NEW YORK ( Stockpickr) -- Professional traders don't just look at a stock's price moves; they also look for big changes in volume.

Major moves in volume can signal unusual activity, such as insider buying or selling -- or buying or selling by "superinvestors."

Let's take a look at several stocks rising on unusual volume today. They are all recording volume today that is already 100% or more above their average daily trading volume.

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Sally Beauty Holdings ( SBH) and its subsidiaries sell professional beauty supplies through Sally Beauty Supply retail stores and distribute professional beauty products to salons and professional cosmetologists through the Beauty Systems Group. The stock is trading 73 cents, or 4.3%, at $17.69 in recent trading.

Volume: 7.5 million

Average Volume: 876,000

Volume % Change: 754%

On Wednesday, Sally Beauty Holdings announced that investment funds associated with Clayton, Dubilier & Rice have increased the size of a previously announced underwritten public offering of SBH stock, from 15 million shares to 18 million shares. The offering is priced at $16.75 per share.

Winnebago ( WGO) is a manufacturer of self-contained recreation vehicles used mainly in leisure travel and outdoor recreation activities. The stock is trading up 2 cents at $7.67 in recent trading.

Volume: 1.3 million

Average Volume: 332,900

Volume % Change: 278.8%

On Thursday, Winnebago reported that fourth-quarter earnings fell 28% to 12 cents per share, but they still managed to beat Wall Street estimates for 4 cents per share.

One of TheStreet Ratings' top-rated automobile stocks, Winnebago was featured this week in " 5 Earnings Stocks to Squeeze the Bears."

Volcano ( VOLC) designs, develops, manufactures and commercializes a suite of intravascular ultrasound and functional measurement products that enhance the diagnosis and treatment of vascular and structural heart disease. The stock is trading up 50 cents, or 2%, at $25.82 in recent trading.

Volume: 1.4 million

Average Volume: 580,000

Volume % Change: 134.4%

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