon the number of years of vesting service, as defined by the Plan, completed by such participant as follows:



Years of Service	Percentage Vested
Less than 2 years	0	%
2 or more years	100	%

Participants are 100% vested in Company contributions and the allocated portion of related earnings upon their attainment of age 65, total and permanent disability or death, and are always 100% vested in participant contributions and the related earnings on such contributions.

Forfeitures

The amounts forfeited by participants who terminate employment prior to becoming fully vested are first used to reduce employer contributions. Any excess amounts may then be used to pay the Plan's share of allocable fees and other administrative expenses of the Plan.

Trinity Stock Fund

The Plan invests in common stock of the Company through the Trinity Stock Fund. The Trinity Stock Fund may also hold cash or other short-term securities, although these are expected to be a small percentage of the fund. The Company has implemented a dividend pass-through election for its participants.

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Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

Notes to Financial Statements

December 31, 2025

The Plan limits the amount a participant can invest in the Trinity Stock Fund to encourage diversification of participants' accounts. Each payroll period, a participant can direct up to a maximum of 25% of their contributions in the Trinity Stock Fund. In addition, a participant may not transfer amounts from other investment funds into the Trinity Stock Fund to the extent the transfer would result in more than 25% of the participant's total account balance being invested in the Trinity Stock Fund.

Each participant is entitled to exercise voting rights attributable to the shares allocated to their account and is notified by the Company prior to the time that such rights may be exercised. The Trustee shall vote any allocated shares for which instructions have not been given by a participant pursuant to written directions from the Company. The Trustee votes any unallocated shares in the same proportion as those shares that were allocated, unless the Company directs the Trustee otherwise. Participants have the same voting rights in the event of a tender or exchange offer.

Amendment or Termination of the Plan

The Company may amend the Plan at any time. However, no amendment, unless made to secure approval of the Internal Revenue Service (the "IRS") or other governmental agency, shall operate retroactively to reduce or divest the then-vested interest in the Plan of any participant, former participant, or beneficiary, or to reduce or divest any benefit payable under the Plan unless all participants, former participants, and beneficiaries then having vested interests or benefit payments affected thereby consent to such amendment.

Although it has not expressed any intent to do so, the Company may terminate the Plan at any time, subject to the provisions of ERISA. Upon complete or partial termination, the accounts of all participants affected thereby shall become 100% vested, and the Committee shall direct the Trustee to distribute the assets in the Plan, after receipt of any required approval by the IRS and payment of any expenses properly chargeable thereto, to participants, former participants, and beneficiaries in proportion to their respective account balances.

2. Significant Accounting Policies

Basis of Accounting

The financial statements of the Plan are prepared on the accrual basis of accounting. Benefits paid to participants are recorded when paid.

Valuation of Investments

Investments in the Plan are valued at fair value. Investments in registered investment companies are valued at published market prices. Investments in common/collective trust funds are valued at the net asset value per share ("NAV") as determined by the issuer based on the underlying fair value of its net assets. The Trinity Stock Fund invests primarily in the Company's common stock with a fractional amount invested in interest-bearing cash equivalents. Investments in common stock of the Company are stated at fair value based on quoted market prices. See Note 3 for further discussion and disclosures related to fair value measurements.

Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividends are recorded on the ex-dividend date. Realized gains and losses from security transactions are reported using average cost. Net appreciation or depreciation includes the Plan's gains and losses on investments bought and sold as well as held during the year.

Notes Receivable from Participants

Notes receivable from participants represent participant loans that are recorded at their unpaid principal balance plus any accrued but unpaid interest. Interest income on notes receivable from participants is recorded when it is earned. Related fees are recorded as administrative expenses and are expensed when incurred. There were no allowances for credit losses recorded as of December 31, 2025 or 2024. If a participant ceases to make loan repayments and the plan administrator deems the participant loan to be a distribution, the participant loan balance is reduced and a benefit payment is recorded.

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates that affect the amounts in the financial statements and accompanying notes and supplemental schedule. Actual results could differ from these estimates.

