These are the top pre-market movers for day traders, active traders, and swing traders seen early this Wednesday.  We have compiled more detailed data and analysis with a link to each story over at VSInvestor.com:

China BAK Battery, Inc. (NASDAQ: CBAK) is giving back much of yesterday’s gains.

Compugen Ltd. (NASDAQ: CGEN) is up on its offering news as the weighted average price ended up being above the current market price.

OSI Systems, Inc. (NASDAQ: OSIS) is trying to make this a 3-day run on airport security system hopes.

Fannie Mae (NYSE: FNM) and Freddie Mac (NYSE: FRE) are both lower after yesterday’s early gains failed to stay in positive territory.

Dish Network Corp. (NASDAQ: DISH) has seen two major block trades of 4 million shares each.

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JON C. OGG