Saudi Arabia's stock market joined the soft rebound at GCC exchanges in Dubai and Kuwait. The Tadawul All Share Index (Tasi) gained 0.59%, closing at 6,001.38 points. Banks and financial services firms lifted the market in particular. Samba Financial Group jumped 3.37%, finishing at SR53.75. Standard and Poor's upgraded Samba's rating on Monday to 'A+' on strengthened financial profile and said the bank's outlook was stable.