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.

EZchip Semiconductor

EZchip Semiconductor  (EZCH), a fabless semiconductor company, is engaged in the development and marketing of Ethernet network processors for networking equipment. This stock is trading up 3.3% to $22.29 in Monday's trading session.

Monday's Volume: 117,000
Three-Month Average Volume: 125,205
Volume % Change: 159%

From a technical perspective, EZCH is spiking to the upside here right above some near-term support at around $21 with decent upside volume flows. This stock recently formed a major bottoming chart pattern, after shares found buying interest over the last two months anytime it dipped below $19. Following that bottom, shares of EZCH have started to uptrend strong, with shares moving higher from its low of $18.53 to its intraday high of $22.30. That uptrend has now pushed shares of EZCH within range of triggering a major breakout trade above some key overhead resistance levels. That trade will trigger if shares of EZCH manage to take out last October's gap-down-day high of $22.62 and then its 200-day moving average of $22.70 with high volume.

Traders should now look for long-biased trades in EZCH as long as it's trending above some near-term support levels at $21 or at its 50-day moving average of $19.87 and then once it sustains a move or close above those breakout levels with volume that hits near or above 125,205 shares. If that breakout begins soon, then EZCH will set up to re-fill some of its previous gap-down-day zone from last October that started at $25.

McGrath Rentcorp

McGrath Rentcorp  (MGRC - Get Report), a business to business rental company, engages in the rental and sale of relocatable modular buildings, electronic test equipment and liquid and solid containment tanks and boxes in the U.S. and internationally. This stock is trading up 2.2% at $32.71 in Monday's trading session.

Monday's Volume: 104,000
Three-Month Average Volume: 60,720
Volume % Change: 336%

From a technical perspective, MGRC is jumping to the upside here right above some near-term support at $31.50 to $31.11 with above-average volume. This spike higher on Monday is now quickly pushing shares of MGRC within range of triggering a big near-term breakout trade above some key overhead resistance levels. That trade will trigger if MGRC manage to clear some near-term overhead resistance levels at $32.94 to $33.67 with high volume.

Traders should now look for long-biased trades in MGRC as long as it's trending above some key near-term support levels at $31.50 or at $31.11 and then once it sustains a move or close above those breakout levels with volume that hits near or above 60,720 shares. If that breakout starts soon, then MGRC will set up to re-test or possibly take out its next major overhead resistance levels at its 200-day moving average of $34.66 to $37.

Rose Rock Midstream

Rose Rock Midstream (RRMS) owns, operates, develops and acquires diversified portfolio of midstream energy assets in the Cushing, Oklahoma crude oil marketing hub. This stock is trading up 3.1% at $47.86 in Monday's trading session.

Monday's Volume: 117,000
Three-Month Average Volume: 114,392
Volume % Change: 159%

From a technical perspective, RRMS is spiking higher here and breaking out above some near-term overhead resistance levels at $46.33 to $47 with above-average volume. This stock has been uptrending strong over the last two months, with shares moving higher from its low of $36.12 to its intraday high of $48.80. During that uptrend, shares of RRMS have been consistently making higher lows and higher highs, which is bullish technical price action. Market players should now look for a continuation move to the upside in the short-term if RRMS manages to clear Monday's intraday high of $48.80 and then its 200-day moving average of $49.71 with high volume.

Traders should now look for long-biased trades in RRMS as long as it's trending above Monday's intraday low of $46.40 or above $44 and then once it sustains a move or close above $48.80 to $49.71 with volume that hits near or above 114,392 shares. If that move gets underway soon, then RRMS will set up to re-test or possibly take out its next major overhead resistance levels at $53.65 to $55, or even $56.

YY

YY  (YY - Get Report), through its subsidiaries, operates an online social platform in the People's Republic of China. This stock is trading up 1.5% at $53.53 in Monday's trading session.

Monday's Volume: 1.40 million
Three-Month Average Volume: 1.32 million
Volume % Change: 127%

From a technical perspective, YY is moving higher here right above its 52-week low of $51.08 with above-average volume. This stock has been downtrending badly for the last month and change, with shares moving lower from its high of $73.04 to its intraday low of $51.38. During that downtrend, shares of YY have been consistently making lower highs and lower lows, which is bearish technical price action. That move has now pushed shares of YY into oversold territory, since its current relative strength index reading is 23.5. Oversold can always get more oversold, but it's also an area where a stock can experience a powerful bounce higher from. Market players should now look for a continuation move to the upside if YY manages to take out Monday's intraday high of $54.70 to just over $57.50 with high volume.

Traders should now look for long-biased trades in YY as long as it's trending above Monday's intraday low of $51.38 or above its 52-week low of $51.08 and then once it sustains a move or close above $54.70 to $57.50 with volume that's near or above 1.32 million shares. If that move kicks off soon, then YY will set up to re-test or possibly take out its next major overhead resistance levels at $62 to $64, or even its 50-day moving average of $65.79.

-- Written by Roberto Pedone in Delafield, Wis.

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This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.