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 Stocks Poised for Breakouts 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 Stock Charts You Need to See With that in mind, let's take a look at several stocks rising on unusual volume today. Stratasys Stratasys ( SSYS) is a global provider of additive manufacturing solutions for the creation of parts used in the processes of designing and manufacturing products and for the direct manufacture of end parts. This stock is trading up 5.7% at $89.11 in recent trading. Today's Volume: 857,000
Average Volume: 700,684
Volume % Change: 69% >>Invest in Venture Capital's 5 Favorite Stocks From a technical perspective, SSYS is ripping higher here right above its 50-day moving average at $83.69 and breaking out above some near-term overhead resistance at $87.99 with above-average volume. This move is quickly pushing shares of SSYS within range of triggering another major breakout trade. That trade will hit if SSYS manages to take out some near-term overhead resistance levels at $90.50 to $92.90 and then once it clears its all-time high at $94.90 with high volume. Traders should now look for long-biased trades in SSYS as long as it's trending above $87.50, and then once it sustains a move or close above those breakout levels with volume that hits near or above 700,684 shares. If that breakout triggers soon, then SSYS will set up to enter new all-time high territory, which is bullish technical price action. Some possible upside targets off that breakout are $100 to $110.