Investopediaยท2025-11-18 23:01Core Insights - Concerns regarding the profitability of AI investments have negatively impacted tech shares, particularly those of Amazon and Microsoft, which have been downgraded to neutral from buy by Rothschild & Co Redburn [2][3][7] Company Analysis - Rothschild & Co Redburn's analyst, Alex Haissl, stated that there is no longer a bullish case for Amazon and Microsoft, leading to a decline in their stock prices by 2.7% and 4.4% respectively [2][4] - The report indicates that generative AI development costs are significantly higher than the revenue it generates, with capital intensity nearly three times that of early cloud computing [5][6] - Amazon's AWS is viewed as better positioned than Microsoft's Azure for capturing value, but both companies need to demonstrate sustained higher growth and reduced build costs to regain a positive outlook [6][8] Industry Context - The AI rally that previously drove market indexes to record highs is losing momentum due to concerns about valuations and comparisons to the dotcom bubble [3][4] - The market is currently pricing in unrealistic returns based on outdated expectations of cloud economics, which are no longer achievable according to the analyst [6][7]