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.

Arista Networks

Arista Networks  (ANET - Get Report) provides cloud networking solutions. This stock is trading up 1.4% to $70.52 in Monday's trading session.

Monday's Volume: 491,000
Three-Month Average Volume: 612,882
Volume % Change: 104%

From a technical perspective, ANET is spiking higher here right above some near-term support levels at $67.50 to $66.23 with decent upside volume flows. This move to the upside on Monday is starting to push shares of ANET within range of triggering a major breakout trade above some key overhead resistance levels. That trade will trigger if ANET manages to take out some key overhead resistance levels at $74 to $74.50 with high volume.

Traders should now look for long-biased trades in ANET as long as it's trending above some near-term support levels at $67.50 or at $66.23 and then once it sustains a move or close above those breakout levels with volume that registers near or above 612,882 shares. If that breakout hits soon, then ANET will set up to re-test or possibly take out its next major overhead resistance levels at $77.90 to $79.38, or even $80 a share.

Cytosorbents

Cytosorbents  (CTSO), a development stage company, is engaged in the research, development and commercialization of medical devices with its platform blood purification technology incorporating a proprietary adsorbent polymer technology. This stock is trading up 4.7% to $12.47 in Monday's trading session.

Monday's Volume: 181,000
Three-Month Average Volume: 165,747
Volume % Change: 163%

From a technical perspective, CTSO is ripping sharply higher here and breaking out above some near-term overhead resistance at $12.24 with above-average volume. This stock has been uptrending incredibly strong over the last two months and change, with shares ramping sharply higher from its low of $7.75 to its intraday high of $12.69. During that uptrend, shares of CTSO have been making mostly higher lows and higher highs, which is bullish technical price action. This spike to the upside on Monday is now starting to push shares of CTSO within range of triggering another big breakout trade. That trade will hit if shares of CTSO manage to take out its 52-week high of $12.87 with high volume.

Traders should now look for long-biased trades in CTSO as long as it's trending above some key near-term support levels at $11 to $10.75 and then once it sustains a move or close above its 52-week high of $12.87 with volume that hits near or above 165,747 shares. If that breakout begins soon, then CTSO will set up to enter new 52-week-high territory, which is bullish technical price action. Some possible upside targets off that breakout are $15 to $17.

Henry Schein

Henry Schein  (HSIC - Get Report) provides health care products and services worldwide. This stock is trading up 3.1% to $140.62 in Monday's trading session.

Monday's Volume: 519,000
Three-Month Average Volume: 415,344
Volume % Change: 190%

From a technical perspective, HSIC is spiking notably higher here right above some near-term support at $135.56 with above-average volume. This spike to the upside on Monday has now started to push shares of HSIC back above its 50-day moving average of $140.01. Shares of HSIC are now starting to trend within range of triggering a major breakout trade above some key near-term overhead resistance levels. That trade will hit if HSIC manages to take out some key near-term overhead resistance levels at $142.50 to $143.24 and then above its 52-week high of $143.89 with high volume.

Traders should now look for long-biased trades in HSIC as long as it's trending above Monday's intraday low of $137.32 or above more near-term support at $135.56 and then once it sustains a move or close above those breakout levels with volume that hits near or above 415,344 shares. If that breakout materializes soon, then HSIC will set up to enter new 52-week-high territory above $143.89, which is bullish technical price action. Some possible upside targets off that move are $150 to $155, or even $160 a share.

Revance Therapeutics

Revance Therapeutics  (RVNC - Get Report), a biopharmaceutical company, focuses on the development, manufacture and commercialization of novel botulinum toxin products for various aesthetic and therapeutic applications worldwide. This stock is trading up 2.3% at $18.69 in Monday's trading session.

Monday's Volume: 122,000
Three-Month Average Volume: 159,125
Volume % Change: 115%

From a technical perspective, RVNC is spiking higher here right above some near-term support at around $17.50 with decent upside volume flows. This stock recently broke out above some key near-term overhead resistance levels at $18.50 to $18.68 a share, and this move to the upside on Monday is a continuation move of that breakout. Shares of RVNC are now starting to move into a previous gap-down-day zone from last November that started near $21. Market players should now look for a continuation move into that gap-down-day zone in the short-term if RVNC manages to take out Monday's intraday high of $18.95 with high volume.

Traders should now look for long-biased trades in RVNC as long as it's trending above some key near-term support levels at $18 or at $17.50 and then once it sustains a move or close above $18.95 with volume that hits near or above 159,125 shares. If that move gets underway soon, then RVNC will set up to re-fill some more of its previous gap-down-day zone from last November that started at $21.

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