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 China-based industrial automation specialist Hollysys Automation Technologies (Nasdaq: HOLI) went on a SheiKra-style roller-coaster ride today, climbing 7.8% at the opening bell but plunging as far as 14.2% below last night's closing price in short order. All told, it's a nearly 26% intraday price span on heavy volume.

So what: The early jump makes sense in the light of just reported third-quarter sales and earnings both beating analyst estimates by a wide margin, followed by rosy guidance for the fourth quarter. It's tougher to find a reason for the ensuing crash.

Now what: The same thing happened after the second-quarter report as well, leaving fellow Fool Tim Beyers scratching his head. That time, one analyst quietly downgraded the stock to hold, but there's no analyst activity this time around. Perhaps some large investor had been hoping for even better results.

Hollysys shares are back where they were a year ago after climbing to 70% gains and rolling back down again. The company sees a bright future in control systems for high-speed rails and nuclear reactors in China, and I can't fault you for taking this drop as a buy-in opportunity on this Chinese equivalent of Rockwell Automation (NYSE: ROK).

Interested in more info on Hollysys Automation Technologies? Add it to your watchlist.

Fool contributor Anders Bylund holds no position in any of the companies discussed here. 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 investors writing for investors.