Investor confidence in Amazon.com Inc. is surging, driven by the strong performance of its cloud-computing division, Amazon Web Services (AWS). Recent earnings results, which showed the fastest quarterly growth for AWS since 2022, combined with a major cloud deal with OpenAI, have alleviated fears that the unit was losing momentum to rivals. This renewed optimism has propelled a significant rally in Amazon's stock. The positive developments have added approximately $300 billion to Amazon's market value over just four trading days, pushing the stock to a new record. Investors who were previously concerned about slowing growth in the critical AWS division are now viewing Amazon as a potential leader in the artificial intelligence space. The combination of strong results and the OpenAI deal suggests that the accelerated growth in AWS could be sustainable. Analysts note that AWS has long been crucial to Amazon's stock performance due to its high profitability compared to the retail business. With the improved outlook for its cloud division, some market watchers believe Amazon's stock could be poised for a material re-rating, suggesting significant upside potential from its current valuation.