Costco's September 24 earnings call for fiscal Q4 2026 represents the key near-term catalyst, with analysts forecasting 10% revenue growth to roughly $94.85 billion and 12% EPS expansion to $6.55, building on Q3 momentum. Traders are focused on updates around digitally-enabled comparable sales, which surged 21.5% in the prior quarter driven by e-commerce traffic and same-day delivery expansions, alongside membership renewal rates near 90% and warehouse growth plans. Cost pressures from tariffs, fuel, and supply chains remain swing factors that could shape forward guidance, while partnerships like expanded delivery integrations highlight ongoing platform and logistics enhancements. Recent sales results and analyst notes on potential misses excluding one-time items add uncertainty to sentiment around core operating trends.