DELAFIELD, Wis. (Stockpickr) -- Professional traders running mutual funds and hedge funds dont just look at a stocks 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.

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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 its 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.

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With that in mind, let's take a look at several stocks rising on unusual volume today.

Autobytel

Autobytel ( (ABTL) ) is an automotive marketing services company that helps automotive retail dealers and automotive manufacturers market and sell new and used vehicles through its internet referral and online advertising programs. This stock closed up 13.9% at $14.08 in Wednesdays trading session.

Wednesdays Volume: 1.07 million
Three-Month Average Volume: 166,350
Volume % Change: 442%

From a technical perspective, ABTL soared higher here and entered new 52-week-high territory after it took out some near-term overhead resistance at $13 with heavy upside volume. This stock has been uptrending strong for the last six months, with shares ripping higher from its low of $4.56 to its intraday high of $14.40. During that move, shares of ABTL have been consistently making higher lows and higher highs, which is bullish technical price action. Market players should now look for a continuation move higher in the short-term if ABTL manages to take out Wednesday's high of $14.40 with strong volume.

Traders should now look for long-biased trades in ABTL as long as its trending above Wednesday's low of $12.42 or above $12 and then once it sustains a move or close above $14.40 with volume that this near or above 166,350 shares. If we get that move soon, then ABTL will set up to enter new 52-week high territory, which is bullish technical price action. Some possible upside targets off that move are $17 to $18.

21Vianet Group

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21Vianet Group ( (VNET) - Get 21Vianet Group, Inc. Sponsored ADR Class A Report) provides carrier-neutral Internet data center services in the Peoples Republic of China. This stock closed up 6.6% to $21.85 in Wednesdays trading session.

Wednesdays Volume: 2.12 million
Three-Month Average Volume: 594,394
Volume % Change: 223%

From a technical perspective, VNET ripped higher here and broke out into new 52-week high territory above some near-term overhead resistance at $21.09 with heavy upside volume. This stock has been uptrending strong for the last month, with shares moving higher from its low of $16.27 to its intraday high of $22.28. During that move, shares of VENT have been consistently making higher lows and higher highs, which is bullish technical price action. Market players should now look for a continuation move higher in the short-term if VNET manages to take out Wednesday's high of $22.28 with high volume.

Traders should now look for long-biased trades in VNET as long as its trending above Wednesday's low of $20.14 or above its 50-day at $18.86, and then once it sustains a move or close above $22.28 with volume that hits near or above 594,394 shares. If we get that move soon, then VNET will set up to enter new 52-week high territory, which is bullish technical price action. Some possible upside targets off that move are $24 to $25.

To see more stocks rising on unusual volume, check out the Stocks Rising on Unusual Volume portfolio on Stockpickr.

-- Written by Roberto Pedone in Delafield, Wis.

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At the time of publication, author had no positions in stocks mentioned.

Roberto Pedone, based out of Delafield, Wis., is an independent trader who focuses on technical analysis for small- and large-cap stocks, options, futures, commodities and currencies. Roberto studied international business at the Milwaukee School of Engineering, and he spent a year overseas studying business in Lubeck, Germany. His work has appeared on financial outlets including CNBC.com and Forbes.com. You can follow Pedone on Twitter at www.twitter.com/zerosum24 or @zerosum24.