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 oil and gas exploration company HyperDynamics (AMEX: HDY) jumped as high as 11.4% in morning trading today, extending the stock's 10% popping streak to three straight days.

So what: After an analyst upgrade and an impressive presentation at its annual shareholder meeting, HyperDynamics did an encore by appointing a VP of business development.

Now what: New VP Andrei Orlov comes with a fine pedigree of increasing responsibility at engineering firms Foster Wheeler (Nasdaq: FWLT) and SNC-Lavalin (Pink Sheets: SNCAF.PK) -- both highly appropriate stopovers for an explorer of natural resources. Still, HyperDynamics' stock has gained 500% over the last six months and looks risky to me based on inflated prices, especially when you take into consideration the company's history of signing farm-out letters of intent only to have them canceled before a drill ever gets planted. Fellow Fool and energy expert Toby Shute can think of several peers with more attractive stocks.

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Fool contributor Anders Bylund holds no position in any of the companies discussed here. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool is investors writing for investors.