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 job-search service provider Monster Worldwide (NYSE: MWW) roared to an 18.3% gain in intraday trading today on heavy volume.

So what: Having fallen more than 30% over the previous 30 days, Monster bounced back as not one but three top executives bought a significant load of Monster shares on the open market. The company also replaced its CIO today, but the insiders' vote of confidence in the company surely weighs much heavier to most investors.

Now what: Monster used to be a disruptor but is now being disrupted: Traditional foe Dice (NYSE: DHX) has been joined by business-grade social network LinkedIn (Nasdaq: LNKD) and the occasional job-hunt feeler thrown out on Twitter or Facebook. If the CEO, CFO, and a high-ranking VP all buy in after the recent drastic drops, surely they must know something good that we don't? Ah, but the investments only expanded each executive's Monster holdings by about 4% -- hardly an all-in bet. Still, insider buying is often a good sign; at the very least, these guys have some skin in the same game that we individual investors are playing.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.