Exhibit 99.1 For Immediate Release April 28, 2026 LANDSTAR SYSTEM REPORTS IMPROVED FIRST QUARTER PERFORMANCE REVENUE OF $1.171B AND EARNINGS PER SHARE OF $1.16 Jacksonville, FL - Landstar System, Inc. (NASDAQ: LSTR) ("Landstar" or the "Company") today reported its financial results for the 2026 first quarter. The Company reported total revenue of $1.171 billion in the 2026 first quarter, an increase of 2% as compared to revenue of $1.153 billion in the 2025 first quarter, and basic and diluted earnings per ...