Today's biggest winners and losers in the stock market.

On this episode of Stock Movers:

-Super Micro Computer (SMCI) shares shares plunged after the U.S. government charged a co-founder of the company and two other individuals with involvement in a plan to divert U.S.-assembled servers to China in a violation of export-control laws.

-Dell (DELL) stocks rose after the Justice Department charged three individuals associated with Super Micro Computer, Dell's arch-rival, for allegedly skirting export-control laws by diverting $2.5 billion worth of U.S.-assembled servers to China.

- ARM Holdings ADRs are up 2% in premarket trading, after HSBC upgraded the chip-design company to buy from reduce.