the chief operating officer of goldman sachs group inc gs warned thursday that the investment bank is expecting a 25 slump in trading revenue for the secondquarter in what he called a “pretty difficult” environment for banks according to media reports john waldron made the comment at a conference in new york at which he said goldman expects to cut about 250 jobs in what will be a third round of layoffs the bank laid off 3200 workers in january after cutting a few hundred in september it had about 45000 employees as of march 31 investment banks are currently struggling with a drought in dealmaking and equity