Bank stocks

The ratings agency said that it views rollbacks of stress-test comparisons and liquidity coverage ratio requirements as "negative" for banks with between $100 billion and $250 billion of assets.

A broad decline in bank stocks and investor concerns about specific companies are among the reasons for a spike in insider purchases.

Berkshire Hathaway plowed $13 billion into bank stocks in the third quarter that included new investments in JPMorgan and PNC and additional investments in Bank of America and Goldman Sachs.