Saudi Stock Exchange's main index ended trading lower today, losing 18.87 points to close at 9,645.74 points. The total value of the trading reported was 15 billion, while the toll of shares traded was more than 508 million, divided into over 556,000 deals. The Saudi Parallel Equity Market Index (NOMU) ended the day losing 162.62 points, to close at 23,620.69 points, with a valuation of more than SR28 million and an overall tally of 295,000 stocks traded and divided into as many as 1,044 deals.