Ross Stores’ upcoming May 21 earnings release is the dominant catalyst setting the tight 45–49% probability range across comparable-store-sales growth brackets. The off-price retailer guided to 7–8% Q1 comp growth—well above last year’s flat result—on the back of a 9% Q4 beat driven by higher traffic and transaction volumes. Traders appear to weigh this guidance against potential headwinds including tariff pressure on China-sourced inventory and softening consumer sentiment, while noting the company’s strong competitive position in value retail. With consensus EPS at $1.65 and full-year comps targeted at 3–4%, market-implied odds reflect uncertainty over whether recent momentum will hold or moderate toward the lower end of expectations.