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.

Mazor Robotics

Mazor Robotics (MZOR) is engaged in the development, production, marketing and servicing of medical devices for supporting surgical procedures in the fields of orthopedics and neurosurgery in the U.S., Western Europe, Eastern Europe and Asia. This stock closed up 11.2% to $12.52 in Monday's trading session.

Monday's Volume: 179,000
Three-Month Average Volume: 64,816
Volume % Change: 177%

From a technical perspective, MZOR exploded sharply higher here right above its new 52-week low of $11.11 with above-average volume. This stock has been downtrending badly for the last month, with shares falling sharply lower from its high of $15.64 to its new 52-week low of $11.11. During that downtrend, shares of MZOR have been consistently making lower highs and lower lows, which is bearish technical price action. That said, shares of MZOR have now started to rebound higher off that $11.11 low, and that could be signaling that trend change is underway for the stock. Market players should now look for a continuation move to the upside in the short-term if MZOR manages to take out Monday's intraday high of $12.90 to its 50-day moving average of $13.31 with high volume.

Traders should now look for long-biased trades in MZOR as long as it's trending above Monday's intraday low $11.59 or above its 52-week low of $11.11 and then once it sustains a move or close above $12.90 to $13.31 with volume that hits near or above 64,816 shares. If that move gets underway soon, then MZOR will set up to re-test or possibly take out its next major overhead resistance levels at $15.64 to $17.

CR Bard

CR Bard (BCR) designs, manufactures, packages, distributes and sells medical, surgical, diagnostic and patient care devices worldwide. This stock closed up 2% at $149.24 in Monday's trading session.

Monday's Volume: 803,000
Three-Month Average Volume: 489,869
Volume % Change: 65%

From a technical perspective, BCR jumped higher here back above its 50-day moving average of $148.26 with above-average volume. This stock has been uptrending for the last few weeks since testing its 200-day moving average at around $142, with shares 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 near-term if BCR manages to take out Monday's intraday high of $149.94 to some more near-term overhead resistance at $150.50 with high volume.

Traders should now look for long-biased trades in BCR as long as it's trending above Monday's intraday low of $147.04 or above $145 and then once it sustains a move or close above $149.94 to $150.50 with volume that's near or above 489,869 shares. If that move kicks off soon, then BCR will set up to re-test or possibly take out its next major overhead resistance levels at $152.50 to its 52-week high at $154.16. Any high-volume moves above its 52-week high will then give BCR a chance to tag $160 to $165.

Sotheby's

Sotheby's (BID - Get Report) operates as an auctioneer of authenticated fine art, decorative art and jewelry. This stock closed up 3.6% at $36.92 in Monday's trading session.

Monday's Volume: 2.13 million
Three-Month Average Volume: 936,415
Volume % Change: 135%

From a technical perspective, BID jumped higher here right above its new 52-week low of $34.74 with above-average volume. This stock has been downtrending over the last month and change, with shares moving lower from its high of $41.95 to its new 52-week low of $34.74. During that downtrend, shares of BID have been consistently making lower highs and lower lows, which is bearish technical price action. That said, shares of BID have started to rebound higher off that $34.74 low and it now looks like a trend change could be underway. Market players should now look for a continuation move higher in the short-term if BID manages to take out Monday's intraday high of $36.95 with high volume.

Traders should now look for long-biased trades in BID as long as it's trending above Monday's intraday low of $35.84 or above its new 52-week low of $34.74 and then once it sustains a move or close above $36.95 with volume that's near or above 936,415 shares. If that move gets started soon, then BID will set up to re-test or possibly take out its next major overhead resistance levels at its 50-day moving average of $38.76 to $40, or even $41 to its 200-day at $41.90.

Clean Harbors

Clean Harbors (CLH - Get Report) provides environmental, energy, and industrial services primarily in the U.S., Puerto Rico, and Canada. This stock closed up 1.5% at $50.77 in Monday's trading session.

Monday's Volume: 1.14 million
Three-Month Average Volume: 478,334
Volume % Change: 157%

From a technical perspective, CLH bounced modestly higher here right off some near-term support at $50.03 with above-average volume. This stock has been downtrending badly for the last three months and change, with shares moving lower from its high of $65.53 to its recent low of $50.03. During that downtrend, shares of CLH have been making mostly lower highs and lower lows, which is bearish technical price action. This move has now pushed shares of CLH into oversold territory, since its current relative strength index reading is 25. Oversold can always get more oversold, but it's also an area where a stock can make a sharp bounce higher from.

Traders should now look for long-biased trades in CLH as long as it's trending above Monday's intraday low of $49.63 and then once it sustains a move or close above Monday's intraday high of $51.19 to some more near-term overhead resistance at $52 with volume that's near or above 478,334 shares. If that move starts soon, then CLH will set up to re-test or possibly take out its next major overhead resistance levels at $54 to $56, or even its 50-day moving average of $57.51.

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

-- 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.