Micron stock (MU) is long from $21.77. Micron stock is trading at $49.76 as of this writing and very volatile.
MU manufactures DRAM and Flash memory. MU is an American company doing a lot of its manufacturing in the state of Idaho. Its primary competitors are Asian companies such as Samsung. The stock is moving up as it may be a beneficiary of a trade war.
What To Do Now
Those in the stock may consider continuing to hold.
Those not in the stock may want to understand that the stock is likely to get whipsawed based on rumors and tweets.