Memory Chip Stocks Rally on AI Optimism and Strong Tech Earnings

Memory chip stocks experienced a significant rally on Thursday, July 30, and into premarket trading on Friday, July 31, reversing a week of declines. This resurgence followed a period of investor concern regarding over-investment in artificial intelligence (AI). Companies such as Micron Technology (Nasdaq: MU) and SanDisk Corporation (Nasdaq: SNDK) saw substantial share price increases. Micron Technology closed Thursday up 18.36% and was up an additional 4.66% in premarket Friday, though its past month's performance showed a 24.23% decrease. SanDisk Corporation closed Thursday up 25.99% and gained 6.18% in premarket Friday, having fallen 43.71% over the past month. Other notable gainers included Western Digital Corporation (Nasdaq: WDC), which closed Thursday up 15.37% and was up 6.17% in premarket Friday, and Seagate Technology Holdings (Nasdaq: STX), up 11.41% on Thursday and 6.06% in premarket Friday. Despite these gains, the week's upturn was insufficient to offset the cumulative losses experienced over the preceding month for many of these companies. The primary catalyst for this turnaround was the release of strong earnings reports from major technology firms, including Microsoft, Amazon, and Lam Research, which were announced late Wednesday and throughout Thursday. These reports indicated robust performance in cloud computing services, thereby signaling continued high demand for memory chips. Specifically, Amazon Web Services (AWS) reported net sales growth of 37%, marking its fastest expansion since 2021. Microsoft's cloud computing division, Azure, surpassed $100 billion in revenue for the first time. Furthermore, Microsoft 365 Copilot achieved over 30 million paid subscriptions. These positive financial results from key cloud providers alleviated investor fears about a potential slowdown in AI-driven chip demand, suggesting that the infrastructure supporting AI development and deployment remains a strong growth area. The broader South Korean market, represented by the Kospi (Korea Composite Stock Price Index), also demonstrated a significant recovery, jumping nearly 18% on Friday, led by substantial gains in Samsung Electronics Co. (KSE: 005930.KS) and SK Hynix Inc. (KSE: 000660.KS), which rose 26.81% and 29.95% respectively on Friday. This broad market movement underscores a renewed confidence in the technology sector, particularly in companies supplying essential components for AI and cloud infrastructure.