Director — James G. Pratt: The filing reports the retirement of a long-serving board member with immediate internal succession to committee roles, indicating an orderly and non-disruptive change.

Results of Operations and Financial Condition . On July 30, 2026 , Heartland Express, Inc. announced its unaudited financial results for the quarter ended June 30, 2026. The press release is attached as Exhibit 99.1 to this Form 8-K and is incorporated herein by reference.

OTHER EVENTS On June 12, 2026, Heartland Express, Inc. (the “Company”) announced the declaration of a quarterly cash dividend. A copy of the press release issued by the Company is attached as Exhibit 99.1.

The filing details compensation increases and equity awards for named executive officers.

Results of Operations and Financial Condition . On April 23, 2026 , Heartland Express, Inc. announced its unaudited financial results for the quarter ended March 31, 2026. The press release is attached as Exhibit 99.1 to this Form 8-K and is incorporated herein by reference.

President of Millis Transfer — David P. Millis: David P. Millis retired as President of Millis Transfer but will continue to serve as a director.

Director — Dr. Benjamin J. Allen: Dr. Allen decided not to stand for re-election at the Annual Meeting.

OTHER EVENTS On March 13, 2026, Heartland Express, Inc. (the “Company”) announced the declaration of a quarterly cash dividend. A copy of the press release issued by the Company is attached as Exhibit 99.1.

Results of Operations and Financial Condition . On February 3, 2026, Heartland Express, Inc. announced its unaudited financial results for the quarter and year ended December 31, 2025. The press release is attached as Exhibit 99.1 to this Form 8-K and is incorporated herein by reference.

Chief Administrative Officer — Joshua Helmich: The filing announces the appointment of Joshua Helmich as Chief Administrative Officer of Heartland Express following the integration of Contract Freighters, Inc., which is a role change/promotion rather than a loss of a senior executive from the consolidated entity.

OTHER EVENTS On December 16, 2025, Heartland Express, Inc. (the “Company”) announced the declaration of a quarterly cash dividend. A copy of the press release issued by the Company is attached as Exhibit 99.1.

Results of Operations and Financial Condition . On October 31, 2025 , Heartland Express, Inc. announced its unaudited financial results for the quarter ended September 30, 2025. The press release is attached as Exhibit 99.1 to this Form 8-K and is incorporated herein by reference.

Director — David P. Millis: The filing discloses an equity grant to a director, which is a compensatory arrangement rather than a management departure or appointment.

OTHER EVENTS On September 12, 2025, Heartland Express, Inc. (the “Company”) announced the declaration of a quarterly cash dividend. A copy of the press release issued by the Company is attached as Exhibit 99.1.

Results of Operations and Financial Condition . On July 24, 2025 , Heartland Express, Inc. announced its unaudited financial results for the quarter ended June 30, 2025. The press release is attached as Exhibit 99.1 to this Form 8-K and is incorporated herein by reference.

OTHER EVENTS On June 13, 2025, Heartland Express, Inc. (the “Company”) announced the declaration of a quarterly cash dividend. A copy of the press release issued by the Company is attached as Exhibit 99.1.

Results of Operations and Financial Condition . On April 30, 2025 , Heartland Express, Inc. announced its unaudited financial results for the quarter ended March 31, 2025. The press release is attached as Exhibit 99.1 to this Form 8-K and is incorporated herein by reference.

OTHER EVENTS On March 14, 2025, Heartland Express, Inc. (the “Company”) announced the declaration of a quarterly cash dividend. A copy of the press release issued by the Company is attached as Exhibit 99.1.

Results of Operations and Financial Condition . On January 28, 2025, Heartland Express, Inc. announced its unaudited financial results for the quarter and year ended December 31, 2024. The press release is attached as Exhibit 99.1 to this Form 8-K and is incorporated herein by reference.

CFO — Christopher A. Strain: The filing discloses routine equity grants to existing executives rather than a change in management or officer status.

OTHER EVENTS On December 17, 2024, Heartland Express, Inc. (the “Company”) announced the declaration of a quarterly cash dividend. A copy of the press release issued by the Company is attached as Exhibit 99.1.

President — David P. Millis: The filing discloses an equity grant to a named executive officer, which is a compensatory arrangement rather than a change in management status.

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. As previously disclosed, Mr. Michael J. Sullivan, a member of the Audit and Risk Committee of the Board of Directors (the “Board”) of Heartland Express, Inc. (the “Company”), passed away on September 14, 2024. Following Mr. Sullivan’s passing, the Company and the Board have been considering the appropriate composition of the Audit and Risk Committee. On November 29, 2024, the Company received…

Results of Operations and Financial Condition . On October 29, 2024 , Heartland Express, Inc. announced its unaudited financial results for the quarter ended September 30, 2024. The press release is attached as Exhibit 99.1 to this Form 8-K and is incorporated herein by reference.

Director — Michael J. Sullivan: The filing announces the death of an independent director, which is a permanent departure from the board but not a loss of a senior executive officer like a CEO or CFO.