The fourth-quarter earnings outlook for big banks remains fairly upbeat, even as reports about trading losses at some banks and brokerages continue to mount.

Goldman, Sachs & Co. on Monday became the latest firm to attribute a sluggish fourth-quarter performance to losses at its proprietary trading desk. The news followed reports about expected fourth-quarter losses in the bond portfolio at Salomon Smith Barney, a unit of Citigroup, and in J.P. Morgan & Co.'s proprietary businesses, including trading.

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