Ambac Financial Group (Nasdaq:AKT), United Community Bancorp (Nasdaq:UCBA) and Universal Stainless & Alloy Products Inc. (Nasdaq:USAP) are among the biggest percentage gainers in Friday's trading among companies with market capitalizations under $1 billion.

Also included among the results: GT Solar International Inc. (Nasdaq:SOLR), Gladstone Commerical REIT (Nasdaq:GOOD), Logility Inc. (Nasdaq:LGTY), ICU Medical Inc. (Nasdaq:ICUI), Rochester Medical Corp. (Nasdaq:ROCM) and Switch & Data Facilities Co Inc. (Nasdaq:SDXC).

Here are the biggest percentage gainers among small caps:

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