Stock Quotes in this Article: EIX, GM, P, RRTS

MADISON, 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.

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.

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

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General Motors

General Motors (GM) designs, builds and sell cars, trucks and automobile parts. The company also provides automotive financing services. This stock closed up 1.7% at $35.03 on Friday.

Friday's Volume: 30.63 million

Average Volume: 13.47 million

Volume % Change: 125%

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From a technical perspective, GM bounced modestly higher here right off some near-term support at $34 with heavy upside volume. This stock has been uptrending strong for the last four months, with shares soaring higher from its low of $26.19 to its recent high of $35.49. During that move, shares of GM have been consistently making higher lows and higher highs, which is bullish technical price action. That move is now quickly pushing shares of GM within range of triggering a near-term breakout trade. That trade will hit if GM manages to take out its 52-week high at $35.49 with high volume.

Traders should now look for long-biased trades in GM as long as it's trending above some key near-term support levels at $34 to $33.78, and then once it sustains a move or close above its 52-week high at $35.49 with volume that hits near or above 13.47 million shares. If that breakout triggers soon, then GM will set up to enter new 52-week-high territory, which is bullish technical price action. Some possible upside targets off that breakout are $40 to $45.

Edison International

Edison International (EIX) is a generator and distributor of electric power and an investor in infrastructure and energy assets, including renewable energy. This stock closed up 2.7% to $47.61 on Friday.

Friday's Volume: 6.35 million

Average Volume: 2.58 million

Volume % Change: 139%

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From a technical perspective, EIX trended higher here right above some near-term support at $46.20 and back above its 200-day moving average at $46.88 with heavy upside volume. This stock has been downtrending badly for the last month and change, with shares falling from its high of $54.19 to its recent low of $46.20. During that move, shares of EIX have been consistently making lower highs and lower lows, which is bearish technical price action. That said, shares of EIX have started to reverse its downtrend and downside volatility with the stock closing that $46.20 low back above its 200-day with volume.

Traders should now look for long-biased trades in EIX as long as it's trending above its 200-day at $46.88 with strong upside volume flows. I would consider any upside volume day that registers near or above its three-month average action of 2.58 million shares as bullish. If EIX can maintain that trend, then this stock will set up to re-test or possibly take out its 50-day moving average of $50.15 or its next major overhead resistance levels at $52 or $53.

Roadrunner Transportation Systems

Roadrunner Transportation Systems (RRTS) is an asset-light transportation and logistics service provider. This stock closed up 3.5% at $27.88 on Friday.

Friday's Volume: 412,000

Average Volume: 187,884

Volume % Change: 112%

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From a technical perspective, RRTS bounced sharply higher here right above some near-term support at $26.69 with above-average volume. This stock has been uptrending strong for the last six months, with shares soaring higher from its low of $16.31 to its recent high of $28.24. During that move, shares of RRTS have been mostly making higher lows and higher highs, which is bullish technical price action. That move has now pushed shares of RRTS within range of triggering a near-term breakout trade. That trade will hit if RRTS manages to take out its 52-week high at $28.24 with high volume.

Traders should now look for long-biased trades in RRTS as long as it's trending above some key near-term support at $26.69, and then once it sustains a move or close above its 52-week high at $28.24 with volume that hits near or above 187,884 shares. If that breakout triggers soon, then RRTS will set up to enter new 52-week-high territory, which is bullish technical price action. Some possible upside targets off that breakout are $30 to $33.

Pandora Media

Pandora Media (P) provides Internet radio services in the U.S. This stock closed up 5.6% to $15.12 on Friday.

Friday's Volume: 11.72 million

Average Volume: 6.32 million

Volume % Change: 80%

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From a technical perspective, P ripped higher right off some near-term support around $14 and back above its 50-day moving average at $14.67 with heavy upside volume. This stock has been downtrending over the last few weeks, with shares falling from its 52-week high at $19.37 to just below $14. During that move, shares of P have been mostly making lower highs and lower lows, which is bearish technical price action. That said, shares of P saw its downside volatility abate on Friday, and the stock finished back above its 50-day. That action is quickly moving P within range of triggering a near-term breakout trade. That trade will hit if P manages to take out some near-term overhead resistance at $15.50 with high volume.

Traders should now look for long-biased trades in P as long as it's trending above its 50-day at $14.67 or above some key near-term support just below $14, and then once it sustains a move or close above $15.50 with volume that hits near or above 6.32 million shares. If that breakout triggers soon, then P will set up to re-test or possibly take out its next major overhead resistance levels at $17.54 to its 52-week high at $19.37. Any high-volume move above $19.37 will then put its next major overhead resistance levels at $22 to $26 into range for shares of P.

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

-- Written by Roberto Pedone in Madison, Wis.

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

Roberto Pedone, based out of Madison, 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.