The U.S. stock storage sector (primarily focusing on semiconductor storage chips such as DRAM, NAND Flash, high-bandwidth memory HBM, and enterprise storage solutions) is a core beneficiary of the explosive growth in AI data centers. Currently, the main listed companies are as follows, categorized by sub-sector for clarity:

1. Core Players in DRAM & HBM (High-Bandwidth Memory)

Micron Technology (MU) - NASDAQ
The world's third-largest DRAM manufacturer and leader in HBM, the only domestic DRAM manufacturer in the U.S. Market demand for HBM has surged due to AI servers, with Micron being a major supplier of NVIDIA’s HBM3E. Its stock has more than doubled by 2025.

Electronics (SSNLF) - OTC (Pink Sheets)
Holding approximately 43% of the global DRAM market share, also a leading player in HBM. Although not strictly listed on U.S. exchanges, it has good liquidity and is often held by U.S. investors.

2. Core Players in NAND Flash & Enterprise SSD

Western Digital (WDC) - NASDAQ
Through SanDisk, it became the third-largest NAND manufacturer globally, focusing on enterprise eSSD and high-capacity HDD + SSD hybrid storage. Its stock surged over 130% in 2025, making it a top choice for large-capacity storage in AI data centers.

Seagate Technology (STX) - NASDAQ
A traditional HDD giant, recently launched 30TB+ ultra-large capacity enterprise drives. Massive cold storage is essential for AI training, and its stock experienced a similarly impressive rise in 2025.

3. Enterprise All-Flash & Software-Defined Storage

Pure Storage (PSTG) - NYSE
A leader in all-flash arrays, with a subscription model and high margins, making it highly attractive to enterprise clients in the AI era. Institutional investors are optimistic, and its stock has shown steady growth in 2025.

NetApp (NTAP) - NASDAQ
An established hybrid cloud storage provider, with ONTAP systems supporting AI workloads. Gross margins exceed 70%, and cash flow is very strong.

4. Other Related Areas (Interface Chips / Memory Modules)

Rambus (RMBS) - NASDAQ
Provides GDDR/HBM interface IP, essential for AI graphics cards. Its stock is expected to rise in tandem with storage prices in 2025.

Current Market Consensus (as of November 2025): Storage cycles have entered a super-uptrend phase. NAND and DRAM contract prices have risen for six consecutive quarters, with supply expected to remain tight through 2026.
AI is the biggest driver: a single 8-GPU cluster requires over 1TB of HBM and hundreds of TBs of enterprise SSD.

Recommended Portfolio: MU (pure HBM beneficiary) + WDC (highest cost-performance ratio) + PSTG (enterprise subscription with high certainty).