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 GainsSequans CommunicationsSequans 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 MinesIvanhoe 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 GroupHarleysville 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 TelephonePhilippine 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.