Walmart now sees net sales rising 3.75% to 4.75% from last year, compared to prior guidance for a range of 3% to 4%. Walmart also tweaked its earnings forecast, saying it now expects adjusted earnings per share to range from $2.52 to $2.62. The previous outlook was for $2.50 to $2.60.

The $100 level acted as support earlier in August. But since February, $100 has been a pretty strong resistance level. Now that WMT stock is below it once more, it is a worrying sign. Shares of Walmart rarely go on sale unless the market perceives a macro shock.