Landstar provides for the estimated costs of self-insured claims primarily on an actuarial basis. The amount recorded for the estimated liability for claims incurred is based upon the facts and circumstances known on the applicable balance sheet date. The ultimate resolution of these claims may be for an amount greater or less than the amount estimated by management. The Company continually revises its existing claim estimates as new or revised information becomes available on the status of each claim. Historically, the Company has experienced both favorable and unfavorable development of prior years’ claims estimates within its various programs.

The following table summarizes the adverse effect of the increase in the cost of insurance claims resulting fronfavorable development of prior year self-insured claims estimates on operating income, net income and basic and diluted earnings per share set forth in the consolidated statements of income for the and thirteen-week periods ended June 28, 2025 and June 29, 2024 (in thousands, except per share amounts):

The unfavorable development of prior years’ claims during the period ended June 28, 2025 was primarily attributable to elevated cargo loss experience as a result of fraud and theft in the supply chain and several specific commercial trucking claims.