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 UTi Worldwide (Nasdaq: UTIW) rose nearly 12% on huge volume in early trading before snapping back down to up just 3% as of this writing.

So what: UTi has attracted millions since replacing Chipotle in the S&P MidCap 400 index. The stock had already achieved twice the average trading volume as of this writing.

Now what: Though UTi is a momentum play, there is a long-term growth story here. Analysts expect the company's supply chain services to boost profits by 19% annually over the next five years. If they're right, the stock's forward P/E ratio of 24, while not cheap, is probably reasonable.

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

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

Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team. Both our Rule Breakers and Motley Fool Hidden Gems services have recommended members purchase shares of Chipotle. You can try any of our Foolish newsletter services free for 30 days.

Tim owned shares of Chipotle at the time of publication. Check out his portfolio holdings and Foolish writings, or connect with him on Twitter as @milehighfool. You can also get his insights delivered directly to your RSS reader. 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 also on Twitter as @TheMotleyFool. Its disclosure policy is at least 10% better than other disclosure policies.