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 Ready to Break Out 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 Stocks Under $10 Set to Soar With that in mind, let's take a look at several stocks rising on unusual volume today. ChipMOS Technologies ChipMOS Technologies ( IMOS) is a provider of semiconductor testing and assembly services. This stock closed up 6.5% at $17.33 in Friday's trading session. Friday's Volume: 453,000
Three-Month Average Volume: 337,888
Volume % Change: 85% >>5 Stocks Warren Buffett Is Buying in 2013 From a technical perspective, IMOS jumped sharply higher here right above some near-term support at $15.85 with decent upside volume. This move is quickly pushing shares of IMOS within range of triggering a major breakout trade. That trade will hit if IMOS manages to take out some near-term overhead resistance levels at its 50-day moving average of $17.48 to more resistance at $17.84 with high volume. Traders should now look for long-biased trades in IMOS as long as it's trending above some key near-term support levels at $15.85 or $15 and then once it sustains a move or close above those breakout levels with volume that's near or above 337,888 shares. If that breakout triggers soon, then IMOS will set up to re-test or possibly take out its next major overhead resistance levels at $19.28 to its 52-week high at $20.69. Natural Grocers by Vitamin Cottage Natural Grocers by Vitamin Cottage ( NGVC) is a specialty retailer of natural and organic groceries and dietary supplements. This stock closed up 6.6% at $37.66 in Friday's trading session.