Big banks have rallied since Donald Trump's election, and their profits look promising too, thank to a bit jump in total trading revenue.

Morgan Stanley  (MS)  probably had the biggest jump in total trading revenue, with a gain of 23%, according to an analyst at Deutsche Bank. JPMorgan Chase  (JPM)  and Citigroup (C)  likely will report a 21% increase in trading volume, followed by Bank of America (BAC)  and Goldman Sachs  (GS) .

Prospects look bright for this year too. A Morgan Stanley analyst says lower taxes and less regulation could "set the stage for the bull case."

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