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 health insurance provider Universal American (NYSE: UAM) climbed 11% in intraday trading Tuesday on above-average volume.

So what: Universal has been on quite the winning streak over the past few trading days, with the shares now up a whopping 24% since Thursday. I couldn't find any news driving the recent surge, but with volume also picking up of late, it's probably safe to assume that some institution wants in on Universal in a very big way.

Now what: Now might be a good time to lighten up on the shares. It's tempting to speculate that a potential takeover is in the works, but without any concrete news coming out of Universal, taking at least some dough off the table seems like the prudent thing to do. With higher-margin, higher-return rivals like UnitedHealth (NYSE: UNH) and Humana (NYSE: HUM) trading at a forward P/E discount to Universal, you'll have plenty of places to roll your bet over.

Interested in more info on Universal? Add it to your watchlist.

Motley Fool newsletter services have recommended buying shares of and creating a diagonal call position in UnitedHealth. The Motley Fool owns shares of UnitedHealth. Try any of our Foolish newsletter services free for 30 days.

Fool contributor Brian Pacampara owns no position in any of the companies mentioned. 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 Fool's disclosure policy always gets a perfect score.