Stock Quotes in this Article: TREE, TLYS, MZOR

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.

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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.

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

Tree.com

Tree.com (TREE), through its subsidiaries, owns various brands and businesses that provide information, tools, advice, products and services for critical transactions in consumers lives. This stock is trading up 2.9% to $33.21 in Tuesday's trading session.

Tuesday's Volume: 118,000

Three-Month Average Volume: 66,195

Volume % Change: 199%

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From a technical perspective, TREE is trending higher here right above its 50-day moving average of $31.01 with above-average volume. This move has started to push shares of TREE into breakout and new 52-week-high territory, since the stock is flirting with some key overhead resistance at $33.24. Market players should now look for a continuation move higher if shares of TREE can manage to take out Tuesday's high of $33.40 with strong volume.

Traders should now look for long-biased trades in TREE as long as it's trending above Tuesday's low of $32.18 or above its 50-day at $31.01 and then once it sustains a move or close above its new 52-week high at $33.40 with volume that hits near or above 66,195 shares. If we get that move soon, then TREE will set up to enter new 52-week-high territory, which is bullish technical price action. Some possible upside targets off that move are $37 to $40.

Mazor Robotics

Mazor Robotics (MZOR), together with its subsidiary, Mazor Robotics Inc., engages in the development, production, and marketing of medical devices for supporting surgical procedures in the fields of orthopedics and neurosurgery in the U.S., Eastern Europe, Western Europe, and Asia. This stock is trading up 7.6% at $23.90 in Tuesday's trading session.

Tuesday's Volume: 248,000

Three-Month Average Volume: 163,430

Volume % Change: 246%

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From a technical perspective, MZOR is ripping higher here into new all-time-high territory with strong upside volume. This stock has been uptrending strong over the last month and change, with shares soaring higher from its low of $15.35 to its intraday high of $24.49. During that uptrend, shares of MZOR have been making mostly higher lows and higher highs, which is bullish technical price action.

Traders should now look for long-biased trades in MZOR as long as it's trending above Tuesday's low of $23.05 or above more near-term support at $22 and then once it sustains a move or close above its new all-time high at $24.49 with volume that this near or above 163,430 shares. If we get that move soon, then MZOR will set up to enter new all-time-high territory, which is bullish technical price action. Some possible upside targets off that move are $27 to $30.

Tilly's

Tilly's (TLYS) engages in the retailing of casual clothing, footwear and accessories for teens and young adults in the U.S. This stock is trading up 7.9% at $11.55 in Tuesday's trading session.

Tuesday's Volume: 136,000

Three-Month Average Volume: 90,125

Volume % Change: 230%

From a technical perspective, TLYS is ripping higher here right above its 52-week low of $10.59 with above-average volume. This move is quickly pushing shares of TLYS within range of triggering a major breakout trade. That trade will hit if TLYS manages to take out some near-term overhead resistance levels at $12 to $12.28 with high volume.

Traders should now look for long-biased trades in TLYS as long as it's trending above Tuesday's low of $11 or above its 52-week low at $10.59 and then once it sustains a move or close above those breakout levels with volume that hits near or above 90,125 shares. If that breakout hits soon, then TLYS will set up to re-fill some of its previous gap-down-day zone from last November that started at $15.95.

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.