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. Mazor Robotics Mazor Robotics ( MZOR) develops and markets surgical robots and complementing products for patients, surgeons and OR staff. This stock closed up 8.4% to $15.56 in Friday's trading session. Friday's Volume: 306,000
Three-Month Average Volume: 88,387
Volume % Change: 268% >>5 Big Trades You Can't Miss From a technical perspective, MZOR soared to the upside here and broke out above some near-term overhead resistance levels at $14.66 to $15 and above to its all-time high at $15.32 with heavy upside volume. This stock closed strong with shares ending the trading session above all those breakout levels and near its new all-time high of $16.08. Traders should now look for long-biased trades in MZOR as long as it's trending above $14.66 or Friday's low of $14.30 and then once it sustains a move or close above its new all-time high at $16.08 with volume that hits near or above 88,387 shares. If we get that move soon, then MZOR will set up to enter new all-time-high territory, which is bullish technical price action. Some possible upside targets off that move are $20 to $23. CenturyLink CenturyLink ( CTL) is engaged primarily in providing a broad array of communications services including local and long distance voice, data, Internet access and broadband services. This stock closed up 2.2% to $33.30 in Friday's trading session.