Park-Ohio Holdings, Keynote Systems and ATC Technology lead small-cap percentage gainers

Park-Ohio Holdings Corp. (Nasdaq:PKOH), Keynote Systems Inc. (Nasdaq:KEYN) and ATC Technology Corp. (Nasdaq:ATAC) are among the biggest percentage gainers in Wednesday's trading among companies with market capitalizations under $1 billion.

Also included among the results: WellCare Health Plans Inc. (Nasdaq:WCG), Stratasys Inc. (Nasdaq:SSYS), Arctic Cat Inc. (Nasdaq:ACAT), ViroPharma Inc. (Nasdaq:VPHM), Wintrust Financial Corp. (Nasdaq:WTFC) and Given Imaging Ltd. (Nasdaq:GIVN).

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