RIYADH: Saudi stocks finished flat on Monday after declining a day earlier, as investor sentiment was dragged down by a weakening global economic outlook. TASI, the main benchmark index, ended the session at 12,560, while the parallel market Nomu added 0.3 percent to 21,724. Gulf markets were mixed on Monday, with the Qatari index slipping 1.2 percent, Abu Dhabi and Dubai down