Notable Stock Downgrades (THOR, ACIW, APWR, Micron)

Thoratec Corporation (NASDAQ:THOR) plunged 19.23% to $25. UBS downgraded Thoratec from Buy to Neutral.   

The stock opened at $25.54 and is trading within the range of $24.50-$26. At current market price, the market capitalization of the company stands at $1.46 billion.

ACI Worldwide Inc (NASDAQ:ACIW) went down 3.44% to $25.25. Raymond James downgraded ACI Worldwide (NASDAQ: ACIW) to a Market Perform rating from its previous rating of Outperform.

Over the past three months, the stock went up more than 26%.

A-Power Energy Generation Systems, Ltd. (NASDAQ:APWR) lost 1.13% to $7.09. Raymond James downgraded A-Power Energy Generation Systems, Ltd. to a Market Perform rating from its previous rating of Outperform.

At current market price, the market capitalization of the company stands at $321.58 million.

Micron Technology, Inc. (NASDAQ:MU) dropped 1.62% to $7.59. Lazard Capital downgraded Micron Technology to a Hold rating from its previous of Buy.

The stock opened at $7.65 and is trading within the range of $7.53-$7.66. At current market price, the market capitalization of the company stands at $7.56 billion.