Costco's upcoming Q4 2026 earnings call on September 24 is likely to center on its robust 11.3% net sales growth to $93.9 billion for the quarter and 10.2% full-year rise to $297.3 billion, fueled by 17.9% digitally enabled comparable sales gains and strong membership trends. Traders are watching for mentions of tariffs, inflation, labor costs, and expansion amid analyst concerns over potential misses from higher fuel and supply expenses, despite expectations for $94.85 billion revenue and $6.55 EPS. Recent partnerships expanding digital reach, such as with delivery platforms, and historical patterns of discussing dividends, Kirkland Signature items, and holiday spending add context to probable topics. Competitive retail dynamics and warehouse growth plans could also surface as key themes.