Goldman Sachs Groups and Morgan Stanley have earned billions in profits utilizing fixed income trade procedures over past year or so, but this engine of profits may be stalling in the 2nd quarter as turbulence comes to bond markets.

Earnings estimates for these two investment banking firms have been slashed by analysts recently, due to misgivings regarding fixed income trades, and also merger advisory revenues and stock trades. The two banking firms are due to give reports of their results at the end of this month.