Stock Quotes in this Article: INFA, SLAB, ATHM, GRUB

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.

GrubHub

GrubHub (GRUB) provides an online and mobile platform for restaurant pick-up and delivery orders in the U.S. This stock closed up 7.9% at $38.02 in Monday's trading session.

Monday's Volume: 817,000

Three-Month Average Volume: 451,624

Volume % Change: 90%

From a technical perspective, GRUB ripped sharply higher here and broke out above some key near-term overhead resistance levels at $37.33 to $37.79 with above-average volume. This large move to the upside on Monday is quickly pushing shares of GRUB within range of triggering an even bigger breakout trade. That trade will hit if GRUB manages to clear some key overhead resistance levels at $39.12 to its all-time high at $40.80 with high volume.

Traders should now look for long-biased trades in GRUB as long as it's trending above $36 or above Monday's intraday low of $35.03 and then once it sustains a move or close above those breakout levels with volume that's near or above 451,624 shares. If that breakout materializes soon, then GRUB will set up to enter new all-time-high territory, which is bullish technical price action. Some possible upside targets off that breakout are $45 to $50, or even $55.

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Autohome

Autohome (ATHM) operates as an online destination for automobile consumers in the People's Republic of China. This stock closed up 8.1% at $37.30 in Monday's trading session.

Monday's Volume: 491,000

Three-Month Average Volume: 324,346

Volume % Change: 63%

From a technical perspective, ATHM exploded sharply higher here right off its 50-day moving average of $34.18 with above-average volume. This strong move to the upside on Monday pushed shares of ATHM into breakout territory, since the stock took out some near-term overhead resistance at $34.64. Shares of ATHM are now quickly moving within range of triggering another big breakout trade. That trade will hit if ATHM manages to take out Monday's intraday high of $37.49 to some past overhead resistance at $37.79 with high volume.

Traders should now look for long-biased trades in ATHM as long as it's trending above $35 or above its 50-day moving average at $34.18 and then once it sustains a move or close above those breakout levels with volume that hits near or above 324,346 shares. If that breakout kicks off soon, then ATHM will set up to re-test or possibly take out its next major overhead resistance levels at $42.68 to $44.

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Informatica

Informatica (INFA) provides data integration software and services worldwide. This stock closed up 4.3% at $31.99 in Monday's trading session.

Monday's Volume: 4.32 million

Three-Month Average Volume: 1.06 million

Volume % Change: 319%

From a technical perspective, INFA gapped up sharply higher here right above its 52-week low of $29.87 with strong upside volume flows. This stock recently gapped down shares from $35.07 to its new 52-week low at $29.87 with monster downside volume. Shares of INFA have now started to rebound off its 52-week low and it's starting to move back into that gap-down-day zone with solid volume. Market players should now look for a continuation move to the upside in the short-term if INFA manages to take out Monday's intraday high of $32 with high volume.

Traders should now look for long-biased trades in INFA as long as it's trending above Monday's intraday low of $30.87 or above its 52-week low of $29.87 and then once it sustains a move or close above $32 with volume that hits near or above 1.06 million shares. If that move gets underway soon, then INFA will set up to re-fill some more of its previous gap-down-day zone that started at $35.07.

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Silicon Laboratories

Silicon Laboratories (SLAB), a fabless semiconductor company, designs and develops analog-intensive, mixed-signal integrated circuits. This stock closed up 2.1% at $40.89 in Monday's trading session.

Monday's Volume: 1.10 million

Three-Month Average Volume: 542,498

Volume % Change: 117%

From a technical perspective, SLAB jumped notably higher here right above its recent low of $39.28 with above-average volume. This stock recently gapped down sharply lower from just over $46 to $39.28 with monster downside volume. Shares of SLAB are now starting to rebound off that low of $39.28 and off oversold levels, since its current relative strength index reading is 25.38. Market players should now look for a continuation move off oversold levels in the short-term if SLAB can manage to take out Monday's intraday high of $40.98 with strong upside volume flows.

Traders should now look for long-biased trades in SLAB as long as it's trending above Monday's intraday low of $39.80 or above that recent low of $39.28 and then once it sustains a move or close above Monday's intraday high of $40.98 with volume that this near or above 542,498 shares. If that move gets started soon, then SLAB will set up to re-test or possibly take out its gap-down-day high at $43.51. Any high-volume move above that level will then give SLAB a chance to re-fill some if its previous gap-down-day zone that started just above $46.

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.