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.

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.

Follow Giovanny Moreano on Twitter: @giovannymoreano

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RKT News & Analysis

 BRIEF-Rocktenn increases annual dividend to $1.20 per share - 26 Apr 2013 EDT

 RESEARCH ALERT-Rock Tenn-: Barclays raises price target - 26 Apr 2013 EDT

 RESEARCH ALERT-Rock Tenn: TD Securities raises target price - 25 Apr 2013 EDT

 RESEARCH ALERT-Rock Tenn-: Jefferies raises price target - 25 Apr 2013 EDT

 MARKET PULSE-Boeing, AT&T, P&G, Apple, Corning, Boyd, First Solar - 24 Apr 2013 EDT

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