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 seven stocks rising on unusual volume today. They are all recording volume changes of 100% or more from their average trading volume.

>>5 Stocks to Trade for End-of-Month Gains

Sequans Communications

Sequans Communications ( SQNS) designs, develops, and supplies 4G semiconductor solutions for wireless broadband applications. The stock is trading up 1 cents, or 14.3%, at $6.46 in recent trading.

Volume: 1.8 million

Average Volume: 769,600

Volume % Change: 131.7%

Ivanhoe Mines

Ivanhoe Mines ( IVN) is an international mineral exploration and development company. The Company's main mineral resource property is the Oyu Tolgoi Project, located in Mongolia. The stocks is trading up $3.37, or 23.2%, at $17.92 in recent trading.

Volume: 5.1 million

Average Volume: 2.03 million

Volume % Change: 153.4%

Ivanhoe, one of the top holdings at John Griffin's Blue Ridge Capital, shows up on a recent list of 7 Mining Stocks to Watch.

Harleysville Group

Harleysville Group ( HGIC) is an insurance holding company, which through its subsidiaries, engages in the property and casualty insurance business on a regional basis. The stock is trading up 3 cents at $31.91 in recent trading.

Volume: 161,232

Average Volume: 54,000

Volume % Change: 198.6%

Harleysville is one of the highest-yielding insurance stocks and one of TheStreet Ratings' top-rated insurance stocks.

Philippine Long Distance Telephone

Philippine Long Distance Telephone ( PHI), through its main business segments - wireless, fixed line, and information and communications technology offers the most diversified range of telecommunications services across the Philippines. The stock was trading up $1.32, or 2.7%, at $49.70 in recent trading.

Volume: 325,794

Average Volume: 106,500

Volume % Change: 205.9%

PHI is one of TheStreet Ratings' top-rated wireless stocks.

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