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June 30

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K/A

Amendment No. 1

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CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

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Date of Report (Date of earliest event reported): May 18, 2026 (May 15, 2026)

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ARCBEST CORPORATION

(Exact name of registrant as specified in its charter)

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Texas

0-19969

71-0673405

(State or other jurisdiction of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

8401 McClure Drive

Fort Smith, Arkansas

(Address of principal executive offices)

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72916

(Zip Code)

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Registrant’s telephone number, including area code: (479) 785-6000

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Not Applicable

(Former name or former address, if changed since last report)

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions.

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Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

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Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

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Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

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Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:

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Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock $0.01 Par Value

ARCB

Nasdaq

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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Emerging growth company☐

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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.☐

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Explanatory Note

On May 15, 2026, ArcBest Corporation (Nasdaq: ARCB) (the “Company”) filed a Current Report on Form 8-K (the “Initial Report”) disclosing the Company’s conversion from the State of Delaware to the State of Texas. This Amendment is being filed solely for the purpose of correcting a clerical error with respect to the State of Delaware being listed as the state of incorporation on the cover page, instead of the State of Texas. This Amendment contains only the cover page to this Form 8-K/A, this Explanatory Note, and the signature page. Except as set forth above, this Amendment does not modify or update any disclosure contained in the Initial Report or its exhibits and should be read in conjunction with the Initial Report and its exhibits.

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SIGNATURES

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Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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ARCBEST CORPORATION

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(Registrant)

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Date:

May 18, 2026

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/s/ J. Brent Hagy

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J. Brent Hagy

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Chief Legal Officer and Corporate Secretary

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