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 With Major Insider Buying 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. >>5 Stocks Ready to BreakOut Trulia Trulia ( TRLA), which operates as a real estate search engine, closed up 4.7% at $32.01 on Wednesday. Wednesday's Volume: 957,000 Average Volume: 426,505 Volume % Change: 163% From a technical perspective, TRLA bounced higher here right above some near-term support at $29.67 with above-average volume. This stock has been uptrending strong for the last month, with shares moving higher from its low of $23.08 to its recent high of $32.40. During that move, shares of TRLA have been consistently making higher lows and higher highs, which is bullish technical price action. That move has now pushed shares of TRLA within range of triggering a near-term breakout trade. That trade will hit if TRLA manages to take out some near-term overhead resistance at $32.40 with high volume. Traders should now look for long-biased trades in TRLA as long as it's trending above some near-term support at $29.67 or $28.83 and then once it sustains a move or close above $32.40 with volume that hits near or above 426,505 shares. If that breakout triggers soon, then TRLA will set up to re-test or possibly take out its next major overhead resistance levels at $34 to its 52-week high at $38.22.