WINDERMERE, Fla. ( Stockpickr) -- Professional traders running mutual funds and hedge funds don't just look at a stock's price moves; they also track big changes in volume activity. Often when above-average volume moves into an equity, it precedes a large spike in volatility.Major moves in volume can signal unusual activity, such as insider buying or selling -- or buying or selling by "superinvestors." >>5 Stocks Poised for Breakouts Unusual volume can also be a major signal that hedge funds and momentum traders are piling into a stock ahead of a catalyst. These types of traders like to get in well before a large spike, so it's always a smart move to monitor unusual volume. That said, remember to combine trend and price action with unusual volume. Put them all together to help you decipher the next big trend for any stock. With that in mind, let's take a look at several stocks rising on unusual volume today. >>4 Big Stocks to Buy in February -- and One to Sell Bally Technologies Diversified gaming company Bally Technologies ( BYI) is trading up 1.7% at $49.02 in recent trading. Today's Volume: 1.06 million Average Volume: 510,815 Volume % Change: 216% Shares of BYI are soaring higher today after the company said its second quarter net income jumped 37%, and it raised its expectations for the rest of the year. From a technical perspective, BYI is bouncing strongly to the upside here right off its 50-day moving average of $45.98 and its 200-day moving average of $46.16 with above-average volume. This move has started to push shares of BYI into breakout territory, since the stock has cleared some near-term overhead resistance at $48.06. Shares of BYI are now quickly moving within range of triggering another near-term breakout trade. That trade will hit if BYI manages to take out its 52-week high of $51.16 with high volume. Traders should now look for long-biased trades in BYI as long as it's trending above that near-term breakout level of $48.06, and then once it sustains a move or close above $51.16 with volume that hits near or above 510,815 shares. If that breakout triggers soon, then BYI will have a great chance of tagging $55 or higher in the near future.