O'Reilly Automotive reported record third-quarter revenue and earnings for the period ended September 30, 2026, driven by strong demand across its professional and do-it-yourself businesses. Third-quarter comparable-store sales increased 7.2 percent, resulting in a two-year stack of 12.8 percent. Professional customer sales grew at a double-digit rate, while do-it-yourself sales advanced at a mid-single-digit rate. The company achieved significant financial milestones with gross profit rising 10 percent to $2.68 billion and net income increasing 8 percent to $786 million. Operating income rose 13 percent to $1.10 billion, representing 21.4 percent of sales. Diluted earnings per share gained 14 percent to $0.97, supported by a $39 million tariff-refund benefit that contributed to the overall earnings increase. Management raised its full-year 2026 outlook for comparable-store sales, revenue, gross margin, operating margin, and diluted earnings per share. The company now expects revenue between $19.0 billion and $19.3 billion with a diluted EPS range of $3.25 to $3.35. O'Reilly also plans to open 225 to 235 new stores in 2026, expanding its total location count to approximately 6,758 across the United States, Puerto Rico, Mexico, and Canada. Analysts and investors are closely watching fourth-quarter margin normalization as a key test of sustainability following the one-time tariff refund benefit. The stock received support from these strong results and the upgraded guidance, with shares trading at 80.15 euros on November 10, 2026. Expansion pace and comparable-store sales growth remain central execution tests for future performance.