AI Chip Stocks Soar: Sandisk Jumps 26%, Micron Surges 18% — Which AI Memory Stock Is Best to Buy?

Today's AI Memory Stocks Performance

Source: U.S. market close on July 30 (ET). The rally was fueled by renewed confidence in AI infrastructure spending, expectations of continued HBM demand, and optimism ahead of upcoming Big Tech earnings reports, which are expected to provide fresh signals on AI capital expenditure. 

For Australian CFD traders, the surge in memory stocks presents a timely opportunity to monitor one of the most dynamic themes in the global semiconductor market.

AI semiconductor stocks staged a powerful rebound on July 30, with memory chip makers and leading AI hardware companies posting double-digit gains after Microsoft's blockbuster earnings reignited confidence in the AI investment cycle. Investors who had been worried that hyperscalers might slow AI spending were reassured by Microsoft's stronger-than-expected cloud growth, improving cash flow and continued commitment to AI infrastructure.

1. Microsoft's Blowout Earnings Reignited AI Optimism

The biggest catalyst behind the rally was Microsoft's quarterly earnings report. The company delivered stronger-than-expected Azure cloud growth and reaffirmed that AI infrastructure investment remains a long-term priority. Management also projected healthy free cash flow through fiscal 2027, easing concerns that massive AI capital expenditures would pressure profitability. Microsoft shares surged more than 15%, adding roughly US$450 billion in market value in a single session and lifting the entire technology sector.

2. AI Infrastructure Spending Shows No Signs of Slowing

The latest earnings reinforced a key market theme: demand for AI infrastructure remains exceptionally strong. Cloud providers continue to invest heavily in GPUs, high-bandwidth memory (HBM), networking equipment and advanced semiconductor manufacturing to support next-generation AI models.

This optimism drove broad-based gains across the semiconductor sector:

• Micron (MU): +18%

• SanDisk (SNDK): +26%

• AMD (AMD): +13%

• TSMC (TSM): +7%

• Philadelphia Semiconductor Index (SOX): +8.2%

3. Memory Chips Remain the Biggest AI Bottleneck

Memory continues to be one of the most critical components of AI hardware. Every new generation of AI accelerators requires larger amounts of HBM, faster DRAM and higher-capacity enterprise storage.

Industry analysts expect supply to remain tight as AI server deployments continue to expand, supporting strong pricing for memory manufacturers. Companies with leading positions in HBM and enterprise storage are therefore expected to benefit disproportionately from the next phase of AI investment.

4. Investors Bought the Dip After a Sharp Sell-Off

Thursday's rally also reflected a strong technical rebound. Semiconductor stocks had experienced one of their weakest stretches of the year in recent sessions, leaving valuations more attractive. Microsoft's earnings acted as the catalyst for investors to rotate back into high-quality AI names, triggering aggressive buying across the semiconductor sector.

However, some analysts caution that while the rebound is encouraging, the semiconductor index has not yet confirmed a long-term trend reversal, and volatility may remain elevated as investors await additional earnings from major technology companies.

Open a Trading Account

      “Trade AI Chip Stock with an ASIC-regulated broker. Fast AUD funding via PayID. ”  

The latest rally highlights renewed confidence in the AI memory industry, but each company offers a different investment profile depending on its exposure to HBM, DRAM, NAND and enterprise storage.

1. Micron (MU): Best Overall AI Memory Stock

Micron remains one of the strongest plays on the AI memory cycle because it has meaningful exposure across all major memory technologies, including HBM, DRAM and NAND. Its latest earnings and guidance reinforced expectations that AI-related demand will continue to drive revenue and margin expansion. Following Microsoft's earnings, Micron shares surged 18%, reflecting growing investor confidence in sustained AI infrastructure spending.

2. SK Hynix: The HBM Leader

Although SK Hynix was not among the biggest U.S. gainers on July 30, it remains the industry's HBM leader. HBM is widely viewed as the most supply-constrained segment of the semiconductor market, and continued demand from AI accelerators positions SK Hynix to benefit from premium pricing well into 2027.

3. SanDisk: The Highest Upside in NAND

SanDisk posted the largest gain among major memory stocks, soaring 26% as investors bet on a sustained recovery in enterprise SSD demand and NAND pricing. Because the stock is more leveraged to NAND than its larger peers, it may offer greater upside if the storage recovery accelerates—but it is also likely to remain more volatile.

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.

Open a Trading Account

      “Trade AI Memory Stocks with an ASIC-regulated broker. Fast AUD funding via PayID. ”  

Although both memory stocks and AI chipmakers surged on July 30, the catalysts behind their gains are slightly different. AI chip companies such as AMD and TSMC are benefiting from expectations of continued demand for AI processors, while memory manufacturers are seeing additional support from tight HBM supply and improving DRAM and NAND pricing. Together, these trends point to a broad recovery across the AI semiconductor ecosystem rather than a rally driven by a single segment.

Following Microsoft's stronger-than-expected earnings, investors gained confidence that hyperscalers will continue investing aggressively in AI infrastructure. That benefits AI chipmakers by increasing demand for processors, while memory suppliers benefit because every AI accelerator requires significantly more HBM and high-performance DRAM than previous generations.

Another important difference is valuation. AI chip leaders have already delivered exceptional gains over the past two years, whereas many memory stocks had recently experienced a sharp correction. As concerns over slowing AI spending eased, investors rotated back into the memory sector, leading to outsized gains in companies such as Micron and SanDisk.

Overall, both groups stand to benefit if AI infrastructure spending continues to expand, but memory stocks may offer greater upside during periods of improving chip pricing, while AI chipmakers typically provide more consistent exposure to the long-term AI growth trend.

The AI memory industry is entering the second half of 2026 with one of its strongest supply-demand backdrops in years. While demand for AI accelerators continues to surge, memory manufacturers remain disciplined on capacity expansion, supporting higher prices across HBM, DRAM and NAND.

High Bandwidth Memory (HBM): Still the Fastest-Growing Segment ⭐⭐⭐⭐⭐

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 Servers Continue to Lift Pricing ⭐⭐⭐⭐☆

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: Recovery Is Gaining Momentum ⭐⭐⭐⭐☆

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, Western Digital, and Seagate

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.

Open a Trading Account

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.

👉 Ready to trade the AI semiconductor boom?

With Mitrade, investors can trade leading semiconductor companies through Contracts for Difference (CFDs), providing access to global markets from a single trading platform.

Start Trading in 3 Simple Steps

1

Open an Account

2

Fund Your Account

3

Trade AI Stocks

Open a Trading Account