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.Major moves in volume can signal unusual activity, such as insider buying or selling -- or buying or selling by "superinvestors." >>5 Stocks Under $10 Triggering Breakouts 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 Big Stock Charts You Need to See LifeLock LifeLock ( LOCK) is a provider of proactive identity theft protection services for consumers and identity risk assessment and fraud protection services for enterprises. This stock is trading up 4.8% at $10.80 in recent trading. Today's Volume: 623,000 Average Volume: 193,021 Volume % Change: 453% Shares of LOCK are trending higher here after the company reported record quarterly revenue of $78.8 million, up 49% year over year, and fourth-quarter cumulative ending memberships of around 2.5 million, up 20% year over year. From a technical perspective, LOCK is ripping higher here right above some near-term support at $10 with heavy upside volume. This move has pushed shares of LOCK into all-time high territory, which is bullish technical price action. Traders should now look for long-biased trades in LOCK as long as it's trending above some key near-term support levels at $10.50 to $10 with strong upside volume flows. I would consider any upside volume day that registers near or above its three-month average action of 193,021 shares as bullish. If LOCK can maintain that trend, then this stock will set up to take out its all-time high at $11.31. Some possible upside targets if $11.31 is taken out are $12 to $13 in the near future.