Polypore International Inc. (Nasdaq:PPO), Iris International Inc. (Nasdaq:IRIS) and Sauer Danfoss Inc. (Nasdaq:SHS) are among the biggest percentage losers in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: OSI Systems Inc. (Nasdaq:OSIS), Natus Medical Inc. (Nasdaq:BABY), RGC Resources Inc. (Nasdaq:RGCO), VNUS Medical Technologies Inc. (Nasdaq:VNUS), Littelfuse Inc. (Nasdaq:LFUS) and Protective Life Corp. (Nasdaq:PL).

Here are the biggest percentage losers among small caps:

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