Goldman Sachs finally revealed how much money it makes from proprietary trading.

In an 8-K filing, the bank showed the results of the first three quarters of 2010 under new disclosure standards.


Among other clarifications, it -- for the first time ever --  put out hard data on its mega-lucrative prop trading operations. 


For these three quarters, revenues from prop trading were $5.5 billion, or 18 percent of overall revenues.


Pre-tax earnings were $2.7 billion, or 30 percent of overall earnings.


Previously, the figure Goldman Sachs executives orally gave for how much prop trading contributes was 10 percent of overall revenues.


But as experts long suspected, proprietary trading accounts for much more than that.


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