Why Micron Stock Exploded 40% Higher in September

Core Insights - Micron is experiencing significant growth due to the rising demand for AI infrastructure, with its stock gaining 40.6% in September [1] - The company sold $2 billion worth of high-bandwidth memory (HBM) chips in Q4 fiscal 2025 and is preparing to launch next-generation HBM4 chips [3] - Micron's revenue increased by 46% year over year in Q4 to $11.3 billion, with a non-GAAP gross margin of 45.7% [5] Demand for AI Infrastructure - The demand for high-bandwidth memory is surging, driven by major deals with tech giants like OpenAI and Nvidia for AI data centers [2] - Micron is prioritizing HBM production over standard DRAM chips, despite weak demand in the PC and smartphone markets [4] Financial Performance - Micron's revenue for Q4 fiscal 2025 reached $11.3 billion, with adjusted earnings per share more than doubling [5] - The company anticipates generating around $12.5 billion in revenue in Q1 fiscal 2026, with a projected non-GAAP gross margin of approximately 51.5% [5] Market Dynamics - The memory chip market is cyclical, with pricing influenced by supply and demand dynamics [7] - Historical trends indicate that periods of high demand are often followed by downturns, posing risks to Micron's profitability [7][8]