What happened: Sandisk (SNDK) stock fell 5% on Thursday. What's behind the move: The flash memory and storage manufacturer issued revenue guidance for the company's fiscal first quarter that came in below analyst expectations. The company expects its fiscal Q1 revenue to be between $10.3 billion and $10.8 billion, versus estimates of $11.16 billion. The company's forecast for adjusted earnings per share for the current quarter was between $44 and $46, versus estimates of $45.58. Sandisk posted fiscal fourth quarter revenue of $8.79 billion, beating Wall Street consensus estimates of $8.64 billion.