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 already recording trading volume that is significantly above their average trading volume for a full day.

>>7 Stocks Hitting New 52-Week Highs

Brigham Exploration ( BEXP) is an exploration, development and production company that utilizes advanced exploration, drilling and completion technologies to systematically explore for, develop and produce domestic onshore oil and natural gas reserves. The stocks is up $6.02, or 19.8%, at $36.38 in recent trading.

Volume: 49.6 million

Average Volume: 3 million

Volume % Change: 1,566.7%

Ratings: Of 22 analysts covering the stock, 16 rate it a buy, and six rate it a hold. TheStreet Ratings has a B- buy rating on Brigham Exploration.

Statoil ( STO) agreed Monday to buy Brigham for $36.50 a share in cash.

Kinder Morgan ( KMI) owns and operates energy infrastructure in the U.S. and Canada. . The stocks is trading up $1.92, or 7.1%, at $28.81 in recent trading.

Volume: 8.4 million

Average Volume: 1.2 million

Volume % Change: 577.8%

Ratings: Of seven analysts covering the stock, five rate it a buy, and two rate it a hold.

Kinder Morgan has agreed to buy El Paso ( EP) for $21.1 billion in cash and stock.

Shanda Interactive Entertainment ( SNDA) is an interactive entertainment media company, offering an array of online entertainment content on an integrated service platform to a large and diverse user base. The stocks is up $5.97, or 17.8%, at $39.45 in recent trading.

Volume: 598,685

Average Volume: 160,000

Volume % Change: 274.2%

Ratings: Of 10 analysts covering the stock, three rate it a buy, five rate it a hold, and two rate it a sell. TheStreet Ratings has a C hold rating on Shanda.

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