NEW YORK ( TheStreet) -- Stocks are once again trading near their pre-Lehman Brothers highs. But the journey in the last two years for investors has been anything but smooth. Volatility has increased significantly and even large-caps have not proved safe from sudden sharp downward swings. TheStreet presents ten of the most volatile large-cap stocks so far in 2010. Volatility is calculated on a historical basis as the standard deviation from average daily logarithmic price changes using Bloomberg data. In other words, these are the stocks that have departed the most from their average price on a daily basis in 2010. For long-term investors, these stocks may not be appropriate for a buy and hold, forget-about-it approach and may require more active monitoring. Traders may be more interested in the implied volatility of these stocks which are more forward looking, but many of these stocks are likely to remain in the volatility radar. The stocks are ranked from the least to the most volatile, according to data from Bloomberg.