MADISON, 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.Major moves in volume can signal unusual activity, such as insider buying or selling -- or buying or selling by "superinvestors." >>3 Huge Stocks on Traders' Radars 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 Poised for Big Breakouts SunPower SunPower ( SPWR) is a vertically integrated solar products and services company that designs, manufactures and delivers high-performance solar electric systems worldwide for residential, commercial and utility-scale power plant customers. This stock is trading up 11.3% at $13.54 in recent trading. Today's Volume: 6.85 million
Average Volume: 4.27 million
Volume % Change: 152% >>4 Big Tech Stocks to Trade (or Not) From a technical perspective, SPWR is exploding higher here and breaking out above some near-term overhead resistance at $12.95 with heavy upside volume. This move is quickly pushing SPWR within range of triggering another major breakout trade. That trade will hit if SPWR manages to clear its 52-week high at $13.90 with high volume. Traders should now look for long-biased trades in SPWR as long as it's trending above $12.95 or today's low at $12.70 and then once it sustains a move or close above its 52-weeek high at $13.90 with volume that hits near or above 4.27 million shares. If that breakout triggers soon, then SPWR will set up to enter new 52-week-high territory, which is bullish technical price action. Some possible upside targets off that move are $16 to $18. J.C. Penney J.C. Penney ( JCP) sells merchandise and services to consumers through its department stores and direct channels. It offers such products as family apparel and footwear, accessories, and fine and fashion jewelry. This stock is trading up 9.3% at $16.67 in recent trading.