Nasdaq Index: Memory Stocks Rally as Hormuz Risk Holds US Indices Back

• Micron, Sandisk, Western Digital, and Seagate gained over 2.5-5% after Washington blocked Apple from using Chinese memory chips amid existing supply shortages driven by AI data center demand
• WTI crude rose 0.5% to $83/barrel and Brent gained 0.6% to $89 as Iran threatened to escalate tensions in the Strait of Hormuz if U.S. diplomacy fails
• Nasdaq Composite edged up 0.16% to 26,770 while the Dow fell 0.33% and S&P 500 dropped 0.12%; upcoming FOMC minutes and retail earnings from Home Depot, Lowe's, and Walmart will test consumer strength

Market Summary: Memory Stocks Rally Amid Geopolitical Tensions

Key Developments

Memory chip stocks drove the Nasdaq Composite higher on August 17, 2026, while broader markets remained pressured by rising crude oil prices and geopolitical risks. The Nasdaq gained 0.16% to 26,770.916, while the Dow Jones fell 0.33% and the S&P 500 declined 0.12%.

Main Movers

Memory Sector Leaders:

• Sandisk surged 8.88%, leading the group
• Micron and Western Digital rose over 3%
• Seagate gained 2.5%
• Roundhill Memory ETF crossed above its 50-day moving average at $60.15

The rally was triggered by Commerce Secretary Howard Lutnick's directive to Apple against sourcing Chinese memory chips during an ongoing DRAM and NAND shortage, favoring domestic suppliers.

Other Tech Stocks:

Anthropic's Q2 revenue exceeded $11.5 billion, supporting broader semiconductor gains. Broadcom, Nvidia, Marvell, and Arm posted gains of 1.5-2%. Intel's CEO Lip-Bu Tan purchased over 105,000 shares.

Market Headwinds

WTI crude oil rose 0.5% to $83/barrel and Brent gained 0.6% to $89/barrel following Iranian threats to escalate tensions in the Strait of Hormuz if U.S. diplomacy fails. Higher oil prices raised renewed inflation concerns, limiting gains across non-tech sectors.

Upcoming Catalysts

• FOMC minutes release Wednesday
• Retail earnings: Home Depot (Tuesday), Lowe's (Wednesday), Walmart (Thursday)
• Consumer health assessment following last week's soft retail sales data

The memory sector's technical breakout contrasts with broader market consolidation below recent records, awaiting clarity on energy prices and monetary policy direction.