DELAFIELD, Wis. ( 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.>>5 Hated Earnings Stocks You Should Love Major moves in volume can signal unusual activity, such as insider buying or selling -- or buying or selling by "superinvestors." 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. >>5 Stocks Poised for Breakouts With that in mind, let's take a look at several stocks rising on unusual volume today. GT Advanced Technologies GT Advanced Technologies ( GTAT) is a technology company with innovative crystal growth equipment and solutions for solar, LED and electronics industries. This stock closed up 8.1% at $10.24 in Monday's trading session. Monday's Volume: 8.78 million
Three-Month Average Volume: 5.12 million
Volume % Change: 195% >>5 Breakout Trades Under $10 From a technical perspective, GTAT spiked sharply higher here right above some near-term support at $9.14 with heavy upside volume. This stock has been uptrending strong for the last four months, with shares skyrocketing higher from its low of $3.44 to its recent high of $10.60. During that uptrend, shares of GTAT have been consistently making higher lows and higher highs, which is bullish technical price action. That move has now pushed shares of GTAT within range of triggering a near-term breakout trade. That trade will hit if GTAT manages to take out Monday's high of $10.35 to its 52-week high at $10.60 with high volume. Traders should now look for long-biased trades in GTAT as long as it's trending above some near-term support at $9.14 or above its 50-day at $8.15 and then once it sustains a move or close above those breakout levels with volume that's near or above 5.12 million shares. If that breakout hits soon, then GTAT will set up to enter new 52-week-high territory, which is bullish technical price action. Some possible upside targets off that breakout are $13 to $16.