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 mortgage insurer MGIC Investment
So what: Hayman Capital Management, run by J. Kyle Bass, disclosed a 4.9% stake in MGIC. Why is that so notable? Because Bass had bet against the housing market before it imploded. The new stake is a vote of confidence in a company that's at the center of the downtrodden housing market and has seen its stock get pummeled.
Now what: A move like this from a sharp investor is no doubt notable, and for investors on the sidelines it could be a reason to take a closer look at the MGIC story.
However, we've been here with this same industry and this same story, and it didn't work out so well for piggybacking investors. What I'm talking about is John Paulson's bet last year on fellow mortgage insurer PMI Group
This doesn't mean that the same fate will befall MGIC, but it's important to remember that having a hotshot investor stepping in is never a guarantee of success.
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Fool contributor Matt Koppenheffer has no financial interest in any of the companies mentioned. You can check out what Matt is keeping an eye on by visiting his CAPS portfolio, or you can follow Matt on Twitter, @KoppTheFool, or on Facebook. The Fool's disclosure policy prefers dividends over a sharp stick in the eye.