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.>>5 Dividend Stocks Itching to Pay You More 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. With that in mind, let's take a look at several stocks rising on unusual volume today. >>5 Stocks Insiders Are Snapping Up Deckers Outdoor ( DECK) This is a designer, producer, marketer, and brand manager of innovative, high-quality footwear and accessories. This stock is trading up 5.3% at $34.86 in recent trading. Today's Volume: 2.64 million Average Volume: 2.05 million Volume % Change: 91% Shares of DECK are moving higher today after Jefferies Group said the stock is less expensive for acquirers with shares down by 56% so far in 2012. From a technical perspective, DECK is gapping higher here right off some previous support at $32.80 with above-average volume. This move is quickly pushing DECK within range of triggering a near-term breakout trade. That trade will hit once DECK manages to take out some near-term overhead resistance levels at $35.37 to its 50-day at $35.65 with high volume. At last check, DECK has hit an intraday high of $35.79 and volume is easily above its three-month average volume of 2.05 million shares. Traders should now look for long-biased trades in DECK as long as it's trending above $35.37 to $35.65 with strong upside volume flows. I would consider any upside volume day that registers near or above 2.05 million shares as bullish. If DECK can maintain a trend above those levels, then this stock will set up to re-test or possibly take out its next major overhead resistance level at $39.44. Any high-volume move above $39.44 will then put $42.50 to $45 into focus for shares of DECK.