Here's a look at stocks in the S&P 1,500 index displaying unusual volume in Wednesday's trading session.
S&P 500: Trading volume in CA is up 300 percent over its 10-day average, after the business-software maker raised its annual dividend fivefold to $1 per share.
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S&P MidCap 400: Rock Tenn volume jumped 250 percent over its 10-day average, as the manufacturer of packaging products reported first-quarter-earnings below expectations.
S&P SmallCap 600: Piper Jaffray volume rose nearly 400 percent over its 10-day average, following a dissapointing earnings report from the investment bank.
