RESULTS OF OPERATIONS AND FINANCIAL CONDITION ​ On November 4, 2026, ArcBest ® (Nasdaq: ARCB) (the “Company”) issued a press release announcing its unaudited third quarter 2026 results. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference. Additional supplemental information and presentation slides to be used in connection with the scheduled conference call to discuss the quarterly results are furnished as Exhibit 99.…

OTHER EVENTS ​ On October 30, 2026, ArcBest ® (Nasdaq: ARCB) issued a press release announcing the approval by the Board of Directors of a quarterly cash dividend of $0.12 per share to holders of record on November 13, 2026, payable on November 27, 2026. ​ A copy of the press release is filed as an exhibit to this Current Report on Form 8-K. ​

REGULATION FD DISCLOSURE ArcBest ® (Nasdaq: ARCB) is providing an update on the most recent information related to its third quarter 2026 financial results and business trends. ​ Summary Operating and Financial Impacts ● Statistics for August 2026 are preliminary but are not expected to differ materially from actual results. ● July 2026 and July 2025 each included 22.0 workdays. ● August 2026 and August 2025 each included 21.0 workdays. ● The third quarter to date reflects the period from Jul…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION ​ On July 29, 2026, ArcBest ® (Nasdaq: ARCB) (the “Company”) issued a press release announcing its unaudited second quarter 2026 results. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference. Additional supplemental information and presentation slides to be used in connection with the scheduled conference call to discuss the second quarter results are furnished as Exhibit…

OTHER EVENTS ​ On July 24, 2026, ArcBest ® (Nasdaq: ARCB) issued a press release announcing the approval by the Board of Directors of a quarterly cash dividend of $0.12 per share to holders of record on August 7, 2026, payable on August 21, 2026. ​ A copy of the press release is filed as an exhibit to this Current Report on Form 8-K. ​

of this Current Report on Form 8-K is incorporated by reference into this Item 2.06, to the extent applicable. ​ Forward-Looking Statements ​ The following is a “safe harbor” statement under the Private Securities Litigation Reform Act of 1995: Certain statements and information in this report may constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, including, among others, statements regarding (i) our expectations about our intri…

Material Impairments. ​ The information set forth in

Costs Associated With Exit or Disposal Activities. ​ The information set forth in

REGULATION FD DISCLOSURE ArcBest ® (Nasdaq: ARCB) is providing an update on the most recent information related to its second quarter 2026 financial results and business trends. ​ Summary Operating and Financial Impacts ● Statistics for May 2026 are preliminary but are not expected to differ materially from actual results. ● There were 21.5 workdays in April 2026, and there were 21.5 workdays in April 2025. ● There were 20.0 workdays in May 2026 and 21.0 workdays in May 2025. ● The second qua…

TERMINATION OF A MATERIAL DEFINITIVE AGREEMENT On May 18, 2026, ArcBest Corporation (the “ Company ”) and its wholly owned subsidiary, ArcBest Funding LLC (the “ Borrower ”), terminated the Third Amended and Restated Receivables Loan Agreement, dated as of June 9, 2021, as amended December 2, 2021, May 13, 2022, June 12, 2024, and June 12, 2025 (the “ Loan Agreement ”), by and among the Borrower, Toronto-Dominion Bank (“ TD Bank ”), and the other lender and facility agent parties thereto. ​ U…

MATERIAL MODIFICATION TO RIGHTS OF SECURITY HOLDERS On May 15, 2026, ArcBest Corporation (Nasdaq: ARCB) (the “ Company ”) filed (i) a certificate of conversion with the Secretary of State of the State of Delaware, (ii) a certificate of conversion with the Secretary of State of the State of Texas with a plan of conversion (the “ Plan of Conversion ”), and (iii) a certificate of formation with the Secretary of State of the State of Texas (the “ Texas Charter ” and, collectively with the certifi…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION ​ On April 28, 2026, ArcBest ® (Nasdaq: ARCB) (the “Company”) issued a press release announcing its unaudited first quarter 2026 results. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference. Additional supplemental information and presentation slides to be used in connection with the scheduled conference call to discuss the first quarter results are furnished as Exhibit 9…

