The stock's engine rating is an assessment of its overall attractiveness. It combines valuation, risk-return trade-off, momentum, market capitalization and forecasted future returns. Only two percent of the stock universe receives the highest 5-engine rating. The lowest rating is a single engine. ValuEngine calculates our Engine Ratings once per trading day for about 4,000 US and 750 Canadian stocks in our universe. We update our ratings overnight in time for the market's opening the next day. In addition, rating upgrades and downgrades are also compiled each day.