AI Memory Stocks Rally After Nvidia Earnings: SanDisk, Micron and SK Hynix Rise — Which Stock Is Best to Buy?

Today's AI Memory Stocks Performance

Source: U.S. market close on August 31, 2026. SanDisk gained 5.50%, Micron rose 2.77%, SK Hynix increased 2.20%, Seagate slipped 0.17% and Western Digital fell 1.94%. The latest moves come as investors reassess AI infrastructure spending following Nvidia's strong earnings outlook and as the memory sector continues to benefit from tight supply and robust AI demand.

SanDisk was the strongest performer among the major storage names on August 31, gaining 5.50%. The move highlights continued investor interest in NAND flash and AI-related storage demand. SanDisk has become an increasingly direct way to gain exposure to the flash-storage side of the AI infrastructure buildout.

The broader NAND market is also attracting significant investment. Kioxia and SanDisk recently announced plans to invest more than US$31 billion in Japan by 2032 to expand flash-memory production, citing growing demand for high-capacity and energy-efficient storage driven by AI applications.

Micron and SK Hynix Extend Their Gains

Micron rose 2.77%, while SK Hynix gained 2.20%, keeping the HBM-focused memory trade firmly in focus.

The fundamental backdrop remains supportive. AI data centres require increasing quantities of HBM and high-performance DRAM, while major memory manufacturers are allocating more production capacity toward AI-related products. Recent industry commentary has also pointed to persistent memory shortages as AI infrastructure expands.

Nvidia's latest results have provided another important catalyst. The chipmaker's bullish long-term outlook and forecast for approximately 70% revenue growth in its next fiscal year reinforced expectations that AI infrastructure spending can remain strong, helping lift Micron and SK Hynix alongside the broader semiconductor sector.

Seagate and Western Digital Lag Behind

Not every storage stock participated in the latest rally.

Seagate slipped 0.17%, while Western Digital fell 1.94% on August 31. Western Digital's decline marked its third consecutive losing session, showing that investors are becoming more selective within the AI storage trade.

This divergence is important for investors. The AI memory theme is no longer a simple “buy the entire sector” trade. HBM leaders such as SK Hynix and Micron, NAND-focused SanDisk, and HDD-focused companies such as Seagate and Western Digital have different earnings drivers and different levels of exposure to the AI spending cycle.

What Does the Latest Move Mean for Australian CFD Traders?

The August 31 session suggests that AI memory stocks remain a major market theme, but momentum is becoming increasingly selective.

For Australian CFD traders, the key names to watch are:

• SanDisk: Higher-beta exposure to NAND and AI storage

• Micron: Diversified exposure to HBM, DRAM and NAND

• SK Hynix: Direct exposure to the HBM-driven AI memory cycle

• Seagate: Exposure to high-capacity HDD and AI data-centre storage

• Western Digital: Data-storage exposure with greater recent price volatility

The recent divergence also creates potential trading opportunities around earnings, AI-capex announcements, memory pricing and semiconductor-sector momentum. However, CFDs are leveraged products, so sharp moves in either direction can magnify both potential gains and losses.

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The AI memory trade has become more diversified in the second half of 2026. While HBM remains the strongest structural growth driver, investors can now choose between HBM/DRAM exposure through Micron and SK Hynix, NAND and enterprise SSD exposure through SanDisk, or AI data-storage exposure through Western Digital and Seagate.

The latest earnings and technology developments also suggest that the biggest opportunity may not necessarily be the stock that rises the most in a single session. Investors should consider AI exposure, memory pricing, product mix, earnings momentum and valuation when comparing these companies.

1. Micron (MU): Best All-Round AI Memory Stock

The company's latest results provide strong evidence that AI demand is translating into financial performance. Micron reported US$41.46 billion in fiscal Q3 2026 revenue, while its fiscal Q4 guidance called for approximately US$50 billion in revenue and around 86% gross margin. 

2. SK Hynix: Best HBM Growth Play

The company reported record second-quarter 2026 results, with revenue reaching KRW79.32 trillion and operating profit reaching KRW60.54 trillion. The company has attributed the strength of its business to the structural shift toward AI memory and continues to position HBM as a central growth engine. 

3. SanDisk: Higher-Beta NAND and AI Storage Play

SanDisk is investing in next-generation flash technology to address these workloads. In July, the company announced sampling of its BiCS10 1Tb TLC 3D NAND, featuring 332 layers, up to 4.8Gb/s NAND interface speed and a 59% improvement in bit density compared with BiCS8.

4. Western Digital and Seagate: Beneficiaries of AI Storage Growth

While HBM attracts most of the attention, AI data centres also require enormous amounts of storage. Western Digital and Seagate are benefiting from rising demand for enterprise SSDs and high-capacity nearline hard drives, making them attractive secondary plays on AI infrastructure expansion.

