UNITED STATES SECURITIES and EXCHANGE COMMISSION Washington, D.C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year December 31, 2020. ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period from to . Commission file number 0-19969 ARCBEST CORPORATION (Exact name of registrant as specified in its charter) Delaware 71-0673405 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 8401 McClure Drive, Fort Smith, Arkansas 72916 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code 479-785-6000 Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, $0.01 Par Value ARCB The Nasdaq Global Select Market Securities registered pursuant to Section 12(g) of the Act: None (Title of Class) 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. Large accelerated filer ☒ 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. ☒ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒ The aggregate market value of the Common Stock held by nonaffiliates of the registrant, based on the closing price of the shares of Common Stock on the Nasdaq Global Select Market as of June 30, 2020, was $658,708,492. The number of shares of Common Stock, $0.01 par value, outstanding as of February 19, 2021, was 25,397,696. DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s Definitive Proxy Statement to be filed pursuant to Regulation 14A of the Securities Exchange Act of 1934 in connection with the registrant’s Annual Stockholders’ Meeting to be held April 29, 2021, are incorporated by reference in Part III of this Form 10-K. 1 ARCBEST CORPORATION FORM 10-K TABLE OF CONTENTS ITEM PAGE NUMBER NUMBER PART I Forward-Looking Statements 3 Item 1. Business 4 Item 1A. Risk Factors 17 Item 1B. Unresolved Staff Comments 30 Item 2. Properties 31 Item 3. Legal Proceedings 31 Item 4. Mine Safety Disclosures 31 PART II Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities 32 Item 6. Selected Financial Data 33 Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations 34 Item 7A. Quantitative and Qualitative Disclosures About Market Risk 63 Item 8. Financial Statements and Supplementary Data 67 Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure 113 Item 9A. Controls and Procedures 113 Item 9B. Other Information 116 PART III Item 10. Directors, Executive Officers and Corporate Governance 116 Item 11. Executive Compensation 116 Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters 116 Item 13. Certain Relationships and Related Transactions, and Director Independence 116 Item 14. Principal Accountant Fees and Services 116 PART IV Item 15. Exhibits and Financial Statement Schedules 117 Item 16. Form 10-K Summary 121 SIGNATURES 122 2 PART I Forward-Looking Statements This Annual Report on Form 10-K contains certain “forward-looking statements” within the meaning of the federal securities laws. All statements, other than statements of historical fact, included or incorporated by reference in this Annual Report on Form 10-K, including, but not limited to, those in Item 1 (Business), Item 1A (Risk Factors), Item 3 (Legal Proceedings), and Item 7 (Management’s Discussion and Analysis of Financial Condition and Results of Operations), are forward-looking statements. Terms such as “anticipate,” “believe,” “could,” “estimate,” “expect,” “forecast,” “foresee,” “intend,” “may,” “plan,” “predict,” “project,” “scheduled,” “should,” “would,” and similar expressions and the negatives of such terms are intended to identify forward-looking statements. These statements are based on management’s beliefs, assumptions, and expectations based on currently available information, are not guarantees of future performance, and involve certain risks and uncertainties (some of which are beyond our control). Although we believe that the expectations reflected in these forward-looking statements are reasonable as and when made, we cannot provide assurance that our expectations will prove to be correct. Actual outcomes and results could materially differ from what is expressed, implied, or forecasted in these statements due to a number of factors, including, but not limited to: widespread outbreak of an illness or disease, including the COVID-19 pandemic and its effects, or any other public health crisis, as well as regulatory measures implemented in response to such events; external events which may adversely affect us or the third parties who provide services for us, for which our business continuity plans may not adequately prepare us; a failure of our information systems, including disruptions or failures of services essential to our operations or upon which our information technology platforms rely, data breach, and/or cybersecurity incidents; interruption or failure of third-party software or information technology systems or licenses; untimely or ineffective development and implementation of, or failure to realize potential benefits associated with, new or enhanced technology or processes, including the pilot test program at ABF Freight; the loss or reduction of business from large customers; the ability to manage our cost structure, and the timing and performance of growth initiatives; maintaining our corporate reputation and intellectual property rights; competitive initiatives and pricing pressures; increased prices for and decreased availability of new revenue equipment, decreases in value of used revenue equipment, and higher costs of equipment-related operating expenses such as maintenance, fuel, and related taxes; availability of fuel, the effect of volatility in fuel prices and the associated changes in fuel surcharges on securing increases in base freight rates, and the inability to collect fuel surcharges; relationships with employees, including unions, and our ability to attract, retain, and develop employees; unfavorable terms of, or the inability to reach agreement on, future collective bargaining agreements or a workforce stoppage by our employees covered under ABF Freight’s collective bargaining agreement; union employee wages and benefits, including changes in required contributions to multiemployer plans; availability and cost of reliable third-party services; our ability to secure independent owner operators and/or operational or regulatory issues related to our use of their services; litigation or claims asserted against us; governmental regulations; environmental laws and regulations, including emissions-control regulations; default on covenants of financing arrangements and the availability and terms of future financing arrangements; self-insurance claims and insurance premium costs; potential impairment of goodwill and intangible assets; general economic conditions and related shifts in market demand that impact the performance and needs of industries we serve and/or limit our customers’ access to adequate financial resources; seasonal fluctuations and adverse weather conditions; and other financial, operational, and legal risks and uncertainties detailed from time to time in ArcBest Corporation’s public filings with the Securities and Exchange Commission (“SEC”). For additional information regarding known material factors that

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