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 Och-Ziff Capital Management Group (NYSE:OZM) plunged 11% today after a report said the hedge fund helped finance controversial oil and mining deals in Africa.

So what: According to The Wall Street Journal, Och-Ziff made two loans of $234 million to companies controlled by Israeli billionaire Dan Gertler -- whose deals have been criticized for lacking transparency -- putting the hedge fund under serious scrutiny from U.S. authorities. While WSJ isn't exactly sure about the specific kind of information that U.S. investigators are seeking from Och-Ziff, the report alone raises plenty of uncertainty over the stock's appreciation prospects.

Now what: Gertler remains confident that the controversy surrounding his deals in Africa is completely overblown. "[Gertler] vigorously contests any and all accusations of wrongdoing in any of his Congo dealings," said a spokesman for the mining magnate. "Though we are a private business, we recognize we do have certain disclosure obligations and as our business develops, we are acting to improve our transparency efforts." So while the uncertainty surrounding Och-Ziff could be too much for average investors, less risk-averse contrarians might want to use today's plunge to bet on that confidence. 

Brian Pacampara has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. 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 has a disclosure policy.