Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Velti (Nasdaq: VELT) have tumbled today by as much as 28% after the company reported earnings.

So what: First-quarter revenue grew 75% to $51.8 million, which generated an adjusted net loss of $1.1 million, or $0.02 per share. CEO Alex Moukas said the company continues to build its mobile marketing business and that 2012 should be a strong year. Velti also increased its full-year guidance.

Now what: During the quarter, Velti completed the acquisition of the remaining equity ownership interest of the parent company of CASEE, a mobile ad exchange and network in China. Next quarter should see revenue between $55 million-$59 million, and Velti raised its full-year revenue outlook to a range of $283 million-$296 million. It's not entirely clear what investors are so disappointed with, and Needham & Company is reiterating its "buy" rating and $20 price target, citing strong performance across all geographies.

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Fool contributor Evan Niu holds no position in any company mentioned. Click here to see his holdings and a short bio. The Motley Fool has a disclosure policy. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. Try any of our Foolish newsletter services free for 30 days.