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.

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.

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

RingCentral

RingCentral (RNG - Get Report) provides software-as-a-service solutions for business communications primarily in the U.S. This stock is trading up 3.4% to $14.53 in Wednesday's trading session.

Wednesday's Volume: 823,000
Three-Month Average Volume: 433,045
Volume % Change: 198%

From a technical perspective, RNG is ripping higher here right off its 50-day moving average of $13.78 with above-average volume. This spike to the upside on Wednesday is now quickly pushing shares of RNG within range of triggering a near-term breakout trade. That trade will hit if RNG manages to take out some key near-term overhead resistance at $15.02 to $15.06 with high volume.

Traders should now look for long-biased trades in RNG as long as it's trending above its 50-day at $13.78 or above more near-term support at $13.31 and then once it sustains a move or close above those breakout levels with volume that registers near or above 433,045 shares. If that breakout begins soon, then RNG will set up to re-test or possibly take out its next major overhead resistance levels at $15.80 to $17 or even $18.25.

Green Dot

Green Dot (GDOT - Get Report) , together with its subsidiaries, operates as a technology-centric, pro-consumer bank holding company that provides personal banking for the masses. This stock is trading up 5.4% at $14.70 in Wednesday's trading session.

Wednesday's Volume: 1.08 million
Three-Month Average Volume: 643,527
Volume % Change: 311%

From a technical perspective, GDOT is spiking higher here right above its new 52-week low of $13.87 with strong upside volume flows. This stock recently gapped down sharply from around $20 to under $16 with heavy downside volume flows. Following that move, shares of GDOT continued to trend lower and the stock printed a new 52-week low of $13.87. That move has now pushed shares of GDOT into extremely oversold territory, since its current relative strength index reading is 20. Shares of GDOT are now starting to spike higher off oversold levels and it's beginning to move within range of triggering a near-term breakout trade. That trade will hit if GDOT manage to take out some key near-term overhead resistance levels at $15.30 to $15.75 with high volume.

Traders should now look for long-biased trades in GDOT as long as it's trending above its new 52-week low of $13.87 and then once it sustains a move or close above $15.30 to $15.75 with volume that hits near or above 643,527 shares. If that breakout hits soon, then GDOT will set up to re-test or possibly take out its next major overhead resistance level at its gap-down-day high of $17.17.

Silicon Laboratories

Silicon Laboratories (SLAB - Get Report) , a fabless semiconductor company, designs and develops analog-intensive, mixed-signal integrated circuits. This stock is trading up 7.9% to $47.67 in Wednesday's trading session.

Wednesday's Volume: 294,000
Three-Month Average Volume: 264,600
Volume % Change: 439%

From a technical perspective, SLAB is exploding higher here back above both its 200-day moving average of $44.85 and its 50-day moving average of $46.06 with strong upside volume flows. This spike to the upside on Wednesday has also pushed shares of SLAB into breakout territory, since the stock has clear some near-term overhead resistance at $46.56. Shares of SLAB are now quickly trending within range of triggering another big breakout trade. That trade will hit if SLAB manages to take out some more key near-term overhead resistance levels at $48.49 to $48.50 with high volume.

Traders should now look for long-biased trades in SLAB as long as it's trending above its 50-day at $46.06 or above Wednesday's intraday low of $44.18 and then once it sustains a move or close above those breakout levels with volume that hits near or above 264,600 shares. If that breakout triggers soon, then SLAB will set up to re-test or possibly take out its next major overhead resistance levels $50.05 to $52.72, or even its 52-week high of $54.

Orbital Sciences

Orbital Sciences (ORB) develops and manufactures small- and medium-class rockets and space systems for commercial, military, and civil government customers in the U.S., Europe, Eurasia, Mexico, South America, and East Asia. This stock is trading up 2.3% to $28.71 in Wednesday's trading session.

Wednesday's Volume: 808,000
Three-Month Average Volume: 570,590
Volume % Change: 218%

From a technical perspective, ORB is trending modestly higher here right above its 200-day moving average of $27.27 with above-average volume. This stock has been uptrending strong for the last month and change, with shares moving higher from its low of $22 to its recent high of $30.72. During that uptrend, shares of ORB have been making mostly higher lows and higher highs, which is bullish technical price action. That move has now started to push shares of ORB within range of triggering a major breakout trade. That trade will hit if ORB manages to take out some key overhead resistance levels at $29.50 to $30.78 with high volume.

Traders should now look for long-biased trades in ORB as long as it's trending above its 200-day at $27.27 or above its 50-day at $26.40 and then once it sustains a move or close above those breakout levels with volume that registers near or above 570,590 shares. If that breakout develops soon, then ORB will set up to re-test or possibly take out its next major overhead resistance level at its 52-week high of $34.16.

-- 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.