Despite of recovering during the last hours of trading, the Qatar Exchange (QE) failed to end in the green and closed 0.44% lower at 6,773.47 points. Doha Insurance hit the bottom of the charts by losing 3.20% and closing at QR27.00. Qatar Steel Company, a subsidiary of Industries Qatar (down 1.44% at QR97.00) announced today, that it will upgrade its production capacity by 30% with the support wof Germany's technology group Siemens. Qatar National Bank (QNB) topped the charts and advanced by 2.67% to QR137.00.