Cover and table of contents

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

For the fiscal year ended December 31**,** 2025

OR

For the transition period from ____________ to ____________.

Commission File Number: 0-19582

OLD DOMINION FREIGHT LINE, INC.

(Exact name of registrant as specified in its charter)

(336) 889-5000

(Registrant’s telephone number, including area code)

_______________________________________

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 ☒ 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 ☒

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 ☒ 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 ☒ 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.

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 ☐ No ☒

The aggregate market value of voting stock held by non-affiliates of the registrant as of June 30, 2025 was $30,418,290,020, based on the closing sales price as reported on the Nasdaq Global Select Market.

As of February 17, 2026, the registrant had 208,425,619 outstanding shares of Common Stock ($0.10 par value).

DOCUMENTS INCORPORATED BY REFERENCE

Certain portions of the Company’s Proxy Statement for the 2026 Annual Meeting of Shareholders are incorporated by reference into Part III of this report.

INDEX

FORWARD-LOOKIN****G INFORMATION

Forward-looking statements appear in this Annual Report, including but not limited to Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and in other written and oral statements made by or on behalf of us. These forward-looking statements include, but are not limited to, statements relating to our goals, strategies, expectations, competitive environment, compliance with regulations, availability of resources, future events and future financial performance. Such forward-looking statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements typically can be identified by such words as “anticipate,” “estimate,” “forecast,” “project,” “intend,” “expect,” “believe,” “should,” “could,” “may,” or other similar words or expressions. We caution readers that such forward-looking statements involve risks and uncertainties that could cause actual events or results to differ materially from those expressed or implied herein, including, but not limited to, the risk factors detailed in this Annual Report.

Our forward-looking statements are based on our beliefs and assumptions using information available at the time the statements are made. We caution the reader not to place undue reliance on our forward-looking statements as (i) these statements are neither a prediction nor a guarantee of future events or circumstances and (ii) the assumptions, beliefs, expectations and projections about future events may differ materially from actual results. We undertake no obligation to publicly update any forward-looking statement to reflect developments occurring after the statement is made, except to the extent required by law.

PART I