RIYADH: Saudi Arabia’s main stock market crossed the 13,900-level for the first time in 16 years on Monday but gave up gains later in the day due to lower investor sentiment. TASI, as the main index is known, closed flat at 13,814 points, and the parallel market Nomu dropped 0.3 percent to 23,475 points. Elsewhere in the Gulf, stock exchanges of Abu Dhabi, Dubai, Qatar,