MADISON, 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.Major moves in volume can signal unusual activity, such as insider buying or selling -- or buying or selling by "superinvestors." >>5 Stocks Insiders Love Right Now 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 Rocket Stocks to Buy This Week Shutterfly Shutterfly ( SFLY) is an Internet-based social expression and personal publishing service that enables consumers to share, print and preserve their memories by leveraging its technology, manufacturing, Web-design and merchandising capabilities. This stock is trading up 3.3% at $49.10 in recent trading. Today's Volume: 2.82 million
Average Volume: 699,002
Volume % Change: 639% Shares of SFLY are ripping higher here after the company announced the pricing of a $270 million convertible senior note offering. >>5 Stocks Poised to Break Out From a technical perspective, SFLY is trending higher here with heavy upside volume. This move is quickly pushing shares of SFLY within range of triggering a major breakout trade, which will hit if SFY manages to take out some near-term overhead resistance at $49 with high volume. At last check, SFLY has hit an intraday high of $49.52, and volume is well above its three-month average action of 699,002 shares. Traders should now look for long-biased trades in SFLY as long as it's trending above $48 and then once it sustains a move or close above $49 to $49.53 with volume that hits near or above 699,002 shares. If SFLY can maintain this move, then this stock will set up to re-test or possibly take out its next major overhead resistance levels at $55 to $60.