Memory chip index surges 159% in Q2 as AI enablers lead rally

Memory chip and hardware supply chain stocks delivered the best quarterly performance in history as AI infrastructure spending cascaded beyond Nvidia.

The US memory chip and hardware supply chain index surged 159% in the second quarter, more than quadrupling from 69.59 points at the start of the year to 277.74 points, as investors rotated from AI hyperscalers into semiconductor enablers.

"The rotation out of AI hyperscalers into AI enablers has shifted investors' euphoria into semis, driving spectacular rallies," Barclays analyst Anshul Gupta said in a note.

The index closed at 268.03 on June 30, up 3.83% on the day, capping a June gain of 27.26%. Among the best performers, Micron Technology rose 304% in the first half of 2026, while Intel gained 278% and Advanced Micro Devices added 171%, according to LSEG data. Sandisk, spun off from Western Digital in February 2025, led the S&P 500 with an 858% surge.

The rally reflects a fundamental shift in AI spending patterns: as hyperscalers like Amazon, Alphabet, Meta and Microsoft pour capital into data centers, the companies supplying memory, storage and networking gear are capturing an increasing share of that investment. The VanEck Semiconductor ETF rose 71% in the second quarter, its best quarterly performance since inception in 2000.

Memory Makers Lead the Charge

Micron, one of three major producers of computer memory, saw its market value swell by roughly $920 billion in the second quarter alone. The company reported last week that revenue in the latest quarter more than quadrupled from a year earlier, driven by skyrocketing memory prices from AI chip demand. Its gross margin jumped to 84.9% from 39% a year earlier. Micron CEO Sanjay Mehrotra announced new customer agreements that he expected would "significantly enhance the durability and predictability" of the company's financial performance, according to a company statement.

Intel, the legacy maker of central processing units, added $480 billion in market cap during the second quarter as its stock jumped 216%. The company is building US chip factories while benefiting from renewed demand for CPUs as more AI workloads move to devices. AMD, Intel's rival in both CPUs and graphics processing units, added $615 billion in value after its stock nearly tripled.

Beyond Chips — The Infrastructure Boom Spreads

The rally extended well beyond memory and processor makers. Marvell Technology, which makes networking gear for data centers, climbed about 200% in the second quarter. Arm, which supplies chip designs to other semiconductor companies, rose 134%. Seagate Technology and Western Digital, the dominant players in data storage, gained 250% and 271% respectively in the first half, according to LSEG.

Dell Technologies, a major supplier of AI servers, rose 243% in the first six months of 2026. Applied Materials and Lam Research, which manufacture the equipment used to produce chips, gained 181% and 153% respectively.

The breadth of the rally suggests the AI infrastructure buildout is entering a new phase. While Nvidia remains the dominant AI chipmaker, its stock gained only 15% in the second quarter — a fraction of the returns delivered by the companies supplying the ecosystem around it.

For investors, the question is whether valuations can sustain the pace. Micron trades at 8.1 times forward earnings, the lowest forward P/E among the top 20 S&P 500 performers this year, reflecting lingering concern over the cyclical nature of the memory business. Sandisk's forward P/E has actually declined to 12 times despite its 858% gain, as earnings estimates have risen even faster than the stock price. Jefferies analyst Blayne Curtis raised his price target on Sandisk to $3,000 on Friday, implying 32% upside from its closing price of $2,273.73.

This article is for informational purposes only and does not constitute investment advice.