Stock Quotes in this Article: IMOS, NICE, NVDA, PWRD, YNDX

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 today.

Nice Systems

Nice Systems (NICE) provides software solutions that deliver insights by capturing and analyzing mass quantities of structured and unstructured data in real time from multiple sources such as interactions, transactions and surveillance. This stock closed up 2.1% to $38 in Wednesday's trading session.

Wednesday's Volume: 430,000

Three-Month Average Volume: 135,436

Volume % Change: 218%

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From a technical perspective, NICE trended modestly higher here back above its 50-day moving average of $37.69 with heavy upside volume. This move is quickly pushing shares of NICE within range of triggering a big breakout trade. That trade will hit if NICE manages to take out some near-term overhead resistance at $38.90 to its three-year high at $39.89 with high volume.

Traders should now look for long-biased trades in NICE as long as it's trending above its 50-day at $37.69 or above Wednesday's low of $36.91, and then once it sustains a move or close above those breakout levels with volume that hits near or above 135,436 shares. If that breakout hits soon, then NICE will set up to enter new three-year high territory, which is bullish technical price action. Some possible upside targets off that move are $43 to $45.

ChipMOS Technologies

ChipMOS Technologies (IMOS) is a provider of semiconductor testing and assembly services. This stock closed up 7.9% at $17.35 in Wednesday's trading session.

Wednesday's Volume: 833,000

Three-Month Average Volume: 360,288

Volume % Change: 153%

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From a technical perspective, IMOS soared higher here and broke out above some near-term overhead resistance at $16.36 with strong upside volume. This stock recently put in a double bottom chart pattern at $14.93 to $15.10. Following that bottom, shares of IMOS have spiked sharply higher and the stock is now approaching its 50-day moving average at $17.75. At last check, shares of IMOS hit an intraday high on Wednesday of $17.63 and volume was well above its three-month average action of 360,288 shares.

Traders should now look for long-biased trades in IMOS as long as it's trending above $16 and then once it sustains a move or close above Wednesday's high of $17.63 to its 50-day at $17.75 with volume that hits near or above 360,288 shares. If we get that move soon, then IMOS will set up to re-test or possibly take out its next major overhead resistance levels at $19.28 to its 52-week high at $20.69.

Nvidia

Nvidia (NVDA) is engaged in creating the graphics chips used in personal computers that bring games and home movies to life. This stock closed up 4.2% to $15.03 in Wednesday's trading session.

Wednesday's Volume: 19.19 million

Three-Month Average Volume: 8.58 million

Volume % Change: 145%

Shares of NVDA popped higher on Wednesday after the company reported modest revenue growth of less than 3%, while adjusted EPS rose 23%.

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From a technical perspective, NVDA spiked sharply higher here right off its 50-day moving average of $14.39 with heavy upside volume. This move pushed shares of NVDA into breakout territory, since the stock out some near-term overhead resistance at $14.88. Shares of NVDA are now starting to move within range of triggering another near-term breakout trade. That trade will hit if NVDA manages to take out its 52-week high at $15.48 with high volume.

Traders should now look for long-biased trades in NVDA as long as it's trending above that first breakout level of $14.88 or above its 50-day at $14.39, and then once it sustains a move or close above its 52-week high at $15.48 with volume that hits near or above 8.58 million shares. If that breakout triggers soon, then NVDA will set up to enter new 52-week-high territory, which is bullish technical price action. Some possible upside targets off that breakout are its next major overhead resistance levels at $16.60 to $18.

Yandex

Yandex (YNDX) is an Internet company that offers access to its search engine through personal computers, mobile phones, tablets and navigation and other digital devices. This stock closed up 1.5% at $33.70 in Wednesday's trading session.

Wednesday's Volume: 3.40 million

Three-Month Average Volume: 2.46 million

Volume % Change: 80%

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From a technical perspective, YNDX spiked modestly higher here into new 52-week high territory with decent upside volume. This stock has been uptrending strong for the last three months and change, with shares soaring higher from its low of $19.93 to its intraday high of $34.79. During that move, shares of YNDX have been making mostly higher lows and higher highs, which is bullish technical price action.

Traders should now look for long-biased trades in YNDX as long as it's trending above some key near-term support levels at $32 or above $31.92, and then once it sustains a move or close above Wednesday's high and its new 52-week high at $34.79 with volume that's near or above 2.46 million shares. If we get that move soon, then YNDX will set up to enter new 52-week-high territory, which is bullish technical price action. Some possible upside targets off that move are its next major overhead resistance levels at $39.67 to its all-time high at $42.01.

Perfect World

Perfect World (PWRD) is an online game developer and operator in China. This stock closed up 5.8% at $21.40 in Wednesday's trading session.

Wednesday's Volume: 1.14 million

Three-Month Average Volume: 758,073

Volume % Change: 110%

From a technical perspective, PWRD bounced sharply higher here right off some near-term support at $20 with above-average volume. This stock has been uptrending strong for the last four months, with shares moving higher from its low of $9.72 to its recent high of $22.82. During that uptrend, shares of PWRD have been consistently making higher lows and higher highs, which is bullish technical price action. That move has now pushed shares of PWRD within range of triggering a major breakout trade. That trade will hit if PWRD manages to take out some near-term overhead resistance at $22 to its 52-week high at $22.82 with high volume.

Traders should now look for long-biased trades in PWRD as long as it's trending above $20 or its 50-day at $18.84 and then once it sustains a move or close above those breakout levels with volume that's near or above 758,073 shares. If that breakout hits soon, then PWRD will set up to enter new 52-week high territory, which is bullish technical price action. Some possible upside targets off that breakout are its next major overhead resistance levels at $26 to $28.

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.