Stock Quotes in this Article: CVGW, IMOS, MAKO, OSIS, PROJ, VVUS, SODA, SZYM

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. Many times when above average volume moves into 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.”

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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.

Let's take a look at several stocks rising on unusual volume today.

Deltek

Deltek (PROJ) is the global provider of enterprise software and information solutions for professional services firms, government contractors, and government agencies. The stock is trading up 7.2% at $11.22 in recent trading.

Today’s Volume: 185,000

Average Volume: 84,150

Volume % Change: 434%

From a technical perspective, PROJ is starting to trigger a big breakout trade today now that it’s moving above some past overhead resistance at $10.87 with decent volume.

Traders should continue to look for long biased trades in PROJ as long as it’s trending above that key breakout level of $10.87 with strong volume flows. The next significant overhead resistance level sits at $13.50, so look for the stock to re-test that soon if this breakout holds.

ChipMOS Technologies

ChipMOS Technologies (IMOS) is a provider of semiconductor testing and assembly services. The stock is trading up 12% at $11.92 in recent trading.

Today’s Volume: 296,000

Average Volume: 88,189

Volume % Change: 604%

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From a technical perspective, IMOS is trigging a big breakout trade today now that this stock is moving above some past overhead resistance at $10.13 with heavy volume. That said, IMOS is also pushing into extremely overbought territory since its current relative strength index (RSI) reading is now 87.72. Overbought can always get move overbought when the short-term momentum for any stock is this strong.

Traders should continue to look for short-term long-biased trades in IMOS as long as the stock closes near its daily highs today, and continues to trend above that breakout level of $10.13 with strong volume.
Vivus
Vivus (VVUS) is engaged in development and commercialization of therapeutic drugs for large underserved markets, including obesity and related morbidities, such as sleep apnea and diabetes and men's sexual health. The stock is trading up 10% at $24.35 in recent trading.

Today’s Volume: 17.2 million

Average Volume: 3.8 million

Volume % Change: 735%

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From a technical perspective, VVUS is gapping up big today on huge volume. This huge gap up has now pushed VVUS into extremely overbought territory since its relative strength index (RSI) reading is now 85.40. Any RSI reading over 70 is considered overbought so shares of VVUS are very overbought at this point.

That said, overbought can always get more overbought, so traders should continue to look for long biased trades if VVUS closes near its daily highs today. I would only get cautious on this stock and look for short term short biased trades if it starts to move below $22 with strong volume.

Calavo Growers

Calavo Growers (CVGW) is engaged in the marketing and distribution of avocados, prepared avocados, and other perishable foods. This stock is trading up 6.7% at $29.69 in recent trading.

Today’s Volume: 147,000

Average Volume: 68,648

Volume % Change: 316%

From a technical perspective, CVGW is starting to trigger a big breakout trade today now that this stock is moving above some near-term overhead resistance at around $28.58 on strong volume. This move today has also just pushed CVGW into all-time high territory, which is bullish price action.

Traders should continue to look for long-biased trades in CVGW as long as the stock continues to trend above that breakout level of $28.58 with strong volume.

Solazyme

Solazyme's (SZYM) technology transforms a range of plant-based sugars into oils. This stock is trading up 4.4% at $13.08 in recent trading.

Today’s Volume: 352,000

Average Volume: 305,123

Volume % Change: 148%

From a technical perspective, SZYM is now trading within range of triggering a big breakout trade since the stock is very near some key overhead resistance levels.

Traders should now watch for SZYM to sustain a high-volume move and close above $13.67 to $13.75 to signal that it wants to trend much higher. Look for volume on a breakout above those levels that’s near or well above 305,123 shares. If we get that action soon, look for SZYM to re-test its next significant overhead resistance level near $18.

Solazyme was also featured recently in "7 Undervalued IPO Stocks That Could Rebound in 2012."

OSI Systems

OSI Systems (OSIS) is a vertically integrated designer and manufacturer of specialized electronic systems and components for critical applications. This stock is trading up 9.6% at $58.73 in recent trading.

Today’s Volume: 182,000

Average Volume: 97,729

Volume % Change: 262%

Shares of OSIS are soaring today after the company announced that Mexico’s tax and customs authority has exercised contractual options under the six-year turnkey screening service agreement with OSI’s security division, Rapiscan Systems. The value of the agreement is around $900 million.

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From a technical perspective, OSIS is starting to trigger a big breakout trade today now that this stock is moving above some near-term overhead resistance at $57 to $57.51 on strong volume. This move is also pushing OSIS into 52-week-high territory, which is bullish price action.

Traders should continue to look for long biased trades in OSIS as long as this stock can manage to close above those key breakout levels and near its daily highs. If we get that action today, then look for OSIS to tag $60 to $65 in the near future.

SodaStream International

SodaStream International (SODA), along with its subsidiaries, is engaged in developing, manufacturing and marketing home beverage carbonation systems and related products. This stock is trading up 3.1% at $45.87 in recent trading.

Today’s Volume: 1.85 million

Average Volume: 1.14 million

Volume % Change: 235%

Shares of SODA are catching a bid today on strong volume in front of the company’s earnings report which is set for Wednesday before the market open.

From a technical perspective, SODA is triggering a breakout trade today now that this stock is moving above some near-term overhead resistance at $43.45 and some past overhead resistance at $44.72 with strong volume. Shares of SODA have also started to move back above its 200-day moving average of $44.35. '

Traders should continue to look for short-term long biased trades in SODA ahead their earnings report, as long as the stock is trending above $44.72 with volume.

Mako Surgical

Mako Surgical (MAKO) is a medical device company that markets its advanced robotic arm solution and orthopedic implants for orthopedic procedures. This stock is trading up 3.4% at $38.94 in recent trading.

Today’s Volume: 856,000

Average Volume: 959,261

Volume % Change: 85%

From a technical perspective, MAKO is starting to trigger a breakout trade today now that this stock is moving above some near-term overhead resistance at $37.90 and some past overhead resistance at $38.50 on decent volume.

Traders should continue to look for long biased trades in MAKO as long as this stock can manage to close above those key breakout levels and near its daily highs. If we get that action, then look for MAKO to re-test $40 to $43 in the very near future.

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

-- Written by Roberto Pedone in Winderemere, Fla.

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

Roberto Pedone, based out of Windermere, Fla., is an independent trader who focuses on stocks, options, futures, commodities and currencies. He is also an outside contributor to Beconequity.com and maintains the website Maddmoney.net, which he sold to Blue Wave Advisors in 2008. Roberto studied International Business at The Milwaukee School of Engineering, and he spent a year overseas studying business in Lubeck, Germany.