By Hannah Pedone and Emily Bary

Micron's massive growth is 'coming at nearly pure profit,' and that's starting to have real implications for the S&P 500

Micron reports earnings after Wednesday's closing bell.

The end of June once marked a virtual dead period for noteworthy corporate earnings, as key companies had delivered their quarterly results weeks or months before.

Now Wall Street has something to pay attention to. Micron Technology (MU) has become a stock-market darling over the past year, and as the company and its profit pool have exploded in size, Micron's results are increasingly relevant to the S&P 500 SPX. The company is due to post its financials on Wednesday afternoon.