Microsoft shares dropped below the $400 threshold as investors weighed the high costs of artificial intelligence. The company committed approximately $50 billion to infrastructure expansion. This aggressive spending triggered rising costs and early signs of margin compression.

Reports of a potential cloud agreement between Amazon and OpenAI threaten Microsoft’s primary strategic partnership. This deal could challenge Azure’s dominance in AI workloads. The development introduces new strategic and legal risks for Microsoft’s cornerstone investment in OpenAI.

Strong earnings failed to offset market worries regarding long-term profit sustainability. Investors remain anxious about the massive expenditures required to maintain AI leadership.