When a company's stock moves significantly on big volume, there's reason to investigate. It could be an earnings report, or an expected earnings report, a takeover attempt or just institutional investors smelling something cooking - any number of factors might account for such an occurrence. But when all is said and done, big volume behind a stock's rise is generally understood as bullish. (Learn about the uses of trade volume, read: Dow Theory: Volume Must Confirm The Trend).

That said, here are a number of Nasdaq listed stocks whose recent activity indicates a great deal of bullishness.

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Health Info Jump
WebMD Health Corp.
(Nasdaq:WBMD) is in the business of providing health information, primarily over the internet. Last Friday, share volume in the company's stock jumped to six times the daily average, and the shares gapped higher by 6.37%. The proximate cause of the move was higher Q4 revenues and net income results of $1.39 per share versus $0.11 for the same quarter last year.

In the last twelve months, WebMD stock is up over 100%. For the last five years, the company has grown revenues by over 28% annually.

Open Your Portfolio
Open Text Corp. (Nasdaq:OTEX) provides content management software to clients in North America and Europe. In the last twelve months the stock is up about 45%, but the last two weeks alone have seen gains of nearly 20% on between double and eight times the stock's average daily share volume. They're still trailing the broad tech index as represented by the PowerShares QQQ Trust ETF (Nasdaq:QQQQ), which rose by 55% over the last year.

The move in Open Text followed the company's report of strong second quarter 2010 results. Revenue was higher by 20% over the comparable period last year.

Brush Your Way to Profits
Sirona Dental Systems, Inc.
(Nasdaq:SIRO) stock has made consistent gains for the last year, posting new highs almost weekly. For the year, the stock is up better than 170%, and the last few weeks have seen several bursts in volume. The first came after the company provided better than expected earnings guidance and the second on the day the earnings report was actually released.

Volume climbed to between two and five times the daily average on a full five of the last nine trading sessions. Sirona manufactures equipment and systems for dentists.

Conducting Trades
Cree, Inc. (Nasdaq:CREE) is in the semiconductor manufacturing business. Late January saw nearly 12 million shares trade on a stock that until then averaged less than 2 million. Cree shares are up 240% in the last year.

The Wrap
The above listed names have seen consistent gains in the last twelve months, and if recent interest in the shares is any indication, the stocks stand to continue rising through 2010.

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