NEW YORK ( TheStreet) -- Citigroup ( C) and Bank of America ( BAC) would likely see the biggest share price boost among the largest five U.S. securities dealers if Greece works out a deal with creditors to avoid a default, according to a research report published Monday. Wells Fargo analyst Matt Burnell believes Bank of America and Citigroup would benefit the most from a deal over Greek sovereign debt because they trade at relatively lower valuations to JPMorgan Chase ( JPM), Morgan Stanley ( MS) and Goldman Sachs ( GS), according to his report. Burnell argues that positive news related to Greece's discussions with creditors were responsible for boosting the banks' shares last week. Burnell does not specify how much of a pop he thinks the shares would get from a resolution over Greece. Of the group, Bank of America has been the biggest gainer year to date--up 27.25% as of mid-Monday morning. Morgan Stanley and Goldman were both up 21% over the same time frame, while Citigroup shares have risen 15.32% and JPMorgan shares have seen a 10.14% rise. However, Burnell sees risks ahead for Bank of America, JPMorgan and SunTrust Banks ( STI) due to "gathering momentum" for an investigation by federal and state authorities into underwriting of mortgage backed securities. Bank of America, JPMorgan and SunTrust all saw a rise in claims by mortgage bond investors seeking to get the banks to buy back mortgage securities they underwrote during the housing boom. Burnell has a "market perform" rating on all the abovementioned banks, except for JPMorgan, which he rates "outperform." -- Written by Dan Freed in New York. Follow this writer on Twitter.