TRINITY INDUSTRIES INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)

For the fiscal year ended December 31, 2025

Commission File Number 1-6903

(Exact name of registrant as specified in its charter)

Registrant's telephone number, including area code:(214)631-4420

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes þ No¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes¨ No þ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes þ No¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer þ Accelerated filer¨ Non-accelerated filer¨

Smaller reporting company☐ Emerging growth company¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☑

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes☐ Noþ

The aggregate market value of voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold as of the last business day of the registrant's most recently completed second fiscal quarter (June 30, 2025) was $2,167.6 million.

At February 12, 2026, the number of shares of common stock, $0.01 par value, outstanding was 79,839,720.

The information required by Part III of this report, to the extent not set forth herein, is incorporated by reference from the registrant's definitive 2026 Proxy Statement.

TRINITY INDUSTRIES, INC.

FORM 10-K

TABLE OF CONTENTS

Forward-Looking Statements

This annual report on Form 10-K (or statements otherwise made by the Company or on the Company’s behalf from time to time in other reports, filings with the Securities and Exchange Commission (“SEC”), news releases, conferences, website postings, or otherwise) contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Any statements contained herein that are not historical facts are forward-looking statements and involve risks and uncertainties. These forward-looking statements include expectations, beliefs, plans, objectives, future financial performances, estimates, projections, goals, and forecasts. Trinity uses the words “anticipates,” “believes,” “estimates,” “expects,” “intends,” “forecasts,” “may,” “will,” “should,” and similar expressions to identify these forward-looking statements. Potential factors, which could cause our actual results of operations to differ materially from those in the forward-looking statements, include, among others:

•market conditions and customer demand for our business products and services;

•the cyclical nature of the industries in which we compete;

•actions by U.S. and/or foreign governments (particularly Mexico and Canada) relative to tariffs, trade policies, federal government budgeting, taxation policies, government expenditures, borrowing/debt ceiling limits, and government shutdowns;

•variations in weather in areas where our products are manufactured, delivered, or used;

•naturally-occurring events, pandemics, fires, and/or disasters causing disruption to our facilities, manufacturing, product deliveries, and production capacity, thereby giving rise to an increase in expenses, loss of revenue, and property losses;

•disruptions in the transportation network used to transport parts and components to our production facilities and to deliver products to our customers, particularly with respect to the delivery of finished railcars from Mexico to the U.S., which may impact our ability to manufacture and timely deliver railcars to our customers;

•shortages of labor;

•impacts from asset impairments and related charges;

•the timing of introduction of new products;

•the inability to effectively integrate acquired businesses;

•the timing and delivery of customer orders, lease portfolio sales, or a breach of customer contracts;

•the creditworthiness of customers and their access to capital;

•product price changes;

•changes in mix of products sold;

•the costs incurred to align manufacturing capacity with demand and the extent of its utilization;

•the operating leverage and efficiencies that can be achieved by our manufacturing businesses;

•availability and costs of steel, component parts, supplies, and other raw materials;

•competition and other competitive factors;

•changing technologies, including our ability to effectively integrate artificial intelligence ("AI") into our business;

•material failure, interruption of service, compromised data security, phishing emails, or cybersecurity breaches in our information technology (or that of the third-party vendors who provide information technology or other services);

•surcharges and other fees added to fixed pricing agreements for steel, component parts, supplies, and other raw materials;

•inflation, interest rates, and capital costs;

•counter-party risks for financial instruments;

•long-term funding of our operations;

•taxes;

•the stability of the governments and political and business conditions in certain foreign countries, particularly Mexico;

•fluctuations in foreign currency exchange rates, particularly the Mexican peso;

•geopolitical events, including armed conflicts, and their impact on supply chains, pricing, and the global economy;

•changes in import and export quotas and regulations;

•business conditions in emerging economies;

•costs and results of litigation, including trial and appellate costs;

•changes in accounting standards or inaccurate estimates or assumptions in the application of accounting policies;

•changes in laws and regulations that may have an adverse effect on demand for our products and services, our results of operations, financial condition, or cash flows;

•legal, regulatory, and environmental issues, including compliance of our products with mandated specifications, standards, or testing criteria and obligations to remove and replace our products following installation or to recall our products and install different products;

•the use of social or digital media to disseminate false, misleading and/or unreliable or inaccurate information; and

•the inability to sufficiently protect our intellectual property rights.

Any forward-looking statement speaks only as of the date on which such statement is made. Except as required by federal securities laws, Trinity undertakes no obligation to update any forward-looking statement to reflect events or circumstances after the date on which such statement is made. For a discussion of risks and uncertainties, which could cause actual results to differ from those contained in the forward-looking statements, see Item 1A, “Risk Factors” included elsewhere herein.