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 Valhi (NYSE: VHI) fell as much as 13% in a steady decline today.

So what: Yesterday after the market close, Valhi subsidiary Waste Control Specialists announced a new contract with the Tennessee Valley Authority to dispose of radioactive waste. The market cheered the news early in trading but support fell apart quickly and shares bottomed around 2 p.m. ET.

Now what: The move is a little odd, but Valhi is a relatively low-volume stock and movements can be choppy. Trading picked up throughout the day, indicating that sellers flooded the market pushing prices lower. I wouldn't get too worked up about this move because the new contract should help the company long term.

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

Fool contributor Travis Hoium does not have a position in any company mentioned. You can follow Travis on Twitter at @FlushDrawFool, check out his personal stock holdings or follow his CAPS picks at TMFFlushDraw.

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