With Saudi Arabia being a predominantly oil-based economy, major changes in the price of oil are likely to be followed by sentimental as well as real changes in the stock market. When a major downward movement in international oil prices occurs, this will usually be accompanied by an immediate/short-term impact on the stock market, as a result of change in sentiment. While sentimental changes often impact the stock market immediately, real changes will take effect over the longer term. If oil prices remain low, this ultimately affects economic policy framework, private sector activity and corporate profitability. The attached report examines the nature of the Tadawul All Share Indexs (TASIs) relationship with global oil prices.