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 prepaid debit card provider Green Dot (NYSE: GDOT) experienced heavy volatility Tuesday on extraordinarily high volume.

So what: Within the first 15 minutes of trading, the stock plummeted as much as 17.5%, only to quickly rebound and recover most of that loss. At the time of this writing, Green Dot is down only about 4.6%, with a whopping 1.1 million shares having already changed hands (versus its average volume of just 285,500).

Now what: Investors should keep today's move in proper perspective. Without any news from the company, I'm chalking the wild swing up to the normal volatility that comes with a relatively young, high-growth, high-P/E stock. Valuation aside, Green Dot is a well-positioned long-term play on the nearly 60 million "underbanked" Americans, and today's share price roller-coaster ride shouldn't do a whole lot to change that.

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

Fool contributor Brian Pacampara owns no position in any of the companies mentioned. Try any of our Foolish newsletter services free for 30 days.

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