Stock Quotes in this Article: MIC, RPRX, SKYW, TROX

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. 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.

Tronox (TROX)

This company is a producer and marketer of titanium dioxide pigment, which is an inorganic white pigment used in paint, coatings, plastics, paper and many other everyday products. This stock is trading up 8.6% at $17.13 in recent trading.

Today's Volume: 3.25 million

Average Volume: 1.63 million

Volume % Change: 259%

From a technical perspective, TROX is gapping higher here right above some near-term support at $15 with heavy upside volume. This move has pushed TROX into breakout territory, since the stock has pushed above some near-term overhead resistance at $16.64.

Traders should now look for long-biased trades in TROX as long as it's trending above $16.64 with strong upside volume flows. I would consider any upside volume day that registers near or above 1.63 million shares as bullish. If TROX can maintain that trend, then this stock has a great chance of re-testing or taking out its next major overhead resistance levels at its 50-day of $18.58 to $19.

Repros Therapeutics (RPRX)

This is a development stage biopharmaceutical company focused on the development of oral small molecule drugs for major unmet medical needs in male and female health. This stock is trading up 5.5% at $14.54 in recent trading.

Today's Volume: 313,000

Average Volume: 187,944

Volume % Change: 185%

From a technical perspective, RPRX is ripping higher here back above its 50-day at $14.24 with above-average volume. This move is quickly pushing RPRX within range of triggering a near-term breakout trade. That trade will hit once RPRX takes out some near-term overhead resistance levels at $15.54 to $15.70 with high volume.

Traders should now look for long-biased trades in RPRX as long as it's trending above its 50-day at $14.24, and then once it sustains a move or close above those breakout levels with volume that hits near or above 187,944 shares. If that breakout triggers soon, then RPRX will set up to re-test or possibly take out its 52-week high of $17. Any move above $17 will then push RPRX into new 52-week high territory, which is bullish technical price action.

SkyWest (SKYW)

This company offers scheduled passenger service to destinations in the United States, Canada, Mexico and the Caribbean. This stock is trading up 4.1% at $12.38 in recent trading.

Today's Volume: 591,000

Average Volume: 387,444

Volume % Change: 156%

From a technical perspective, SKYW is ripping to the upside here right above its 50-day moving average of $11.33 with above-average volume. This move has started to push SKYW into breakout territory, since the stock has pushed above some past overhead resistance at $11.91.

Traders should now look for long-biased trades in SKYW as long as it's trending above that breakout level of $11.91 with strong upside volume flows. I would consider any upside volume day that registers near or above its three-month average volume of 387,444 shares. If SKYW can maintain that trend, then this stock will set up to re-test or possibly take out its next major overhead resistance levels at $14.21 to $15.

Macquarie Infrastructure (MIC)

This company owns, operates and invests in a group of infrastructure businesses that provide basic services, such as chilled water for building cooling and gas utility services to businesses and individuals primarily in the U.S. This stock is trading up 1.1% at $44.44 in recent trading.

Today's Volume: 337,000

Average Volume: 221,758

Volume % Change: 152%

From a technical perspective, MIC is spiking higher here right above its 50-day at $42.57 with above-average volume. This move is quickly pushing shares of MIC within range of triggering a major breakout trade. That trade will hit once MIC manages to clear its 52-week high of $44.67 with high volume.

Traders should now look for long-biased trades in MIC as long as it's trending above its 50-day at $42.57, and then once it sustains a move or close above $44.58 to $44.67 with volume that hits near or above 221,758 million shares. If that breakout triggers soon, then MIC will set up to enter new 52-week high territory, which is bullish technical price action. Some possible upside targets off that breakout are $50 to $55 in the 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 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.