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AutoZone (AZO) is trading higher after a stronger-than-expected Q4 profit and favorable margin swing outweighed another revenue miss. Gross margin expanded 182 bps and operating profit increased 10.1%, but modest comparable-sales growth and the temporary nature of the tariff-refund and LIFO benefits leave questions about the durability of the earnings improvement.

• Gross margin increased to 53.3%, benefiting by 145 bps from tariff refunds and 105 bps from a favorable net non-cash LIFO impact. Because those benefits totaled 250 bps, higher commercial mix and other factors offset approximately 68 bps, indicating that the underlying margin performance was weaker than the headline expansion.
• Operating expenses increased 100 bps to 33.4% of sales, primarily because of growth initiatives. Operating profit still reached $1.3 bln, but SG&A deleverage absorbed a meaningful portion of the gross-margin benefit.
• Reported total-company same-store sales increased 2.7%, including 1.6% domestic growth and a currency-assisted 10.7% international increase. Total comps rose 1.5% in constant currency, with international growth of 1.3%. Domestic commercial sales increased 8.6% to $1.91 bln, although average weekly sales per program grew only 2.7%, showing that network expansion contributed materially to growth.
• Management said the selling environment was difficult during the first eight weeks of Q4 but strengthened during the final eight weeks. AZO expects sales to accelerate across the U.S., Mexico, and Brazil during FY27, providing a constructive forward indicator despite the soft full-quarter comps.
• AZO opened 175 stores during Q4, including 16 U.S. Mega Hubs, and 374 during FY26, ending the year with 8,031 locations. Inventory increased 10.1% to $7.74 bln, while the company repurchased $697.5 mln of stock in Q4 and retained $1.6 bln of authorization.

Briefing.com Analyst Insight

The earnings beat demonstrates AZO’s ability to convert moderate sales growth into stronger profit when LIFO turns favorable and unusual benefits support gross margin. However, tariff refunds and LIFO together contributed more than the reported margin expansion, while higher commercial mix and investment spending continued to create structural pressure. The stronger final eight weeks and management’s expectation for FY27 acceleration provide a fundamental reason for the positive reaction beyond relief following the stock’s recent decline. Investors will now need evidence that commercial momentum, Mega Hub investments, and newer stores can lift revenue without requiring persistent expense growth or extraordinary margin support. The key tests will be comparable-sales acceleration, new-store productivity, inventory turns, and operating-margin performance after tariff and LIFO benefits normalize.