Big investment banks Morgan Stanley (MS), JPMorgan (JPM) and Goldman Sachs (GS) are facing weakening revenues and a confluence of negative factors that are making the firms' outlooks turn bleak.

First, insiders revealed that Goldman Sachs cut 50 top-level positions last week as revenue prospects declined. Morgan Stanley saw its stock hit the lowest level in four years over the past four days and JPMorgan is still railing from a multibillion-dollar loss on a trade.

Click here to watch Bloomberg's coverage of the big bank's woes.