JPMorgan Chase & Co., the biggest U.S. lender by assets, will have “essentially flat” investment bank revenue this quarter excluding accounting adjustments, according to CEO Jamie Dimon, who spoke at a Goldman Sachs conference.  The assessment is in comparison to this year’s Q3 results - that period experienced the worst for trading and investment-banking revenue at the biggest Wall Street firms since the financial crisis in 2008. Dimon’s remarks in a presentation today show U.S. investment banks still face pressure as corporations delay raising capital and investors sell riskier assets amid concern that the U.S. economy is weakening and Europe’s debt crisis may spread.  Dimon added that JPMorgan’s private-equity unit also expects to post a “modest loss” for Q4 of 2011. Investment Bank Numbers. JPM investment banking generated about $4.5bn in Q3 revenue, net of a $1.9bn gain in debt-valuation adjustments.  Dimon excluded that accounting effect in forecasting the unit’s revenue.  Revenue at the investment-banking unit slid this year from $8.2bn in Q1, as concerns recently mounted that Greece would default and U.S. lawmakers would fail to raise the debt ceiling.  However, Dimon sees promise in the long-term prospects for the investment banking unit. As for JPMorgan Chase & Co. Overall, Mr. Dimon remained bullish on the bank's ability to thrive, even among the gloomiest predictions.  He said the upcoming stress tests from the Federal Reserve, which are testing how banks would react in severe downturns, will show most U.S. banks are already holding more capital than is needed to easily get by. He said even if the extreme scenarios - which include an unemployment rate of 13% -lasted a full year, JPMorgan would still make money throughout. Accordingly, Jamie Dimon would expect a "modest" dividend increase and "healthy" share buybacks for JPMorgan after the stress test.  The bank has $950mn in equity that can be used to repurchase - on top of the $8bn the Fed had already allowed.   [Bloomberg, 12/7/11]