Stock Quotes in this Article: CSGP, RVBD, ANIP

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.

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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 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.

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

ANI Pharmaceuticals

ANI Pharmaceuticals (ANIP), an integrated specialty pharmaceutical company, develops, manufactures and markets branded and generic prescription pharmaceuticals. This stock closed up 20.6% at $30.83 in Monday's trading session.

Monday's Volume: 675,000

Three-Month Average Volume: 196,653

Volume % Change: 213%

From a technical perspective, ANIP exploded higher here back above its 50-day moving average of $29.29 with heavy upside volume. This stock recently sold off from its high of $38.74 to its low of $19.90. Following the selloff, shares of ANIP have formed a V-shaped bottom as the stock has exploded higher back above its 50-day moving average. Market players should now look for a continuation move to the upside in the short-term if ANIP manages to take out Monday's intraday high of $31.01 with strong volume.

Traders should now look for long-biased trades in ANIP as long as it's trending above $28 or above $27.50 and then once it sustains a move or close above Monday's high of $31.01 with volume that hits near or above 196,653 shares. If we get that move soon, then ANIP will set up to re-test or possibly take out its next major overhead resistance levels at $34 to $35, or even its 52-week high at $38.74.

Riverbed Technology

Riverbed Technology (RVBD) provides application performance infrastructure solutions in the U.S. and internationally. This stock closed up 3.3% at $19.50 in Monday's trading session.

Monday's Volume: 4.64 million

Three-Month Average Volume: 2.08 million

Volume % Change: 136%

From a technical perspective, RVBD spiked notably higher here right above some near-term support at $18.47 with above-average volume. This move on Monday briefly pushed shares of RVBD back above its 50-day moving average of $20.02 and above some near-term resistance at $20.43. Shares of RVBD tagged an intraday high of $20.44, before the stock closed back below those levels at $19.50. Market players should now look for a continuation move to the upside in the short-term if RVBD manages to take out Monday's high of $20.44 to more resistance at $20.50 with high volume.

Traders should now look for long-biased trades in RVBD as long as it's trending above Monday's low of $18.91 or above more support at $18.47 and then once it sustains a move or close above those breakout levels with volume that's near or above 2.08 million shares. If that move starts soon, then RVBD will set up to re-test or possibly take out its 52-week high at $22.76. Any high-volume move above that level will then give RVBD a chance to tag $25.

CoStar Group

CoStar Group (CSGP), provides information, analytics and marketing services to the commercial real estate industry in the U.S., the U.K. and France. This stock closed up 3.8% at $171.97 in Monday's trading session.

Monday's Volume: 339,000

Three-Month Average Volume: 207,923

Volume % Change: 76%

From a technical perspective, CSGP spiked notably higher here off $165 with above-average volume. This move on Monday briefly pushed shares of CSGP back above its 200-day moving average of $173.11. Shares of CSGP tagged an intraday high of $173.91, before the stock closed below its 200-day at $171.97. This stock is now starting to trend within range of triggering a major breakout trade. That trade will hit if CSGP manages to take out Monday's high of $173.91 to some more near-term overhead resistance at $176 with high volume.

Traders should now look for long-biased trades in CSGP as long as it's trending above Monday's low of $165.39 or above more near-term support at $160 and then once it sustains a move or close above those breakout levels with volume that's near or above 207,923 shares. If that breakout gets underway soon, then CSGP will set up to re-test or possibly take out its next major overhead resistance levels at its 50-day moving average of $189.72 to $193.37, or $195.

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.