Micron surges 240% in Q2 as AI memory demand outpaces supply

In its Q2 2026 investor letter, the Janus Henderson Global Sustainable Equity Fund highlighted Micron Technology as a key contributor to performance. Micron is a leading semiconductor company that manufactures memory and storage products for a wide range of applications. The fund stated that Micron was among the largest positive contributors to returns alongside Seagate and TSMC, with shares returning more than 240% in the quarter after the company released results that reinforced the growing strategic importance of memory to AI infrastructure buildout.

Micron was added to the fund's portfolio toward the end of 2025, positioning the fund to benefit from the acceleration. The company's Q2 results showed stronger pricing, improving demand, and a more constructive outlook. Critically, demand for memory continues to outpace industry supply additions—a structural advantage. Growth is being driven by high-bandwidth memory for AI accelerators, agentic workloads, and data caching. Micron's latest energy-efficient memory products allow AI workloads to run with higher performance and lower power consumption, addressing a key operational constraint for data centers. Long-term customer agreements may improve earnings visibility and reduce cyclicality, a meaningful change for a sector historically prone to boom-bust cycles.

On July 15, 2026, Micron closed at $904.28 per share with a market capitalization of $1.02 trillion（約160兆円）. While the one-month return was -22.62%, shares had gained 674.70% over the past 52 weeks, underscoring the magnitude of the move driven by AI infrastructure demand. The company's positioning as a critical supplier of memory for AI accelerators, combined with pricing discipline and long-term customer commitments, has transformed it into a cornerstone holding for investors betting on sustained AI infrastructure spending.

Micron Technology's 240% surge in Q2 2026 reflects a fundamental shift in the semiconductor market: memory has become central to AI infrastructure expansion. The company was added to the Janus Henderson Global Sustainable Equity Fund's portfolio toward the end of 2025, positioning the fund to capture gains as demand accelerated. The results showed that memory demand is outpacing industry supply additions, a structural imbalance that supports pricing power and margins.

The growth drivers are specific to AI workloads. High-bandwidth memory for AI accelerators, agentic workloads (autonomous AI systems), and data caching are the primary applications fueling demand. Micron's energy-efficient memory products—which allow AI systems to run at higher performance with lower power consumption—address a critical pain point for data center operators managing thermal and energy costs. Long-term customer agreements represent an additional stabilizer, improving earnings visibility and reducing the cyclicality that has historically plagued semiconductor manufacturers. Together, these factors suggest Micron has moved from a cyclical commodity chip maker to a strategic infrastructure provider for the AI era.

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