UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 8-K

CURRENT REPORT

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

Date of Report (Date of earliest event reported): May 11, 2018 (May 11, 2018)

ARCBEST CORPORATION

(Exact name of registrant as specified in its charter)

8401 McClure Drive

Fort Smith, Arkansas 72916

(479) 785-6000

(Address, including zip code, and telephone number, including area code, of

the registrant's principal executive offices)

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.

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

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

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

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

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).

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.☐

ITEM 8.01 – OTHER EVENTS

On May 11, 2018, ArcBest® (Nasdaq: ARCB) provided an update announcing that its ABF Freight System, Inc., (“ABF”) employees represented by the International Brotherhood of Teamsters (“IBT”), have ratified ABF’s national collective bargaining agreement that will be in effect through June 30, 2023. A majority of the supplements to the ABF National Master Freight Agreement also passed. The remaining supplemental agreements will require additional action relating to various local work rules and other technical items before the entire contract becomes effective. A copy of an update on this development is furnished as an exhibit to this Report on Form 8-K.

ITEM 9.01 – FINANCIAL STATEMENTS AND EXHIBITS.

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.” 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: 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; relationships with employees, including unions, and our ability to attract and retain 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; the loss or reduction of business from large customers; the cost, timing, and performance of growth initiatives; competitive initiatives and pricing pressures; 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; greater than expected funding requirements for our nonunion defined benefit pension plan; 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; governmental regulations; environmental laws and regulations, including emissions-control regulations; the cost, integration, and performance of any recent or future acquisitions; not achieving some or all of the expected financial and operating benefits of our corporate restructuring or incurring additional costs or operational inefficiencies as a result of the restructuring; union and nonunion employee wages and benefits, including changes in required contributions to multiemployer plans; litigation or claims asserted against us; the loss of key employees or the inability to execute succession planning strategies; default on covenants of financing arrangements and the availability and terms of future financing arrangements; timing and amount of capital expenditures; self-insurance claims and insurance premium costs; 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; 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 and fuel and related taxes; potential impairment of goodwill and intangible assets; maintaining our intellectual property rights, brand, and corporate reputation; seasonal fluctuations and adverse weather conditions; regulatory, economic, and other risks arising from our international business; antiterrorism and safety measures; and other financial, operational, and legal risks and uncertainties detailed from time to time in ArcBest’s public filings with the Securities and Exchange Commission (“SEC”).

SIGNATURES

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.