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Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

Notes to Financial Statements

December 31, 2025

Related-Party Transactions

As of December 31, 2025 and 2024, the interest-bearing cash equivalent portion of the Trinity Stock Fund was managed by the Trustee, and therefore, these transactions qualified as party-in-interest transactions. Additionally, a portion of the Plan's assets is invested in the Company's common stock. Because the Company is the Plan Sponsor, transactions involving the Company's common stock qualify as party-in-interest transactions. Under ERISA, all of these transactions are exempt from the prohibited transaction rules.

3. Fair Value Measurement

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for that asset or liability in an orderly transaction between market participants on the measurement date. An entity is required to establish a fair value hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. The three levels of inputs that may be used to measure fair values are listed below.

•Level 1 – This level is defined as quoted prices in active markets for identical assets or liabilities. As of December 31, 2025 and 2024, Level 1 assets held by the Plan include the Trinity Stock Fund and registered investment companies.

•Level 2 – This level is defined as observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. As of December 31, 2025 and 2024, Level 2 assets held by the Plan include the common/collective trust funds.

•Level 3 – This level is defined as unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. As of December 31, 2025 and 2024, there are no Level 3 assets held by the Plan.

The following tables set forth, by level within the fair value hierarchy, the investments of the Plan that are measured at fair value.


	December 31, 2025
	Level 1		Level 2		Total
	(in millions)
Trinity Stock Fund	$	8.2	$	—	$	8.2
Registered investment companies	37.6		—		37.6
Common/collective trust funds	—		386.5		386.5
Total investments at fair value	$	45.8	$	386.5	$	432.3


	December 31, 2024
	Level 1		Level 2		Total
	(in millions)
Trinity Stock Fund	$	11.0	$	—	$	11.0
Registered investment companies	34.2		—		34.2
Common/collective trust funds	—		333.6		333.6
Total investments at fair value	$	45.2	$	333.6	$	378.8

4. Investments

The Plan provides for investments 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 accompanying statements of net assets available for benefits.

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Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

Notes to Financial Statements

December 31, 2025

5. Income Tax Status

The Plan has received a determination letter from the IRS dated April 19, 2017, stating that the Plan is qualified under Section 401(a) of the Code, and therefore, the related trust is exempt from taxation. Subsequent to receiving the determination letter, the Plan was amended and restated. The Plan is required to operate in conformity with the Code to maintain its qualification. The plan administrator believes the Plan is being operated in compliance with the applicable requirements of the Code and therefore believes the Plan, as amended and restated, is qualified and the related trust is tax-exempt.

Generally accepted accounting principles in the U.S. require plan management to evaluate uncertain tax positions taken by the Plan. The financial statement effects of a tax position are recognized when the position is more likely than not, based on the technical merits, to 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 are no uncertain positions taken or expected to be taken. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress.

Table of Contents

Supplemental Schedule

Table of Contents

Trinity Industries, Inc. 401(k) Plan as Restated Effective August 1, 2020

EIN #75-0225040 Plan #029

Schedule H, Line 4i - Schedule of Assets

(Held at End of Year)

December 31, 2025

(a)

(b)

(c)

(d)

(e)

Identity of Issue, Borrower, Lessor, or Similar Party

Description of Investment, Including Maturity Date, Rate of Interest, Collateral, Par, or Maturity Value

Cost

Current Value

(in millions)

Common/Collective Trust Funds:

