Omnicell, Inc. (Nasdaq:OMCL), Zoran Corp. (Nasdaq:ZRAN) and TomoTherapy Inc. (Nasdaq:TOMO) are among the most actively traded companies in Tuesday's pre-market trading among those with market capitalizations under $750 million.

Aladdin Knowledge Systems Ltd. (Nasdaq:ALDN), Volterra Semiconductor Corp. (Nasdaq:VLTR) and AgFeed Industries, Inc. (Nasdaq:FEED) are also among the most actively traded small-cap companies in pre-market trading.

Here are the most actively traded small-cap companies in Tuesday's pre-market trading:

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