RIYADH: Saudi Arabian stocks capped last week with gains, following a mixed performance throughout the week as cautious earnings optimism took over. TASI index surged 0.52 percent to end at 12,268 on Thursday. This came after it posted two straight days of losses and increased 0.73 percent on the week. The parallel market, Nomu, slipped by 0.45 percent to 25,217 points.