Micron (MU) Q4 2025 earnings review
AI Supercycle Ignites Record Quarter, Fueling Powerful 2026 Outlook
Micron closed a record-breaking fiscal year with an exceptional Q4 performance, delivering revenue of $11.3B and Non-GAAP EPS of $3.03, both significantly beating prior guidance. The results were driven by explosive, AI-fueled demand for its high-bandwidth memory (HBM) and broader data center portfolio, which now accounts for over 54% of revenue. Gross margins expanded dramatically to 45.7%, and guidance for Q1 2026 points to continued acceleration, with revenue forecast to reach a new record of $12.5B and gross margins expected to cross the 50% threshold. The narrative is clear: Micron is a primary beneficiary of the AI infrastructure buildout, with tight supply and technology leadership creating a powerful earnings cycle.
🐂 Bull Case
The HBM business is a key growth engine, reaching a nearly $8 billion annualized run-rate in Q4. With supply for calendar 2026 already being negotiated and a technology lead in next-generation HBM4, Micron is capturing premium pricing in the most critical segment of the AI buildout.
Growth extends beyond HBM. Strong demand for data center SSDs and high-capacity server DRAM helped drive the Data Center business to 54% of total revenue with blended gross margins over 50%, cementing its role as the company's primary profit driver.
Guidance for FQ1 projects another record quarter with revenue of $12.5B and gross margins expanding by nearly 600 basis points to 51.5%, indicating the earnings upcycle is still in its early stages.
🐻 Bear Case
The NAND business remains a weak spot, with Q4 revenue declining 5% YoY while DRAM revenue surged 69% YoY. While the company is pivoting to higher-value products, the segment continues to drag on overall growth.
Fiscal 2026 CapEx is guided to be higher than FY25's $13.8 billion, a massive investment that carries significant execution risk and requires sustained market strength to generate adequate returns.
⚖️ Verdict: 🟢🟢
Very Bullish. The company is executing flawlessly into the epicenter of the AI supercycle. The combination of technology leadership in HBM, disciplined supply management creating pricing power across the portfolio, and a powerful forward-looking guidance makes a compelling case. The lagging NAND segment is a manageable concern overshadowed by the sheer force of the AI-driven data center demand.
Key Themes
HBM is the Primary Growth and Profitability Engine
Micron's leadership in High-Bandwidth Memory (HBM) is the core of its success. Q4 HBM revenue grew to nearly $2 billion, driven by the ramp of its industry-leading HBM3E products. Management noted that HBM market share is on track to align with its overall DRAM share. With pricing agreements for the vast majority of its calendar 2026 HBM3E supply already in place and next-generation HBM4 samples shipped to customers, Micron is solidifying its position in a market that is structurally undersupplied.
AI Demand Lifts Entire Data Center Portfolio
The AI tailwind extends well beyond HBM. The combined Data Center business (Cloud Memory and Core Data Center units) now represents 54% of total revenue. The Cloud Memory unit, which includes HBM, posted a staggering 59% gross margin. Traditional server demand is also strengthening, driven by AI agent workloads, benefiting Micron's high-capacity DIMMs and data center SSDs. This broad strength indicates a durable and multi-faceted growth driver.
NAND Segment Remains a Clear Laggard
While the DRAM business is booming, the NAND segment's performance stands in stark contrast. Q4 NAND revenue declined 5% year-over-year, while DRAM revenue surged 69%. To address this, Micron is strategically exiting the mobile managed NAND market to focus on higher-ROI data center opportunities. However, the segment remains a drag on overall growth and profitability compared to the high-flying DRAM business.
Supply Discipline and Pricing Power
Micron is benefiting from a tight supply environment, partly of its own making. The company's DRAM inventory is below target levels, and management intends to keep bit supply growth below demand growth. This discipline, combined with HBM production consuming a disproportionate amount of leading-edge wafer supply, has created a constructive pricing environment. DRAM prices increased in the low double-digit percentage range sequentially in Q4.
AI Driving Broad Market Upgrades
Management's market outlook is increasingly positive, driven by AI's influence beyond the data center. The forecast for calendar 2025 PC unit growth was raised from low-single-digits to mid-single-digits, citing AI PCs. The total server unit forecast was also raised from mid-single-digits to approximately 10% growth. This suggests the AI demand cycle is broadening and becoming more resilient.
Massive Capital Investment Increases Future Risk
Micron invested $13.8 billion in CapEx in FY25 and guided for a higher amount in FY26. While necessary to fund HBM capacity and future fabs, this level of spending introduces significant execution risk and raises the stakes for the market to remain strong. Any future downturn would be more painful given the elevated capital intensity.
Other KPIs
Stable. Micron generated positive free cash flow for the full year, a significant achievement given the record $13.8 billion in net capital expenditures. This demonstrates the immense cash-generating power of the core business, which is funding the company's aggressive investments in future AI-driven growth.
Decelerating. Inventory declined sequentially and year-over-year, even as revenue grew 46% YoY. Days of inventory fell to 124, down 15 days from the prior quarter. Management noted that DRAM inventory is below target levels, signaling a very tight supply environment that supports continued pricing strength.
Guidance
Accelerating. The midpoint implies 10.5% sequential growth and 43.5% YoY growth. This represents a fifth consecutive quarter of strong YoY growth acceleration and points to powerful market momentum heading into calendar 2026.
Accelerating. The guided 580 basis point sequential expansion is a clear signal of significant pricing power and favorable product mix, driven by high-margin data center products. Breaking the 50% barrier is a major milestone in the current upcycle.
Accelerating. The midpoint guidance implies a 110% YoY increase, demonstrating the powerful operating leverage in the business model as revenue scales and margins expand.