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Casey’s General Stores (CASY) led the S&P 500 lower, dropping sharply by around 15% to 18% in a single session, following the release of its quarterly financial results.Despite reporting headline figures that topped Wall Street estimatesdelivering diluted earnings per share of $7.37 (above the expected $6.68) and revenue of $5.68 billionseveral underlying factors triggered the steep sell-off:

1. Cash Flow and High Capital Expenditures: Free cash flow dropped significantly to $190 million from $262 million in the prior-year period. Elevated capital expenditures offset operating cash flow, sparking concerns about near-term cash generation.
2. Rising Operating Expenses and Integration Pressures: Operating expenses jumped roughly 8% year-over-year. In addition, management pointed out that integrating acquisitions (such as CEFCO stores) was causing more disruption than anticipated, requiring multi-week store remodels.
3. Margin Volatility and Category Weakness: Investors grew cautious over wild fluctuations in fuel margins (ranging between 30 and 60 cents per gallon daily) and soft sales trends in discretionary categories such as beer, cigarettes, and snacks, indicating budget pressure among lower-income consumers.
4. Stretched Valuation: Prior to the earnings release, the stock had experienced a massive run-up, trading at historically high multiples (a price-to-earnings ratio near 38x–39x). Because shares were priced for perfection, the combination of rising expenses, cash flow compression, and conservative guidance prompted investors to aggressively take profits.