The following are some of the top stocks to watch for active trading today based on pre-market and after-hours volume activity. There are links through to more detailed coverage and volume analysis at VSInvestor.com:

Aetna Inc. (NYSE: AET) shares are down sharply on earnings affected by significantly higher commercial medical costs.

Corning Inc. (NYSE: GLW) shares are down on disappointing expectations for glass shipments.

Thomson (Nasdaq: TMS) shares are rising after the French media and technology firm said agreed to a debt restructuring with its creditors.

Yingli Green Energy Holding Co. (NYSE: YGE) shares are up on comments by CNBC’s Jim Cramer on his “Mad Money” show.

Cal-Maine Foods Inc. (Nasdaq: CALM) are down sharply in the premarket after a big earnings miss.

Alpha Natural Resources Inc. (NYSE: ANR) sees some early signs of a market turnaround, but are falling after missing EPS by 16 cents.

-The 24/7 Wall St. Team