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 "Magic Formula" Stocks for 2013 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. >>Outwit the S&P in 2013 With 5 Hated Stocks With that in mind, let's take a look at several stocks rising on unusual volume today. Magnachip Semiconductor ( MX) This company is a designer and manufacturer of analog and mixed-signal semiconductor products for consumer applications. This stock is trading up 5.8% at $14.07 in recent trading. Today's Volume: 550,000 Average Volume: 130,929 Volume % Change: 391% From a technical perspective, MX is ripping higher here right above some near-term support at $12.99 with monster upside volume. This stock has been uptrending strongly for the last two months, with shares soaring from a low of $10.85 to its recent high of $14.28. During that move, shares of MX have been mostly making higher lows and higher highs, which is bullish technical price action. That move has now pushed MX within range of triggering a major breakout trade. That trade will hit once MX clears some near-term overhead resistance levels at $14 to $14.42 with high volume. Traders should now look for long-biased trades in MX as long as it's trending above its $12.99, and then once it sustains a move or close above those breakout levels with volume that hits near or above 130,929 shares. If that breakout hits soon, then MX will set up to enter new 52-week high territory, which is bullish technical price action. Some possible upside targets off that breakout are 15 to its all-time high of $15.56.