TSX Falls as Oil Prices Slide Amid Iran Deal Expectations

Updated on May 28, 2026 • 5 min read

Canada’s main stock index closed lower Tuesday as investors adopted a cautious stance ahead of potential diplomatic developments between the United States and Iran.

The S&P/TSX Composite Index fell 177.02 points to close at 34,653.87, pressured mainly by weakness in the energy sector after crude oil prices dropped sharply.

Oil Prices Remain the Key Market Driver

Energy markets have dominated investor sentiment since the escalation of conflict between the United States, Israel and Iran earlier this year.

During the conflict, Iran restricted traffic through the Strait of Hormuz, one of the world’s most important oil shipping routes. The disruption created supply bottlenecks and triggered major volatility in global crude markets.

However, hopes of a potential diplomatic agreement between Washington and Tehran pushed oil prices lower Tuesday.

The July crude contract declined:

• US$2.71
• closing at US$93.89 per barrel

Because energy companies represent a large weighting within Canadian equity markets, falling oil prices directly pressured the TSX.

Canadian Energy Sector Faces Pressure

The Canadian stock market is particularly sensitive to oil price movements due to the dominance of:

• oil sands producers
• pipeline companies
• energy infrastructure firms
• natural resource exporters

Lower crude prices typically reduce revenue expectations for major Canadian energy names and weaken broader market sentiment.

At the same time, declining oil prices can ease global inflation concerns, creating a mixed economic picture for investors.

US Markets Diverged Higher on Tech Momentum

While Canadian equities weakened, US markets moved higher thanks to strong gains in technology and semiconductor stocks.

Major US Index Performance

• Dow Jones: -118.02 points
• S&P 500: +45.65 points
• Nasdaq Composite: +312.21 points

The Nasdaq significantly outperformed due to renewed enthusiasm around artificial intelligence and semiconductor demand.

Micron Technology Surges Above Trillion-Dollar Valuation

One of the biggest market movers was semiconductor company Micron Technology.

The stock jumped more than 20% after UBS dramatically raised its 12-month price target.

Key developments included:

• stock price surged above $900
• UBS target increased from $535 to $1,625
• market capitalization surpassed US$1 trillion

The rally reinforced investor optimism surrounding:

• AI infrastructure demand
• high-bandwidth memory growth
• data center expansion
• semiconductor supply chains

Space Stocks Rally Ahead of SpaceX IPO

Another major theme in US markets was renewed excitement surrounding the aerospace and space economy sector.

Investors are positioning ahead of the highly anticipated SpaceX IPO, expected within weeks.

Several space-related companies posted double-digit gains, including:

• Rocket Lab
• Redwire
• Virgin Galactic

The anticipated listing of SpaceX is expected to increase capital inflows into:

• commercial space technology
• satellite manufacturing
• launch systems
• defense-related aerospace suppliers

Canadian Banks Enter Earnings Season

Attention is also shifting toward Canada’s major banks as earnings season begins.

Canada’s “Big Six” banks are preparing to release results this week.

Analysts are not expecting major surprises, but valuation concerns are increasing.

Key Concern: Price-to-Book Ratios

Price-to-book value compares:

• market capitalization
• shareholder equity / net asset value

Many Canadian bank stocks are now trading near historically elevated price-to-book multiples, suggesting limited upside unless earnings growth accelerates further.

Canadian Dollar and Gold Prices

Additional market data showed:

Canadian Dollar

• CAD traded at 72.40 US cents
• slightly lower than Monday’s 72.44 US cents

Gold Prices

• June gold contract fell US$20.90
• closing at US$4,502.30 per ounce

Gold prices weakened as investors rotated toward higher-risk growth sectors including technology and aerospace.

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Editorial Perspective

The market reaction highlights how geopolitics, energy and technology are now tightly interconnected.

For Canada, oil remains one of the largest macroeconomic drivers. Any diplomatic movement involving Iran immediately impacts:

• crude pricing
• TSX performance
• inflation expectations
• currency stability

Meanwhile, the US market continues shifting toward AI, semiconductors and space-related growth themes.

The contrast between resource-heavy Canadian markets and technology-driven US indexes is becoming increasingly visible in 2026.

If oil prices stabilize while AI and aerospace capital flows continue accelerating, North American equity markets may remain highly divided between traditional resource sectors and next-generation industrial technologies.