RIYADH: Saudi Arabia’s main stock index TASI started trading week higher on Sunday in line with rising oil prices, which recorded their sixth weekly gain last week amid concerns over tight supplies. TASI edged up by 0.66 percent to 12,259 points, and the parallel Nomu market was down 0.65 percent to 25,492 points. Bourses of Qatar, Oman, and Egypt were all down between 0.1 and