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 Tortoise Energy Infrastructure (NYSE: TYG) fell 10% briefly today after a big trade hit the market.

So what: The day was moving along quietly when suddenly just after 1 p.m. ET more than 100,000 shares traded hands in just a few minutes. Three-month average daily volume is just 62,000 shares, and the move has helped send volume over 300,000 for the day with an hour left in the trading day.

Now what: There was no news from the company today, but the market was obviously spooked by the sudden selling. Shares are only down just 4% for the day as I’m writing, so I wouldn’t panic too much today. Blame it on our mythical friend called Fat Finger Freddy, who types a few extra digits in his trading machine every once in a while, giving us a wild intraday move.

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