OTHER EVENTS ​ On April 24, 2026, ArcBest ® (Nasdaq: ARCB) issued a press release announcing the approval by the Board of Directors of a quarterly cash dividend of $0.12 per share to holders of record on May 8, 2026, payable on May 22, 2026. ​ A copy of the press release is filed as an exhibit to this Current Report on Form 8-K. ​

REGULATION FD DISCLOSURE ArcBest ® (Nasdaq: ARCB) is providing an update on the most recent information related to its first quarter 2026 financial results and business trends. ​ Summary Operating and Financial Impacts ● Statistics for February 2026 are preliminary but are not expected to differ materially from actual results. ● There were 20.5 workdays in January 2026 and 22.0 workdays in January 2025. ● There were 20.0 workdays in February 2026 and 20.0 workdays in February 2025. ● The firs…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION ​ On January 30, 2026, ArcBest ® (Nasdaq: ARCB) (the “Company”) issued a press release announcing its unaudited fourth quarter 2025 and full year 2025 results. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference. Additional supplemental information and presentation slides to be used in connection with the scheduled conference call to discuss the fourth quarter and full ye…

Director — Ann G. Bordelon: The filing discloses the routine election of two new directors and the scheduled retirement of two long-serving directors, representing standard board refreshment rather than a sudden executive departure.

OTHER EVENTS ​ On January 27, 2026, ArcBest ® (Nasdaq: ARCB) issued a press release announcing the approval by the Board of Directors of a quarterly cash dividend of $0.12 per share to holders of record on February 10, 2026, payable on February 24, 2026. ​ A copy of the press release is filed as an exhibit to this Current Report on Form 8-K. ​

REGULATION FD DISCLOSURE ArcBest ® (Nasdaq: ARCB) is providing an update on the most recent information related to its fourth quarter 2025 financial results and business trends. ​ Summary Operating and Financial Impacts ● Statistics for November 2025 are preliminary but are not expected to differ materially from actual results. ● There were 23.0 workdays in October 2025 and 23.0 workdays in October 2024. ● There were 18.0 workdays in November 2025 and 19.0 workdays in November 2024. ● The fou…

ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT ​ Please see the discussion set forth in Item 2.03, “Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant,” of this Current Report on Form 8-K, which discussion is incorporated by reference into this

CREATION OF A DIRECT FINANCIAL OBLIGATION OR AN OBLIGATION UNDER AN OFF-BALANCE SHEET ARRANGEMENT OF A REGISTRANT ​ On November 25, 2025, ArcBest Corporation (the “Company”) amended and restated its existing revolving credit facility (the “Credit Facility”) pursuant to a Fifth Amended and Restated Credit Agreement (the “Credit Agreement”) among the Company and certain of its subsidiaries that become party thereto from time to time, as borrowers, U.S. Bank National Association and the other fi…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION ​ On November 5, 2025, ArcBest ® (Nasdaq: ARCB) (the “Company”) issued a press release announcing its unaudited third quarter 2025 results. A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference. Additional supplemental information and presentation slides to be used in connection with the scheduled conference call to discuss the third quarter results are furnished as Exhibit…

OTHER EVENTS ​ On October 31, 2025, ArcBest ® (Nasdaq: ARCB) issued a press release announcing the approval by the Board of Directors of a quarterly cash dividend of $0.12 per share to holders of record on November 14, 2025, payable on November 28, 2025. ​ A copy of the press release is filed as an exhibit to this Current Report on Form 8-K. ​

CEO — Judy R. McReynolds: The filing discloses the previously announced retirement of the CEO, which is an orderly succession event rather than a sudden loss of a sitting executive.

OTHER EVENTS ​ On September 15, 2025, ArcBest ® (Nasdaq: ARCB) issued a press release announcing the approval by the Board of Directors to increase the company’s share repurchase authorization to a total of $125 million. ​ A copy of the press release is filed as an exhibit to this Current Report on Form 8-K. ​

REGULATION FD DISCLOSURE ArcBest ® (Nasdaq: ARCB) is providing an update on the most recent information related to its third quarter 2025 financial results and business trends. ​ Summary Operating and Financial Impacts ● Statistics for August 2025 are preliminary but are not expected to differ materially from actual results. ● There were 22.0 workdays in July 2025 and 21.5 workdays in July 2024. ● There were 21.0 workdays in August 2025 and 22.0 workdays in August 2024. ● The third quarter to…