https://www.cnbc.com/2019/01/14/chipmaker-western-digital-falls-after-evercore-isi-downgrade.html

Shares of data storage company Western Digital fell more than 4 percent in the premarket Monday after an analyst at Evercore ISI said the market has not fully price the competitive hurdles the company faces.

"The current competitive positioning for WDC is not ideal as we estimate WDC's enterprise SSD (solid state drivers) share has roughly halved in the last few years to ~12%," analyst C.J. Muse wrote in a note Monday. "Moving forward, strong positioning in NVMe will be critical and here we fear WDC will continue to lag."