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.>>Trade 5 Hated Names to Beat the Market 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 Trades to Take After the "Obama Crash" With that in mind, let's take a look at several stocks rising on unusual volume today. FleetCor Technologies ( FLT) This is an independent global provider of specialized payment products and services to businesses, commercial fleets, oil companies, petroleum marketers and government entities in countries throughout North America, Latin America and Europe. This stock is trading up 2.6% at $47.29 in recent trading. Today's Volume: 1.05 million Average Volume: 407,105 Volume % Change: 384% Shares of FLT are trending higher today after Citigroup upgraded the stock citing the company's strong third quarter results and forward prospects. The firm raised its price target to $56 from $49. From a technical perspective, FLT is bouncing higher here right off some near-term support at $47 with above-average volume. This move has started to push FLT into breakout territory, since the stock has challenged some near-term overhead resistance at $47.97. At last check, FLT has hit an intraday high of $49.49 and volume is well above its three-month average action of 407,105 shares. Traders should now look for long-biased trades in FLT as long as it's trending above $47.97 with strong upside volume flows. I would consider any upside volume day that registers near or above 407,105 shares as bullish. If FLT can maintain that trend, then look for the stock to challenge and possible take out today's high of $49.49. Some possible upside targets if $49.49 gets taken out with volume are $53 to $55.