DOHA: The collective net profit of companies listed on Qatar Exchange was marginally down in 2012 over the previous year. The total net profit of the companies was QR37.49bn last year as against QR37.91bn in 2011, down 1.1 percent, Al Sharq quoted Al Shall Capital as saying yesterday. The banking and financial sector performed well in 2012, and so did the service sector, but the industrial counters witnessed a drop of more than 16 percent in their profits, which negatively impacted the combined net profit of the listed entities last year.