Sandisk and Dell Lead S&P 500 AI Gainers over 100%
Fifteen S&P 500 firms, including Sandisk and Dell, have doubled in value this year on AI infrastructure demand.
Key points
- Sandisk leads S&P 500 AI gains with a 584.69% rise through August 2026.
- Energy firms Marathon Petroleum and Valero gained over 110% on data center power demand.
- Nvidia missed the 100% gain list with an 18% rise, showing broadened market participation.
A recent analysis by Yahoo Finance identified fifteen S&P 500 companies that have increased in value by at least 100 percent through August 2026. The rally is driven by expanding capital expenditure on artificial intelligence infrastructure, extending well beyond traditional chipmakers to include hardware, storage, and energy providers.
Sandisk leads the group with a 584.69 percent gain, followed by Dell Technologies at 272.53 percent and Micron Technology at 228.48 percent. Notably, Nvidia, the sector’s most visible beneficiary, was not included in this specific list, having risen only 18 percent over the same period, suggesting the market’s focus has broadened to the wider supply chain.
Infrastructure Suppliers Drive Broad Gains
The top performers are heavily concentrated in the physical components required for data centers. Memory and storage manufacturers such as Seagate Technology (228.14 percent) and Western Digital (190.33 percent) show strong demand for high-capacity solutions. Server builders like Hewlett Packard Enterprise (132.26 percent) and networking specialists like Marvell Technology (151.87 percent) are also capitalizing on the hardware buildout.
Energy providers are emerging as critical beneficiaries of the AI buildout. Marathon Petroleum (124.55 percent) and Valero Energy (114.54 percent) have seen significant value increases as data centers require substantial power supplies. This shift indicates that the AI investment cycle is impacting utility and energy sectors alongside traditional technology firms.
Corporate Spending Remains Robust
Fidelity portfolio manager Bill Bower noted that corporate spending on AI infrastructure remains strong, with particular focus on semiconductors, memory, and power infrastructure. While the technology does not appear to be in a bubble, investors face the risk that market expectations may outpace actual profit realization.
The current rally reflects a mature phase of the AI cycle where demand is distributed across multiple layers of the technology stack. Companies that provide tangible infrastructure are seeing sustained revenue growth, supporting the valuation increases observed in the second half of 2026.
