Royale Energy, SuccessFactors and Advanced Battery Technologies lead small-cap volume in pre-market

Royale Energy Inc (Nasdaq:ROYL), SuccessFactors Inc (Nasdaq:SFSF) and Advanced Battery Technologies Inc (Nasdaq:ABAT) are among the most actively traded companies in Tuesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: UAL Corp (Nasdaq:UAUA), Ameristar Casinos Inc (Nasdaq:ASCA), China Precision Steel Inc (Nasdaq:CPSL), China Sunergy Co Ltd (Nasdaq:CSUN), National Coal Corp (Nasdaq:NCOC) and Akeena Solar Inc (Nasdaq:AKNS).

Here are the most actively traded companies among small caps:

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