Stock Quotes in this Article: AFFY, EXP, RYAAY, SIMO, TITN

WINDERMERE, Fla. (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. Many times when above-average volume moves into 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.”

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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 today.

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Ryanair Holdings

Ryanair Holdings (RYAAY) operates a low-fares, scheduled passenger airline serving short-haul, point-to-point routes in Europe and Morocco. This stock is trading up 2% at $29.60 in recent trading.

Today’s Volume: 486,000

Average Volume: 257,661

Volume % Change: 315%

From a technical perspective, RYAAY is moving modestly higher here right off some near-term support at $28.95 with heavy volume. In fact, shares of RYAAY have potentially put in a double bottom chart pattern at $28.79 to $28.95 in the last month and change.

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Traders can now look for long-biased trades here as long as those support levels hold up. Make note that RYAAY will trigger a major near-term breakout as well if the stock takes out some overhead resistance at $31.35 to $31.84 with heavy volume.

On the flipside, I would avoid long trades in RYAAY or look for short-biased trades if the stock moves back below $28.85 to $28.79 with high volume.

As of the most recently reported quarter, Ryanair was one of Julian Robertson's Tiger Management holdigns.

Affymax

Affymax (AFFY) is a biopharmaceutical company engaged in developing drugs to improve the treatment of serious and often life-threatening conditions. This stock is trading up 16% at $16.53 in recent trading.

Today’s Volume: 3.4 million

Average Volume: 1 million

Volume % Change: 538%

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From a technical perspective, AFFY is skyrocketing here with monster volume, and the stock has started to enter breakout territory with shares moving above some past overhead resistance at $16.25. This stock has made a monster run in just the past two trading sessions, with shares soaring from under $12 to today’s intraday high of $16.75.

Traders should now look for long-biased trades as long as AFFY is trending above $16.25 and above today’s high of $16.75 with strong upside volume flows. I would consider any upside volume day that registers near or above 1 million shares as bullish. If we continue to see that action, then AFFY could be on its way to its next significant overhead resistance levels at $20 to $24 in the near future.

Globecomm Systems

Globecomm Systems (GCOM) provides satellite-based managed network solutions. Globecomm offers a range of system integration, system products and network services for its customers. This stock is trading up 4% at $10.18 in recent trading.

Today’s Volume: 272,000

Average Volume: 157,975

Volume % Change: 120%

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From a technical perspective, GCOM is ripping here right off some near-term support at $9.50 with monster volume. In fact, it looks like GCOM is starting to put in a double bottom here at $9.44 to $9.50 as the stock rips off those levels with volume today.

Traders should now look for long-biased trades once GCOM takes out its 50-day moving average of $10.68, and then once it moves above some more overhead resistance at $11 to $11.10 with high volume. Look for a sustained move or close above those levels with volume that’s near or above 157,975 shares. If we get that action soon, then this stock could easily take out more resistance at $11.85 and surge back to its 200-day moving average of $13.07.

Silicon Motion Technology

Silicon Motion Technology (SIMO) is a fabless semiconductor company that designs, develops and markets, high-performance, low-power semiconductor solutions for the multimedia consumer electronics market. This stock is trading up 4.4% at $12.47 in recent trading.

Today’s Volume: 458,000

Average Volume: 683,187

Volume % Change: 57%

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From a technical perspective, SIMO is gapping higher here with decent volume off its recent low of $11.32. This stock had been stuck in a clear trading range for the last two months, between $15.41 on the upside and around $13 on the downside. Shares of SIMO broke the lower-end of that range recently after it failed to hold a move above its 50-day moving average of $13.90.

This chart looks completely broken, and at least for right now I wouldn’t be chasing any long-biased trades in SIMO. I might change my mind if SIMO can manage to move back above its 50-day moving average of $13.90 with heavy volume and then take out some resistance levels at $15 to $15.41 with volume.

Titan Machinery

Titan Machinery (TITN) owns and operates a network of agricultural and construction equipment stores in the U.S. and Europe. This stock is trading up 5.4% at $31.73 in recent trading.

Today’s Volume: 350,000

Average Volume: 563,800

Volume % Change: 53%

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From a technical perspective, TITN is ripping back above its 50-day moving average of $30.23 here with decent volume. This move is quickly pushing the stock within range of triggering a near-term breakout trade. That trade will hit once TITN manages to take out some near-term overhead resistance at $32.65 to $33.32 with high volume.

Traders should now look for long-biased trades if TITN can sustain a move or close above those levels with volume that’s near or above 563,800 shares. If we get that action soon, then TITN will have a great chance of re-testing and possibly taking out more resistance at $34.15 to $34.63.

Eagle Materials

Eagle Materials (EXP) is engaged in the manufacture and distribution of gypsum wallboard and the manufacture and sale of cement. This stock is trading up 1.3% at $38.74 in recent trading.

Today’s Volume: 545,000

Average Volume: 612,648

Volume % Change: 84%

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From a technical perspective, EXP is moving modestly higher here with decent volume, and it’s starting to flirt with a major breakout trade above some overhead resistance at $38.70. At last check, shares of EXP have hit an intraday high of $39.29 and volume is just a bit below its three-month average action of 612,648 shares.

Traders should continue to look for long-biased trades as long as EXP is trending above that breakout level of $38.70, and above today’s high of $39.29 with strong upside volume flows. I would consider any upside volume day that registers near or above 612,648 shares as bullish. If we continue to see that action, then EXP should be on its way to north of $40 in the near future.

Potlatch

Potlatch (PCH) is a real estate investment trust. Through Potlatch’s wholly owned subsidiaries, it operates real estate sales and development business, and five wood products manufacturing facilities that produce lumber and plywood. This stock is trading up 2% at $34.80 in recent trading.

Today’s Volume: 197,000

Average Volume: 188,144

Volume % Change: 76%.

From a technical perspective, PCH is bumping up here with above-average volume, and this stock is just starting to flirt with a major breakout trade above some past overhead resistance at $34.74. At last check, PCH has hit an intraday high of $34.93 and volume is tracking in higher than its three-month average volume of 188,144 shares.

Traders should continue to look for long-biased trades in PCH as long as it’s trending above $34.74 to $35 with strong upside volume flows. I would consider any upside volume day that registers near or above 188,144 shares as bullish. If we continue to see that action, then PCH will have a great chance of re-testing and possibly taking out its next significant overhead resistance levels at $35.94 to $37.

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

-- Written by Roberto Pedone in Winderemere, Fla.

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At the time of publication, author had no positions in stocks mentioned.

Roberto Pedone, based out of Windermere, Fla., is an independent trader who focuses on stocks, options, futures, commodities and currencies. He is also an outside contributor to Beconequity.com and maintains the website Maddmoney.net, which he sold to Blue Wave Advisors in 2008. Roberto studied International Business at The Milwaukee School of Engineering, and he spent a year overseas studying business in Lubeck, Germany.