Investment Takeaway：If AI cloud spending remains robust, Micron appears to offer the most balanced investment opportunity thanks to its leadership across HBM, DRAM and NAND. SK Hynix remains the preferred choice for investors seeking direct exposure to the fast-growing HBM market, while SanDisk offers the greatest upside potential if the NAND recovery strengthens further. For investors looking beyond memory, AI infrastructure leaders such as AMD and TSMC also remain well positioned to benefit from the next phase of the AI investment cycle.

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The latest AI semiconductor rally is becoming broader — but memory stocks and AI chip stocks are not benefiting from exactly the same drivers.

AI chipmakers such as Nvidia, AMD and Broadcom are primarily benefiting from continued growth in AI accelerator demand, hyperscaler capital expenditure and the expansion of data-centre computing capacity. Memory companies such as Micron and SK Hynix, meanwhile, are benefiting from a second layer of the AI infrastructure boom: the rapidly increasing amount of HBM and DRAM required by next-generation AI accelerators.

The distinction has become more important following Nvidia's latest earnings. Nvidia delivered another record quarter and projected roughly 70% revenue growth for its next fiscal year, helping reassure investors that the AI infrastructure spending cycle remains intact. The results triggered a broad rally across AI-related stocks, including Micron and SK Hynix.

At the same time, Nvidia disclosed that its memory purchase commitments had increased from US$119 billion to US$279 billion, highlighting how critical memory supply has become to the next generation of AI systems.

The memory market is entering the second half of 2026 with an unusually tight supply-demand balance, driven by the rapid expansion of AI data centres.

High Bandwidth Memory (HBM): The Core AI Memory Growth Engine ⭐⭐⭐⭐⭐

HBM remains the biggest beneficiary of the AI infrastructure boom. NVIDIA, AMD and custom AI chip providers continue to increase HBM content per accelerator, while hyperscalers are locking in long-term supply agreements. Industry analysts expect HBM demand to remain supply-constrained through at least 2027, with HBM accounting for a growing share of total DRAM wafer capacity.

H2 2026 Outlook

• Strongest pricing power among all memory products

• Supply expected to remain tight

• AI server deployments continue to drive demand

• Positive for SK Hynix and Micron

DRAM: AI Demand Is Tightening the Broader Memory Market ⭐⭐⭐⭐⭐

Traditional DRAM is also benefiting from AI spending. As manufacturers dedicate more wafer capacity to HBM production, supply growth for DDR5 and server DRAM remains limited, helping support contract prices. Analysts expect DRAM pricing to strengthen further during the second half of 2026, with demand continuing to outpace supply.

H2 2026 Outlook

• Server DRAM demand remains robust

• DDR5 adoption continues to expand

• Prices likely to trend higher through year-end

• Positive for Micron, SK Hynix, and Samsung Electronics

NAND Flash: AI Storage Turns the Market More Bullish ⭐⭐⭐⭐☆

After several challenging years, the NAND market is finally showing signs of a healthier recovery. Enterprise SSD demand is improving as AI data centers require more high-capacity storage, while disciplined production cuts have reduced oversupply. Analysts expect NAND pricing and profitability to improve throughout H2 2026, although the recovery is likely to be more gradual than in HBM.

H2 2026 Outlook

• Enterprise SSD demand continues improving

• AI storage spending supports higher NAND consumption

• Consumer demand remains mixed

• Positive for SanDisk and Micron, with broader benefits for the enterprise-storage ecosystem

Australian investors don't necessarily need to purchase U.S. or Korean-listed shares directly to gain exposure to AI memory stocks. Another option is trading semiconductor CFDs, allowing traders to speculate on both rising and falling prices without owning the underlying shares.

Step 1: Open a Free Mitrade Account: Create a live or demo account in just a few minutes. Mitrade is ASIC-regulated and offers access to a wide range of global financial markets from a single platform.

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Step 2: Complete Account Verification: Verify your identity by uploading the required documents. Once approved, you'll be able to fund your account and start trading.

Step 3: Deposit Funds: Choose your preferred payment method and make your initial deposit. New traders can also practise risk-free using Mitrade's demo account before trading with real money.

Step 4: Search for AI memory stocks: Use the platform's search function to locate the SanDisk CFD instrument and review the latest market price, chart and trading conditions.

Step 5: Choose Buy or Sell: If you believe SanDisk will continue benefiting from AI demand, you can open a Buy (Long) position.

If you expect the share price to decline after earnings or profit-taking, you can instead open a Sell (Short) position.

Step 6: Manage Your Risk: Before placing your trade, set a stop-loss and take-profit level to help manage risk. Monitoring position size and using disciplined risk management are essential, particularly when trading leveraged products.

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