Putnam Investments Stable Value

Common/Collective Trust Fund - 27,863,462 shares

27.9

Fidelity Growth Company Commingled Pool Class A

Common/Collective Trust Fund - 1,065,303 shares

94.5

Northern Trust S&P 500 Index

Common/Collective Trust Fund - 90,496 shares

62.6

Northern Trust Aggregate Bond Index

Common/Collective Trust Fund - 142,365 shares

19.1

Northern Trust Extended Equity Market Index

Common/Collective Trust Fund - 21,128 shares

8.7

Northern Trust ACWI ex US IMI

Common/Collective Trust Fund - 75,155 shares

18.8

MFS Mid Cap Growth Fund Class CT

Common/Collective Trust Fund - 5,010 shares

0.1

Vanguard Target Retirement 2020 Trust II

Common/Collective Trust Fund - 161,617 shares

8.5

Vanguard Target Retirement 2025 Trust II

Common/Collective Trust Fund - 64,975 shares

3.7

Vanguard Target Retirement 2030 Trust II

Common/Collective Trust Fund - 639,290 shares

38.0

Vanguard Target Retirement 2035 Trust II

Common/Collective Trust Fund - 133,367 shares

8.4

Vanguard Target Retirement 2040 Trust II

Common/Collective Trust Fund - 542,781 shares

37.3

Vanguard Target Retirement 2045 Trust II

Common/Collective Trust Fund - 100,845 shares

7.3

Vanguard Target Retirement 2050 Trust II

Common/Collective Trust Fund - 402,102 shares

30.1

Vanguard Target Retirement 2055 Trust II

Common/Collective Trust Fund - 67,960 shares

6.8

Vanguard Target Retirement 2060 Trust II

Common/Collective Trust Fund - 79,445 shares

6.3

Vanguard Target Retirement 2065 Trust II

Common/Collective Trust Fund - 89,783 shares

4.4

Vanguard Target Retirement Income Trust II

Common/Collective Trust Fund - 79,761 shares

4.0

Total Common/Collective Trust Funds

386.5

Registered Investment Companies:

JPMorgan Mid Cap Value R6

Registered Investment Fund - 164,242 shares

5.2

Harbor Small Cap Growth Instl

Registered Investment Fund - 283,802 shares

4.4

Principal SmallCap Value II R6

Registered Investment Fund - 276,301 shares

3.2

American Funds Europacific Growth R6

Registered Investment Fund - 117,377 shares

7.1

JHancock Disciplined Value R6

Registered Investment Fund - 299,264 shares

7.4

PGIM Total Return Bond R6

Registered Investment Fund - 849,012 shares

10.3

Total Registered Investment Companies

37.6

Common Stock:

Trinity Industries, Inc.

Common Stock - 308,935 shares

8.2

Total Common Stock

8.2

Total Investments at Fair Value

432.3

Notes Receivable from Participants

Participant loans - various maturities, interest rates from 3.25% to 9.50%

7.4

*Party-in-interest

**Cost information is not required for participant-directed investments and, therefore, is not included.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this Annual Report to be signed on its behalf by the undersigned hereunto duly authorized.

Trinity Industries, Inc. 401(k) Plan as Restated Effective Effective August 1, 2020.


/s/ Keran G. Bellah
Keran G. Bellah
Member, Retirement Plan Committee
May 15, 2026

/s/ David C. DelVecchio
David C. DelVecchio
Member, Retirement Plan Committee
May 15, 2026

/s/ Douglas J. Horvath
Douglas J. Horvath
Member, Retirement Plan Committee
May 15, 2026

/s/ John M. Lee
John M. Lee
Member, Retirement Plan Committee
May 15, 2026

/s/ Christina N. Maldonado
Christina N. Maldonado
Member, Retirement Plan Committee
May 15, 2026

/s/ Eric R. Marchetto
Eric R. Marchetto
Member, Retirement Plan Committee
May 15, 2026

/s/ Jerald L. Martin
Jerald L. Martin
Member, Retirement Plan Committee
May 15, 2026

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INDEX TO EXHIBITS


Exhibit No.						Description
23						Consent of Independent Registered Public Accounting Firm
101.INS						Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH						Inline XBRL Taxonomy Extension Schema Document (filed electronically herewith).
101.CAL						Inline XBRL Taxonomy Extension Calculation Linkbase Document (filed electronically herewith).
101.LAB						Inline XBRL Taxonomy Extension Label Linkbase Document (filed electronically herewith).
101.PRE						Inline XBRL Taxonomy Extension Presentation Linkbase Document (filed electronically herewith).
101.DEF						Inline XBRL Taxonomy Extension Definition Linkbase Document (filed electronically herewith).
104						Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).

SEC Form 11-K filed by Trinity Industries Inc.