Sun Healthcare Group Inc. (Nasdaq:SUNH), Linn Energy LLC. (Nasdaq:LINE) and UAL Corp. (Nasdaq:UAUA) are among the most actively traded companies in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Solarfun Power Holdings Co. Ltd. (Nasdaq:SOLF), JA Solar Holdings Co. Ltd. (Nasdaq:JASO), Canadian Solar Inc. (Nasdaq:CSIQ), DryShips Inc. (Nasdaq:DRYS), Regency Energy Partners LP (Nasdaq:RGNC) and Taser International Inc. (Nasdaq:TASR).

Here are the most actively traded companies among small caps:

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