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.

Signet Jewelers

Signet Jewelers (SIG - Get Report) engages in the retail sale of jewelry and watches in the U.S., the U.K., the Republic of Ireland and the Channel Islands. This stock closed up 6.1% to $79.02 in Monday's trading session.

Monday's Volume: 2.88 million
Three-Month Average Volume: 767,540
Volume % Change: 290%

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From a technical perspective, SIG gapped sharply higher here back above its 50-day moving average of $76.48 with strong upside volume. This spike helped shares of SIG fill its previous gap-down-day zone from earlier this month that started right around $80. Shares of SIG are now quickly moving within range of triggering a big breakout trade. That trade will hit if SIG manages to take out Monday's high of $79.69 to its 52-week high at $80.18 with high volume.

Traders should now look for long-biased trades in SIG as long as it's trending above its 50-day at $76.48 and then once it sustains a move or close above those breakout levels with volume that hits near or above 767,540 shares. If that breakout hits soon, then SIG will set up to enter new 52-week-high territory, which is bullish technical price action. Some possible upside targets off that breakout are $85 to $90.

Arrowhead Research

Arrowhead Research (ARWR - Get Report), a biopharmaceutical company, develops targeted RNAi therapeutics in the U.S. This stock closed up 2.6% to $12.03 in Monday's trading session.

Monday's Volume: 1.05 million
Three-Month Average Volume: 595,706
Volume % Change: 165%

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From a technical perspective, ARWR spiked notably higher here right above some near-term support at $10.80 with above-average volume. This stock has been uptrending strong for the last six months, with shares moving higher from its low of $3.75 to its recent high of $13.87. During that move, shares of ARWR have been consistently making higher lows and higher highs, which is bullish technical price action. That move has now pushed shares of ARWR within range of triggering a major breakout trade. That trade will hit if ARWR manages to take out some near-term overhead resistance levels at $13 to its 52-week high at $13.87 with high volume.

Traders should now look for long-biased trades in ARWR as long as it's trending above Monday's low of $11.20 or above support at $10.80 and then once it sustains a move or close above those breakout levels with volume that hits near or above 595,706 shares. If that breakout hits soon, then ARWR will set up to enter new 52-week-high territory, which is bullish technical price action. Some possible upside targets off that breakout are $16 to $18.

Innophos

Innophos (IPHS - Get Report), through its subsidiaries, engages in the production of mineral based specialty ingredients for food, beverage, dietary supplements, pharmaceutical, oral care and industrial end markets. This stock closed up 2.3% to $49.50 in Monday's trading session.

Monday's Volume: 268,000
Three-Month Average Volume: 135,463
Volume % Change: 135%

From a technical perspective, IPHS spiked notably higher here right off its 50-day moving average of $47.99 with above-average volume. This move is quickly pushing shares of IPHS within range of triggering a near-term breakout trade. That trade will hit if IPHS manages to take out Monday's high of $50.10 to some more near-term overhead resistance at $50.31 with high volume.

Traders should now look for long-biased trades in IPHS as long as it's trending above some key near-term support levels at $47.90 or at $47.30 and then once it sustains a move or close above those breakout levels with volume that this near or above 135,463 shares. If that breakout hits soon, then IPHS will set up to re-test or possibly take out its next major overhead resistance levels at $53 to $55.

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.