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Bank investors are getting very nervous

Investors get nervous about banks

Traders appear to be getting increasingly concerned about the bank stocks.

Bank shares' implied volatility, which measures the magnitude of moves expected in the weeks ahead, has risen precipitously in the month of February.

"There's a great deal of nervousness out there," Dennis Davitt of Harvest Volatility Advisors said in a Tuesday "Trading Nation" segment.

While options prices have also been rising for the market as a whole, the increasing concern around the banks has been notable. As the below chart from Rareview Macro strategist Neil Azous shows, the implied volatility of Bank of America shares has risen precipitously compared to the implied volatility of the S&P 500 (as commonly measured with the VIX).

Here is the same chart again, but with the two lines combined into a single ratio:

Of course, the nervousness extends beyond American banks. Perceived weakness in European financials such as Deutsche Bank appears to have become on of the market's biggest preoccupations.

"If we had to pick one theme to hone in on over the past 24 hours it would be how pronounced the weakness has become in the banks in all corners of the earth," Azous wrote in a Tuesday missive.

The S&P 500 bank industry group has gotten hit very hard in the first weeks of 2016, falling more than 18 percent.

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