Sandisk stock has been the top performer in the first half of 2026, with some outlets reporting it has risen by 580%. The company's strong performance has led to speculation about its potential for the second half of the year, with some analysts suggesting it could continue to outperform. However, reports also note that the S&P 500 as a whole had a poor quarter, with some tech stocks, including possibly Sandisk, experiencing a drop to start the second half.